Hydraulic gear pumps and valves GRH

Hydraulic machinery manufacturer GRH: high pressure external gear pumps, rotary gear motors, low speed orbit motors, and directional control spool valves.

External hydraulic gear pumps GRH series 0PF, 1PF, 2PF, 3PF

External gear pumps GRH series 0PF, 1PF, 2PF, and 3PF are developed for mobile machinery, harvesters, and material handling systems. Rigid aluminum and ductile iron housings maintain continuous operating pressure up to 28 MPa within severe mobile actuation circuits.

Displacement range from 0.16 to 199 cm³/rev covering diverse fluid power actuation units
Continuous working pressure rating of 25 MPa with peak pressure endurance up to 28 MPa
Mounting flange arrangements conforming to SAE and standard European industrial designs
Precision gear tooth geometry minimizes fluid pulsation and lowers operating noise level

Hydraulic external gear motors GRH series 1MF, 2MF, 3MF

External gear motors GRH series 1MF, 2MF, 2.5MF, and 3MF convert hydraulic flow into rotary mechanical power. These units support bi-directional operation and feature integrated drain passages engineered for heavy utility loaders, cooling fans, and agricultural sweepers.

Displacement ratings from 1.1 to 115 cm³/rev for fan drives and mechanical rotation drives
Maximum output shaft rotation speeds reaching up to four thousand revolutions per minute
Integrated anti-cavitation check valves prevent fluid starvation during sudden shutdown
Reinforced heavy-duty journal bearings absorb substantial radial and axial shaft loads

Low speed orbit gerotor motors GRH series GWD, GKC, GKB, GP

Low speed high torque orbit motors GRH series GWD, GKC, GKB, GKA, and GP produce substantial rotational torque within compact dimensions. The planetary gerotor gear set guarantees smooth rotation at low speeds across winches, grain augers, and crawler propulsion drives.

Swept displacement volume from 25 to 985 cm³/rev for demanding machinery rotation drives
Output rotational torque delivers up to fifteen hundred Newton meters at low spindle speeds
Spool valve and disc valve fluid distribution for elevated mechanical and volumetric efficiency
High pressure shaft seals withstand backpressure surges within return hydraulic manifolds

Sectional directional control valves GRH series GKV35, GKV50, GKV80

Modular sectional directional valves GRH series GKV35, GKV50, and GKV80 deliver customizable spool control for mobile hydraulic machinery. The stackable layout allows assembling up to twelve directional spools into one manifold block equipped with unified supply lines.

Rated flow capacity ranges from 10 to 100 liters per minute across individual spools
Assembly configurations up to 12 spools with manual, cable, pneumatic, or solenoid control
Individual load check valves and secondary port relief valves integrated into each section
Micro-finished spool surfaces and precision bore machining prevent internal fluid leakage

Monoblock directional valves GRH series GDV25, GDV70, GDV120

Monoblock directional control valves GRH series GDV25, GDV45, GDV70, GDV80, GDV120, and GDV160 feature rigid one-piece iron housings. This monoblock architecture eliminates external seal joints, preventing external oil leakage under severe cyclic pressure pulses.

Rated continuous flow capacity extends from 15 to 170 liters per minute in mobile lines
Maximum working pressure capacity engineered up to 31.5 MPa in heavy iron body blocks
Spool configurations range from 1 to 6 internal fluid circuits inside one solid housing
Integrated primary pilot relief valve and built-in load check valve prevent load dropping

Proportional load-sensing valves GBV100 and gear flow dividers FDF

Proportional electro-hydraulic valves GRH series GBV100 alongside synchronous gear flow dividers FDF enable precise regulation of hydraulic fluid power. Post-spool pressure compensation technology ensures consistent actuator speeds irrespective of external working loads.

Load-sensing electro-hydraulic architecture with individual post-spool compensators
Synchronous gear flow dividers series FDF synchronize movement of paired hydraulic cylinders
Proportional control actuated by 12V or 24V DC solenoid modules with analog feedback
Integration options into compact hydraulic power units HPU tailored to user blueprints

Industrial manufacturing background and fluid power evolution of GRH

The engineering heritage of Chinese fluid power manufacturer GRH began in 1986 when a dedicated hydraulic gear pump facility was established in Jianhu County, Jiangsu Province.

Through over three decades of systematic technical evolution, the enterprise expanded from a specialized machining plant into a prominent global fluid power manufacturing corporation.

Modern production facilities of GRH are located within the Jianhu High-Tech Industrial Zone, operating five specialized product divisions.

The manufacturing plants feature automated multi-axis numeric control turning centers, precision cylindrical grinding machinery, and computerized test rigs monitoring hydraulic displacement metrics.

External gear pumps series 0PF, 1PF, 2PF, and 3PF for mobile machinery

External gear pumps GRH series 0PF, 1PF, 1.5PF, 2PF, 2.5PF, 3PF, and 4PF represent positive displacement fluid power units offering swept volumes from 0.16 to 199 cm³/rev.

These pumps sustain continuous working pressures up to 25 MPa with peak pressure surges reaching 28 MPa throughout demanding outdoor operating environments.

Pump bodies are produced from high-strength extruded aluminum alloy and ductile iron materials that maintain dimensional rigidity under continuous pressure impulses.

Precision ground gear tooth profiles and floating side wear plates minimize internal volumetric bypass, ensuring overall operating efficiency exceeding ninety percent.

External gear motors and low speed orbit motors series 1MF and GWD

The fluid power motor portfolio of GRH encompasses high speed gear motors series 1MF, 2MF, 3MF and low speed high torque orbit motors series GWD, GKC, GKB, and GP.

External gear motors operate at speeds up to four thousand revolutions per minute, widely driving radiator cooling blowers, booster pumps, and street sweeper brooms.

Planetary gerotor orbit motors deliver substantial start-up torque up to fifteen hundred Newton meters at steady low rotation velocities.

Bi-directional rotation capability, built-in anti-cavitation check valves, and rigid hydrodynamic shaft bearings extend service life within mechanical winches, agricultural augers, and belt conveyors.

Sectional directional control spool valves series GKV35, GKV50, and GKV80

Modular sectional directional valves GRH series GKV35, GKV50, and GKV80 provide directional regulation of hydraulic oil flow to cylinders and motors on mobile machinery.

The sectional architecture allows integrating from one to twelve directional spools into a rigid manifold assembly sharing common inlet and return galleries.

Every work section incorporates an individual load check valve to prevent unwanted actuator drop under external load forces.

The valve family supports manual hand levers, flexible remote push-pull cables, pneumatic actuation, as well as discrete and proportional 12V and 24V direct current electromagnetic pilot solenoids.

Monoblock directional control valves series GDV25, GDV70, and GDV120

Monoblock directional control valves GRH series GDV25, GDV45, GDV70, GDV80, GDV120, and GDV160 are engineered within high-strength one-piece ductile iron body structures.

The absence of external tie-bolts and inter-section interface seals prevents external leakage risks under vibration and cyclic working pressures up to 31.5 MPa.

The valve blocks feature an integrated direct-acting relief valve adjustable to required hydraulic limits alongside secondary anti-cavitation check valves on actuator work ports.

The rigid monoblock construction delivers dependable resistance against fluid contamination in road construction and agricultural environments.

Electro-hydraulic proportional load-sensing valves series GBV100

Proportional directional valves GRH series GBV100 featuring load-sensing technology incorporate post-spool pressure compensation architecture.

This hydraulic circuit topology ensures that actuator speeds remain strictly independent of fluctuating working loads during simultaneous operation of multiple tooling mechanisms.

Combining proportional valves GBV100 with synchronous gear flow dividers FDF allows smooth automation of articulated cranes, utility aerial work platforms, and agricultural headers.

High resolution proportional electromagnetic coils provide smooth velocity modulation and repeatable boom positioning control.

GRH and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of GRH and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.