DB30 Pilot Operated Pressure Relief Valves

DB/DBW type 5X series Pilot Relief Valve

Orifice (NG) 10-32 pressure to 35MPa flow to 650L/min
for chassis mounting
Mounting surface according to DIN24340 E type,
ISO 6264 and CETOP-RP 121 H,
for threaded connections,
For oil block installation
4 adjustment elements
knob
Adjusting screw with guard
Graduated Locking Knob
with scale knob
5 kinds of setting pressure
By means of a Solenoid Directional Valve mounted on it
Operation unloading
Selectable switching time delay (DBW type only)

Jinhai is professional manufacturer of Various types of Directional Control Valves, Flow Control Valves, Pressure Control Valves and Accessories, Should you have any questions please feel free to come back to us.

DB/DBW Pressure Control Valve is a pilot Relief Valve.
They are used to limit (DB) or limit and system pressure with solenoid (DBW). The relief valve (DB) mainly consists of main valve (1) with main spool insert (3) and pilot with pressure regulating element valve (2).


DB type relief valve
The pressure in circuit A acts on the main spool (3). At the same time, the pressure acts on the ball (8) of the main (3) and the first (2) through the belt joint (4) (5 system passage (6) (7). If the pressure in the passage A exceeds the spring (9) The setting value, ball (8) overcomes bullet (9) and opens.

The signal for this is supplied internally from the A channel by the control oil (10) and (6). The oil on the loading side of the main spool (3) passes through the control port (7), throttling (11) and ball (8) into (12). From here internal supply - DB-5X-type via control channel (13), or external supply - DB..-5X..Y-type, via control channel (14) into tank. Orifices (4) and (5) create a pressure drop across the spool (3), opening from the A-pipe to B-pipe connection. Oil flows from pipe A to pipe B, while the set working pressure remains unchanged. The relief valve can be unloaded or switched over to a different pressure (second pressure rating) via port X (15).

Pressure relief valve (superimposed) with switching time delay type DBW../.S..R12