Piston pump
HENGYUHANG Axial Piston Variable Displacement Pump HYH7VK Series 10
Engineered with a robust bent-axis axial tapered piston rotary group and dual specialized shaft sealing with barrier fluid monitoring, the HENGYUHANG HYH7VK Series 10 variable displacement metering pump delivers high-precision, pulse-free volumetric dosing for polyurethane components (polyol and isocyanate) at a nominal continuous working pressure of 250 bar and maximum peak pressure of 315 bar (4,550 psi / 31.5 MPa).
| Applications
Designed specifically for polyurethane processing machinery, high-pressure reaction injection molding (RIM) plants, continuous slabstock and sandwich panel foaming lines, automated adhesive and sealant dispensing systems, and chemical dosing skids, this specialized bent-axis variable pump features ISO 3019-2 4-bolt mounting flanges, DIN 6885 keyed drive shafts, and manual handwheel adjustment (MA) with an integrated precision optical position scale, delivering 1:1 OEM drop-in interchangeability for Bosch Rexroth A7VK Series 10 (A7VKO open design) and direct replacement for legacy A2VK series installations.
| Key Technical Specifications
Product Model: Hengyuhang Axial Piston Variable Displacement Pump HYH7VK Series 10 (HYH7VKO Open Design)
Brand Replacement: Bosch Rexroth A7VK Series 10 (Sizes 12, 28, 55, 107; A7VKO open design) OEM or as requested.
Displacement: 4 standardized displacement sizes (Size 12: 11.6 cm³/rev, Size 28: 28.1 cm³/rev, Size 55: 54.8 cm³/rev, Size 107: 107.0 cm³/rev; infinitely adjustable down to 0 cm³/rev)
Rotation Direction: Clockwise (R, standard), counter-clockwise (L, option) (viewed from drive shaft end)
Speed Range: Rated for standard electric motor operating speeds of 1,500 r/min and 1,800 r/min (duty-cycle reference points delivering up to 160.5 L/min and 192.6 L/min nominal flow)
Peak Pressure: Nominal continuous working pressure 250 bar (3,600 psi); Maximum peak operating pressure 315 bar (4,550 psi / 31.5 MPa)
- Description
- Tecspecs
- Brand & Reference
- Download HENGYUHANG Polyurethane Metering Pump HYHY7VK Axial piston variable pump PDF
- Send an Inquiry
| Overview of HENGYUHANG HYH7VK Series 10
The HENGYUHANG HYH7VK Series 10 is a heavy-duty, high-precision axial piston variable displacement pump built with a bent-axis rotary group, engineered specifically for pumping, metering, and mixing chemically aggressive and viscous polyurethane components, including polyols and isocyanates (MDI/TDI). Manufactured across four standardized frame sizes—Size 12 (11.6 cm³/rev), Size 28 (28.1 cm³/rev), Size 55 (54.8 cm³/rev), and Size 107 (107.0 cm³/rev)—the pump provides stepless displacement adjustment from maximum stroke down to zero volume (Vg min = 0), enabling operators to fine-tune stoichiometric mixing ratios with microscopic repeatability.
Built with special surface-treated ductile iron housings for enhanced chemical corrosion protection, the HYH7VK Series 10 incorporates a high-efficiency axial tapered piston rotary group and an advanced dual shaft seal system composed of fluorocarbon rubber (FKM) and polytetrafluoroethylene (PTFE). An integrated flushing chamber equipped with barrier fluid ports (U1 to U4) facilitates real-time seal integrity monitoring, preventing air ingress, moisture contamination, or toxic isocyanate leakage to the environment. Built in the open design (HYH7VKO) where the pump housing is connected directly to the suction chamber (eliminating the need for an external case drain line back to the reservoir, with suction port pressure permissible up to 6 bar abs), the pump matches the mounting flange, drive shaft, and functional dimensions of both Bosch Rexroth A7VK Series 10 (A7VKO) and historical A2VK models, enabling seamless, zero-rework field retrofits.
| Dimension of HENGYUHANG HYH7VK Series 10
| Interface Data Needed with the Drawing (Sizes 12, 28, 55, 107)
| Interface Parameter | Size 12 (HYH7VK 12) | Size 28 (HYH7VK 28) | Size 55 (HYH7VK 55) | Size 107 (HYH7VK 107) | Engineering Verification & Assembly Notes |
|---|---|---|---|---|---|
| Mounting Flange Standard | ISO 3019-2 4-bolt (Code KG, 80-4) | ISO 3019-2 4-bolt (Code LG, 100-4) | ISO 3019-2 4-bolt (Code MS, 125-4) | ISO 3019-2 4-bolt (Code PS, 160-4) | Interchangeable mounting pattern with legacy A2VK series |
| Pilot Spigot Diameter | Ø 80 mm (−0.074/0) | Ø 100 mm (−0.087/0) | Ø 125 mm (−0.100/0) | Ø 160 mm (−0.100/0) | Precision centering spigot for pump bell housing alignment |
| Bolt Pitch Circle Diameter | Ø 100 mm | Ø 125 mm | Ø 160 mm | Ø 200 mm | Symmetrical 4-bolt circular mounting pattern (45° offset) |
| Flange Fixing Thread | 4 × M8 female thread | 4 × M10 female thread | 4 × M16 female thread | 4 × M16 female thread | Fastener engagement depth according to DIN standard |
| Drive Shaft Standard | Cylindrical keyed P3 (DIN 6885) | Cylindrical keyed P5 (DIN 6885) | Cylindrical keyed P6 (DIN 6885) | Cylindrical keyed P9 (DIN 6885) | Parallel keyed drive shaft with end centering thread DIN 332 |
| Shaft Diameter & Fit | Ø 20 mm (+0.002/+0.015) | Ø 25 mm (+0.002/+0.015) | Ø 30 mm (+0.002/+0.015) | Ø 40 mm (+0.002/+0.018) | Precision cylindrical ground shaft with chamfered lead-in |
| Fitted Drive Key | A6 × 6 × 25.5 (DIN 6885) | AS8 × 7 × 40 (DIN 6885) | AS8 × 7 × 43 (DIN 6885) | AS12 × 8 × 63 (DIN 6885) | Key width 6 mm / 8 mm / 8 mm / 12 mm |
| Shaft Centering Thread | M6 × 1 (thread depth 16 mm) | M8 × 1.25 (thread depth 19 mm) | M12 × 1.5 (thread depth 28 mm) | M12 × 1.5 (thread depth 28 mm) | Tapped center bore according to DIN 332 |
| Working Port A (Outlet / Pressure) | DIN 3852: M22 × 1.5 (depth 14 mm) | DIN 3852: M27 × 2 (depth 16 mm) | DIN 3852: M33 × 2 (depth 18 mm) | DIN 3852: M42 × 2 (depth 20 mm) | Service port high-pressure side (p max = 315 bar abs) |
| Suction Port S (Inlet / Filling) | DIN ISO 228: G 1 1/4 (depth 20 mm) | DIN ISO 228: G 1 1/2 (depth 20 mm) | DIN ISO 228: G 2 (depth 27 mm) | DIN ISO 228: G 2 1/2 (depth 30 mm) | Suction/filling port inlet side (p max = 6 bar abs) |
| Case Drain Ports T1, T2 | DIN 3852: M12 × 1.5 (depth 12 mm) | DIN 3852: M18 × 1.5 (depth 12 mm) | DIN 3852: M18 × 1.5 (depth 12 mm) | DIN 3852: M18 × 1.5 (depth 12 mm) | Plugged on delivery; housing connected internally to suction S |
| Bearing Flushing Port U | DIN 3852: M12 × 1.5 (depth 12 mm) | DIN 3852: M16 × 1.5 (depth 12 mm) | DIN 3852: M18 × 1.5 (depth 12 mm) | DIN 3852: M18 × 1.5 (depth 12 mm) | Recommended for highly viscous media (flushing flow 2.5 to 8 L/min) |
| Barrier Fluid Ports U1 to U4 | DIN 3852: M10 × 1 (depth 8 mm) | DIN 3852: M10 × 1 (depth 8 mm) | DIN 3852: M10 × 1 (depth 8 mm) | DIN 3852: M10 × 1 (depth 8 mm) | Barrier fluid monitoring chamber (p max = 3 bar abs) |
| HP Relief Return Port T3 (Optional) | DIN 3852: M18 × 1.5 | DIN 3852: M22 × 1.5 | DIN 3852: M27 × 2 | DIN 3852: M33 × 2 | Tank return port when optional direct relief valve is mounted |
| Pump Installation Specifications HENGYUHANG HYH7VK Series 10
| Comprehensive Ordering Code Structure (Aligned with RE 94010 Series 10 Open Design)
Code structure — reference: HYH7VK−O−Size−Control/10−Threads−Rotation−Seals−Flange−Shaft−Port−PRV−Version
| Position | Code Element | Specification Options | Description & Functional Details |
|---|---|---|---|
| 01 | Axial Piston Unit | HYH7VK | Variable bent-axis axial piston pump, nominal pressure 250 bar, maximum pressure 315 bar |
| 02 | Operation Mode | O | Open design (housing connected to suction chamber; no external case drain line to reservoir needed, suction up to 6 bar abs) |
| 03 | Displacement Size | 012, 028, 055, 107 | Size 12: 11.6 cm³/rev (0.71 in³/rev); Size 28: 28.1 cm³/rev (1.71 in³/rev); Size 55: 54.8 cm³/rev (3.34 in³/rev); Size 107: 107.0 cm³/rev (6.53 in³/rev) |
| 04 | Control Device | MA | Manual control with handwheel, threaded spindle adjustment, integrated display scale, and clamping device |
| 05 | Series | 10 | Series 1, Index 0 (Baureihe 10) |
| 06 | Thread Standard | M | Metric port and fixing threads with profile sealing ring according to DIN 3852 |
| 07 | Direction of Rotation | R, L | R = Clockwise rotation (standard, viewed from drive shaft end); L = Counter-clockwise rotation (option, viewed from drive shaft end) |
| 08 | Sealing System | S | FKM (fluorocarbon rubber / Viton) seals, double shaft seal with PTFE sealing lip and flushing chamber |
| 09 | Mounting Flange | KG, LG, MS, PS | Similar to ISO 3019-2 4-bolt flange (directly interchangeable with legacy A2VK): KG = 80-4 pattern (pilot Ø 80 mm, bolt circle Ø 100 mm) for Size 12; LG = 100-4 pattern (pilot Ø 100 mm, bolt circle Ø 125 mm) for Size 28; MS = 125-4 pattern (pilot Ø 125 mm, bolt circle Ø 160 mm) for Size 55; PS = 160-4 pattern (pilot Ø 160 mm, bolt circle Ø 200 mm) for Size 107 |
| 10 | Drive Shaft | P3, P5, P6, P9 | Cylindrical parallel keyed shaft according to DIN 6885: P3 = Ø 20 mm with key A6×6×25.5 (Size 12); P5 = Ø 25 mm with key AS8×7×40 (Size 28); P6 = Ø 30 mm with key AS8×7×43 (Size 55); P9 = Ø 40 mm with key AS12×8×63 (Size 107) |
| 11 | Service Line Ports | 5 | Open design: threaded service ports A (pressure) and S (suction), on opposite sides |
| 12 | Pressure Relief Valve | 0000, A100, A150, A200, A230, A250 | 0000 = Without pressure relief valve (standard); A100 = Direct-controlled high-pressure relief valve, fixed setting Δp = 100 bar; A150 = Direct-controlled high-pressure relief valve, fixed setting Δp = 150 bar; A200 = Direct-controlled high-pressure relief valve, fixed setting Δp = 200 bar; A230 = Direct-controlled high-pressure relief valve, fixed setting Δp = 230 bar; A250 = Direct-controlled high-pressure relief valve, fixed setting Δp = 250 bar |
| 13 | Special Version Code | 0, S | 0 = Standard production version; S = Special customized execution (special porting, alternate coatings, or customer adaptations) |
| Reading Your Replacement Code
| Target Bosch Rexroth Part Code | HENGYUHANG Replacement Code | Direct Interchange Verification Notes |
|---|---|---|
| A7VKO 012 MA / 10M-R-S-KG-P3-5-0000-0 | HYH7VKO-012-MA/10M-R-S-KG-P3-5-0000-0 | Direct 1:1 drop-in: Size 12 open design, 11.6 cm³/rev, handwheel MA, CW rotation, FKM+PTFE seals, flange KG (Ø80 pilot), keyed shaft P3 (Ø20), open ports (M22×1.5 / G1 1/4), without PRV |
| A7VKO 028 MA / 10M-R-S-LG-P5-5-0000-0 | HYH7VKO-028-MA/10M-R-S-LG-P5-5-0000-0 | Direct 1:1 drop-in: Size 28 open design, 28.1 cm³/rev, handwheel MA, CW rotation, FKM+PTFE seals, flange LG (Ø100 pilot), keyed shaft P5 (Ø25), open ports (M27×2 / G1 1/2), without PRV |
| A7VKO 055 MA / 10M-R-S-MS-P6-5-0000-0 | HYH7VKO-055-MA/10M-R-S-MS-P6-5-0000-0 | Direct 1:1 drop-in: Size 55 open design, 54.8 cm³/rev, handwheel MA, CW rotation, FKM+PTFE seals, flange MS (Ø125 pilot), keyed shaft P6 (Ø30), open ports (M33×2 / G2), without PRV |
| A7VKO 107 MA / 10M-R-S-PS-P9-5-0000-0 | HYH7VKO-107-MA/10M-R-S-PS-P9-5-0000-0 | Direct 1:1 drop-in: Size 107 open design, 107.0 cm³/rev, handwheel MA, CW rotation, FKM+PTFE seals, flange PS (Ø160 pilot), keyed shaft P9 (Ø40), open ports (M42×2 / G2 1/2), without PRV |
| A7VKO 028 MA / 10M-L-S-LG-P5-5-0000-0 | HYH7VKO-028-MA/10M-L-S-LG-P5-5-0000-0 | Direct 1:1 drop-in: Size 28 open design, counter-clockwise rotation (L), handwheel MA, FKM+PTFE seals, flange LG, shaft P5, open ports, without PRV |
| A7VKO 028 MA / 10M-R-S-LG-P5-5-A250-0 | HYH7VKO-028-MA/10M-R-S-LG-P5-5-A250-0 | Direct 1:1 drop-in: Size 28 open design, with mounted direct-controlled high-pressure relief valve set at Δp = 250 bar |
| Techspecs of HENGYUHANG HYH7VK Series 10
| 4.1 Standard Unit Technical Data (Sizes 12, 28, 55, 107 Aligned with RE 94010)
| Parameter / Technical Specification | Symbol | Unit | Size 12 | Size 28 | Size 55 | Size 107 | Engineering Verification Notes |
|---|---|---|---|---|---|---|---|
| Geometric Displacement (Maximum) | Vg max | cm³/rev | 11.6 | 28.1 | 54.8 | 107.0 | Full stroke displacement rating per shaft revolution |
| Geometric Displacement (Minimum) | Vg min | cm³/rev | 0 | 0 | 0 | 0 | Steplessly adjustable down to complete zero delivery |
| Flow Delivery at Rated Speed (n = 1500 min⁻¹) | qv 1500 | L/min | 17.4 | 42.2 | 82.2 | 160.5 | Calculated at Vg max under theoretical conditions (4.6 to 42.4 gpm) |
| Flow Delivery at Electric Motor Speed (n = 1800 min⁻¹) | qv 1800 | L/min | 20.9 | 50.6 | 98.6 | 192.6 | Calculated at Vg max under theoretical conditions (5.5 to 50.9 gpm) |
| Drive Power at n = 500 min⁻¹ (Δp = 250 bar) | P 1500 | kW | 7.3 | 17.6 | 34.2 | 66.9 | Power required at rated continuous working pressure (9.8 to 89.7 HP) |
| Drive Power at n = 1800 min⁻¹ (Δp = 250 bar) | P 1800 | kW | 8.7 | 21.1 | 41.1 | 80.3 | Power required at 60 Hz electric motor speed (11.7 to 107.7 HP) |
| Drive Torque Delivery at Vg max (Δp = 250 bar) | T | N·m | 46.2 | 111.8 | 218.0 | 425.7 | Input shaft drive torque required at 250 bar differential |
| Rotary Group Weight (Approximate Dry Mass) | m | kg | 11.7 | 22.1 | 31.0 | 55.0 | Total pump net mass without fluid or packaging (25.8 to 121.3 lbs) |
| Handwheel Adjustment Turns (Vg min → Vg max) | Us | turns | 23 | 30 | 40 | 50 | Number of handwheel revolutions across full stroke range |
| Maximum Handwheel Operating Torque | T max | N·m | 3.5 | 3.5 | 3.5 | 3.5 | Low manual actuation effort; with clamp locking unit |
| Recommended Bearing Flushing Flow | q flush | L/min | 2.5 | 4.0 | 4.0 | 8.0 | Recommended on applications with high-viscosity components |
| 4.2 Working Pressure Range & Differential Operating Limits (from RE 94010)
| Pressure Parameter | Symbol | Metric Rating | US Imperial Rating | Operational Definition & System Boundaries |
|---|---|---|---|---|
| Nominal Working Pressure | p nom | 250 bar absolute | 3,600 psi | Maximum continuous operating design pressure at service port A |
| Maximum Peak Pressure | p max | 315 bar absolute | 4,550 psi | Maximum operating pressure within single 10 s operating period |
| Single Operating Period Limit | t single | 10 seconds | 10 seconds | Permissible duration for transient pressure excursion up to 315 bar |
| Total Cumulative Peak Period | t total | 50 hours | 50 hours | Maximum cumulative permissible operating time at p max over pump service life |
| Minimum Pressure (High-Pressure Side) | p min | 10 bar absolute | 145 psi | Minimum required service port pressure to prevent slipper lift and damage |
| Rate of Pressure Change | RA max | 9,000 bar/s | 130,500 psi/s | Maximum permissible rate of pressure build-up and pressure reduction |
| Suction Port Inlet Pressure (Open Design HYH7VKO) | p S | 1 to 6 bar absolute | 14.5 to 87 psi abs | Complete filling must be ensured; housing connected to suction chamber |
| Maximum Shaft Seal Spike Pressure | p seal spike | 10 bar absolute | 145 psi abs | Brief momentary spike permitted (t < 0.1 s) across shaft seal |
| Barrier Fluid Monitoring Pressure (Ports U1 – U4) | p barrier | 3 bar absolute | 43.5 psi abs | Case pressure must satisfy: p case ≥ p barrier ≥ p external |
| 4.3 General Operating Conditions & Fluid Compatibility (Aligned with RE 94010)
| Parameter | Permissible Operating Range | Optimal Target Condition | Engineering Compliance Notes |
|---|---|---|---|
| Approved Media Types | Polyurethane components: Polyols & Isocyanates (MDI/TDI) | Clean, degassed chemical raw materials | Inquire with engineering for special hydraulic oils or chemical additives |
| Operating Viscosity Range | ν = 5 to 1,600 mm²/s (cSt) | Optimized for process fluid viscosity | Bearing flushing via port U is recommended for ν > 100 mm²/s |
| Operating Temperature Range | t = 10 °C to 50 °C (optimum range) | +20 °C to +40 °C (+68 °F to +104 °F) | Maximum permissible operating temperature t max = 80 °C (176 °F) |
| Filtration Rating | Absolute filtration rating η abs ≤ 125 μm | Clean in-line filtration before pump inlet | Filters must be arranged so only clean, pre-filtered fluid enters the unit |
| Sealing System Construction | Fluorocarbon rubber (FKM) with PTFE shaft seal | Dual shaft seal with barrier fluid flushing | Barrier fluid monitor connected to U1 – U4 ensures zero-leakage detection |
| Mounting Position & Orientation | Horizontal drive shaft orientation (standard) | Drive shaft horizontal, ports facing upward | In open design, housing fluid is connected directly to suction chamber S |
Advantages
Optimized Bent-Axis Metering Precision
Robust bent-axis rotary group with axial tapered pistons delivers exceptionally stable, low-pulsation volumetric displacement with zero internal slippage variations, maintaining precise chemical stoichiometry.
Double Shaft Sealing with Barrier Fluid Protection
Incorporates a specialized dual-seal configuration (FKM + PTFE) with an integrated flushing chamber (U₁ to U₄) that enables barrier fluid monitoring for zero-leakage environmental protection and early warning of seal wear.
Direct Drop-In Interchangeability with A7VK and A2VK
Mounting flanges, shaft dimensions, and centerline port locations match Bosch Rexroth A7VK Series 10 (A7VKO open design) exactly, while maintaining full mechanical backward compatibility with legacy A2VK series pumps.
Precision Manual Handwheel (MA) with Optical Scale
The threaded adjustment spindle provides stepless setting from maximum stroke down to zero delivery (Vg=0), complete with an integrated precision optical position indicator and locking clamp to prevent accidental drift.
Corrosion-Resistant Surface Protection
Critical ductile iron housing surfaces undergo proprietary chemical treatments to resist attack from aggressive isocyanates, polyol formulations, amine catalysts, and cleaning solvents.
Streamlined Open-Circuit Installation
Open design directly connects the pump housing to the suction chamber, eliminating external case drain piping to the reservoir while permitting positive suction inlet supercharge pressures up to 6 bar abs.
Reference
Displacement & Control Configuration Matrix
Available Displacement Sizes:
HYH7VK 12: Nominal displacement 11.6 cm³/rev (0.71 in³/rev); delivery 17.4 L/min @ 1,500 rpm, 20.9 L/min @ 1,800 rpm; dry mass 11.7 kg.
HYH7VK 28: Nominal displacement 28.1 cm³/rev (1.71 in³/rev); delivery 42.2 L/min @ 1,500 rpm, 50.6 L/min @ 1,800 rpm; dry mass 22.1 kg.
HYH7VK 55: Nominal displacement 54.8 cm³/rev (3.34 in³/rev); delivery 82.2 L/min @ 1,500 rpm, 98.6 L/min @ 1,800 rpm; dry mass 31.0 kg.
HYH7VK 107: Nominal displacement 107.0 cm³/rev (6.53 in³/rev); delivery 160.5 L/min @ 1,500 rpm, 192.6 L/min @ 1,800 rpm; dry mass 55.0 kg.
Control Architecture:
MA Manual Handwheel Control: Mechanical adjustment via threaded spindle with internal mechanical stops; spindle turns from zero to full stroke (Us=23,30,40,50 turns); operating torque ≤3.5 N⋅m; integrated precision stroke display and clamp locking unit.
Optional High-Pressure Relief Valve: Direct-operated, fixed-setting cartridge mounted directly on port A; standard pressure differential settings Δp=100,150,200,230, and 250 bar with return port T3.
Target Brand Interchangeability Matrix
The HENGYUHANG HYH7VK Series 10 provides verified 1:1 direct mechanical and hydraulic interchangeability across the Bosch Rexroth A7VK Series 10 open design product line:
Bosch Rexroth A7VKO 012 MA / 10M-R-S-KG-P3-5 → HYH7VKO-012-MA/10M-R-S-KG-P3-5 (Size 12, open design, clockwise)
Bosch Rexroth A7VKO 028 MA / 10M-R-S-LG-P5-5 → HYH7VKO-028-MA/10M-R-S-LG-P5-5 (Size 28, open design, clockwise)
Bosch Rexroth A7VKO 055 MA / 10M-R-S-MS-P6-5 → HYH7VKO-055-MA/10M-R-S-MS-P6-5 (Size 55, open design, clockwise)
Bosch Rexroth A7VKO 107 MA / 10M-R-S-PS-P9-5 → HYH7VKO-107-MA/10M-R-S-PS-P9-5 (Size 107, open design, clockwise)
Bosch Rexroth A7VKO 012 MA / 10M-L-S-KG-P3-5 → HYH7VKO-012-MA/10M-L-S-KG-P3-5 (Size 12, open design, counter-clockwise)
Bosch Rexroth A7VKO 028 MA / 10M-L-S-LG-P5-5 → HYH7VKO-028-MA/10M-L-S-LG-P5-5 (Size 28, open design, counter-clockwise)
Bosch Rexroth A7VKO 055 MA / 10M-L-S-MS-P6-5 → HYH7VKO-055-MA/10M-L-S-MS-P6-5 (Size 55, open design, counter-clockwise)
Bosch Rexroth A7VKO 107 MA / 10M-L-S-PS-P9-5 → HYH7VKO-107-MA/10M-L-S-PS-P9-5 (Size 107, open design, counter-clockwise)
Legacy Retrofits: Direct drop-in replacement for Rexroth A2VK series metering pumps (A2VK 12, A2VK 28, A2VK 55, A2VK 107) with identical mounting flange, drive shaft, and functional geometry.
Brand Replacement
HENGYUHANG manufactures the HYH7VK Series 10 as a high-precision, direct-replacement solution for OEM chemical metering pumps in polyurethane processing machinery:
Bosch Rexroth: Full 1:1 interchangeability for A7VK Series 10 (A7VKO open design) and historical A2VK Series (A2VK 12, A2VK 28, A2VK 55, A2VK 107).
Polyurethane OEM Machinery Compatibility: Fully compatible with high-pressure and low-pressure metering units from KraussMaffei, Hennecke, Cannon, Tartarini, Saip, Rimaster, and OMS Group.
Component Interchangeability: Shaft centerlines, 4-bolt ISO 3019-2 mounting flanges, DIN 6885 keyed drive shafts, and threaded port geometries align identically, requiring no modification to existing machine mounting plates, drive couplings, or pipework.
Applications
High-Pressure Reaction Injection Molding (RIM): Precision metering of polyol and isocyanate streams into high-pressure impingement mixing heads at pressures up to 250 bar.
Automotive Interior Component Foaming: Polyurethane dosing for automotive seating cushions, instrument panel soft-trim, steering wheels, acoustic sound-deadening insulation, and headrests.
Rigid Polyurethane Thermal Insulation Panels: Continuous double-belt lamination lines for building insulation panels, cold storage sandwich panels, and commercial refrigeration cabinets.
Flexible Slabstock Foam Production: Continuous foaming lines for furniture mattresses, upholstered seating, and packaging foams requiring precise, pulse-free component delivery.
Adhesive, Sealant & Elastomer Dispensing: High-accuracy stoichiometric metering of two-component polyurethane adhesives, structural sealants, potting resins, and microcellular elastomers.
Chemical Dosing & Pilot Plant Test Skids: Pilot-scale chemical processing and research laboratory test rigs requiring infinitely adjustable, repeatable variable displacement under medium pressure.
Package & Shipping
| Packaging Construction | Heavy-duty multi-layer export-grade solid wooden case with reinforced internal cradle and shock-absorbing high-density polyethylene foam inserts. |
|---|---|
| Corrosion Protection | Internal flushing with moisture-free chemical test oil; all exposed precision ground surfaces (drive shaft, mounting pilot) treated with VCI anti-corrosion barrier and vacuum-sealed in heavy-gauge barrier foil. |
| Port & Shaft Protection | Heavy-duty threaded steel and plastic protective plugs installed on all service, suction, drain, flushing, and barrier fluid ports; drive shaft fitted with heavy-duty protective composite sleeve. |
| Package Dimensions (Approx.) | Size 12: 380 × 280 × 260 mm; Size 28: 450 × 320 × 300 mm; Size 55: 520 × 360 × 340 mm; Size 107: 620 × 420 × 400 mm. |
| Gross Shipping Weight | Size 12: approx. 15.0 kg; Size 28: approx. 26.5 kg; Size 55: approx. 37.0 kg; Size 107: approx. 64.0 kg (inclusive of export crating). |
| Standard Lead Time | Standard displacement configurations dispatched within 48–72 hours from inventory; custom-engineered or special-mount units completed in 10–15 business days. |
| Global Shipping Options | Air Express (DHL, FedEx, UPS, TNT), Air Cargo door-to-airport, Sea Freight FCL/LCL, and multimodal international rail transport with DDP/DAP terms available. |
| Quality Documentation | Complete factory inspection test certificate, volumetric efficiency test record, hydrostatic pressure test report, and CE declaration of conformity included in each shipment. |
Why Choose Hengyuhang?
Direct Factory Precision Manufacturing & CNC Excellence: Manufactured in our state-of-the-art hydraulic facility utilizing German and Japanese 5-axis machining centers, precision CNC cylindrical grinding machines, and sub-micron honing systems, ensuring rotary group dimensional tolerances within ±0.002 mm and surface roughness Ra < 0.2 μm.
100% Full-Cycle Multi-Parameter Factory Inspection: Every HYH7VK pump undergoes 100% automated test bench calibration prior to shipment, verifying volumetric efficiency (>93%), continuous and peak pressure holding (250/315 bar), internal case leakage, mechanical torque, noise spectrum, and zero-leakage barrier fluid chamber sealing.
Seamless 1:1 OEM Drop-In Interchangeability: Engineered to strict international ISO 3019-2 and DIN standards, guaranteeing direct, plug-and-play mechanical and hydraulic interchangeability with Bosch Rexroth A7VK Series 10 (A7VKO open design) and legacy A2VK series pumps without piping or mounting modifications.
Flexible Engineering Customization & Rapid Prototyping: Supported by senior fluid power and chemical machinery engineers, we provide tailored solutions including specialized corrosion-resistant coatings, custom flange patterns, alternative seal materials (EPDM, FFKM), integrated relief valve calibrations, and rapid prototype delivery with low MOQ requirements.
Robust Supply Chain, Extensive Inventory & Fast Global Dispatch: Extensive inventory of finished assemblies, ductile iron castings, bent-axis rotary groups, shafts, and seal kits ensures standard units ship within 48 to 72 hours, backed by reliable worldwide express logistics (DHL, FedEx, UPS) and door-to-door DDP services.
12-Month Comprehensive Warranty & Lifetime Technical Support: All products are covered by a full 12-month comprehensive warranty and backed by lifetime engineering assistance, including complimentary CAD model verification, installation troubleshooting, and 24-hour rapid technical customer response.
HENGYUHANG Axial Piston Variable Displacement Metering Pump HYH7VK Series 10 (High-Precision Polyurethane Component Metering Pump, 11.60~107.00 cm³/rev) is a specialized, ultra-precise bent-axis variable axial piston pump engineered specifically for metering, dosing, and high-pressure pumping of polyurethane reaction injection molding (RIM) liquid components, including isocyanate (ISO) and polyol (POLY). Developed as a 100% direct dimensional, hydraulic, and functional custom drop-in replacement for the global industry benchmark Bosch Rexroth A7VK Series 10 (A7VK 012, A7VK 028, A7VK 055, A7VK 107) and earlier A2VK series, the HYH7VK Series 10 features a proven tapered piston rotary group providing stepless, micro-adjustable displacement from 0 cm³/rev (Vg_min = 0) up to full nominal capacity (Vg_max up to 107.0 cm³/rev). Built for continuous nominal operating pressures (p_nom) of 250 bar (3,625 psi / 25 MPa) and peak surge pressures (p_max) up to 315 bar (4,568 psi / 31.5 MPa), this pump series is manufactured in two dedicated structural configurations: the Open Design (HYH7VKO), in which the housing connects directly to the suction chamber to eliminate separate external case drain lines, and the Closed Design (HYH7VKG), featuring an isolated filling channel that permits low-pressure filling pressures up to 30 bar for highly viscous chemical media. Equipped with heavy-duty ISO 3019-2 4-bolt metric mounting flanges (centering pilot Ø80 mm to Ø160 mm), cylindrical keyed drive shafts to DIN 6885 (Ø20 mm to Ø40 mm), an ergonomic manual handwheel adjustment mechanism (MA control) featuring an integrated precision digital display scale and clamp locking device, special chemical-resistant fluorocarbon (FKM) and polytetrafluoroethylene (PTFE) double shaft seal assemblies with barrier fluid monitoring ports (U1~U4), and optional direct-acting fixed high-pressure relief valves (A100~A250 bar), the HYH7VK Series 10 delivers unmatched volumetric dosing accuracy, repeatable shot consistency, and complete field interchangeability without pipework or mounting modifications.
| Applications
The HYH7VK Series 10 axial piston variable metering pump is specifically engineered for high-pressure and low-pressure chemical reaction equipment processing polyurethane components, polyols, isocyanates, and aggressive viscous additives:
High-Pressure Polyurethane Reaction Injection Molding (RIM): Delivers precise, pulsation-free stoichiometric component metering of isocyanate and polyol into high-pressure impingement mixing heads at continuous operating pressures up to 250 bar.
Rigid Polyurethane Foam Dispensing Lines: Meters chemical foam formulations for continuous thermal insulation sandwich panel production, cold-storage wall panels, pipe-in-pipe insulation, and commercial refrigerator cabinet foaming.
Automotive Interior and Acoustic Component Manufacturing: Powers robotic foaming cells for automotive seating cushions, instrument panels, acoustic engine covers, headrests, and steering wheel polyurethane molding.
Flexible Foam and Polyurethane Elastomer Casting: Provides continuous, micro-stepless flow calibration for cast elastomer production, heavy-duty mining screen panels, printing rollers, and solid industrial polyurethane tires.
Shoe Sole and Footwear Molding Automation: Ensures shot-to-shot volumetric reproducibility in multi-station rotary casting machines for single- and dual-density polyurethane footwear soles.
Adhesive, Sealant, and Resin Pumping Systems: Accommodates highly viscous fluids ranging from 5 to 1,600 mm²/s with dedicated bearing flushing ports and barrier fluid leakage detection chambers.
| Key Specifications Overview
| Parameter | Engineering Specification (Series 10 Polyurethane Metering Standard) |
|---|---|
| Pump Architecture | Variable Bent-Axis Axial Piston Rotary Group with Tapered Piston Technology for Precise Component Metering |
| Standard Displacement Frame Sizes | 4 Standard Frame Sizes: HYH7VK 012, HYH7VK 028, HYH7VK 055, HYH7VK 107 cm³/rev |
| Structural Design Variants | Open Design (HYH7VKO, internal case-suction connection) / Closed Design (HYH7VKG, separated case drain channel) |
| Nominal Continuous Pressure (p_nom) | 250 bar (3,625 psi / 25 MPa) absolute continuous design pressure at service port A or B |
| Maximum Peak Operating Pressure (p_max) | 315 bar (4,568 psi / 31.5 MPa) absolute peak pressure (single period max 10 s, cumulative operating limit 50 h) |
| Minimum Pressure at High-Pressure Port (p_min) | 10 bar (145 psi) absolute minimum pressure required at port A or B to prevent piston shoe lift-off |
| Maximum Rate of Pressure Change (RA_max) | 9,000 bar/s (130,500 psi/s) maximum permissible rate of pressure build-up and reduction across entire operating range |
| Closed Design Low-Pressure Port Limits (HYH7VKG) | Minimum filling pressure: >1.0 bar absolute; Maximum permissible filling pressure: 30.0 bar (435 psi) absolute |
| Open Design Suction Port Limits (HYH7VKO) | Minimum filling pressure: 1.0 bar absolute; Maximum permissible suction port inlet pressure: 6.0 bar (87 psi) absolute |
| Maximum Case Drain Pressure (p_L max) | 6.0 bar (87 psi) absolute at ports T1 / T2 (internal housing pressure must strictly remain below 6 bar absolute) |
| Displacement Stepless Adjustment Range | Continuous manual variation from Vg_min = 0 cm³/rev (zero delivery) to Vg_max (11.6, 28.1, 54.8, 107.0 cm³/rev) |
| Flow Delivery Range @ 1500 rpm | 17.4 L/min (HYH7VK 012), 42.2 L/min (HYH7VK 028), 82.2 L/min (HYH7VK 055), 160.5 L/min (HYH7VK 107) |
| Flow Delivery Range @ 1800 rpm | 20.9 L/min (HYH7VK 012), 50.6 L/min (HYH7VK 028), 98.6 L/min (HYH7VK 055), 192.6 L/min (HYH7VK 107) |
| Drive Power Consumption @ 250 bar (1500 rpm) | 7.3 kW (HYH7VK 012), 17.6 kW (HYH7VK 028), 34.2 kW (HYH7VK 055), 66.9 kW (HYH7VK 107) |
| Drive Power Consumption @ 250 bar (1800 rpm) | 8.7 kW (HYH7VK 012), 21.1 kW (HYH7VK 028), 41.1 kW (HYH7VK 055), 80.3 kW (HYH7VK 107) |
| Drive Torque Output @ 250 bar (Δp = 250 bar) | 46.2 Nm (HYH7VK 012), 111.8 Nm (HYH7VK 028), 218.0 Nm (HYH7VK 055), 425.7 Nm (HYH7VK 107) |
| Manual Control Mechanism (MA Control) | Precision spindle handwheel with digital mechanical position indicator and clamp lock against accidental adjustment |
| Spindle Turns (Vg_min to Vg_max) | Approx. 23 turns (012), 30 turns (028), 40 turns (055), 50 turns (107); Handwheel max torque: approx. 3.5 Nm |
| Shaft Sealing & Barrier Chamber System | Double shaft seal in FKM/PTFE with integrated barrier fluid flushing chamber (ports U1~U4 M10 × 1, max 3 bar) |
| Mounting Flange Standards | ISO 3019-2 4-bolt metric: 80-4 (012, Ø80 mm), 100-4 (028, Ø100 mm), 125-4 (055, Ø125 mm), 160-4 (107, Ø160 mm) |
| Drive Shaft Standards | Parallel keyed shaft to DIN 6885: P3 (Ø20 mm), P5 (Ø25 mm), P6 (Ø30 mm), P9 (Ø40 mm) |
| Fluid Media Compatibility | Polyurethane components (polyol, isocyanate); mineral oil HLP DIN 51524; specialized chemical dosing fluids |
| Fluid Viscosity Range | Kinematic viscosity: ν_min = 5 mm²/s to ν_max = 1600 mm²/s (bearing flushing via port U recommended for high viscosity) |
| Operating Temperature Range | Optimum fluid temperature range: +10°C to +50°C; Maximum fluid temperature: +80°C |
| Recommended Filtration Grade | Absolute filtration rating: η_abs ≤ 125 µm arranged in pump suction line before fluid entry |
| Technical Performance Matrix Across Available Sizes
| Model Code | Displacement (cm³/rev) | Operating Pressure (bar / psi) | Delivery Flow (L/min) | Drive Power @ 250 bar (kW) | Torque @ 250 bar (Nm) | Handwheel Turns (0 to Vg_max) | Pump Mass (kg, approx) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Vg_max | Vg_min | Nominal (p_nom) | Peak (p_max) | @ 1500 rpm | @ 1800 rpm | @ 1500 rpm | @ 1800 rpm | ||||
| HYH7VK 012 | 11.6 | 0 | 250 / 3,625 | 315 / 4,568 | 17.4 | 20.9 | 7.3 | 8.7 | 46.2 | approx. 23 | 11.7 |
| HYH7VK 028 | 28.1 | 0 | 250 / 3,625 | 315 / 4,568 | 42.2 | 50.6 | 17.6 | 21.1 | 111.8 | approx. 30 | 22.1 |
| HYH7VK 055 | 54.8 | 0 | 250 / 3,625 | 315 / 4,568 | 82.2 | 98.6 | 34.2 | 41.1 | 218.0 | approx. 40 | 31.0 |
| HYH7VK 107 | 107.0 | 0 | 250 / 3,625 | 315 / 4,568 | 160.5 | 192.6 | 66.9 | 80.3 | 425.7 | approx. 50 | 55.0 |
| Structural Variations: Open Design (HYH7VKO) vs. Closed Design (HYH7VKG)
| Structural Configuration | Fluid Routing & Case Drain Architecture | Permissible Pressure Envelope | Target Process Application & Benefit |
|---|---|---|---|
| Open Design (HYH7VKO) | Pump casing interior is internally routed and connected to suction port S. External case drain lines to reservoir are eliminated; ports T1 and T2 are sealed with factory plugs. | Suction port S filling pressure: 1.0 bar min to 6.0 bar max absolute; Working pressure port A: 250 bar nom / 315 bar peak. | Standard polyurethane metering machines with flooded day-tank or feed pump charging up to 6 bar. Reduces external hose clutter and prevents accidental case over-pressurization. |
| Closed Design (HYH7VKG) | Filling channel and pump housing are completely isolated. Low-pressure chemical feed is piped to port A or B; case drain fluid must be vented through a dedicated line via port T1 or T2. | Low-pressure side filling pressure: >1.0 bar min to 30.0 bar max absolute; Case drain pressure p_L: max 6.0 bar absolute. | Processing highly viscous chemical polyols, filled prepolymers, or high-pressure booster feeds up to 30 bar. Prevents high pre-charge pressure from loading the rotating shaft seal. |
| High-Precision Manual Adjustment Mechanism (MA Control) & Integrated Double Shaft Seal System
| System Module | Technical Design & Components | Operating Mechanics | Process Protection & Operational Advantage |
|---|---|---|---|
| MA Manual Handwheel Adjustment | Precision threaded spindle coupled to bent-axis swashplate yoke; integrates high-resolution mechanical digital display scale. | Stepless displacement setting from Vg_min (0 cm³) to Vg_max across 23 to 50 spindle revolutions; handwheel torque ≤3.5 Nm. | Features an integrated mechanical clamp locking unit that positively immobilizes the spindle, preventing unauthorized or vibration-induced ratio drift during production. |
| Double Shaft Sealing & Barrier Chamber | Dual chemical-grade PTFE / FKM radial lip seals forming an isolated intermediate flushing chamber between seals. | 4 radial barrier fluid ports (U1, U2, U3, U4; M10 × 1, 8 mm deep); barrier fluid pressure must remain ≤3 bar and below pump case pressure. | Allows constant circulation of mesamoll or compatible barrier plasticizers. Immediately indicates primary seal wear without leakage to environment and stops isocyanate crystallization. |
| Bearing Flushing Circuit (Port U) | Dedicated bearing lubrication and flushing connection port U (M12 × 1.5 to M18 × 1.5, DIN 3852). | Recommended external flushing flow rate: 2.5 L/min (size 012), 4.0 L/min (sizes 028/055), 8.0 L/min (size 107). | Crucial when pumping high-viscosity polyols or non-lubricating chemical additives, continuously purging the front shaft bearings to maximize operational service life. |
| Optional High-Pressure Relief Valve (PRV) | Direct-operated, fixed-setting high-pressure relief valve flanged directly to pump service port A or B with separate tank return port T3. | Factory pre-set differential pressure values (Δp): 100, 150, 200, 230, or 250 bar (standard factory setting: Δp = 250 bar). | Provides instantaneous overpressure protection directly at the pump head, protecting mixing head nozzles, high-pressure filters, and distribution manifolds from hydraulic shock. |
| Mounting Flange, Shaft and Port Specifications
| Model Size | Mounting Flange (ISO 3019-2 4-Bolt) | Drive Shaft (DIN 6885 Parallel Keyed) | Service & Auxiliary Ports (DIN 3852 / DIN ISO 228) |
|---|---|---|---|
| HYH7VK 012 | Code KG: ISO 3019-2 80-4; Centering pilot Ø80 mm (-0.074 mm); 4 × Ø9 mm through holes; bolt circle Ø100 mm | Code P3: Cylindrical keyed DIN 6885 Ø20 mm (fit k6); length 40 mm; key A6 × 6 × 32; center bore M6 | Open: Port A (M22 × 1.5, 315 bar), Port S (G 1 1/4 in, 6 bar); Closed: Ports A & B (M22 × 1.5); Drain T1/T2 (M12 × 1.5); Flush U (M12 × 1.5); Barrier U1~U4 (M10 × 1) |
| HYH7VK 028 | Code LG: ISO 3019-2 100-4; Centering pilot Ø100 mm (-0.087 mm); 4 × Ø9 mm through holes; bolt circle Ø125 mm | Code P5: Cylindrical keyed DIN 6885 Ø25 mm (fit k6); length 50 mm; key A8 × 7 × 40; center bore M10 | Open: Port A (M27 × 2, 315 bar), Port S (G 1 1/2 in, 6 bar); Closed: Ports A & B (M27 × 2); Drain T1/T2 (M18 × 1.5); Flush U (M16 × 1.5); Barrier U1~U4 (M10 × 1) |
| HYH7VK 055 | Code MS: ISO 3019-2 125-4; Centering pilot Ø125 mm (-0.100 mm); 4 × Ø11 mm through holes; bolt circle Ø160 mm | Code P6: Cylindrical keyed DIN 6885 Ø30 mm (fit k6); length 60 mm; key A8 × 7 × 45; center bore M10 | Open: Port A (M33 × 2, 315 bar), Port S (G 2 in, 6 bar); Closed: Ports A & B (M33 × 2); Drain T1/T2 (M18 × 1.5); Flush U (M18 × 1.5); Barrier U1~U4 (M10 × 1) |
| HYH7VK 107 | Code PS: ISO 3019-2 160-4; Centering pilot Ø160 mm (-0.100 mm); 4 × Ø14 mm through holes; bolt circle Ø200 mm | Code P9: Cylindrical keyed DIN 6885 Ø40 mm (fit k6); length 80 mm; key A12 × 8 × 70; center bore M16 | Open: Port A (M42 × 2, 315 bar), Port S (G 2 1/2 in, 6 bar); Closed: Ports A & B (M42 × 2); Drain T1/T2 (M18 × 1.5); Flush U (M18 × 1.5); Barrier U1~U4 (M10 × 1) |
| Direct Interchangeability and OEM Replacement Matrix (Rexroth A7VK Series 10 & A2VK)
| Hengyuhang Series | OEM Target Model | OEM Part Reference Code | Interchangeability and Drop-In Compliance |
|---|---|---|---|
| HYH7VK 012 | Bosch Rexroth A7VK 012 / A2VK 12 | A7VKO 012 MA / 10M-R-S-KG-P3-5-0000-0 | 100% direct dimensional and functional drop-in replacement; identical ISO 80-4 4-bolt flange, Ø20 mm shaft P3, M22 × 1.5 high-pressure port, and 23-turn MA handwheel. |
| HYH7VK 028 | Bosch Rexroth A7VK 028 / A2VK 28 | A7VKO 028 MA / 10M-R-S-LG-P5-5-0000-0 | Direct replacement for standard polyurethane dosing machines; identical ISO 100-4 flange, Ø25 mm keyed shaft, G 1 1/2 in suction port, and 42.2 L/min flow rating at 1500 rpm. |
| HYH7VK 055 | Bosch Rexroth A7VK 055 / A2VK 55 | A7VKO 055 MA / 10M-R-S-MS-P6-5-0000-0 | Direct replacement for medium-high flow continuous foaming lines; features ISO 125-4 flange, Ø30 mm keyed shaft, G 2 in suction port, and 218.0 Nm continuous torque at 250 bar. |
| HYH7VK 107 | Bosch Rexroth A7VK 107 / A2VK 107 | A7VKO 107 MA / 10M-R-S-PS-P9-5-0000-0 | Maximum-capacity polyurethane metering pump replacement; identical ISO 160-4 flange, Ø40 mm keyed shaft, M42 × 2 pressure port, G 2 1/2 in suction, and 160.5 L/min delivery @ 1500 rpm. |
| HYH7VK Closed Design | Bosch Rexroth A7VKG Series | A7VKG ... MA / 10M-R-S-...-5-0000-0 | Full closed-circuit replacement for highly viscous polyol and pressurized day-tank setups up to 30 bar filling pressure with external case drain through T1. |
| HYH7VK with Relief Valve | Rexroth A7VK with Flanged PRV | A7VK... with Option A100 / A150 / A200 / A250 | Direct interchangeable pump-mounted direct-acting pressure relief valve assembly with integrated T3 tank bypass connection. |
| Technical Performance Matrix Across Available Sizes
| Model Code | Displacement (cm³/rev) | Operating Pressure (bar / psi) | Delivery Flow (L/min) | Drive Power @ 250 bar (kW) | Torque @ 250 bar (Nm) | Handwheel Turns (0 to Vg_max) | Pump Mass (kg, approx) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Vg_max | Vg_min | Nominal (p_nom) | Peak (p_max) | @ 1500 rpm | @ 1800 rpm | @ 1500 rpm | @ 1800 rpm | ||||
| HYH7VK 012 | 11.6 | 0 | 250 / 3,625 | 315 / 4,568 | 17.4 | 20.9 | 7.3 | 8.7 | 46.2 | approx. 23 | 11.7 |
| HYH7VK 028 | 28.1 | 0 | 250 / 3,625 | 315 / 4,568 | 42.2 | 50.6 | 17.6 | 21.1 | 111.8 | approx. 30 | 22.1 |
| HYH7VK 055 | 54.8 | 0 | 250 / 3,625 | 315 / 4,568 | 82.2 | 98.6 | 34.2 | 41.1 | 218.0 | approx. 40 | 31.0 |
| HYH7VK 107 | 107.0 | 0 | 250 / 3,625 | 315 / 4,568 | 160.5 | 192.6 | 66.9 | 80.3 | 425.7 | approx. 50 | 55.0 |
| Hengyuhang Series | OEM Target Model | OEM Part Reference Code | Interchangeability and Drop-In Compliance |
|---|---|---|---|
| HYH7VK 012 | Bosch Rexroth A7VK 012 / A2VK 12 | A7VKO 012 MA / 10M-R-S-KG-P3-5-0000-0 | 100% direct dimensional and functional drop-in replacement; identical ISO 80-4 4-bolt flange, Ø20 mm shaft P3, M22 × 1.5 high-pressure port, and 23-turn MA handwheel. |
| HYH7VK 028 | Bosch Rexroth A7VK 028 / A2VK 28 | A7VKO 028 MA / 10M-R-S-LG-P5-5-0000-0 | Direct replacement for standard polyurethane dosing machines; identical ISO 100-4 flange, Ø25 mm keyed shaft, G 1 1/2 in suction port, and 42.2 L/min flow rating at 1500 rpm. |
| HYH7VK 055 | Bosch Rexroth A7VK 055 / A2VK 55 | A7VKO 055 MA / 10M-R-S-MS-P6-5-0000-0 | Direct replacement for medium-high flow continuous foaming lines; features ISO 125-4 flange, Ø30 mm keyed shaft, G 2 in suction port, and 218.0 Nm continuous torque at 250 bar. |
| HYH7VK 107 | Bosch Rexroth A7VK 107 / A2VK 107 | A7VKO 107 MA / 10M-R-S-PS-P9-5-0000-0 | Maximum-capacity polyurethane metering pump replacement; identical ISO 160-4 flange, Ø40 mm keyed shaft, M42 × 2 pressure port, G 2 1/2 in suction, and 160.5 L/min delivery @ 1500 rpm. |
| HYH7VK Closed Design | Bosch Rexroth A7VKG Series | A7VKG ... MA / 10M-R-S-...-5-0000-0 | Full closed-circuit replacement for highly viscous polyol and pressurized day-tank setups up to 30 bar filling pressure with external case drain through T1. |
| HYH7VK with Relief Valve | Rexroth A7VK with Flanged PRV | A7VK... with Option A100 / A150 / A200 / A250 | Direct interchangeable pump-mounted direct-acting pressure relief valve assembly with integrated T3 tank bypass connection. |
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