Regarding where electric valves and pneumatic valves should be used on process pipelines
Thread Content
Dear experts, I would like to ask: where on process pipelines should electric valves be used, and where should pneumatic valves be used?
Poster: It depends on the conditions on site. If there is no air supply but automatic control is desired, then an electric solution can be used; if there is compressed air available, then a pneumatic solution will work
2# alex-xuhua: When making a choice, it is also necessary to consider whether it is flammable and explosive, as well as its memory response speed.
It depends on the application scenario: pneumatic valves are preferable in areas where there is a gas supply. When electric valves are used in explosion-proof environments, explosion-proof electric valves must be chosen, which is rather complicated.
Under normal circumstances, pneumatic valves respond faster than electric valves, and there is no need to consider explosion protection specifically.
This depends on your actual process technology conditions. If you require explosion protection, a low failure rate, fast operation speed, and an available gas supply at the site, then pneumatic valves can be used; if there is no gas supply available, electric valves are the only option! (Electric valves are more expensive for use in explosion-proof environments.) I’m not sure if this answer satisfies the original poster. QQ: 928976489 (Control valve consultant at your disposal)
It shouldn’t be due to the presence or absence of an air supply or explosion protection. Because I’ve seen it before: in the same location, pneumatic valves are used on the flammable pipelines, while solenoid valves are used on the steam pipelines. It seems impossible to explain it according to you.
Electric valves are used when the conditions for using pneumatic valves are not available; generally, pneumatic valves are preferred whenever such conditions do exist. This is because electric valves (especially explosion-proof ones) are costly and do not conform to the principle of cost-effectiveness!
Pneumatic valves respond quickly and are suitable for applications that require fast adjustment, but they have relatively low adjusting force. Electric valves have a slow adjustment speed, but they provide high torque, making them suitable for pipes with large diameters and high flow rates.
It mainly depends on the application requirements. If high sensitivity and fast response time are required, pneumatic valves should be used. Electric valves should be used in places where a large torque is required.
In my opinion, electric valves respond quickly and have a short operation time for opening and closing, while pneumatic valves are suitable for areas with high explosion protection requirements; generally, pneumatic valves are used as shut-off valves for entering tanks in oil storage areas.