PVF-20-35-10S Nachi Variable Vane Pump | 3.5 MPa

Product Overview:

Engineered for precision machine tools, injection molding equipment, and industrial hydraulic systems, the PVF-20-35-10S variable displacement vane pump (part of the comprehensive PVF-12/15/20/30/40/45 series) delivers exceptional energy efficiency and ultra-low noise performance. Built with a high-strength cast iron housing and precision-machined flow distribution plates, this series ensures precise flow control and steady pressure output. Backed by 100% simulated operating condition testing, it offers direct drop-in interchangeability with original Nachi PVF series pumps, providing an optimal solution for system upgrading and maintenance cost reduction.

Technical Specifications

• Model Code: PVF-20-35-10S (Covers full series PVF-12/15/20/30/40/45)

• Displacement: 20 ml/rev (Series spans from 12 ml/rev to 45 ml/rev)

• Rated Pressure: 3.5 MPa (35 kgf/cm², corresponding to the -35 code; -55 [5.5 MPa] and -70 [7.0 MPa] variants available)

• Max Peak Pressure: 4.2 MPa

• Speed Range: 800 – 1800 RPM

• Control Type: Pressure compensation / manual variable displacement control

• Volumetric Efficiency: ≥ 90% at rated operating conditions

• Drive Shaft: Standard straight shaft with parallel key

• Rotation: Clockwise (viewed from shaft end, standard right-hand rotation)

• Recommended Oil Viscosity: 20 – 68 cSt

• Filtration Requirement: 25 microns (μm)

Key Technical Advantages:

• Advanced Variable Mechanism: Features a responsive pressure-feedback variable design that automatically adjusts displacement based on load demands, cutting overflow losses and reducing overall energy consumption by 20% to 30%.

• Low Noise & Smooth Operation: Optimized suction/discharge port geometry and precision valve plates effectively suppress pressure pulsations, delivering significantly quieter operation than standard gear or fixed vane pumps.

• True OEM Interchangeability: Mounting dimensions, pilot diameters, shaft sizes, and port locations precisely match original factory specifications, allowing instant drop-in replacement without piping modifications.

• 100% Simulated Operating Tests: Every pump undergoes rigorous full-load pressure, flow response, and thermal cycling tests on automated test benches prior to delivery, ensuring zero-defect installation.

Application Areas:

• Metal Cutting Machine Tools: Clamping and feeding hydraulic circuits in lathes, milling machines, and drilling centers.

• Plastic Injection Molding Machinery: Auxiliary hydraulic loops in compact injection and blow-molding machines.

• Light Industry & Textile Machinery: Presses, packaging equipment, and automated hydraulic power packs.

• Footwear & Rubber Machinery: Hydraulic pressure power sources for molding and shaping presses.

Expert Maintenance Tips:

• Pre-Startup Priming: Prior to initial startup, completely fill the pump housing with clean hydraulic oil through the port/drain hole. Dry running is strictly prohibited to prevent scuffing of vanes and the cam ring.

• Fluid Cleanliness Control: Hydraulic oil contamination is the primary cause of vane sticking and plate scoring. Maintain oil cleanliness within NAS Grade 9 (ISO 18/15/12) and service filter elements regularly.

• Thermal Management: Keep system oil temperature between 15°C and 65°C. Excessive oil temperatures reduce viscosity and destroy the lubricating film, impairing variable response and shortening operational lifespan.