Page 92 - Pneumatic ebook (2)_draft 13 sept 2021

Quick Exhaust Valve

1. Quick exhaust valve is used to maximize the speed of piston by exhausting the air rapidly to atmosphere.
2. In many applications especially with single acting cylinders, it is a common practice to increase the piston
speed during retraction of the cylinder to save the cycle time.

3 (exhaust)
❑ When air flows into port 1, port 3 (exhaust) is blocked,
thus air flow to port 2 which is connected to actuator

2 (to cylinder)
Quick exhaust valve
1

3 (exhaust) 2 (to cylinder)
❑ When air flows coming out from port 2, port 1 is
blocked, thus air is rapidly released through port 3
(exhaust). 1
3 (exhaust)

2 (from
cylinder)
1
Symbol of quick exhaust
valve

INTRODUCTION TO PNEUMATIC SYSTEM 41