Valve selection in heat transfer oil systems??
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A reaction kettle has its amount of heat transfer oil controlled by temperature. There are two control valves below, one for heat transfer oil at 145 degrees and one for heat transfer oil at -20 degrees. There are two on-off valves above: one for heat transfer oil at 140 degrees, and one for heat transfer oil at -15 degrees. The workshop environment is a Class 100,000 explosion-proof clean area. It needs to undergo FDA certification. Do all valves need to be made of stainless steel? Control valve: The valve body and seat are both made of stainless steel; is the lining material of the valve body PTFE? ? On/off valve: Both the valve body and the valve core are made of stainless steel. The valves are all pneumatic; is it also necessary to distinguish the grade of stainless steel? ? Must the signal line protection tubes for SS304, SS316, 316L valves, as well as the materials used for the air supply pipelines, also be made of stainless steel? ? ?
The valve body made of carbon steel should be sufficient, but low-temperature steel is required at temperatures of minus 15 degrees. Ball valves or butterfly valves can be used for on/off valves; for high-temperature applications, it is necessary to determine whether PTFE can withstand such high temperatures. The solenoid valves on on/off valves should preferably be of the flame-retardant type. In cases where copper is not prohibited for use in the gas supply pipelines, copper pipes can be used, as well as stainless steel pipes. In certain special chemical industries, plastic or nylon pipes are even required for the gas supply pipelines. A galvanized pipe can be used as the protective tube
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If the budget permits, it is recommended to use a bellows-type stop valve to prevent leakage of the medium. Or ball valves and plug valves with dual packing seals can be used. Because if heat transfer oil leaks from the packing, it can easily cause a fire.
Ordinary carbon steel cannot be used; stainless steel of grade 304 or higher must be employed. When there are large temperature differences, factors such as the thermal expansion properties of the steel must be taken into account. Besides, there is low temperature. It is recommended to use imported valves or high-quality domestic valves.
I am also concerned about the selection of valves for heat transfer oils. I just want to know whether butterfly valves are a suitable choice under such operating conditions
Our company uses high-temperature ball valves, but they all have the problem of oil leakage at the handle switch area, and I am also looking for solutions to this issue.
Are bellows typically used in thermal oil valves? The regular one
I recommend using a bellows stop valve, as it offers higher safety and reliability