China plug valve manufacturer,factory and supplier-Plug valves

Lift Plug Valve

China Lift plug valve manufacturer, factory and supplier, mainly produce lifting plug valve, non-lurbicated lift type plug valve, jacketed lift plug valve, high temperature lift plug valve, metal seat lift plug valve, cast steel,stainless steel lift plug valve, and customized other lift plug valves.

Lift plug valve 
adopts raising first after the opening and closing of the plug valve operating mode, which greatly reduce the Metal seated lift plug valve opening and closing torque. Lift plug valve usually adopts the circular channel to make Metal seated lift plug valve fluid resistance greatly reduced.

Lift plug valve is applicable to the cutting and connection of pipelines medium that are used in various industries such as petroleum, chemical industry, pharmacy, chemical fertilizer, power industry etc under nominal pressure of Class 150-1500 LB,and working temperature of -29-550 
.


Lift Plug Valve Specification

Size Range : NPS 1/2 to NPS 56
Pressure Range : 150LB to 1500LB

Temperature Range : -46°C to +450°C
Design Standard : API6D / API599
Face To Face Standard: ASME B16.10
Flange End Standard:ASME B 16.5
Body Material:ASTM A216-WCB A217-WC1, WC6,WC9,C5, ASTM A351-CF8,CF8M,CF3,CF3M
End Connection : RF / Threaded / BW
Operation  : Lever / Handwheel / Pneumatic / Electrical


What Is A Lift Plug Valve?

Lift plug valve has many design. Lift plug valve is divided into soft seal and hard seals according to the material of the sealing surface. The basic principle is to raise the plug when it is opened, and then rotate the plug 90 degrees to fully open the valve to reduce the friction with the sealing surface of the plug valve body; when closing the plug valve, turn the plug 90 degrees to the closed position and then lower it to seal with the plug valve body seat surface to seal.

Double Seal Lift Plug Valve
The double seal lift plug valve has a soft sealing structure. The plug is a cylindrical plug composed of three plates, and the rubber sealing surfaces are inlaid on the plates on both sides, and the cylindrical wedge plug is in the middle.
When the lift plug valve is opened, the transmission mechanism raises the plug, drives the two sides of the plate together, and then detaches the combined plug body and the valve sealing surface. Then drives the plug to rotate 90 degrees to the fully open position of the valve

When the lift plug valve is closed, the transmission mechanism rotates the combined plug 90° to the closed position, and then pushes the plug down. After the two side plates contact the bottom of the valve body, it does not move down again. The inlet and outlet ends move, so that the soft sealing surface of the side plate contacts the sealing surface of the valve body and is compressed to achieve the seal

The double sealed lift plug valve has double blocking and bleed functions. The plug valve is equipped with a pressure balancing device to prevent abnormal pressure rise of the system and reduce the resistance at the moment of valve opening and closing. Because the metal surfaces contact each other after the sealing ring is compressed, the valve has a fireproof function. The maintenance of the lift plug valve is very convenient. Without removing the plug valve body from the pipeline, the two side plates can be removed and replaced by removing the end cover at the bottom of the valve body. Therefore, doule seal lift plug valve is also widely used in various industries such as petroleum, natural gas, metallurgical mines, gas engineering, light industrial textiles, ship terminals, food and environmental water treatment for regulating and opening and closing pipeline fluids.


Metal Seated Lift Plug Valve
Metal Seated lift plug valve can be sealed on both sides of the seat sealing surface, the use of the valve is not restricted by the flow direction of the medium. When the metal seated lifting plug valve is closed, the sealing surface of the valve seat can be pressurized by the hand wheel and the stem. By increasing the specific sealing pressure, the plug valve can have better sealing performance. The sealing surface of the valve seat is convex, which is convenient for cleaning the sealing surface, and the sealing surface is not easy to accumulate crystalline medium or solid particles. It is often used in high temperature applications in chemical plants.

There are many types of metal seal lift plug valves, and there are two common types.
a. Handwheel and handle lift plug valve. 
The working principle: ascending, make the plug and valve fully open. When closing, first turn the handle to turn the cock 90 degrees to the closed position, and then turn the hand wheel to lower the cock to reach the seal.
During the opening and closing of the valve, the plug is separated from the valve seat, so the opening and closing of the valve is very easy. And the sealing surface is scratched proof during the opening or closing process. So the valve has longer life span. However, the driving torque of the handle is small, so the nominal size of the valve is usually not large. The handwheel handle lifting type plug valve has a compact structure, small volume and low fluid resistance.

b. Mechanical cross-drive lifting plug valve.
The working principle of the mechanical cross-drive lifting plug valve is that when the valve is opened, the transmission device turns the thread of the valve stem to make the plug body rise. After the sealing surfaces of the plug and the valve body are separated, the plug is driven to rotate 90 degrees until the valve is fully opened. When closing, the transmission device causes the plug to rotate 90 degrees to the closed position first, and the plug no longer rotates. After the driving force rotates the thread, the plug is lowered and comes into contact with the sealing surface of the valve body to achieve sealing.
The mechanical cross transmission mechanism can be connected to pneumatic actuator, electric motor actuator, hydraulic actuator, etc. for remote control.
The mechanical cross drive lift type plug valve solves the limitation of insufficient input torque of the driving device, and makes the valve develop toward the direction of large diameter and high pressure.
The plug passageway of the mechanical cross drive lifting plug valve is the same as the diameter of the pipeline, and the fluid resistance is small, which is convenient for pigging. The development on oil and gas long-distance pipelines is getting bigger and bigger.


Lift Plug Valve Features

Lift Plug Valve is applicable to the cutting and connection of pipelines medium that aroused in various industries as petroleum, chemical industry, pharmacy, chemical fertilizer, power industry etc.

The features is as below:

1. The product has reasonable structure, reliable sealing, excellent performance and beautiful appearance.
2. 
Opening and closing of the valve is carried out while the sealed surface is taken off so it will not cause abrasion on the sealed surface.
3. 
Its characteristic double-direction flow makes installation and use more convenient.
4.
The materials of the parts and sizes of flanges can be reasonably configured according the actual operation condition of the requirements of the customers, so as to meet the various needs of engineering.

How Does A Lift Plug Valve Work?

As for the process of opening and closing of the lift plug valve, when opening the plug valve, first of all, turn the hand wheel to make the plug lifted and separated with the sealed surface, then turn the handle by  90° to make the channel of plug to the channel of valve body, so that the lift plug valve is opened; when closing the lift plug valve, first of all, turn the handle by  90° to make the channel of plug vertical to the channel of plug valve body, and then turn the hand wheel to descend the plug, so that the plug valve is closed.

How To Install A Lift Plug Valve?

When installing the lift plug valve, in order to prevent damage to the lift plug valve and ensure the full performance of the lift plug valve, the following four points should be noted:
1) Make sure the lift plug valve is open. First heat up the pipeline and transfer as much heat as possible from the pipe to the valve. Avoid extending the heating time of the plug valve itself.
2) Use gauze or wire brush to remove the pipe and cutting parts to make the metal surface shine. The use of steel wool is not recommended.
3) First cut the pipe in the vertical direction, trim and remove burrs, and measure the pipe diameter
4) Apply flux to the outside of the pipe and the inside of the welding shield. The flux must completely cover the welding surface. Please use flux sparingly.

  • Metal seat lifting plug valve

    ( Lift type,metal seat for high temperature )

    • Port size:1/2"~16" (DN15~DN400)
    • Pressure: CL150-CL2500
    • Medium:Water,steam,oil,gas,etc.
    • Temperature:-40~450℃
    • Body material:WCB,CF8,CF8M,CF3,CF3M etc.
  • High Temperature lifting type metal seat plug valve

    ( lifting type metal seat plug valve )

    • Port size:1/2'' ~ 16''( 15mm ~ 400mm)
    • Pressure: Class 150 ~ Class 900
    • Medium:Water,oil,steam,gas
    • Temperature:-40~450℃
    • Body material:WCB CF8 CF3 CF8M CF3M or others
  • Lift type hard seat plug valve

    ( Lift type,metal seat for high temperature )

    • Port size:1/2'' ~ 16''( 15mm ~ 400mm)
    • Pressure: Class 150 ~ Class 900
    • Medium:Water,oil,steam,gas
    • Temperature:-40~450℃
    • Body material:WCB CF8 CF3 CF8M CF3M or others
  • Stainless steel lift type plug valve

    ( Different stainless steel material is optional )

    • Port size:DN50~600, NPS 2〞~ 24〞
    • Pressure: PN16 ~ 100,150LB ~ 600LB
    • Medium:Water,oil,steam,gas
    • Temperature:-40~450℃
    • Body material:CF8 CF3 CF8M CF3M or others
  • Steam jacket lift plug valve

    ( Steam jacket cover, lift structure )

    • Port size:1/2'' ~ 16''( 15mm ~ 400mm)
    • Pressure: PN16 ~ 100,150LB ~ 600LB
    • Medium:Water,oil,steam,gas
    • Temperature:-40~450℃
    • Body material:WCB WC6 WC9 CF8 CF3 CF8M CF3M
  • High temperature metal seat lift plug valve

    ( Metal seat for high temperature )

    • Port size:1/2'' ~ 16''( 15mm ~ 400mm)
    • Pressure: Class 150 ~ Class 900
    • Medium:Water,oil,steam,gas
    • Temperature:-40~450℃
    • Body material:WCB WC6 WC9 CF8 CF3 CF8M CF3M
  • Metal seated lift plug valve

    ( Metal seated, lift structure )

    • Port size:1/2'' ~ 16''( 15mm ~ 400mm)
    • Pressure: Class 150 ~ Class 900
    • Medium:Water,oil,steam,gas
    • Temperature:-40~450℃
    • Body material:WCB WC6 WC9 CF8 CF3 CF8M CF3M
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