DAIKIN variable piston pump V38 series parameters

1. Basic Specifications

• Model Series: V38 Series Variable Displacement Piston Pump

• Theoretical Displacement: 37.7 cm³/rev (2.30 in³/rev)

• Maximum Operating Pressure: 25 MPa (250 bar / 3500 psi)

• Permissible Rotational Speed Range: 500 - 1800 rpm (min - max)

• Direction of Rotation: Clockwise (R) or Counterclockwise (L), non-changeable; determined by model code

• Applicable Fluid: Petroleum-based hydraulic fluid (standard); optional water-glycol (W) or phosphate ester (F) hydraulic fluid (note: pressure adjustment range is limited for water-glycol fluid)

2. Performance Parameters

• Discharge Rate (at 1800 rpm): 34 - 68 L/min (9.0 - 17.96 GPM) for axial port; 36.5 - 68 L/min (9.64 - 17.96 GPM) for side port

• Pressure Adjustment Range: 0.8 - 25 MPa (8 - 250 bar / 115 - 3500 psi), specific range varies by control method

• Differential Pressure Limit: Maximum 10.3 bar (150 psi) when reverse flow occurs; throttling reverse flow may damage O-ring

• Noise Level: Low noise operation over the entire pressure range, a typical feature of DAIKIN V series pumps

• Efficiency: High efficiency with low power loss, reducing fluid temperature rise and enabling smaller tank design

3. Control Methods

• Pressure Compensator Control (Code: A): Mechanical adjustment; discharge rate automatically decreases to maintain preset pressure when discharge pressure approaches the set value

• Combination Control (Code: C): Multiple types available – pressure feedback method (Code: H), solenoid operated method (Code: J), pressure and displacement combination with system pressure (Code: CH), and pressure and displacement combination with solenoid valve (Code: CJ), enabling high-pressure low-flow and low-pressure high-flow control to reduce power consumption

• Dual Pressure Control (Code: D): Electrically switched, supporting two pressure settings for different working conditions

• Power-Match Control (Code: SA): Combines flow and pressure compensator control for optimized energy efficiency

• Remote Control Option (Code: RC): Available for certain control methods, enabling remote pressure adjustment via pilot relief valve

4. Installation & Dimensions

• Mounting Flange: SAE A or B 2-bolt standard

• Piping Direction: Axial port (standard) or side port (Code: X); optional suction port flange and discharge port taper pipe threads (Code: Y)

• Weight: 24.4 kg (53.8 lb) for axial port; 26 kg (57.3 lb) for side port

• Valve Orifice: No specific model-specific orifice data; refer to the official DAIKIN manual for detailed valve component specifications

5. Material Specifications (Valve Components)

• Valve Body: SS 316 (ASTM A479/A276) or Brass (ASTM B16)

• Plug: PTFE-coated SS 316 (ASTM A479/A276) or PTFE-coated Brass (ASTM B16)

• O-ring: PTFE-coated FKM; lubricant is silicone-based

• Handle & Pin: Nylon handle; SS 316 (ASTM A276) pin

6. Notes

• All dimensions are for reference only and subject to change; dimensions with DAIKIN nuts are in finger-tight position

• The design number is subject to change; refer to the official manual for forward/backward compatibility information

• Low oil heat generation, fast response times, high stability and repetition accuracy ensure high reliability and long service life, making it ideal for industrial open-loop circuit applications