REXROTH overflow valve

REXROTH overflow 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. Specifically, it can be 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.

Overflow valve DBW20B1-5X/100S6EG24N9K4R12 R90118154 Technical parameters:

Product Series DB.10-30

Work pressure, maximum value [bar] 350.0

High flow rate [l/min] 500.0

Spool symbol B

Connection type: Base plate installation

Nominal size 25

Drive type through electromagnetic actuation

Valve ports number 2

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

液压油 HFC (Fuchs: Hydrotherm 46M, Renosafe 500, Petrofer: Ultra Safe 620, Houghton: Safe 620, Union: Carbide HP5046)HLHLPHLPDHVLPHVLPD

Seals NBR

REXROTH overflow valvePartial models:
DBW20A1-5X/200-6EW230N9K4
DBW20A1-5X/200Y-6EW230N9K4
dbw20a 1-5X/200-6eg 24 n9 k 4
dbw20a 1-5X/200y-6eg 24 n9 k4
DBW20A2-5X/200-6EW230N9K4
DBW20A2-5X/200Y-6EW230N9K4
dbw20 a 2-5X/200-6eg 24 n9 k 4
dbw20a 2-5X/200y-6eg 24 n9 k4
DBW20A1-52/200-6EW230N9K4
DBW20A1-52/200Y-6EW230N9K4
DBW20A1-52/200-6EG24N9K4
DBW20A1-52/200Y-6EG24N9K4
DBW20A2-52/200-6EW230N9K4
DBW20A2-52/200Y-6EW230N9K4
DBW20A2-52/200-6EG24N9K4
DBW20A2-52/200Y-6EG24N9K4