Product Description
Product Overview
The PVF-20-70-10S (small frame) and PVF-40-70-10S (large frame) belong to the ANSON PVF Series — a globally recognized platform of pressure-compensated, variable displacement vane pumps engineered specifically for industrial hydraulic systems demanding energy efficiency and quiet operation. The PVF series encompasses 3 frame sizes, 6 displacement options (8/12/15/20/30/40 L/min), and 4 pressure ratings (20/35/55/70 bar), providing 48 model combinations for optimal circuit design.
The PVF-20-70-10S is a small-frame variable displacement pump with a geometric displacement of 11 cm³/rev, delivering a rated output flow of 20 L/min at 3.5 bar and 1800 rpm. Its pressure adjustment range is 50-70 bar, featuring a splined shaft (S-type) and design revision 10. Once system pressure reaches the set point, the pump automatically reduces output flow to a minimum compensation level, effectively lowering power consumption and fluid heating during high-pressure standby conditions.
The PVF-40-70-10S is a large-frame variable displacement pump with a geometric displacement of 22 cm³/rev, delivering a rated output flow of 40 L/min at 3.5 bar and 1800 rpm. Its pressure adjustment range is 50-70 bar, featuring a splined shaft (S-type) and design revision 11 (exclusive to PVF-30/40 frames). This pump is designed for high-flow applications, suitable for medium-to-large hydraulic power units and injection molding clamp circuits.
Both models feature drop-in interchangeability with original ANSON specifications, compatibility with Yuken SVPF, Camel VCM-SF, and Kompass VA1/VB1/VD1/VE1 series equivalents, 100% factory testing under simulated working conditions, and integrated pressure and flow adjustment eliminating the need for external relief valves.
Technical Specifications
Model PVF-20-70-10S:
- Pump Series: PVF Pressure-Compensated Variable Displacement Vane Pump (ANSON)
- Frame Size: PVF-20
- Displacement Code: 20
- Geometric Displacement: 11 cm³/rev
- Rated Output Flow (@3.5 bar, 1800 rpm): 20 L/min
- Pressure Range Code: 70
- Pressure Adjustment Range: 50-70 bar
- Maximum Peak Pressure: 140 bar (instantaneous, must not exceed)
- Maximum Speed: 1800 rpm
- Minimum Stable Speed: 800 rpm
- Control Type: Pressure-compensated variable displacement (limiting pressure type)
- Factory Flow Setting: Qmax (maximum flow position)
- Factory Pressure Setting: Pmin (minimum pressure position)
- Rotation: Clockwise (viewed from shaft end)
- Shaft Type: S-type Splined Shaft
- Design No.: 10
- Mounting: Flange mounting (PVF standard)
- Volumetric Efficiency: ≥85% (rated conditions)
- Hydraulic Fluid (below 70 bar): 30-50 cSt at 40°C (ISO VG 32)
- Hydraulic Fluid (above 70 bar): 50-70 cSt at 40°C (ISO VG 68)
- Operating Oil Temperature: 15-60°C (continuous operation)
- Case Drain Backpressure: ≤0.3 bar (drain line must connect directly below oil surface)
- Suction Port Pressure: -0.3 bar to +0.3 bar
- Weight: approx. 6 kg (13.2 lbs)
- Housing Material: High-strength cast iron
- Seal Material: NBR (standard)
Model PVF-40-70-10S:
- Pump Series: PVF Pressure-Compensated Variable Displacement Vane Pump (ANSON)
- Frame Size: PVF-40
- Displacement Code: 40
- Geometric Displacement: 22 cm³/rev
- Rated Output Flow (@3.5 bar, 1800 rpm): 40 L/min
- Pressure Range Code: 70
- Pressure Adjustment Range: 50-70 bar
- Maximum Peak Pressure: 140 bar (instantaneous, must not exceed)
- Maximum Speed: 1800 rpm
- Minimum Stable Speed: 800 rpm
- Control Type: Pressure-compensated variable displacement (limiting pressure type)
- Factory Flow Setting: Qmax (maximum flow position)
- Factory Pressure Setting: Pmin (minimum pressure position)
- Rotation: Clockwise (viewed from shaft end)
- Shaft Type: S-type Splined Shaft
- Design No.: 11 (exclusive to PVF-30/40 frames)
- Mounting: Flange mounting (PVF standard)
- Volumetric Efficiency: ≥85% (rated conditions)
- Hydraulic Fluid (below 70 bar): 30-50 cSt at 40°C (ISO VG 32)
- Hydraulic Fluid (above 70 bar): 50-70 cSt at 40°C (ISO VG 68)
- Operating Oil Temperature: 15-60°C (continuous operation)
- Case Drain Backpressure: ≤0.3 bar (drain line must connect directly below oil surface)
- Suction Port Pressure: -0.3 bar to +0.3 bar
- Weight: approx. 9 kg (19.8 lbs)
- Housing Material: High-strength cast iron
- Seal Material: NBR (standard)
Key Technical Advantages
1. 3-Point Cam Ring Support — Stable High-Pressure Rotation
The PVF series employs ANSON’s patented 3-point cam ring support mechanism, formed by the control piston and bias piston creating a special 3-point load-bearing structure. This design significantly improves the cam ring’s rotational stability under high-pressure conditions, enabling the pump to deliver high-efficiency, stable performance even at the full 70 bar rated pressure. The 3-point support effectively constrains the cam ring’s radial displacement tendency under high pressure, preventing vibration and offset in the eccentric motion, ensuring precise clearance between vanes and the cam ring at all times — fundamentally guaranteeing volumetric efficiency stability.
The PVF series employs ANSON’s patented 3-point cam ring support mechanism, formed by the control piston and bias piston creating a special 3-point load-bearing structure. This design significantly improves the cam ring’s rotational stability under high-pressure conditions, enabling the pump to deliver high-efficiency, stable performance even at the full 70 bar rated pressure. The 3-point support effectively constrains the cam ring’s radial displacement tendency under high pressure, preventing vibration and offset in the eccentric motion, ensuring precise clearance between vanes and the cam ring at all times — fundamentally guaranteeing volumetric efficiency stability.
2. Pressure-Balanced Control Mechanism — Highly Stable Flow at High Pressure
The PVF series features an innovative pressure-balanced pressure control mechanism that precisely regulates the cam ring’s eccentricity through the balance of hydraulic feedback force and spring force. When system pressure reaches the set point, the cam ring automatically reduces its eccentricity, smoothly decreasing output flow to a minimum compensation level. Unlike on/off type variable mechanisms, the pressure-balanced control delivers highly stable and smooth flow output at high pressure without flow surges or pressure oscillations, ensuring stable operation of precision hydraulic systems.
The PVF series features an innovative pressure-balanced pressure control mechanism that precisely regulates the cam ring’s eccentricity through the balance of hydraulic feedback force and spring force. When system pressure reaches the set point, the cam ring automatically reduces its eccentricity, smoothly decreasing output flow to a minimum compensation level. Unlike on/off type variable mechanisms, the pressure-balanced control delivers highly stable and smooth flow output at high pressure without flow surges or pressure oscillations, ensuring stable operation of precision hydraulic systems.
3. Vibration-Dampened Design — Ultra-Low Operating Noise
The PVF series incorporates multiple sound-insulating and anti-vibration design features, with particular emphasis on optimizing cam ring rotational stability. The special 3-point support structure formed by the control piston and bias piston effectively reduces cam ring vibration amplitude during operation. Combined with precision-machined vane-to-cam-ring mating surfaces and optimized port window geometry, the PVF series operates without noticeable noise — measured noise levels are significantly lower than equivalent gear pumps and piston pumps. This makes it particularly suitable for machine tools and indoor industrial environments.
The PVF series incorporates multiple sound-insulating and anti-vibration design features, with particular emphasis on optimizing cam ring rotational stability. The special 3-point support structure formed by the control piston and bias piston effectively reduces cam ring vibration amplitude during operation. Combined with precision-machined vane-to-cam-ring mating surfaces and optimized port window geometry, the PVF series operates without noticeable noise — measured noise levels are significantly lower than equivalent gear pumps and piston pumps. This makes it particularly suitable for machine tools and indoor industrial environments.
4. Automatic Flow Compensation — Energy Efficient
The PVF variable displacement vane pump features automatic high-speed flow and compensation capability under the pressure setting. When the system requires low-pressure, high-flow conditions (e.g., rapid traverse), the pump delivers maximum flow; when system pressure rises to the set point (e.g., holding pressure), the pump automatically reduces flow to minimum maintenance level. Compared to fixed displacement pump + relief valve systems, the PVF variable pump significantly reduces power consumption during high-pressure, low-flow conditions and minimizes fluid heating — making it a highly energy-efficient vane pump and the optimal choice for efficient circuit design.
The PVF variable displacement vane pump features automatic high-speed flow and compensation capability under the pressure setting. When the system requires low-pressure, high-flow conditions (e.g., rapid traverse), the pump delivers maximum flow; when system pressure rises to the set point (e.g., holding pressure), the pump automatically reduces flow to minimum maintenance level. Compared to fixed displacement pump + relief valve systems, the PVF variable pump significantly reduces power consumption during high-pressure, low-flow conditions and minimizes fluid heating — making it a highly energy-efficient vane pump and the optimal choice for efficient circuit design.
5. No-Overshoot Cam Ring Control — High Response Sensitivity
The PVF series features an innovative cam ring control mechanism with no-overshoot design. This means during transient conditions such as start-up, stop, and load changes, the cam ring does not overshoot its target position due to inertia, maintaining system precision. The high response sensitivity ensures rapid and precise flow response during start-up and stop, guaranteeing repeatable positioning accuracy for precision machining equipment.
The PVF series features an innovative cam ring control mechanism with no-overshoot design. This means during transient conditions such as start-up, stop, and load changes, the cam ring does not overshoot its target position due to inertia, maintaining system precision. The high response sensitivity ensures rapid and precise flow response during start-up and stop, guaranteeing repeatable positioning accuracy for precision machining equipment.
6. Integrated Pressure & Flow Adjustment — Easy Maintenance
The PVF series places both pressure and flow adjustment devices on the same side of the pump, providing a compact structure for convenient maintenance and adjustment. Pressure adjustment: turn the pressure adjustment screw clockwise to decrease output pressure, counter-clockwise to increase. Flow adjustment: turn clockwise to reduce flow, counter-clockwise to increase. Factory standard setting is Qmax flow and Pmin pressure. Users can adjust to the optimal operating point based on actual conditions. The system can operate without an external relief valve, as the pump’s built-in pressure control mechanism handles pressure setting directly.
The PVF series places both pressure and flow adjustment devices on the same side of the pump, providing a compact structure for convenient maintenance and adjustment. Pressure adjustment: turn the pressure adjustment screw clockwise to decrease output pressure, counter-clockwise to increase. Flow adjustment: turn clockwise to reduce flow, counter-clockwise to increase. Factory standard setting is Qmax flow and Pmin pressure. Users can adjust to the optimal operating point based on actual conditions. The system can operate without an external relief valve, as the pump’s built-in pressure control mechanism handles pressure setting directly.
Application Areas
- Machine Tool Hydraulics: Clamping, feed, and tool-change circuits on CNC machining centers, lathes, and grinders; low-noise characteristics ideal for precision machining workshops
- Injection Molding Machines: 50–400 ton machines for clamp, mold-adjustment, and ejector circuits; variable displacement enables automatic switching between rapid clamp (high flow) and precision holding pressure (low flow, high pressure)
- Die Casting Machines: Clamp circuits for aluminum and zinc alloy die casting machines subject to cyclic shock loading
- Hydraulic Presses: Stamping, bending, and deep drawing press main drive circuits
- Industrial Power Units (HPU): Central hydraulic power sources where variable displacement effectively reduces standby energy consumption
- Woodworking Machinery: Hydraulic drives for panel saws, edge banders, and CNC routers
- Rubber & Leather Machinery: Vulcanizing presses, cutting machines, and high-frequency welding equipment
- Packaging Machinery: Hydraulic balers and blow molding machines
Expert Maintenance Tips
- Fluid Cleanliness Control: Maintain system fluid cleanliness at ISO 4406 18/16/13 or better. Install a 100–150 mesh suction strainer and a 10μm return-line filter. Contaminated fluid is the leading cause of abnormal vane wear and cam ring scoring.
- Viscosity & Temperature Management: For pressures below 70 bar, use hydraulic oil with viscosity of 30–50 cSt at 40°C (ISO VG 32); for pressures above 70 bar, use 50–70 cSt at 40°C (ISO VG 68). Maintain continuous operating oil temperature between 15–60°C. Perform a no-load warm-up cycle during cold starts to prevent cavitation from high-viscosity fluid.
- Case Drain Line Requirements: The case drain line must be piped directly to below the oil surface in the tank, and backpressure in the drain line must be maintained below 0.3 bar. Excessive drain backpressure increases internal leakage, reduces volumetric efficiency, and may cause shaft seal failure. The drain line must never be merged with other return lines or fitted with throttling valves.
- Shaft Alignment & Coupling Selection: Maintain shaft misalignment within 0.05 mm and angular error within 1°. Use a flexible coupling to absorb installation errors and axial float. Never use rigid couplings, as radial side-loads will cause premature bearing failure.
- Suction Conditions: Maintain suction port pressure between -0.3 bar and +0.3 bar. Keep suction piping as short and large-diameter as possible — pipe bore must not be smaller than the pump suction port. Excessive suction line resistance causes cavitation.
- Initial Start-Up & Air Bleeding: During initial start-up, repeatedly start the electric motor under no-load conditions to expel air from the pump cavity and suction line. Once the pump is confirmed to be delivering oil, continue no-load operation for 10 minutes to ensure complete air removal before applying load.
- Flow & Pressure Adjustment: To adjust flow, first loosen the lock nut, then turn the adjustment screw — clockwise to reduce flow, counter-clockwise to increase. After adjustment, tighten the lock nut. For pressure adjustment: clockwise decreases output pressure, counter-clockwise increases it. The sliding bolt has been correctly set at the factory during assembly calibration — do not adjust it, as this will destroy the pump’s pressure-flow characteristic curve.
- Splined Shaft Maintenance: Both PVF-20-70-10S and PVF-40-70-10S feature splined shafts (S-type), which offer higher wear resistance and better concentricity compared to Woodruff key shafts. Ensure the spline mating surface is clean and free of debris during installation. After assembly, manually rotate the shaft to verify smooth, binding-free operation. Apply a thin coat of grease to the spline mating surface to prevent corrosion.
Company Profile
Frequently Asked Questions
1.What ls our Main Products?
1.Hydraulic pump
2.Hydraulic valve
3.Hydraulic motor
4.Hydraulic cylinder
5.Hydraulic parts
2. What about the MOQ?
3.What are your advantages?
- Adhere to quality first.
- Support customization, ODM & OEM service.
- 1-year warranty and complete after-sales support.
- Safe and fast shipping worldwide.
- 24-hour online service for your inquiries.
4.Are you a manufacturer? What’s your delivery time?
Yes, we are a manufacturer with our own factory.
Common models are in stock, and orders are usually shipped within 1–3 days.
5.Which payment methods are accepted?
We accept T/T, L/C, PayPal, VISA, Western Union, Apple Pay, Google Pay, Afterpay (Clearpay), Klarna, and Trade Assurance.
For full orders: 30% deposit, balance before shipment.
For small/sample orders: full payment in advance.
6.How will you deliver my goods?
We offer flexible shipping options: DHL, UPS, FedEx, TNT, EMS, as well as air or sea freight.
All deliveries ensure door-to-door fast and safe service.
7.How do you inspect and guarantee your products?
All products are tested before shipment to ensure perfect working condition.
We offer a 12-month warranty — if a product fails due to quality issues, we provide free spare parts or repair support.
8.What about after-sales service?
If you encounter any problem during use, please contact your sales manager or our support team at any time.
We will respond quickly and help solve the issue efficiently.
9.What are your main applications?
- Hydraulic systems
- Agricultural machinery
- Construction machinery
- Automobile industry
- Local distributors and maintenance centers
10.Can I get a discount for bulk orders?
Yes. We offer competitive wholesale prices and try our best to give benefits to long-term partners.
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