Project Description

APT Single Acting Pneumatic Cylinder

1
Catalog

Design of single acting spring return actuator is based on the design structure of double acting actuator. There are 2 different designs : Air Close-Spring Open type and Air Open-Spring Close type. Air Close type is suitable for the services requiring the valve to be opened when air supply is failed or electricity is failed. Air Open type is suitable for the services requiring the valve to be closed when air supply is failed or electricity is failed.

Selection of actuator

This series of actuators are suitable for quarter turn valves with spring return system, follow the below steps to select an actuator:
1. Ensure the valve is subjected to quarter turn type;
2. If valve is required to be closed when air supply is failed, then should select Air Open actuator; if valve is required to be opened when air is failed, then should select Air Close actuator.
3. Confirm operating torque oi the valve;
4. Referring to the table oi rated output torque of springs to select a suitable actuator, generally the rated output torque of selected actuator shall be 1.1 to 1.3 times that of valve’s stem torque, which also depends on the importance oi the valve. 11 it is required with high reliability for the valve operation, then an actuator with more safety factors shall be selected.
5. Pay special attention to the air supply pressure at jobsite when choosing actuators, it is important to select a correct one based on the real air supply pressure.

Contact Now