The butterfly valve is simple in structure, small in size and light in weight, and only consists of a few parts. Moreover, it can be opened and closed quickly only by rotating 90 °, which is simple to operate. At the same time, the electric valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has good flow control characteristics. Butterfly valve has two sealing types: elastic seal and metal seal. For elastic sealing valve, the sealing ring can be embedded on the valve body or attached to the periphery of the butterfly plate???

Application of Compensator in Gas Cause of Breakage of Nonmetallic Fabric Compensator
The laying position of gas inlet pipe shall conform to the following rules:
The gas inlet pipe shall not be laid in the center of the bedroom, toilet, flammable or explosive warehouse, room with corrosive medium, power generation room, power distribution room, transformer room, air conditioning room not using gas, ventilation room, computer room, cable trench, heating trench, flue, air inlet duct, garbage duct, etc.
The residential gas inlet pipe should be located in the kitchen, corridor, closed balcony connected to the kitchen (the balcony should be closed when wet gas is recommended in cold areas) and other non residential rooms that are convenient for maintenance. When it is really difficult, it can be introduced from the stairwell, but metal pipes and inlet pipe valves should be set outdoors.
The gas inlet pipe of commercial and industrial enterprises should be located in the room where gas is used or in the gas meter room.
The gas inlet pipe should be led through the wall along the outer wall. The upper bend of outdoor exposed pipe section shall be provided with a cleaning tee and a plug no less than DN15, and shall be subject to anti-corrosion treatment. The wet gas shall be insulated in cold areas.
The lead-in pipe can be buried through the external wall or the foundation of the building and led into the room. When the lead-in pipe passes through the wall or enters the building, it shall be laid out of the indoor air in a short interval and shall not be laid in the indoor air.