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Inst Tools > Blog > Animation > Spring and Diaphragm Pneumatic Actuators

Spring and Diaphragm Pneumatic Actuators

Last updated: March 21, 2019 11:14 pm
Editorial Staff
Animation Control Valves
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Spring and diaphragm pneumatic actuators can be “direct-acting”, meaning that air to the diaphragm casing pushes the actuator stem downward.

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Spring and Diaphragm Pneumatic ActuatorsArticles You May Like :What is a Pneumatic Actuator ?Types of Control ValvesWhat is a Hydraulic Actuator ?Basics of Actuators4-way Solenoid Valve ?

This “air-to-close” action compresses the spring, which in turn pushes the actuator stem back up when the supply pressure is decreased or lost.

Spring and Diaphragm Pneumatic Actuators

Spring and Diaphragm Pneumatic Actuators

Additionally, spring and diaphragm pneumatic actuators can be “reverse-acting”, meaning that air to the diaphragm casing causes the actuator stem to move upward.

This “air-to-open” action compresses the spring, which in turn causes the actuator stem to move downward when supply pressure is decreased. This is the most common type of diaphragm actuator used, as the spring action results in a valve “fail-closed” position upon loss of supply air.

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