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Pressure Relief Valves Type DB3U
MOQ: 100 PCS
Note: If you have any questions,please contact us
- 1.Subplale mounting; Threaded connection
- 2. Installation in manifolds; 3 adjustment elements:
- 3. Rotary knob; Screw with internal hexagon and protective cap
- 4. Rotary knob with scale
- 5. Solenoid operated control via mounted directional valve
- DB3U
BEIJING HUADE HYDRAULIC INDUSTRIAL GROUP CO.,LTD
Since:
1979
Product Description
| BEIJING HUADE HYDRAULIC INDUSTRIAL GROUP CO.,LTD. | Pressure relief valves,type DB3U | RE 25825/122004 | ||
| Size 10 to 30 | up to 31.5 MPa | up to 600 L/min | Replaces： RE25825/05.2001 | |
Functional description, section
Types DB3U pressure valves are pilot operated pressure relief valves.
They are used far the limitation of the operating pressure, and they may be switched over to different(2 or 3 pressure stage)by solenoids actuated.
The pressure relief valves consist mainly of the main valve.4/3,4/1-Directional control valve(Type WE5...)and three pilot valves.
In the DE-energised condition the pressure in port A is set by pilot valve(7).
The pressure present in port A acts on the main spool(1). At the same time pressure is applied via the control lines (12) and (4),which are fitted with orifices (2) and ⑶,on the spring loaded side of the main spool(1) and at the poppet(6) in the pilot control valve (7).
If the pressure in port A exceeds the value set at the spring (8),the poppet (6) opens against the spring (8).
The signal for this comes internally via the control lines (12) and (4) from port A.The pressure fluid on the spring loaded side of the main spool(1) now flows via the control line (3),poppet (6) into the spring chamber(9).in type DB3U...30/.
it flows internally via the control line (10) to tank,or in type DB3U..30/..Y..externally via the port Y. Due to the orifices (2) and (3) a pressure drop occurs the main spool(1),the connection from port A to port B is open.
Now the pressure fluid flows from port A to port B while maintaining the valve set operating pressure.
When solenoid a” is energized:
The pressure in port A is set by pilot valve n.
When solenoid “ b“ is energized:
The pressure in port A is set by pilot valve I.
The setting pressure of pilot valve(7) should be higher than the setting pressure of the pilot I and D. Type DB2U:
Type DB2U pressure valves consist mainly of a directional control valve (Type WE5...)and three pilot valves the function of this valve is basically the same as the valve type DB3U.
Ordering code
Symbols
Operating curves(measured at V=41mm2/s and t=50℃)
Unit dimensions: For subplate mounting (Dimensions in mm)
Unit dimensions: threaded connection (Dimensions in mm)
Unit dimensions: for cartridge connection (Dimensions in mm)
