Can hot water pipes be fitted with butterfly valves?

If it is used to cut off the flow of media, you can use butterfly valves, gate valves, globe valves, etc.; if it is used to check, you can use butterfly check valves, if it is used to regulate the flow, you can use globe valves, ball valves.

Butterfly valves are suitable for fresh water, sewage, sea water, salt water, steam, natural gas, food, pharmaceuticals, oil and various acids and alkalis and other pipelines that require complete sealing, zero leakage in the gas test, high life expectancy and working temperatures from -10 degrees to 150 degrees.

Butterfly valve can be used in hot water pipeline, in fact, the key lies in the butterfly valve valve body and hot water direct contact with the valve seat sealing surface material. The hot water we usually talk about is generally water above 70°C. In this temperature case, it is recommended to use a hard-sealed butterfly valve.

If you search for the answer online, you should see that many people do not recommend using soft seal butterfly valves for hot water, because the seat material of soft seal butterfly valves is mostly rubber, PTFE, etc. Long-term contact with high temperature (hot water) will accelerate aging, shorten the service life of the valve, affect the sealing performance of the valve and cause internal leakage.
This statement is not a problem, the theoretical temperature range of rubber material in -20 ~ 150 ℃, but because of the various manufacturers to produce rubber quality levels, so in actual use, this temperature range will be significantly shrunk, in the hot water environment, of course, will accelerate the aging.
But soft seal butterfly valve is not completely can not be used for hot water pipeline, can use high temperature resistant rubber material, the effect will be much better, service life is also longer, but the cost is also higher.