A plug valve is a type of quick-opening, straight-through valve. Because the movement between the sealing surfaces creates a wiping effect, and it completely prevents contact with the flowing medium when fully open, it can also be used for media containing suspended particles. Another important characteristic is its ease of adaptation to multi-channel structures, allowing a single valve to have two, three, or even four different flow channels. This simplifies piping system design, reduces the number of valves required, and minimizes the need for connecting fittings in the equipment.
A plug valve uses a plug body with a through-hole as its opening and closing element. The plug body rotates with the valve stem to achieve the opening and closing action. Small, unpacked plug valves are also known as "cocks." The plug body of a plug valve is mostly conical (though cylindrical), which mates with the conical bore surface of the valve body to form a sealing pair. Plug valves are one of the earliest types of valves, characterized by their simple structure, rapid opening and closing, and low fluid resistance. Ordinary plug valves rely on direct contact between a precision-machined metal plug and the valve body for sealing, resulting in poor sealing performance, high opening and closing force, and easy wear. They are typically only suitable for low-pressure (not higher than 1 MPa) and small-diameter (less than 100 mm) applications.
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4-Way Plug Valve
A four-way plug valve is a plug valve with four ports. By rotating the plug with specific Add to Inquiry -
Orital Plug Valve
When the valve is tuly ooened,the chaonelot olug is in algnment wth the chaonelotvalve body, which Add to Inquiry -
Lifting Type Metal Sealing Plug Valve
Process of opening and closing ofthe valve, when opening the valve, first of all,turn the hand Add to Inquiry -
Lubricated Plug Valve
Employing a pressure-balanced structure (such as the inverted pressure-balanced type), the valve Add to Inquiry -
Sleeve Type Plug Valve
Sleeve type plug valve is working as the device to cut off and connect the flow ofmedium in Add to Inquiry
Plug valves can be classified into four types according to their structure: fixed plug valve, self-sealing plug valve, plug valve, and oil-filled plug valve. According to the channel type, they can be divided into three types: straight-through plug valve, three-way plug valve, and four-way plug valve. There are also compression fitting plug valves.
Plug valves can be classified according to their application, including: soft-seal plug valves, oil-lubricated hard-seal plug valves, lift-type plug valves, and three-way and four-way plug valves.
Soft-seal plug valves are commonly used in harsh environments such as corrosive, highly toxic, and highly hazardous media, in situations where leakage is strictly prohibited, and in situations where the valve material will not contaminate the media. The valve body can be made of carbon steel, alloy steel, or stainless steel depending on the working medium.
Oil-lubricated hard-seal plug valves can be divided into conventional oil-lubricated plug valves and pressure-balanced plug valves. Special grease is injected from the top of the plug body between the valve body's conical orifice and the plug body, forming an oil film to reduce the valve's opening and closing torque, improving sealing performance and service life. Its working pressure can reach 64MPa, the maximum working temperature can reach 325 degrees, and the maximum diameter can reach 600mm.
Lift-type
Lift-type plug valves have various structural forms. [4] Lift-type plug valves are divided into soft-seal and hard-seal types according to the material of the sealing surface. The basic principle is that when opening, the plug rises, and the plug rotates 90 degrees to the fully open process, which can reduce the friction with the valve body sealing surface; when closing the valve, the plug rotates 90 degrees to the closed position and then falls to contact the valve body sealing surface to achieve sealing.
Three-way and four-way
Three-way and four-way plug valves are suitable for use in Shanghai industrial plants to change the direction of medium flow or to distribute the medium. According to the requirements of the operating conditions, soft-seal bushings or soft-seal and hard-seal lift-type plug valves can be selected.
Features: Plug valves are suitable for frequent operation, offering quick and easy opening and closing. Plug valves have low fluid resistance.
Plug valves have a simple structure, small size, light weight, and are easy to maintain. They offer good sealing performance.
They are not limited by installation direction, allowing for arbitrary media flow. They operate without vibration and with low noise.
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