Parameters of NACHI Variable Displacement Vane Pump VDR-1B-1A3-22

1. Basic Information

• Model: VDR-1B-1A3-22
• Product Type: Variable Displacement Single Vane Pump
• Series: VDR 22 Design Series
• Mounting Method: Flange Type Mount (Code “B”)
• Design Number: 22 (Note: The change from design number 21 to 22 represents a change in the shaft key width from 0.125 in to 0.187 in)
• Pump/Head Side Size: 1
• Ring/Head Ring Size: 1
• Flow Characteristics: Constant Discharge Rate Type (Code “A”)

2. Technical Parameters

3. Performance Characteristics

• Stable and highly efficient operation up to 10.5 MPa (1522 psi), with a biased piston that minimizes ring vibration and leak-free pressure balance construction for reliable medium-high pressure performance。
• High-precision instantaneous response, improved by a special bias piston mechanism that ensures prompt response at both on-off and off-on operations, enabling stable and accurate work[3]。
• Silent operation even in the medium-high pressure range, thanks to quiet journal bearings, a 3-point support system from the bias piston, and optimized suction/discharge port shapes that reduce operational noise significantly。
• Reduced power loss, especially at full cutoff, achieved through NACHI original mechanical innovations and precision machining techniques[2]。
• Solid and durable construction, made with high-quality materials and exquisite craftsmanship, suitable for harsh operating conditions and ensuring long service life[3]。
• Compact structure that facilitates easy installation and daily maintenance, adapting to various industrial hydraulic system configurations。

4. Notes

• When the ring size is Code “2”, the maximum setting pressure is 7 MPa (71.4 kgf/cm²; 1015 psi)。
• The discharge rate provided is the no-load value measured at 1800 min⁻¹。
• When using a 0.125 in key coupling, additional accessories are required due to the shaft key width change of design number 22。
• Under full cutoff continuous operation, the oil temperature limit is room temperature +25°C (with the tank in a well-ventilated area)。
• The pump is specifically designed for reliable performance in various industrial hydraulic systems, ensuring stable operation under different working conditions。