REXROTH proportional relief valve

REXROTH proportional relief valveThe working principle of the system is mainly based on pressure balance and flow control, which achieves system stabilization, unloading, and safety protection through the opening and closing action of the valve core. It can effectively protect the hydraulic system from excessive pressure threats while ensuring stable operation of the equipment. DBEM20-7X/200YG24K4M R901353036 nominal size 20, P → T, P → Y, electrically controlled through external electronic components.

The working principle of Rexroth proportional relief valve can be specifically divided into the following four points:

Pressure balance control

When the system pressure is lower than the set value, the spring force keeps the valve core closed, and the system pressure is determined by the load.

If the system pressure exceeds the set value, the hydraulic pressure will push the valve core to open, and the excess oil will flow back to the oil tank through the overflow port, thereby stabilizing the inlet pressure.

Structure composition and type

Direct acting: composed of a valve body, a valve core, a pressure regulating spring, and a pressure regulating screw, the valve core is controlled to open and close by balancing hydraulic pressure and spring force.

Pilot type: It includes a pilot valve and a main valve. Hydraulic pressure acts on the pilot valve core through a damping hole, and the main valve opens when the pressure exceeds the spring force.

Proportional: The electromagnet controls the spring force to achieve pressure proportional adjustment.

core functionality

Voltage stabilization: Connected in series on the return oil line, the inlet pressure is kept constant through overflow to ensure stable operation of the system.

Unloading: When the remote control port is connected to the solenoid valve, the valve quickly opens the unloading pump to protect the hydraulic components.

Safety protection: Set the pressure higher than the system working pressure (usually 10% -20% higher) to prevent overload damage to the equipment.

Technical Features

High precision manufacturing, small acting area of cone valve, moderate spring stiffness, light pressure regulation and fast dynamic response.

Support wet electromagnetic design to reduce wear and improve heat dissipation performance.

REXROTH proportional relief valveDBEM20-7X/200YG24K4M R901353036 Technical parameters:

Product Series DBEM (E)

Work pressure, maximum value [bar] 350.0

High flow rate [l/min] 550.0

Spool symbol P → T, P → Y

Connection type: Base plate installation

Nominal size 20

Drive type achieves electrical control through external electronic components

Valve ports number 4

Switch position quantity 2

Power supply voltage 24 VDC

Electrical connector 3-pin equipment connector (2+PE)

Electric connection description 3-pin device connector (2+PE), compliant with EN 175301-803 standard

Hydraulic oil HETGHFCHLHLP

Seals NBR

Weight [kg] 5.2

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