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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.

Flow control valves

Most flow control valves are adjustable and permit flow control in both directions. The arrow shows that the component is adjustable but does not refer to the direction of flow; it is diagrammatic only.
In the case of the one-way flow control valve, a non-return valve is switched in parallel with the flow control valve. Flow control is effected in one direction only.

Non-return valves & Derivatives

The non-return valve (check valve) is the basis for the development of many combined components. There are two main configurations for nonreturn valves, with and without the spring return. In order to release flow, the pressure force on the spring return design must be greater than the spring force.

Pneumatic, Electrical & Combined

Mechanical

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