P21V-RSG-11 P21VMR-10 Tokyo Keiki Piston Pump 21MPa

Product Overview

The P21VMR-10-CMC-20-S121B-J, P21V-RSG-11-CCG-10-J, P16V-RSG-11-CC-10-J, and P21V-RSG-11-CVC-10-J are core models within the Tokyo Keiki (formerly TOKIMEC) PV series of swashplate-type variable displacement axial piston pumps. The PV series is Tokyo Keiki’s flagship product platform in industrial hydraulics, spanning displacements from 8 to 130 cm³/rev across seven sizes, with a rated pressure of 21 MPa, intermittent peak pressure of 25 MPa, and maximum speed of 1800 rpm, renowned for low noise, high efficiency, high response, and extensive control options.

The P**V series employs a swashplate-type variable axial piston pump structure where pump output flow is proportional to drive speed and displacement, with output flow steplessly variable via swashplate angle adjustment. The series is widely used in machine tools, injection molding machines, presses, construction machinery, and general industrial hydraulic systems.

PV Series Core Features:** Low noise — approximately 68.5 dB(A) at 21 MPa and 1800 min⁻¹; high efficiency — volumetric efficiency approximately 95%, overall efficiency approximately 90%; fast response and high stability; extensive control functions — pressure compensator control, load sensing control, dual-pressure/dual-flow control, and electronic proportional control; compact lightweight design; high power-to-weight ratio; combinable with function valves for pulsation attenuation, simplifying hydraulic circuits.

Model Code Breakdown (for procurement and engineering reference):

Using P21V-RSG-11-CCG-10-J as example:

• P21V: P**V series, nominal size 21, geometric displacement 21 cm³/rev

• R: Rotation direction, right-hand (clockwise, viewed from shaft end)

• S: Displacement type, one side of center

• G: Port connection, SAE 4-bolt flange

• 11: Design series number

• CCG: Control type. C = pressure compensator (1.5–21 MPa); second C = with maximum displacement adjustment; G = remote pressure compensator

• 10: Control valve design number

• J: Standard specification

Using P21VMR-10-CMC-20-S121B-J as example:

• P21VMR: P**V series, R = right-hand rotation, M = lightweight small housing version

• 10: Design series number

• CMC: Control type. C = pressure compensator; M = with maximum displacement adjustment; C = solenoid-controlled two-pressure compensator

• 20: Mounting version

• S121B: Shaft and port configuration code

• J: Standard specification

Using P16V-RSG-11-CC-10-J as example:

• P16V: Nominal size 16, geometric displacement 16 cm³/rev

• CC: Pressure compensator control (1.5–21 MPa) with maximum displacement adjustment

• 10: Control valve design number

Using P21V-RSG-11-CVC-10-J as example:

• CVC: C = pressure compensator; V = load sensing control; third C = with maximum displacement adjustment

• This configuration provides combined pressure compensator + load sensing control

CMC Control Function Details: CMC is a Solenoid-Controlled Two-Pressure Compensator, with a solenoid valve integrated directly on the pump’s compensator, allowing the operator to switch between two different pressure compensation settings via an electrical signal. This function is particularly suitable for machine tool applications requiring a “high-low” pressure cycle, such as fast approach at low pressure followed by a high-pressure work stroke, reducing external valving complexity and enabling faster cycle times.

CCG Control Function Details: CCG is a Remote Pressure Compensator, enabling remote adjustment of the pump’s pressure compensation setting via an external pilot valve, suitable for complex hydraulic systems requiring real-time system pressure adjustment based on operating conditions.

CVC Control Function Details: CVC is a combined Pressure Compensator + Load Sensing control. Load sensing control automatically adjusts pump displacement by sensing the pressure differential across a throttle valve for on-demand flow delivery; the pressure compensator maintains constant pressure output when system pressure reaches the setpoint. This combined control method offers significant advantages in machine tools and injection molding machines requiring precise flow control.

Drop-in Replacement Advantage: Manufactured to exact Tokyo Keiki OEM specifications, these pumps achieve complete drop-in interchangeability with the original P**V series for SAE 4-bolt mounting flange, shaft dimensions, SAE standard port layout, and control module interface. Every pump undergoes 100% simulated load testing prior to shipment, validating 21 MPa pressure loading, control response, and volumetric efficiency under conditions replicating real-world duty cycles.

Technical Specifications

P21V Series General Specifications:

• Series: Tokyo Keiki P**V Series (Swashplate-Type Variable Axial Piston Pump)

• Nominal Size: P21V

• Geometric Displacement: 21 cm³/rev

• Rated Pressure: 21 MPa (210 bar / 3045 psi)

• Intermittent Peak Pressure: 25 MPa (250 bar / 3625 psi)

• Maximum Speed: 1800 rpm

• Minimum Speed: 600 rpm

• Theoretical Flow at 1800 rpm: 37.8 L/min

• Volumetric Efficiency: Approx. 95%

• Overall Efficiency: Approx. 90%

• Noise Level: Approx. 68.5 dB(A) @ 21 MPa / 1800 rpm

• Weight (Flange Mount): 18–23 kg (per configuration)

• Mounting: Flange mount (standard), optional foot bracket (F suffix)

• Shaft: Straight keyed or splined shaft

• Port Connections: SAE O-ring seal or SAE 4-bolt flange (G code)

• Housing Material: High-strength cast iron

• Seal Material: NBR (nitrile rubber), suitable for mineral oil-based hydraulic fluid

• Working Fluid: ISO VG32/46/68 mineral hydraulic oil

• Recommended Viscosity: 20–100 mm²/s

• Operating Temperature: -10°C to +80°C (optimum 40–50°C)

• Fluid Cleanliness: ISO 4406 18/15 or better

P21VMR-10-CMC-20-S121B-J:

• Model Code: P21VMR-10-CMC-20-S121B-J

• Control Type: CMC — Solenoid-Controlled Two-Pressure Compensator

• Rotation: Right-hand (clockwise, viewed from shaft end)

• Displacement: 21 cm³/rev

• Rated Pressure: 21 MPa

• Maximum Speed: 1800 rpm

• Minimum Speed: 600 rpm

P21V-RSG-11-CCG-10-J:

• Model Code: P21V-RSG-11-CCG-10-J

• Control Type: CCG — Remote Pressure Compensator (with maximum displacement adjustment)

• Rotation: Right-hand (clockwise)

• Displacement: 21 cm³/rev

• Rated Pressure: 21 MPa

• Maximum Speed: 1800 rpm

P16V-RSG-11-CC-10-J:

• Model Code: P16V-RSG-11-CC-10-J

• Control Type: CC — Pressure Compensator Control (1.5–21 MPa) with maximum displacement adjustment

• Rotation: Right-hand (clockwise)

• Displacement: 16 cm³/rev

• Rated Pressure: 21 MPa

• Maximum Speed: 1800 rpm

P21V-RSG-11-CVC-10-J:

• Model Code: P21V-RSG-11-CVC-10-J

• Control Type: CVC — Pressure Compensator + Load Sensing Control

• Rotation: Right-hand (clockwise)

• Displacement: 21 cm³/rev

• Rated Pressure: 21 MPa

• Maximum Speed: 1800 rpm

PV Series Displacement Size Reference:**

• P16V: 16 cm³/rev, rated 21 MPa, peak 25 MPa, max speed 1800 rpm, weight 16 kg

• P21V: 21 cm³/rev, rated 21 MPa, peak 25 MPa, max speed 1800 rpm, weight 23 kg

• P31V: 31 cm³/rev, rated 21 MPa, peak 25 MPa, max speed 1800 rpm, weight 23 kg

• P40V: 40 cm³/rev, rated 21 MPa, peak 25 MPa, max speed 1800 rpm, weight 37 kg

• P70V: 70 cm³/rev, rated 21 MPa, peak 25 MPa, max speed 1800 rpm, weight 63 kg

• P100V: 100 cm³/rev, rated 21 MPa, peak 25 MPa, max speed 1800 rpm, weight 91 kg

• P130V: 130 cm³/rev, rated 21 MPa, peak 25 MPa, max speed 1800 rpm, weight 112 kg

Key Technical Advantages

1. Low Noise Design with Silent Operation Across Full Pressure Range
The PV series features low noise operation as a core design characteristic. At 21 MPa pressure and 1800 min⁻¹ speed, the noise level is approximately 68.5 dB(A). The series employs special design to maintain low noise performance across the entire pressure range, with optimized internal fluid passages and high-rigidity housing structure maintaining low acoustic levels even during pressure compensation phases. This characteristic makes the PV series particularly suitable for machine tools and modern factory environments with strict noise control requirements.

2. Extensive Control Functions with Flexible Selection
The P**V series offers an industry-leading combination of control options, flexibly selectable via model codes:

• C: Pressure compensator control, adjustment range 1.5–21 MPa

• CM: Pressure compensator control, adjustment range 1.5–10.5 MPa

• CG: Remote pressure compensator control

• CV: Load sensing control

• 2P: Self-pressurized, 2-pressure/2-flow control

• EP: Proportional valve pressure compensator control

• CMC: Solenoid-controlled two-pressure compensator, switching between two pressure settings via electrical signal

3. High Efficiency with High Response
The P**V series features high volumetric efficiency (approximately 95%) and high overall efficiency (approximately 90%), effectively reducing energy consumption and system heat generation. The swashplate variable mechanism features short response times, with control spool and servo piston area ratios and spring rates precisely matched to ensure fast and stable displacement adjustment. The series is suitable for machine tools, injection molding machines, and other industrial hydraulic systems requiring rapid response.

4. Integrated Function Valves with System Simplification
The P**V series can be combined with various function valves mounted on the output port, providing a capacitor-like function to reduce pulsation, thereby simplifying hydraulic circuits and reducing noise. Modular control designs enable field conversion and upgrade, with standardized SAE mounting flange and shaft requiring no adaptation for replacement.

5. High Power-to-Weight Ratio with Compact Design
The P**V series is renowned for compact lightweight design. The P21V achieves a displacement of 21 cm³/rev with a weight of only approximately 23 kg, offering an excellent power-to-weight ratio. The compact axial dimensions make it particularly suitable for space-constrained industrial hydraulic applications. Tandem pump configurations are available for complex hydraulic systems with multi-circuit requirements.

6. Wide Hydraulic Fluid Compatibility with Stable Operation
The P**V series is compatible with ISO VG32/46/68 mineral hydraulic oils, with a recommended viscosity range of 20–100 mm²/s and an optimum oil temperature of 40–50°C. Water-glycol and phosphate ester fire-resistant fluids require special version pumps. The housing is precision-cast from high-strength cast iron, with pistons and cylinder bores precision match-ground to micron-level clearances, maintaining stable volumetric and mechanical efficiency at 21 MPa continuous pressure.

Application Areas

• Machine Tools: CNC machine hydraulic systems, hydraulic fixtures, precision grinder hydraulic power sources (one of the core application areas for the P**V series)

• Injection Molding Machines: Clamp and injection hydraulic systems

• Pressing Equipment: Hydraulic presses, stamping equipment hydraulic power sources

• Steel Processing Equipment: Metallurgical equipment hydraulic systems, rolling mill hydraulic power sources

• Automation Machinery: Automated production line hydraulic actuators

• Construction Machinery: Mobile construction machinery hydraulic drive systems

• Industrial Hydraulic Power Units: Small to medium hydraulic power units, central oil supply systems

Expert Maintenance Tips

1. Hydraulic Fluid Cleanliness
The P**V series control spool operates with extremely tight clearances and is highly sensitive to particulate contamination. System fluid cleanliness must meet ISO 4406 18/15 or better. Recommended fluids are ISO VG32, VG46, or VG68 anti-wear mineral hydraulic oils with a recommended viscosity range of 20–100 mm²/s. Install a 10 μm absolute-rated filter element at the pump inlet. Replace elements at 500 hours after first commissioning, then every 1,000 operating hours or 6 months, whichever comes first.

2. CMC Solenoid Controller Maintenance
The P21VMR-10-CMC-20-S121B-J is equipped with a CMC solenoid-controlled two-pressure compensator. Regularly inspect the solenoid electrical connectors for looseness, moisture, or corrosion. CMC control allows switching between two pressure settings via electrical signal, suitable for machine tool applications requiring high-low pressure cycles. Check solenoid coil resistance and response every 2,000 operating hours to confirm proper pressure switching function.

3. CCG Remote Pressure Compensator Commissioning
The P21V-RSG-11-CCG-10-J remote pressure compensator (CCG) enables remote pressure adjustment via an external pilot valve. During commissioning, confirm correct pilot valve piping connection and stable pilot pressure signal. The CCG controller’s pressure adjustment range covers 1.5–21 MPa; set the value according to actual system requirements. Adjust only with the system at zero load. Rotate the adjustment screw slowly.

4. CVC Load Sensing Controller Commissioning
The P21V-RSG-11-CVC-10-J CVC composite controller includes both pressure compensator and load sensing functions. During commissioning, first set the pressure compensator pressure cut-off value, then adjust the load sensing valve differential pressure setting. The load sensing differential pressure setting must be matched to system throttle valve characteristics to ensure flow control accuracy. Adjust only with the system at zero load.

5. Case Drain Line Requirements
The case drain line must return directly to the reservoir. Maximum permissible back pressure is 0.1 MPa. The drain outlet must terminate below oil level at all times to prevent air ingestion. The drain line diameter must not be smaller than the pump case drain port size. For P**V series pumps, drain line design should ensure stable case pressure.

6. Pre-Start Priming and Air Bleeding
Before first start, fill the pump housing with clean hydraulic fluid through the case drain port. After installation, turn the drive shaft by hand several revolutions to confirm free rotation without binding. Position the control at neutral (zero displacement) and run at low speed for 5–10 minutes. Verify continuous bubble-free flow from the case drain. Only then apply load. Minimum speed must not fall below 600 rpm; below this speed, insufficient suction causes significant volumetric efficiency loss.