Product Overview
The VPKC Series and VPKCC Series, manufactured by KCL (Kai Jia, Taiwan), are variable displacement vane pump product lines widely used in various industrial hydraulic systems requiring low noise and high efficiency. VPKC is a single variable vane pump, while VPKCC is a double variable vane pump. The series covers displacement ranges from 8 to 40 cc/rev, with maximum operating pressure up to 21 MPa (210 bar).
The VPKC/VPKCC Series features a hydraulically balanced intra-vane (sub-vane) structure design, providing automatic flow adjustment and compensation function at set pressure. Compared to fixed displacement vane pumps, this series offers lower power loss, reduced heat generation, and superior energy efficiency. The series is specially designed for high pressure and low noise, particularly suitable for plastic injection molding machines, rubber machinery, packaging machinery, woodworking machinery, and various machine tools.
Our products are manufactured to be 100% interchangeable with KCL original specifications—a true “drop-in” replacement solution. Every unit undergoes 100% full-load and flow-matching testing under simulated operating conditions before shipment, ensuring volumetric efficiency, flow rate, and noise performance meet or exceed original specifications at rated pressure.
Technical Specifications
VPKC-F-40-A4
Product Type: Variable Displacement Vane Pump
Brand: KCL (Kai Jia, Taiwan)
Series: VPKC
Geometric Displacement: 40 cc/rev
Rated Continuous Pressure: 21 MPa (210 bar)
Pressure Adjustment Range: A4 = 5.0 – 7.0 MPa (50–70 bar)
Maximum Flow (@1800 rpm): Approx. 33.3 L/min
Speed Range: 800 – 1800 r/min
Mounting Type: F = Flange Mounting
Shaft Type: Semi-circular keyed shaft (standard)
Rotation: Clockwise (standard, viewed from shaft end), counter-clockwise customizable
Fluid Compatibility: Petroleum-based hydraulic oil (ISO VG32 recommended)
Operating Temperature: 15–60°C continuous
Drain Line Back Pressure: Must be maintained below 0.3 bar
Inlet Pressure: -0.3 bar to 0.3 bar
VPKC-F15-A4-02-1
Product Type: Variable Displacement Vane Pump
Brand: KCL (Kai Jia, Taiwan)
Series: VPKC
Geometric Displacement: 15 cc/rev
Rated Continuous Pressure: 21 MPa (210 bar)
Pressure Adjustment Range: A4 = 5.0 – 7.0 MPa (50–70 bar)
Maximum Flow (@1800 rpm): Approx. 12.5 L/min
Speed Range: 800 – 1800 r/min
Mounting Type: F = Flange Mounting
Shaft Type: 02 = Splined Shaft
Suffix Code: -1
Rotation: Clockwise (standard, viewed from shaft end), counter-clockwise customizable
Fluid Compatibility: Petroleum-based hydraulic oil (ISO VG32 recommended)
Operating Temperature: 15–60°C continuous
Drain Line Back Pressure: Must be maintained below 0.3 bar
Inlet Pressure: -0.3 bar to 0.3 bar
VPKC-F40-A4-D
Product Type: Variable Displacement Vane Pump
Brand: KCL (Kai Jia, Taiwan)
Series: VPKC
Geometric Displacement: 40 cc/rev
Rated Continuous Pressure: 21 MPa (210 bar)
Pressure Adjustment Range: A4 = 5.0 – 7.0 MPa (50–70 bar)
Maximum Flow (@1800 rpm): Approx. 33.3 L/min
Speed Range: 800 – 1800 r/min
Mounting Type: F = Flange Mounting
Shaft Type: D = Special configuration (different from standard keyed or splined)
Rotation: Clockwise (standard, viewed from shaft end), counter-clockwise customizable
Fluid Compatibility: Petroleum-based hydraulic oil (ISO VG32 recommended)
Operating Temperature: 15–60°C continuous
Drain Line Back Pressure: Must be maintained below 0.3 bar
Inlet Pressure: -0.3 bar to 0.3 bar
VPKCC-F4040-A3A3
Product Type: Double Variable Displacement Vane Pump
Brand: KCL (Kai Jia, Taiwan)
Series: VPKCC
Section 1 Displacement: 40 cc/rev
Section 2 Displacement: 40 cc/rev
Total Displacement: 80 cc/rev (40 + 40)
Rated Continuous Pressure: 21 MPa (210 bar)
Pressure Adjustment Range: A3 = 3.0 – 5.5 MPa (30–55 bar)
Maximum Flow (@1800 rpm, per section): Approx. 33.3 L/min
Speed Range: 800 – 1800 r/min
Mounting Type: Flange Mounting
Rotation: Clockwise (standard, viewed from shaft end)
Material: Cast iron
Fluid Compatibility: Petroleum-based hydraulic oil (ISO VG32 recommended)
Operating Temperature: 15–60°C continuous
Drain Line Back Pressure: Must be maintained below 0.3 bar
Inlet Pressure: -0.3 bar to 0.3 bar
Key Technical Advantages
1. Hydraulically Balanced Intra-Vane Structure – High-Pressure Stability, Minimal Leakage
The VPKC/VPKCC Series features a hydraulically balanced intra-vane (sub-vane) structure design. The main vane and sub-vane combination directs high pressure to the vane bottom, keeping vanes tightly against the stator inner wall. This ensures optimal vane-to-stator contact and minimizes internal leakage, maintaining exceptionally high volumetric efficiency even under high-pressure conditions. Maximum operating pressure reaches 21 MPa (210 bar).
2. Floating Side Plate Structure – Automatic Clearance Compensation
The VPKC/VPKCC Series features a floating side plate structure that automatically compensates for clearance, achieving pressure balance and delivering superior high-speed, high-pressure performance. The side plates are manufactured from bimetallic flexible materials, significantly improving anti-seizure performance for higher pump efficiency and longer service life.
3. Variable Energy-Saving Design – Significantly Reduced Power Loss
The VPKC/VPKCC Series features a variable vane pump design that automatically adjusts flow and provides compensation at set pressure. Compared to fixed displacement vane pumps, this series offers lower power loss, reduced heat generation, and superior energy efficiency.
4. Low Noise and Stable Flow Output
The VPKC/VPKCC Series is specially designed for low noise, providing smooth and quiet operation. The low-noise and stable flow output characteristics make them widely used in machine tools, injection molding machines, die-casting machines, and construction machinery.
5. Double Pump Design – Single Power Source, Dual-Circuit Independent Control
The VPKCC Series integrates two pump sections into one housing driven by a single shaft. This design allows a single motor to simultaneously serve two independent hydraulic circuits, generating two different pressure flows. The double pump is driven by one motor, reducing installation space, and is compatible with direct-coupled motors for easy assembly.
6. Wide Pressure Adjustment Range for Flexible Adaptation
The VPKC/VPKCC Series offers four pressure adjustment ranges—A1 (0.8–2.0 MPa), A2 (1.5–3.5 MPa), A3 (3.0–5.5 MPa), and A4 (5.0–7.0 MPa). Users can flexibly select based on actual system pressure requirements.
7. 100% Drop-In Interchangeability – Zero Retrofit Cost
Manufactured to exact KCL original specifications—mounting dimensions, port locations, and shaft configurations are identical to the original. No piping modifications or installation adapters are required for direct replacement.
Application Areas
Plastic Injection Molding Machines: VPKC/VPKCC Series particularly suitable for plastic injection molding machines
Rubber Machinery: Foaming machines, flat vulcanization presses, etc.
Packaging Machinery: Hydraulic systems for various packaging equipment
Woodworking Machinery: Cutting machines, etc.
Hydraulic Presses: Various hydraulic press systems
CNC Machine Tools & Machining Centers: Smooth hydraulic power for precision numerical control systems
Small Hydraulic Power Units: Indoor hydraulic stations requiring energy-efficient operation
Automation Equipment: Light-medium industrial hydraulic systems
Dual-Circuit Systems: VPKCC double pumps ideally suited for equipment requiring simultaneous operation of two independent hydraulic circuits
Expert Maintenance Tips
1. Model Identification and Selection
VPKC Series: Single variable vane pump. In model VPKC-F-40-A4: F = Flange mounting, 40 = 40 cc/rev displacement, A4 = 5.0–7.0 MPa pressure range.
VPKC-F15-A4-02-1: 15 = 15 cc/rev displacement, A4 = Pressure range, 02 = Splined shaft, -1 = Version number.
VPKC-F40-A4-D: 40 = 40 cc/rev displacement, A4 = Pressure range, D = Special configuration.
VPKCC-F4040-A3A3: Double variable pump, both sections 40 cc/rev, both sections pressure grade A3.
Pressure Code Reference: A1 = 0.8–2.0 MPa (8–20 bar), A2 = 1.5–3.5 MPa (15–35 bar), A3 = 3.0–5.5 MPa (30–55 bar), A4 = 5.0–7.0 MPa (50–70 bar).
Shaft Code: 01 = Semi-circular keyed shaft, 02 = Splined shaft.
2. Installation Precautions
Verify pump rotation direction matches system requirements—standard is clockwise (viewed from shaft end); counter-clockwise is special order.
Ensure shaft alignment error between pump and motor is within 0.05 mm, and angular error within 1°.
Suction piping should be as short as possible, minimizing unnecessary restrictions.
The pump housing must not bear piping loads; suction and discharge lines must have independent supports.
3. Pre-Startup Checklist
For new pumps, jog the motor repeatedly under no-load conditions to purge air from the pump and suction line.
Run continuously for 10 minutes under no-load to ensure complete air removal from the system.
Fill the pump housing with clean hydraulic oil; confirm correct fluid type (ISO VG32 recommended).
Never operate dry—this will immediately damage internal components.
4. Fluid Management
Hydraulic oil with viscosity 30–50 cSt at 40°C (ISO VG32) is recommended.
The drain line must be routed directly back to the reservoir below the oil level; back pressure must be maintained below 0.3 bar.
Recommended continuous operating temperature: 15–60°C.
Inlet pressure should be maintained between -0.3 bar and 0.3 bar.
Fluid cleanliness is critical—maintain at NAS 9 or higher.
5. Scheduled Maintenance
Replace hydraulic oil and filters every 2000 operating hours or annually.
VPKC/VPKCC Series feature cartridge-type construction—cartridges can be replaced independently.
Pressure Adjustment: Turn the pressure adjustment screw clockwise to decrease output pressure; counter-clockwise to increase.
Flow Adjustment: Loosen the adjustment nut, then turn the adjustment screw—clockwise reduces flow, counter-clockwise increases flow. Tighten the nut after adjustment.
