DRS 6 -1X/100AMG24K32MG R901055990 Bosch Rexroth Proportional pressure reducing valve

Valves of type DRS are pilot-operated 3-way pressure reducing valves with pressure limitation of the actuator. They are used for reducing a system pressure. Set-up The valves consist of three main assemblies:

• Pilot control valve (1)

• DC motor (2) with position feedback

• Main valve (3) with main spool (4)

• Optionally with or without pressure transducer (18)

Function

• Command value-dependent setting of the pressure to be reduced in channel A via the DC motor (2).

• In the depressurized port P, the spring (17) holds the main spool (4) in the initial position → Connection from port A to T open, port P to A blocked

• Pressure connection from port P to the ring channel (5). Pilot oil flows through the bore (6) via the flow controller (7) into the pilot control chamber (16), via the nozzle (8), the throttle gap (9) into chamber (10) and via bores (11; 12) to port T.

Pressure reduction

• Build-up of the pilot pressure in the pilot control chamber (16) as a function of the command value.

• Movement of the main spool (4) to the right → hydraulic fluid flows from P to A.

• Actuator pressure present in port A to the spring chamber (15) via channel (13) and nozzle (14).

• Increase in the pressure in port A to the set command pressure leads to the movement of the main spool (4) to the left in its control position. Pressure in port A is almost identical to the set pressure at the pilot control valve (1).

Pressure limitation not possible if there is dirt.

• If the pressure in port A exceeds the set command pressure, the main spool (4) is moved further to the left.

• This closes the connection from P to A, opens the connection from P to T and limits the pressure present in port A according to the set command value.

Pressure monitoring With valves with integrated pressure transducers, the transducer is connected to the electronics and is intended for the recording and monitoring of the pressure set in channel A. Another alternative is a valve without integrated pressure transducer but with a sandwich plate for pressure measurement. (For example applications, see data sheet 62003) Notice: If the voltage supply of the control electronics is switched off or fails, the DC motor stops at its current position which means that, if the hydraulic supply is available, the most recently set pressure is maintained. Type DRS 6 -1X/...