# Common symbols used for Direction Controlled Valves

**URL:** <https://forumautomation.com/t/common-symbols-used-for-direction-controlled-valves/2654>\
**Category:** Valves\
**Tags:** instrumentation\
**Created:** [November 15, 2017, 8:11pm UTC](https://forumautomation.com/t/common-symbols-used-for-direction-controlled-valves/2654 "2017-11-15T20:11:35Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sivaranjith](https://forumautomation.com/letter_avatar_proxy/v4/letter/s/ba9def/32.png) [@sivaranjith](https://forumautomation.com/u/sivaranjith)\
**Post date:** [November 15, 2017, 8:11pm UTC](https://forumautomation.com/t/common-symbols-used-for-direction-controlled-valves/2654/1 "2017-11-15T20:11:36Z")

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Before going to the symbol of the valves, The switching position, flow direction, and port for different configurations are to be understood.

![](https://cdn.forumautomation.com/original/1X/1fb4840e2d52092c5ec358e402ab1d0fbbccadf0.png) Arrow represents the flow direction

![](https://cdn.forumautomation.com/original/1X/21edd1dd8e0dce943426f5c2101c41ef3cac54cd.png) Closed position

 ![](https://cdn.forumautomation.com/original/1X/5f5904577a7b11b1abac103b15a960ee76ebd625.png) Two position valve

 ![](https://cdn.forumautomation.com/original/1X/dc885a516fb5f40eb61266eb312930851ced9d4f.png) There-position valve

 ![](https://cdn.forumautomation.com/original/1X/cb2faa6069c2c1ecba8a8db4c044bfa6203647ba.png)Ports added to the two-position valve.

 ![](https://cdn.forumautomation.com/original/1X/b7194d069be956079718fc75bfe592458e377ba9.png) Two flow paths

> ## Symbols for Direction Controlled Valves:

**Two-way valves:**

Two way, two position valves

 ![](https://cdn.forumautomation.com/original/1X/473e8a66c6bea278c1f1cc95113f4135e1aadab0.png)

Normally closed valves, P is not connected A normally, connected only when the valve is actuated

 ![](https://cdn.forumautomation.com/original/1X/fb60dbdfa30f8abda0d0426cd2e4d732c7f04726.png)

Normally open opsition, P is connected A. When the valve is not actuated the way is open.

**Three-way valve:**

Three ports, two position valves

![](https://cdn.forumautomation.com/original/1X/d948a7415553c2e3b3bc9b1f86a3bb2906e2d6dd.png)

Normally open position. P is not connected A normally, connected only when the valve is actuated

![](https://cdn.forumautomation.com/original/1X/dc47f80c92bd4b8ade891cf53b3053f544e8728a.png)

Normally open opsition, P is connected A. When the valve is not actuated the way is open.

**Four-way valves:**

_ **Four way, Two position valves:** _

![](https://cdn.forumautomation.com/original/1X/8bc1315384b0bfe4d9cef8ff429b9e2a19b7c5ec.png)

P is connected to A and B is connected to T

![](https://cdn.forumautomation.com/original/1X/a85d9111266db307969a01f9fb775810a050f328.png)

Second position P is connected to B and A is connected T.

_ **Four way, Three position valve:** _

![](https://cdn.forumautomation.com/original/2X/9/9a891d38ade35dc8719446e86f96e6c7e4a6561f.png)

P,T,A,B

![](https://cdn.forumautomation.com/original/2X/9/9807b9a1dc94fa563d9cda8ba9a8895b7b52fbe3.png)

Mid position pump reticulating. P to T, A and B closed

![](https://cdn.forumautomation.com/original/2X/b/bbbab7148e5fda8efb179f33eb340862bbb12b22.png)

H-Mid-position closed; P to A, B to T

![](https://cdn.forumautomation.com/original/2X/e/eba60f4759f80e464df123f2e8cf63293e5aaf08.png)

Mid-position working line depressurized: P,A to B to T

![](https://cdn.forumautomation.com/original/2X/b/bb339efeb36924ce25601197ecaf44ec037c7e48.png)

P to A to B, T