What are the classifications of plug valves? from buzai232's blog

According to the structure, it can be divided into four types: tight-type knife gate valves, self-sealing plug valve, plug valve and oil-filled plug valve. According to the channel form, it can be divided into three types: straight-type plug valve, three-way plug valve and four-way plug valve. There is also a ferrule type plug valve.
Plug valves are classified by purpose including: soft-sealed plug valves, oil-lubricated hard-sealed plug valves, lifted plug valves, three-way and four-way plug valves.
Soft seal plug valve
Soft-sealed plug valves are commonly used in harsh environments such as corrosive, highly toxic and highly hazardous media, where leakage is strictly prohibited, and where valve material does not contaminate the media. The valve body can be made of carbon steel, alloy steel and stainless steel according to the working medium.
Oil-lubricated hard-sealed plug valve
Oil-lubricated hard-sealed plug valves can be classified into conventional oil-lubricated plug valves and pressure-balanced plug valves. Special grease is injected from the top of the plug body between the cone hole of the valve body and the plug body to form an oil film to reduce the valve opening and closing torque and improve the sealing performance and service life. The working pressure can reach 64MPa, the maximum working temperature can reach 325 degrees, and the maximum diameter can reach 600mm.
Lift plug valve
The lift plug valve has a variety of structural forms, and the lift plug valve is classified into a soft seal and a hard seal according to the material of the seal surface. The basic principle is that when the opening is opened, the cock is raised, and the cock is rotated by 90 degrees until the valve is fully opened to reduce the friction with the sealing surface of the valve body; when the valve is closed, the cock is rotated 90 degrees to the closed position and then the valve body is sealed. The surface contact reaches the seal.
Three-way and four-way plug valves
Three-way and four-way plug valves are suitable for use in Shanghai construction equipment to change the direction of media flow or media distribution. Depending on the application, soft seal bushings or soft seals, hard seal lift plug valves are available.
 
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