Page 86 - Pneumatic ebook (2)_draft 13 sept 2021

Non Return Valve (Check Valve)

1. A non-return valve allows air flow freely only in one direction and do not let the air to flow in opposite direction.
This type of valve also known as poppet type valve and is basis for the development of many combined
components such as shuttle valve, quick exhaust valve and one way flow control valve.
2. This is a unidirectional valve where it has two ports: one for the entry of fluid and the other for the discharge.

Check valve ❑ When air flows from port 1, the check valve allows the air flow by lifting the ball against
and come out through port 2.

1 2 ❑ When air flows from port 2, the ball is blocked, thus no air flow is allowed to port 1.

2

Spring loaded
check valve

Click here to watch working
principle of check valve
1

Cross sectional view of check valve

INTRODUCTION TO PNEUMATIC SYSTEM 38