The soft-sealed butterfly valve has an EPDM seal – can it withstand an ambient temperature of -40 degrees?
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I would like to ask everyone: can a soft-sealed butterfly valve with EPDM sealing withstand an ambient temperature of -40 degrees? The medium is air, and the medium temperature is room temperature. But winters in Xinjiang are very cold, with extremely low ambient temperatures.
No, EPDM probably cannot withstand such low temperatures
Can EPDM withstand environmental temperatures? Down to what negative degree?
It has a wide operating temperature range, with the lowest operating temperature ranging from -40 to -60°C... as stated on Baidu
If it is a domestic product, it is recommended not to use it at -40°C.
Thank you all! EPDM seals have some issues in low-temperature environments. :)
At minus 40 degrees, PEEK material seals can be considered; they can withstand temperatures as low as minus 70 degrees without any loss in performance.
The ambient temperature can reach -40 degrees, but the temperature of the air around it should be higher; EPDM can be used at temperatures above -40~~ Of course, it’s better to choose a higher-grade material, such as PTFE soft seals~~
First of all, your valve body should be made of WCB, because cast iron valve bodies become brittle at low temperatures of 0 degrees. That is, when the surface temperature of the valve body approaches 0 degrees, the pressure exerted on the valve body is very low; under normal room temperature conditions, the internal pressure of the valve might be around 6-7 kilograms and the valve functions fine. However, when the surface temperature of the valve body is close to 0 degrees, even a pipeline pressure of 2 kilograms can cause the valve body to crack. Don’t ask me how I know this – I have a client whose facility is in Panjin, Liaoning, where only basic insulation was provided, without any heat tracing. Several butterfly valves through which compressed air passed broke completely.) I had already told them to choose WCB for the valve bodies, but they didn’t listen, deeming the price too high. I said it’s fine for you to choose cast iron for the valve body, but you must provide proper heat tracing – the surface temperature of the valve body must be at least around 20-30 degrees Celsius, the normal room temperature. He didn’t listen to my advice, and that’s what happened as a result. At temperatures of minus 30 to 40 degrees, your pipelines will definitely freeze. If the fluid inside the valves remains in motion, then the valve disc and seat will be fine. However, if the fluid in the pipes stays frozen, the rubber components of the valves may develop leaks as a result of the frequency at which the valves are opened and closed. In low-temperature environments, special attention must be paid to the valve body; otherwise, it will cause a lot of trouble later on. :):):):):):):)