MKV-11H MKV-23H Mitsubishi Axial Piston Pump 34.3MPa

Product Overview

The MKV-11H-RFA-P11-Q-11, MKV-23H-RFA-C10-LQ-11, and MKV-11A-RFA-X10-L11 are core models within the Mitsubishi Heavy Industries MKV series of swashplate-type variable displacement axial piston pumps. The MKV series is a high-performance hydraulic pump platform developed by Mitsubishi, leveraging nearly 60 years of pump manufacturing experience. With displacements ranging from 85 to 552 cm³/rev, a rated pressure of 34.3 MPa (343 bar), and a peak pressure of 39.2 MPa (392 bar), the series is renowned for high pressure and power density, superior self-priming performance, low noise, and a wide range of control options.

About the Mitsubishi MKV Series: Mitsubishi MKV series piston pumps are primarily used in main and auxiliary hydraulic systems of Mitsubishi Hitachi cold rolling mills, as well as in marine steering gear, windlasses, cranes, construction machinery, and industrial hydraulic systems. The series has extensive field-proven applications in the marine and steel industries. The MKV series is available in standard type (H), low pulsation type (NE/ME), and other variants, with optional configurations for phosphate ester, water-glycol, and other fire-resistant hydraulic fluids.

Model Code Breakdown (for procurement and engineering reference):

Using MKV-11H-RFA-P11-Q-11 as example:

• MKV: Mitsubishi MK series swashplate-type variable piston pump

• 11: Nominal size code, geometric displacement 117 cm³/rev

• H: Standard type (Normal type)

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

• F: Flange Mounting

• P11: Controller code — Constant Pressure Control, maintaining pressure at a set value by pressure control

• Q: Tilting Angle Indicator (standard equipment)

• 11: Straight Key Shaft

Using MKV-23H-RFA-C10-LQ-11 as example:

• MKV-23H: Nominal size 23, geometric displacement 229 cm³/rev, standard type

• C10: Controller code — Constant Power Control, with external adjustment screw for constant power approximation

• LQ: L = Bracket, Q = Tilting Angle Indicator

• 11: Straight Key Shaft

Using MKV-11A-RFA-X10-L11 as example:

• MKV-11A: Nominal size 11, geometric displacement 117 cm³/rev, A = One way discharge

• X10: Controller code

• L: Bracket

• 11: Straight Key Shaft

Controller Code System:

• C10: Constant Power Control — constant power is approximated with external adjustment screw

• P11: Constant Pressure Control — constant pressure is maintained at a set value by pressure control

• CG: Constant Power Control with Flow Controller

• CP: Constant Power Control with Pressure Cut-off

• A: Electric Motor Control

• D: Hand Wheel Control

• E: Electric/Hydraulic Servo Control

• L: Lever Servo Control

Drop-in Replacement Advantage: Manufactured to exact Mitsubishi OEM specifications, these pumps achieve complete drop-in interchangeability with the original MKV series for flange mounting dimensions, shaft specifications (straight keyed/external spline shaft), SAE standard port layout, and C10/P11 controller interface. Every pump undergoes 100% simulated load testing prior to shipment, validating 34.3 MPa pressure loading, constant power/pressure control response, and volumetric efficiency under conditions replicating real-world duty cycles.

Technical Specifications

MKV-11H Series General Specifications:

• Series: Mitsubishi MKV Series (Swashplate-Type Variable Axial Piston Pump)

• Nominal Size: 11

• Geometric Displacement: 117 cm³/rev

• Rated Pressure: 34.3 MPa (343 bar / 4975 psi)

• Maximum Pressure: 39.2 MPa (392 bar / 5685 psi)

• Rated Speed: 2250 rpm

• Maximum Speed: 2400 rpm (standard type)

• Maximum Flow: Approx. 248 L/min

• Rated Input Power: 159 kW

• Mass: Approx. 54 kg

• Rotation: Right-hand (R) or left-hand (L)

• Mounting: Flange Mounting (F)

• Shaft: Straight Key Shaft (11) or External Spline Shaft (31)

• Control Type: P11 Constant Pressure / C10 Constant Power / CG Constant Power + Flow / CP Constant Power + Pressure Cut-off

• Working Fluid: Petroleum-based hydraulic oil (standard), optional phosphate ester, water-glycol, fatty acid ester

MKV-23H Series General Specifications:

• Series: Mitsubishi MKV Series (Swashplate-Type Variable Axial Piston Pump)

• Nominal Size: 23

• Geometric Displacement: 229 cm³/rev

• Rated Pressure: 34.3 MPa (343 bar / 4975 psi)

• Maximum Pressure: 39.2 MPa (392 bar / 5685 psi)

• Rated Speed: 1800 rpm

• Maximum Speed: 1800 rpm

• Maximum Flow: Approx. 390 L/min

• Rated Input Power: Approx. 85 kW (with 85 kW motor system)

• Working Pressure (System): 24.5 MPa (245 bar)

• Mass: Approx. 80 kg

• Rotation: Right-hand (R) or left-hand (L)

• Mounting: Flange Mounting (F)

• Shaft: Straight Key Shaft (11)

• Control Type: C10 Constant Power Control / P11 Constant Pressure Control

• Working Fluid: Petroleum-based hydraulic oil (standard)

MKV Series Displacement Size Reference:

• MKV-08: 85 cm³/rev, rated 34.3 MPa, rated speed 2400 rpm, rated input 123 kW, mass 47 kg

• MKV-11: 117 cm³/rev, rated 34.3 MPa, rated speed 2250 rpm, rated input 159 kW, mass 54 kg

• MKV-16: 160 cm³/rev, rated 34.3 MPa, rated speed 2000 rpm, rated input 193 kW, mass 47 kg

• MKV-23: 229 cm³/rev, rated 34.3 MPa, rated speed 1800 rpm, rated input —, mass 80 kg

• MKV-28: 279 cm³/rev, rated 34.3 MPa, rated speed 1200 rpm, rated input —, mass —

• MKV-33: 333 cm³/rev, rated 34.3 MPa, rated speed 1200 rpm, rated input —, mass —

• MKV-55: 552 cm³/rev, rated 34.3 MPa, rated speed 1200 rpm, rated input —, mass —

Note: Data compiled from Mitsubishi Heavy Industries official model specification page and industry-published technical references. Rated input power data for MKV-08 through MKV-16 from official specification table; some parameters for MKV-23 through MKV-55 require confirmation based on specific configuration.

Key Technical Advantages

1. High Pressure and Power Density with Superior Output Capability
The MKV series operates at a rated pressure of 34.3 MPa with peak pressure up to 39.2 MPa, leading its displacement class. The MKV-11H delivers a flow of 248 L/min at 2250 rpm rated speed with rated input power of 159 kW. The compact flange-mount structure allows the pump to deliver high power output while maintaining a small installation envelope, particularly suitable for heavy-duty industrial applications such as marine steering gear and steel cold rolling mills requiring strict power density requirements.

2. High Self-Priming Performance with Excellent Suction Characteristics
The MKV series features superior high self-priming performance, with a self-priming value Cp of 1.1×10, where Cp = rpm × (flow rate)^1/3. This characteristic enables the pump to achieve stable oil suction under non-pressurized reservoir conditions, operating reliably without an auxiliary pump, effectively reducing system complexity and installation costs while minimizing cavitation and aeration risk.

3. Constant Power Control with Prime Mover Power Matching
The MKV-23H-RFA-C10-LQ-11 is equipped with the C10 constant power controller, achieving constant power approximation through an external adjustment screw. As system pressure rises, the controller automatically reduces pump displacement to maintain pump input power (P×Q) within the set range, achieving precise matching between hydraulic system power and prime mover output power while effectively preventing prime mover overload. The C10 controller employs a dual-spring measuring mechanism for smooth and stable power control curves, suitable for industrial hydraulic systems such as steel cold rolling mills requiring stable power output under variable load conditions.

4. Constant Pressure Control with System Pressure Stability
The MKV-11H-RFA-P11-Q-11 is equipped with the P11 constant pressure controller, maintaining outlet pressure at a set value through pressure control. When system pressure reaches the setpoint, the pump automatically reduces displacement to maintain only leakage compensation flow, keeping system pressure constant. The P11 controller employs a direct-operated pressure compensator design with rapid response and minimal pressure overshoot, suitable for marine steering gear, deck machinery, and other applications requiring constant pressure output.

5. High-Strength Cast-Iron Housing with Wide Hydraulic Fluid Compatibility
The pump body is precision-cast from high-strength cast iron, with the material’s damping characteristics effectively suppressing structural vibration and fluid-borne noise. The MKV series is compatible with multiple hydraulic fluids: petroleum-based hydraulic oil (standard), phosphate ester (S4), water-glycol (S5), and fatty acid ester (S6). Seal materials are configured according to fluid type, meeting the diverse medium requirements of marine, steel, and other industries. The series is renowned for low noise and low pulsation operation, with industry-leading noise control across the entire pressure range.

6. Modular Controller with Flexible Configuration
The MKV series offers a wide range of controller options: C10 constant power control, P11 constant pressure control, CG constant power + flow control, CP constant power + pressure cut-off, A electric motor control, D hand wheel control, E electric/hydraulic servo control, L lever servo control. Modular controller designs enable field conversion and upgrade, with standardized flange mounting interface and shaft configuration requiring no adaptation for replacement. The series also offers low pulsation type (NE/ME) options for precision hydraulic systems with strict pressure pulsation requirements.

Application Areas

• Marine & Offshore: Steering gear hydraulic systems, windlass hydraulic drives, deck crane hydraulic systems

• Steel & Metallurgy: Mitsubishi Hitachi cold rolling mill main and auxiliary hydraulic systems

• Construction Machinery: Excavator hydraulic systems, crane hydraulic drives

• Industrial Hydraulic Power Units: Large hydraulic power units, central oil supply systems

• Machine Tools: Large machine tool hydraulic systems, test bench hydraulic power sources

• Power Generation: Turbine bypass system hydraulic actuators

• Rubber & Tire Machinery: Hydraulic vulcanizing presses, forming machine hydraulic systems

• Printing Machinery: Large printing equipment hydraulic drive systems

Expert Maintenance Tips

1. Hydraulic Fluid Cleanliness
The MKV series C10/P11 controller spool operates with extremely tight clearances and is highly sensitive to particulate contamination. System fluid cleanliness must meet ISO 4406 18/15/12 or better. Recommended fluids are ISO VG32 or VG46 anti-wear hydraulic oils (petroleum-based). 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. C10 Constant Power Controller Commissioning
The C10 constant power controller achieves constant power control through an external adjustment screw. During commissioning, first confirm the prime mover’s rated power and rated torque, then set the power control curve start point according to actual requirements. The power control setting must ensure that the system does not exceed the prime mover’s available power at maximum working pressure. Adjust only with the system at zero load. Rotate the adjustment screw slowly and verify stable pressure gauge readings before proceeding.

3. P11 Constant Pressure Controller Commissioning
The P11 constant pressure controller maintains outlet pressure at a set value through pressure control. Set the pressure 15–20 bar above the maximum working load pressure, never exceeding the 34.3 MPa rated pressure. Adjust only with the system at zero load. Rotate the adjustment screw slowly. The P11 controller is not a safeguard against pressure overload — a pressure relief valve must be installed in the system.

4. 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.

5. Controller Maintenance and Inspection
MKV series controllers (C10/P11, etc.) should be regularly inspected for adjustment screw seal condition and setting drift. Verify controller settings every 2,000 operating hours. If increased pressure fluctuation or sluggish control response is observed, inspect the controller spool for wear. For models equipped with electrical controllers (Type A/E), regularly inspect electrical connector condition.

6. Hydraulic Fluid Replacement Interval
Replace hydraulic fluid every 1,000–3,000 operating hours or every 6 months, whichever comes first. Recommended fluids are ISO VG32 or VG46 anti-wear hydraulic oils. When using fire-resistant hydraulic fluids (phosphate ester S4, water-glycol S5, etc.), follow the maintenance specifications for the respective fluid. When changing hydraulic fluid, simultaneously replace filter elements and flush the system to ensure no residual contaminants remain.