NP-72MV

NP-72MV hydraulic pump in aircraft pressure systems

The NP-72MV is an aircraft axial-piston hydraulic pump used as a pressure source in main hydraulic systems of Soviet and Russian aircraft. It is installed on the aircraft engine accessory gearbox and receives mechanical drive from the engine. The pump supplies AMG-10 hydraulic fluid to the pressure line and maintains the operating pressure required for hydraulic consumers. Unlike electric emergency pumps, the NP-72MV is a mechanically driven unit. Its output depends on engine operation, pump condition, regulator function, and the hydraulic demand of the connected aircraft system.

Pressure generation by the NP-72MV pump

The main function of the NP-72MV is to create hydraulic pressure for flight-control, landing-gear, braking and wing-mechanization systems, depending on the aircraft type. The pump is not just a transfer unit for fluid circulation. It is a high-pressure hydraulic power source that feeds the system with variable delivery. When hydraulic demand is present, the pump increases delivery. When system pressure reaches the upper working range, its internal regulator reduces output and protects the system from unnecessary loading. This makes the pump suitable for continuous work in the main hydraulic network.

Variable-displacement design of NP-72MV

The NP-72MV is built as an axial-piston pump with a variable delivery mechanism. The pump’s internal piston group and regulator assembly adjust the amount of hydraulic fluid supplied to the system. This allows the unit to respond to pressure changes instead of constantly delivering maximum flow. In normal operation, the pump charges the hydraulic system and then reduces delivery when the pressure reaches the required level. This design lowers heating, reduces load on the drive, and keeps the hydraulic system within its intended pressure range.

NP-72MV installation on aircraft engines

The NP-72MV is mounted on the engine accessory gearbox, for example on aircraft using D-36-type engine installations, depending on aircraft configuration. The pump drive shaft is connected to the gearbox spline shaft, which transfers rotation from the engine to the pump rotating group. Because of this installation method, correct spline condition, flange fit, sealing, alignment and rotation are important during maintenance. If the pump is installed incorrectly or the drive interface is damaged, the aircraft hydraulic system may lose pressure or the pump may suffer mechanical wear.

NP-72MV in An-72, An-74 and Yak-42 systems

The NP-72MV is associated with aircraft such as An-72, An-74 and Yak-42, where it works in the main hydraulic power system. On these aircraft, hydraulic pressure is used by landing gear, wing mechanization, brake circuits, steering or flight-control actuators depending on the system layout. The pump works with hydraulic reservoirs, shut-off valves, check valves, pressure regulators, relief valves and accumulators. For troubleshooting, it is important to look at the whole pressure-source circuit, not only the pump. A pressure issue may come from the pump, suction line, regulator, relief valve, reservoir pressure, or downstream leakage.

Hydraulic equipment working with NP-72MV

In the aircraft hydraulic system, the NP-72MV may work together with engine fire shut-off valves on the suction line, hydraulic reservoirs, check valve blocks, safety valves and hydraulic accumulators. A shut-off valve can stop fluid supply to the pump in an engine fire condition. Check valves prevent reverse flow when the engine is stopped or when another pressure source is operating. Relief valves protect the system if pressure rises beyond the permitted limit. Hydraulic accumulators reduce pulsations and store pressure for short-term demand. These units form the working environment around the pump.

Service inspection and supply of NP-72MV

The NP-72MV is an aircraft component subject to strict technical control. When ordering or replacing the pump, the full designation, aircraft type, engine installation, documentation status and remaining life must be checked. A unit may be supplied as new, first-category storage stock, repaired, overhauled or serviceable with documents. Before installation, maintenance personnel normally inspect the body, drive shaft, flange, ports, regulator area, sealing surfaces, storage condition and passport records. Bench testing should confirm pressure, delivery, regulator response, leakage and operation under specified conditions.

Product Type: Aircraft axial-piston hydraulic pump
Designation: NP-72MV
Pump Type: Axial-piston / plunger-type high-pressure pump
Delivery Type: Variable displacement / variable delivery
Function: Creation and maintenance of hydraulic pressure in aircraft hydraulic systems
Application / Where Used: Main hydraulic systems of civil and transport aircraft
System / Installation Area: Engine-driven hydraulic pressure source; aircraft engine accessory gearbox installation
Typical Powered Systems: Flight-control actuators, landing gear extension / retraction, wheel brakes, wing mechanization and hydraulic control units depending on aircraft type
Compatible Aircraft / Equipment: An-72, An-74, Yak-42 and related aircraft configurations
Typical Engine / Drive Installation: Accessory gearbox of main aircraft engines, including D-36-type installations depending on aircraft configuration
Working Fluid: AMG-10 aviation hydraulic oil
Normal Working Pressure: 140–170 kgf/cm² / 14–17 MPa
Maximum Pressure / Valve Setting: Up to 210 kgf/cm² / 21 MPa
Flow Rate: Variable; maximum delivery approximately 35–70 L/min depending on engine speed and operating mode
Design Type: Axial-piston pump with inclined cylinder block
Working Fluid Temperature Range: −60 to +120 °C; short-time up to +150 °C
Approximate Weight: 6.2–6.8 kg depending on version and installation flange
Approximate Dimensions: 265 × 160 × 155 mm
Mounting: Engine accessory gearbox flange installation
Built-In Regulation: Internal delivery regulator / unloading mechanism
Associated Suction Line Component: Fire shut-off valve, such as MKT-162 depending on system configuration
Associated Hydraulic Components: Hydraulic reservoir, check valve block, relief valve, hydraulic accumulators and distribution units depending on aircraft system
Typical Relief Valve: RD-22 or equivalent depending on aircraft hydraulic layout
Typical Consumers: Landing gear, brakes, wing mechanization, flight-control hydraulic boosters and automatic control system actuators depending on aircraft type
Technical Documentation: Product passport, acceptance documents, overhaul documents, bench-test data and aircraft hydraulic system documentation as applicable

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Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.