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Selection of scotch yoke pneumatic actuator

发布时间:2019-02-11     来源:艾德威尔•瑞拓
Scotch yoke pneumatic actuator, usually refers to the structure of "single cylinder, double piston - variable torque fork type" pneumatic actuator. Mainly used for 90_angle valves. Through compression, air enters the cylinder and drives the fork piston to move, thus realizing the control of the valve. Scotch yoke pneumatic actuatorof fork is generally divided into two types: single-acting and double-acting. Because of the different models, the application of the two types of fork pneumatic actuator will be different. So, do you know how to select the type of fork pneumatic execution?

Introduction to scotch yoke pneumatic actuator

Selection of scotch yoke pneumatic actuator

(1). Dual-acting DA Series
Using double-acting pneumatic actuator, first determine the valve torque, water vapor or non-lubricating medium increased by 30% safety value; non-lubricating dry gas medium increased by 50% safety value; non-lubricating gas transmission of granular powder medium increased by 100% safety value; for clean, non-friction lubricating medium increased by 20% safety value, and then according to the working pressure of the air source, find the dual-acting pneumatic actuator torque. The accurate model of DA series pneumatic actuator can be obtained by table.
(2) Single acting (spring reset) SA series
Using single-acting actuator, first determine the torque of the valve, water vapor or non-lubricating medium increase 25% safety value; non-lubricating dry gas medium increase 60% safety value; non-lubricating gas transmission particle powder medium increase 100% safety value; for clean, non-friction lubricating medium increase 20% safety value, and then look up the single-acting pneumatic actuator torque table, first look up the spring reset end. Point, check the end point of the working pressure of the gas source, the pressure torque of the gas source should be greater than the spring reset torque, and the exact model of SA series pneumatic actuator can be obtained.
In single-acting SA series output torque meter, spring reset "0 degree" torque is the torque of closing valve, spring reset "90 degree" torque is the torque of opening valve. The corresponding torque of "0 degree" of air pressure is the torque of closing the valve, and the torque of "90 degree" of air pressure is the torque of opening the valve.
There are two types of scotch yoke pneumatic actuator, namely double-acting DA series and single-acting (spring reset) SA series. When selecting the type of scotch yoke pneumatic actuator, the best type of fork pneumatic actuator can be selected according to two different series of applicable places.
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