Page 48 - PNEUMATIC SYSTEM INSTRUMENT

STANDARD SYMBOL FOR DIRECTIONAL CONTROL VALVE

Table 7.3: Valve Description, Symbols, Function and Main applications.

Description Symbol Function Application

2/2-way valve 2/2 ON/OFF Air motor and

without pneumatic tools

exhaust

3/2-way valve- 3/2 (N.C), Single acting

NC Pressurizing or cylinder (push

(Normally exhausting the type),

closed) output pneumatic

signals

3/2-way valve- 3/2 (N.O), Single acting

NO Pressurizing or cylinder (pull

(Normally exhausting the type), inverse

open) output pneumatic

signals

4/2-way valve 4/2 switching Double acting

between cylinders

output A and B,

with common

exhaust.

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