Hi, I have a simple pneumatic system. A actuator is driven in and out by a 5/2 v

Question

Hi, I have a simple pneumatic system. A actuator is driven in and out by a 5/2 valve. This in turn is controlled by two 3/2 valves with roller stems thus changing direction of 5/2 valve. I need to label up all DCV. My question is, are both the 3/2 valves and the 5/2 valve all considered to be DCV? As they all have an input to the change of direction of the actuator. Or are the two 3/2 the DCV as they determine the position of 5/2? Or the one 5/2 valve as this is the actual valve changing direction of the actuator? I know how to label them up just bit confused as what a DCV is. The actual valve that changes piston direction or the valves that control this final valve

Explanation / Answer

In your case both 3/2 and 5/2 valves are consider as Direction control valve.following information will help you to understand the concept of DCV more clearly.

Directional control valves ensure the flow of air between air ports by opening, closing and switching their internal connections. Their classification is determined by the number of ports, the number of switching positions, the normal position of the valve and its method of operation. Common types of directional control valves include 2/2, 3/2, 5/2, etc. The first number represents the number of ports; the second number represents the number of positions.

3/2 Directional control valve

A 3/2 directional control valve can be used to control a single acting cylinder . The open valves in the middle will close until ‘P’ and ‘A’ are connected together. Then another valve will open the sealed base between ‘A’ and ‘R’ (exhaust). The valves can be driven manually, mechanically, electrically or pneumatically. 3/2 directional control valves can further be divided into two classes: Normally open type (N.O.) and normally closed type (N.C.)

5/2 Directional control valve

When a pressure pulse is input into the pressure control port ‘P’, the spool will move to the left, connecting inlet ‘P’ and work passage ‘B’. Work passage ‘A’ will then make a release of air through ‘R1’ and ‘R2’. The directional valves will remain in this operational position until signals of the contrary are received. Therefore, this type of directional control valves is said to have the function of ‘memory’.

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