Parameter Description of YUKEN Piston Pump A37-FR04BK-32

1. Model Code Explanation

• A37: Series identifier, representing the A-series variable displacement piston pump with a basic displacement specification of 36.9 cm³/rev (medium-displacement type for medium-duty industrial applications).
• F: Mounting type, indicating flange mounting (standard medium-duty flange configuration, suitable for medium-scale equipment installation and stable operation).
• R: Rotation direction, meaning clockwise rotation when viewed from the shaft end (standard rotation direction for YUKEN A-series medium-displacement pumps).
• 04BK: Control type, referring to pressure-compensated variable control with built-in relief valve, which can automatically adjust displacement according to system pressure changes, and the BK code indicates optimized seal structure and pressure adaptation design for medium-pressure working conditions.
• 32: Standard design number, corresponding to the standard configuration of the pump, matching the medium-duty industrial application requirements and ensuring good compatibility with medium-sized hydraulic systems.

2. Core Technical Parameters

3. Control and Adjustment Parameters

• Control Mode: Pressure-compensated variable control with built-in relief valve (Model 04BK), which can automatically reduce displacement when the system pressure reaches the set value, maintain stable system pressure, and the built-in relief valve can prevent overpressure damage to the pump and hydraulic system.
• Pressure Adjustment: The pressure compensation range is 1.2-16 MPa; turning the pressure adjustment screw clockwise increases the set pressure, and the adjustment accuracy is ±0.3 MPa, which can be flexibly adjusted according to the actual working pressure requirements of the system.
• Flow Adjustment: Realized through pressure compensation control; the minimum adjustable flow is 3.0 cm³/rev, and the flow adjustment response time is ≤40ms, which can quickly adapt to the pressure and flow changes of medium-sized hydraulic systems.

4. Installation and Piping Requirements

• Mounting Type: Flange mounting (Model F), the mounting surface should be kept flat and clean, and the mounting bolts should be evenly tightened; it is recommended to use shock-absorbing gaskets to reduce vibration and noise during the pump’s medium-duty operation.
• Shaft Alignment: It is recommended to use a medium-sized flexible coupling to avoid bending or thrust stress on the shaft; the maximum permissible misalignment is less than 0.1 mm TIR, and the maximum permissible misangular is less than 0.2°.
• Piping Specifications: The inner diameter of the suction port pipe should be not less than 22 mm (7/8 inch) to ensure sufficient oil supply; the length of the drain pipe should be less than 1.0 m, and the pipe end should be submerged in oil; the pressure in the pump housing should be maintained at a normal pressure of less than 0.1 MPa and a surge pressure of less than 0.5 MPa.

5. Application Notes