The plug valve is a quick opening and closing valve. Plug valves are suitable for multi-channel structures, so one valve can obtain two, three or even four different flow channels. This can simplify the design of the pipeline system, reduce the amount of valves and connecting fittings. Plug valves can be divided into soft seal and hard seal structures according to different sealing materials.

1. Lift Soft Seal Plug Valve

(1) Structural features

① The valve adopts soft sealing structure, with reliable sealing performance and zero leakage.

② During the opening and closing operation, there is no wear between the sealing surfaces. It has a long service life.

③ The valve has double blocking, double discharge and fire protection functions.

④ The valve is equipped with a pressure balancing device to prevent abnormal pressure rise of the system and reduce the resistance at the moment of opening and closing of the valve.

⑤ The opening and closing process is completed in two stages, which is convenient for operation. The closing time is long, in order to avoid the occurrence of oil hammer (water hammer) in the pipeline as much as possible.

⑥ The valve can be maintained online. The valve cover at the bottom of the valve body can be disassembled, and the sealing ring seats on both sides can be taken out for maintenance or replacement. The maintenance is simple and convenient.

(2) Application

Soft seal plug valves are widely used in petroleum, petrochemical, natural gas, coal chemical industry, environmental protection sewage treatment, aviation kerosene and pipeline gas industries for regulating, throttling and cutting off media. 

2. Lift Hard Seal Plug Valve

(1) Structural features

① The applicable pressure grade of the valve is PN2.0～42.0MPa, and the temperature range is －101～550℃.

② During the opening and closing operation, there is no wear between the sealing surfaces and it is resistant to erosion. The valve has small operating torque and long service life.

③ The valve has double blocking, double discharge and fire protection functions.

④ Pressure balancing devices or pressure balancing holes are set in the middle chamber and inlet and outlet of the valve to prevent abnormal pressure rise of the system when the valve is closed and reduce the resistance at the moment of opening and closing of the valve.

⑤ The opening and closing process is divided into three actions: lifting, rotating and lowering. The lifting stroke is short and easy to operate.

⑥ It can also reduce the scouring of the medium on the sealing surface of the valve, prevent the accumulation of dirt in the valve cavity, and prolong the service life of the valve.

(2) Application

Hard seal plug valves are suitable for pipes with high temperature resistance, high pressure resistance, wear resistance and erosion resistance, especially for pipes with granular media, such as power, metallurgy, petrochemical and paper industries.

Related products: soft seal butterfly valve,hard seal globe valve