Control valve
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Is it correct to say that pneumatic diaphragm control valves are divided into straight-through single-seat control valves and straight-through double-seat control valves?
Pneumatic diaphragm control valves cover not only straight-through single-seat valves and straight-through double-seat valves.
It’s not quite accurate; the diaphragm in a pneumatic diaphragm control valve is part of the classification of actuators. The main types of actuators are pneumatic, electric, and hydraulic. Regulating valves can be classified into various types based on the structure of their valve bodies, such as single-seat, double-seat, angle valves, labyrinth-type valves, and multi-stage pressure-reducing valves
The diaphragm of a pneumatic diaphragm control valve is a classification of actuators. Actuators are classified into pneumatic, electric, and hydraulic types based on the power source used, with pneumatic actuators further divided into diaphragm actuators and cylinder actuators. Single-seat valves and double-seat valves are types of valve body structures, and valve body structures are classified into two main categories based on the mode of actuation: linear stroke and rotary stroke.