|
When the pressure inside a hydraulic circuit reaches a predetermined value, the valve opens to bypass part of the flowing oil to the return side, thereby maintaining the circuit pressure constant. It is also used as a pressure relief valve to protect the pump and equipment.
According to the capacity and set pressure, relief valves are available in many different models as shown in the table below.
Models of relief valves
| Applications / Series |
1 |
2 |
3 |
4 |
| 1. Safety valve for instant pressure release, such as in oil transport |
1VB |
2VB |
3VB |
4VBP |
| 2. Pressure regulator for a hydraulic device or forced oil circulation pump (with a subplate) |
1VBD |
2VBD |
3VBD |
4VBPD |
| 3. Pressure regulator for a forced oil circulation pump or hydraulic device (without a subplate) |
- |
2VD |
- |
- |
| Pressure range MPa |
0.2～0.4 |
0.08～2.5 |
0.08～3.0 |
0.15～2.0 |
| Maximum flow rate L/min |
8 |
36 |
100 |
200 |
Relief valve circuit diagrams and installation methods
 |
