Pressure Relief Valve DB 20

Compared with other similar products, Huade® pressure relief valves are more advanced in technology and more durable in this field. Type DB 20 valves can replace DB 20 offered by Rexroth. The factory is committed to providing customers with high-quality and stable hydraulic pressure valves. It has introduced more than 750 advanced production equipment from all over the world. The factory has passed ISO9001, ISO14001 and OH SAS18001. Huade® hydraulic valves are relatively cheap compared to world-renowned brands. Because of its high quality and low price, Huade Hydraulic has attracted many customers at home and abroad and has won the wide recognition of consumers.

Product parameter of Pressure Relief Valve DB 20

Product Feature And Application of Pressure Relief Valve DB 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

Function, Section And Symbols of Pressure Relief Valve DB 20

General

Types DB pressure valves are pilot operated pressure relief valves.

They are used for the limitation of the control pressure.

The pressure relief valves (DB) 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). In type DB...50B/...it flows internally via the control line(13) to tank,or in type DB..50/..Y..externally via the control line (14). 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).

structure of DB...50B

Symbol of DB...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.