Model Definition

DR: Pilot-operated pressure reducing valve product series

30: Nominal size NG32 main valve dimension

5: Internal pilot spring and spool structural code

5X: Pressure grade + design generation code, X represents updated improved internal structure, factory standard modification version

Technical Parameters

Max inlet working pressure: 315 bar

Adjustable secondary outlet pressure range: 6~210 bar (determined by matched built-in pressure spring)

Rated nominal flow rate: up to 300 L/min

Compatible fluid: Mineral-based HLP hydraulic oil, working viscosity 2.8~380 mm²/s, fluid temperature range -20℃~+80℃

Mounting standard: ISO 4401-08-13-07-0 (NG32 CETOP08 sandwich installation dimension)

Drain form: Internal pilot drain as standard configuration, external drain optional upon customization

Standard seal: NBR nitrile rubber, FKM fluoroelastomer optional for high-temperature or non-mineral oil media

Interface & Connection Configuration

Main oil ports: P primary inlet port, A regulated pressure outlet port, internal pilot drain channel built inside valve body

Top regulation assembly: Manual adjustment knob with locking nut and graduated scale for fixed pressure setting

Bottom flat sealing surface: Standard NG32 planar layout for direct stacking onto manifold block and other modular sandwich valves

Internal built-in check valve enabling free reverse flow A→P for rapid actuator retraction

Core Functions

Maintain stable constant pressure on downstream A circuit against primary supply pressure fluctuation and variable load flow changes

Sandwich stacking design realizes compact valve group assembly without extra intermediate mounting plate

Pilot-controlled spool structure ensures high regulation precision and stable dynamic response under large flow variation

Integrated bypass check valve realizes reverse free flow when upstream pressure drops to accelerate cylinder reset action

Inherent pressure limiting characteristic prevents overpressure damage of downstream hydraulic actuators and pipelines

Application Scenarios

Heavy-duty hydraulic press main branch constant-pressure control circuit

Large-tonnage injection molding machine clamping auxiliary pressure regulation loop

Metallurgical heavy equipment multi-loop independent pressure reducing system

Large engineering machinery centralized hydraulic manifold pressure stabilization unit

Heavy-load automated fixture hydraulic clamping control for large-size machining equipment

Usage & Maintenance Instruction

Fully depressurize entire hydraulic system before valve disassembly and overhaul work

Avoid over-tightening adjustment knob to prevent permanent deformation of internal pressure regulating spring

Periodically replace system hydraulic filter every 2000 operating hours to reduce spool jamming risk from oil impurity

Perform internal spool cleaning with filtered clean hydraulic oil if continuous output pressure drifting occurs during operation