Selection principles for diaphragm-type control valves and cylinder-type control valves
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Selection principles for diaphragm-type control valves and cylinder-type control valves
Cylinders should be more durable, but they’re not as lightweight as diaphragms
For gate valves, the linear travel required for opening and closing is sufficient; whereas butterfly valves and ball valves require a larger angular travel to change their valve position, so cylinder-driven valves are more suitable for them. An easy-to-use cylinder valve with double-action control.
Cylinder-driven automatic valves are all on-off valves, not control valves, right?
Many control valves are driven by cylinders.
Cylinders can handle a wide range of pressures, resulting in a relatively high output thrust or torque； Diaphragm types have very low inherent resistance, so they offer relatively good sensitivity; they are a good choice for applications that require high adjustment precision.
It’s easy to make a choice if one considers the film actuator as a cylinder with a short stroke and low required operating pressure.
Work pressure requirements, whether it returns to its original position automatically in case of a failure, etc.
Personally, I think cylinders without diaphragms are more effective; especially since the scouring effect of steam can cause leakage in the cylinder and wear on the cylinder walls due to the impact on the valve stem and piston