Pressure Relief Valve DBW 20

Huade Hydraulic often provides hydraulic valves with similar quality to first-line brands but at more affordable prices. Pressure relief valve DBW 20 can match Rexroth in terms of performance and parameters. The reason is that Huade Hydraulic has introduced cutting-edge technology from Rexroth due to two long-term cooperation with Rexroth. As a manufacturer with considerable strength in the field of hydraulic transmission and control, Huade Hydraulic pays more attention to the practicality of its pressure valves and is favored by the market. All branches of the enterprise have passed ISO9001, ISO14001 and OH SAS18001. Huade® is a famous national brand China due to reliable quality and stable performance of its products.

Product parameter of Pressure Relief Valve DBW 20

Product Feature And Application of Pressure Relief Valve DBW 20

Features:

▶ Subplate mounting

▶ Porting pattern to DIN 24 340, form E,ISO 6264 and CETOP - RP 121H

▶ Pipe connection

▶ Insert connection

▶ Three adjustment elements:

. Rotary knob

. Hex. head screw with protective cap

. Lockable rotary knob with scale

▶ Solenoid operated unloading via built-in directional spool valve

Application:

The main function of pressure relief valves DBW 20 is to limit and solenoid actuate unloading of the control pressure.

Section And Symbols of Pressure Relief Valve DBW 20

General

Pilot operated pressure relief valves DBW consist mainly of the main valve (1) with main spool assembly (3) and pilot operated valve (2) with pressure adjustment element.

Pressure relief valve type DB

The pressure present in port A acts on the main spool (3). At the same time pressure is applied via the control lines (6) and (7), which are fitted with orifices (4) and (5), on the spring loaded side of the main spool (3) and at the ball (8) in the pilot control valve (2). If the pressure in port A exceeds the valve set at the spring (9), the ball (8) opens against the spring (9).

The signal for this comes internally via the control lines (10) and (6) from port A. The pressure fluid on the spring loaded side of the main spool(3) now flows via the control line (7), orifice bore (11) and ball (8) into the spring chamber(12). Due to the orifices (4) and (5) a pressure drop occurs at the main spool (3), the connection from port A to port B is open. Now the pressure fluid flows from port A to port B whilst maintaining the set operating pressure.

The pressure relief valve may be unloaded or switched over to a different pressure (second pressure stage) via port "X” (15).

Pressure relief valve type DBW

The function of this valve is basically same as the valve type DB

The unloading at the main spool(3),however,is achieved by actuating the built-in directional valve(16).

structure of DBW...50B

Symbol of DBW...50B

Notice

1.The fluid must be filtered. Minimum filter fineness is 20 ㎛.

2.The tank must be sealing up and an air filter must be installed on air entrance.

3.Products without subplate when leaving factory, if need them, please ordering specially.

4.Valve fixing screws must be high intensity level (class 10.9). Please select and use,them according to the parameter listed in the sample book.

5. Roughness of surface linked with the valve is required surface roughness is 0.8.

6. Surface finish of mating piece is required to 0.01/100mm.