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vickers hydraulic pump parts

更新时间：2026-04-21 15:03:13

This document details the key parts of Vickers hydraulic pumps, focusing on axial piston pumps (the main type, including PVQ/PVH/PVM/PVXS series) and supplementing with vane pump parts (VQ series).

I. Core Parts of Axial Piston Pumps (PVQ/PVH/PVM/PVXS Series)

1. Main Motion & Power Transmission Components

Part Name	Key Function	Applicable Series
Drive Shaft	Transmits power from the motor to drive the cylinder block to rotate; connects to the pump's input coupling to ensure stable power transmission.	All axial piston series
Cylinder Block (Barrel)	Rotates synchronously with the drive shaft; is equipped with multiple plunger bores to accommodate plungers and realize reciprocating suction and discharge of oil.	All axial piston series
Plunger Assembly (Plunger + Shoe)	Converts the rotational motion of the cylinder block into linear reciprocating motion; the shoe is closely attached to the swashplate, and the stroke is adjusted with the inclination of the swashplate to change the pump displacement.	All axial piston series
Swashplate	A fixed inclined plate that determines the stroke of the plunger; the adjustment of the inclination angle directly controls the displacement of the pump, which is the core component of variable displacement control.	All axial piston series
Valve Plate (Port Plate)	Separates the high-pressure and low-pressure oil circuits of the pump; its oil ports are accurately aligned with the plunger bores of the cylinder block to ensure smooth suction and discharge of oil without mutual interference.	All axial piston series
Retainer Plate	Provides preload for the plunger assembly, ensuring that the shoe is always in close contact with the swashplate during the rotation of the cylinder block, avoiding idle operation and wear.	All axial piston series

2. Pressure Compensation & Control Components

Part Name	Key Function	Applicable Series
Pressure Compensator Assembly	The core component of pressure control; adjusts the inclination angle of the swashplate according to the change of system pressure to maintain constant system pressure and realize energy-saving operation.	All axial piston series (standard configuration)
Compensator Spool	Responds to system pressure changes; when the pressure reaches the set value, it moves to push the stroke cylinder, thereby adjusting the swashplate angle and reducing the pump displacement.	All axial piston series
Compensator Spring	Provides biasing force to reset the compensator spool; the elastic force determines the pressure cut-out point of the pump, ensuring stable pressure control.	All axial piston series
Stroke Cylinder	Actuates the swashplate to adjust its inclination angle through hydraulic or pneumatic pressure, converting the control signal of the compensator into mechanical motion.	All axial piston series
Load Sensing Valve (Optional)	Optimizes the pump output flow by detecting the load demand of the system, making the pump output match the actual load, further improving energy efficiency.	PVXS/PVM series (optional configuration)

3. Housing, Sealing & Mounting Components

Part Name	Key Function	Material/Feature
Pump Body/Housing	Supports all internal components, forms the oil storage cavity, and ensures the overall structural strength and tightness of the pump.	Aluminum alloy (light series) or cast iron (heavy-duty series)
Front/Rear End Cover	Seals the pump housing, integrates oil inlet and outlet ports, and installs bearings to support the drive shaft for stable rotation.	Integrated with sealing grooves for O-rings
Tie Rod	Clamps the pump body, front and rear end covers, and core components together to ensure the integrity of the pump structure under high pressure.	High-strength steel, with standardized thread specifications
Shaft Seal	Prevents hydraulic oil from leaking from the drive shaft end and prevents external contaminants (dust, debris) from entering the pump interior.	Oil-resistant rubber or polytetrafluoroethylene (PTFE) material
O-Ring/Sealing Ring	Seals the joint surfaces (pump body, end cover, oil port, etc.) to avoid oil leakage and ensure the tightness of the hydraulic system.	Nitrile rubber (NBR) or fluorine rubber (FKM) for high temperature and pressure resistance
Flange/Mounting Base	Provides a standardized mounting interface for the pump to be connected with the equipment, ensuring accurate installation and stable operation.	Complies with international mounting standards (ISO)

4. Auxiliary & Wear Components

Part Name	Key Function	Maintenance Note
Bearing	Supports rotating components such as the drive shaft and cylinder block, reduces friction during rotation, and ensures smooth operation of the pump.	Regularly check lubrication and wear status
Integral Filter	Filters the oil entering the pump, removes impurities and contaminants, and protects precision components such as plungers and valve plates from wear.	Clean or replace regularly to maintain filtering efficiency
Drain Plug	Facilitates oil drainage during pump maintenance and oil change, ensuring that waste oil is completely discharged.	Tighten after oil change to avoid leakage
Oil Level Gauge	Monitors the oil level in the pump's integrated reservoir, facilitating timely oil replenishment and preventing insufficient lubrication.	Check regularly to ensure the oil level is within the standard range

II. Key Parts of Vane Pumps (VQ Series)

Part Name	Key Function	Special Feature
Rotor	The core rotating component; drives the vanes to slide in the slots, forming variable volume chambers to realize suction and discharge of oil.	Evenly distributed vane slots, high precision machining
Vane	Slides back and forth in the rotor slots under the action of centrifugal force and oil pressure, closely attached to the inner surface of the stator to form a sealed cavity.	Wear-resistant material, good elasticity
Stator	The fixed component with an eccentric inner surface; the shape of the inner surface determines the displacement of the vane pump and the stability of oil suction and discharge.	High hardness, wear-resistant surface treatment
Flexible Plate	Compensates for thermal expansion of components during pump operation, improves the sealing performance of the pump, and enhances cold-start performance.	Elastic material, adaptive to temperature changes
Vane Cartridge	A plug-in replacement component integrating rotor, vanes, and stator; it can be quickly replaced on site without removing the entire pump, improving maintenance efficiency.	Standardized design, easy to disassemble and assemble

III. Model-Specific Key Parts

1. PVQ Series (Compact Axial Piston Pump)

Miniature Compensator Spool: Smaller size, suitable for space-constrained installation scenarios, ensuring accurate pressure control.
Lightweight Aluminum Housing: Reduces the overall weight of the pump, suitable for light industrial equipment.
SE1S Control Interface: Standard configuration for pressure compensation, easy to connect with the control system.

2. PVH Series (Heavy-Duty Axial Piston Pump)

Modular Valve Block: Integrates multiple control valves (pressure compensation, flow control, etc.), with strong expandability and flexible configuration.
High-Pressure Plunger Pairs: Made of high-strength wear-resistant material, capable of withstanding continuous pressure up to 280 bar.
Dual-Compensator Option: Supports both pressure and flow compensation, suitable for complex working conditions with variable load and pressure.

3. PVM/PVXS Series (High-Precision Axial Piston Pump)

Load-Sensing Piston: Feeds back the system load pressure to the control mechanism, realizing precise matching of pump output and load demand.
Precision-Machined Swashplate: High machining accuracy, ensuring stable adjustment of displacement and improving the control precision of the pump.
Remote Pressure Adjustment Port: Allows external adjustment of the pump's set pressure without disassembling the pump, convenient for on-site debugging.

IV. Critical Wear Parts & Replacement Notes

Plunger & Shoe Assembly: Easily worn due to high-pressure sliding friction; when wear occurs, it will cause oil leakage and reduced pump efficiency, and must be replaced in pairs.
Valve Plate & Cylinder Block: The contact surface is easily worn due to long-term pressure cycling; replacement should also be done in pairs to ensure sealing performance.
Shaft Seal & O-Rings: Deteriorate due to long-term exposure to high temperature and hydraulic oil; regular inspection and replacement are required to avoid oil leakage.
Compensator Spool & Spring: Fatigue damage may occur due to repeated actuation; if the pressure control is unstable, check and replace these two parts first.
Vanes & Flexible Plates (Vane Pumps): Vanes are easily worn due to frequent sliding; flexible plates lose elasticity after long-term use, which needs to be replaced in time.

V. Maintenance Guidelines

Maintain Oil Cleanliness: The oil cleanliness should be controlled at NAS ≤ 6 to avoid contaminants damaging precision parts such as plungers and valve plates.
Standardized Replacement: Wear parts must be replaced in pairs to ensure the matching accuracy of components and avoid secondary damage.
Torque Control: When installing or maintaining, follow the specified torque values for tie rods, locknuts, and mounting bolts (e.g., the locknut torque of PVH series is 25–50 N·m).
Oil Temperature Control: The pump should operate within the temperature range of 30–60°C; excessive temperature will accelerate the aging of seals and components, reducing the service life of the pump.

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