Pressure valves

The function of pressure valves, is to influence the pressure in an overall pneumatic system or in a part of the system. Pressure regulating valves are generally adjustable against spring compression. The symbols are distinguished according to the following types:
- Pressure regulating valve without relief port
- Pressure regulating valve with relief port
- Pressure sequence valves



The symbols represent the pressure valve as a single position valve with a flow path that is either open or closed initially. In the case of the pressure regulator the flow is always open, whereas the pressure sequence valve is closed until the pressure reaches the limit value as set on the adjustable spring.