Low-temperature pneumatic actuator
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The customer needs low-temperature butterfly valves, but the pneumatic actuators also have to operate in such low temperatures (minus 183 degrees Celsius). Many manufacturers said that it’s too cold for them to manufacture these components, so the customer is considering manufacturing them themselves. Do anyone have any suggestions?
It’s uncertain whether the diaphragm of the pneumatic actuator can withstand it. Could other actuators be considered?
Taking everything into account, pneumatic is still the most suitable option
What about AT double-acting piston type? Can the Saint-Gobain spring-loaded sealing ring on the piston provide a proper seal?
The medium flowing through the pipeline is a cryogenic liquid; does the actuator also need to operate in a low-temperature environment? ? Typical low-temperature pneumatic valves, along with solenoid valves, can operate in normal temperature environments; it’s just that there is a valve stem about 300 millimeters long connecting the actuator to the part of the valve that comes into contact with low-temperature liquids. The diagram below shows a valve integrated into a vacuum-insulated pipeline – the one marked with black lines in the distance is also a pneumatic stop valve. The actuating cylinder is the valve element that does not come into contact with the liquid, and normal temperature is sufficient for its operation
I have solenoid valves for low temperatures – is the entire setup kept in a low-temperature environment? Could you talk about the operating conditions? It seems unnecessary to use a low temperature even without a pneumatic head.
It’s rare to see low-temperature actuators operating at such low temperatures; if it’s confirmed that the temperature is indeed this low, you can consult me regarding low-temperature sealing.
The actuator cannot be exposed; it must be in a low-temperature environment, while things like solenoid valves can be connected outside
The solenoid valve can be disconnected, while the actuator can only operate in low-temperature environments
Regarding sealing, do you have any suggestions?
The valve itself is kept at a low temperature because it handles low-temperature media, and a thermal insulation jacket is usually installed around it. Since the valve features a low-temperature elongable valve stem, the actuator should still operate in a normal temperature environment.