Bosch Rexroth R901077304 Directional Seat Valve Unit

Module Feature

R901077304 corresponds to Rexroth model M-4SEW6D3X/420MG125N9K4/B18V. It is a solenoid actuated directional seat valve with ball poppet closing element. The ball-seat structure achieves extremely low leakage when closed. Pressure compensation design balances the force of solenoid and return spring, stable operation up to 315 bar working pressure. Compact valve body, integrated solenoid coil. Widely used for hydraulic cylinder locking, safety cut-off and on-off control on machine tools, test benches and hydraulic presses.

Working principle

Spring force presses the ball poppet onto the valve seat to block oil flow in de-energized state. When solenoid coil energizes, electromagnetic force pushes the ball away from seat to open oil passage and switch fluid path. Ball seat provides tight shut-off for load holding application.

Onboard components

Cast valve housing, hardened ball poppet, valve seat, return spring, electromagnetic solenoid coil, sealing gaskets, threaded hydraulic ports.

LED indicators

No built-in LED indicators.

Hardware self-diagnosis

Check coil continuity, inspect external oil leakage, test valve switching action, measure leakage at seat, check contamination level of hydraulic oil.

Programming software

No dedicated programming software.

Electrical & Process Parameters

Model:R901077304 Brand:Bosch Rexroth Device type:Solenoid Directional Seat Valve Full type:M-4SEW6D3X/420MG125N9K4/B18V Max working pressure:315 bar Sealing principle:Ball poppet seat seal Compatible fluid:Mineral hydraulic oil Cooling:Natural convection cooling Protection:Solenoid IP65 protection

Mechanical & Structure

Mounting:Subplate mounting Protection class:IP65 for solenoid assembly Housing:Cast alloy valve body

Environmental

Operating temperature:-20℃ ~ +60℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non-condensing Certification:CE compliant Status: Bosch Rexroth original ball seat directional valve for low-leakage hydraulic locking and on-off control

Installation

Follow strict safety procedure before handling.Mount valve on standard subplate and tighten hydraulic fittings.Connect solenoid power wiring, test valve open/close action, check seat leakage before full pressure commissioning.

Interface

Subplate mounting interface, hydraulic threaded ports, solenoid electrical terminal block.

Diagnostic

Valve fails to open:coil burnout, no supply voltage or mechanical jam. High leakage in closed state:ball/seat wear or dirt trapped on sealing surface. External oil leak:damaged gasket or loose port connection.

Product Brief

Bosch Rexroth R901077304 M-4SEW6D3X ball poppet directional seat valve,315 bar rated pressure,subplate mount,used for low-leakage hydraulic locking and on-off control.