Plug valves are valves which can be opened or closed by rotating 90 degrees to connect or separate the hollow passageway of the plug with that of the valve body.
Its plug can be cylindrical or conical in shape. In the cylindrical plug, the passageway is generally rectangular, while in the conical plug, the passageway is trapezoidal. These shapes make the structure of the plug valve light. It is most suitable for cutting off and connecting medium, and also shunting. But it sometimes can be used for throttling depending on the nature of the application and the erosion resistance of the sealing surface.
1. The plug valve is used for regular operation, and it can be opened and closed quickly and conveniently.
2. The fluid resistance of the plug valve is small.
3. The plug valve has the advantages of simple structure, small volume, light weight and easy maintenance.
4. Good sealing performance.
5. Without the limitation of installation direction, the flow direction of medium can be arbitrary.
6. No vibration and low noise.
The special grease is injected between the taper hole and the plug body from the top of the plug body to form an oil film to reduce the opening and closing torque of the valve and improve the sealing performance and service life of the valve. The working pressure can reach 64mpa, the max. working temperature can reach 325 ℃, and the max. diameter can reach 600mm.
Sleeve type soft sealing plug valves are often used in corrosive, highly toxic and highly hazardous media and other harsh environment, such as occasions that leakage is strictly prohibited, or where the valve material will not pollute the medium. The valve body material can be carbon steel, alloy steel and stainless steel according to the working medium.
A lift plug valve has many kinds of structures. According to the sealing surface material, it can be divided into the soft sealing plug valve and the hard sealing plug valve. The basic principle is that when the valve is opened, the plug will rise with rotation at 90 degrees until the valve is fully opened, which can reduce the friction with the sealing surface of the valve body. When the valve is closed, rotate the plug at 90 degrees to the close position and then drop down the plug to contact with the sealing surface of the valve body to achieve sealing.
Standard: API, DIN, JIS, GB, ANSI.
Material: Stainless Steel, Carbon Steel, Brass, Bronze, Alloy Steel, Titanium, 904l, Ductile Iron, Cast Iron, Cast Steel.
Size: 1/2" ~24", DN15~DN600.
Pressure: 150LB~1500LB, PN10~PN320.
Type: Threaded, Lubricated, Sleeved, Lined, 3 Way, Lift, Double Block & Bleed, Full Port, Eccentric, Metal Seated, PTFE Seated, Pressure Balanced, Flanged, Steam Jacketed, Cryogenic, Low Tempreature, Moterized, Pneumatic.
Plug valves are valves with round or conically tapered "plugs" which may be rotated within the valve body to manage flow with the valve. The plugs in plug valves have a number of hollow passageways going sideways with the plug, to ensure that fluid can flow with the plug once the valve is open.
Plug valves are pretty straight forward and frequently economical.Once the plug is conically tapered, the stem/handle is usually connected to the bigger diameter finish from the plug. Plug valves tend not to have bonnets but frequently possess the finish from the plug using the handle uncovered or mostly uncovered towards the outdoors. In such instances, there's not often a stem. The stem and take care of frequently come successfully, frequently an easy, roughly L-formed handle connected to the finish from the plug. Another finish from the plug is frequently uncovered towards the outdoors from the valve too, however with a mechanism that maintains the plug in your body.
The easiest and many common general kind of plug valve is really a 2-port valve with two positions: available to allow flow, and shut (closed) to prevent flow. Ports are openings within the valve body by which fluid can enter or leave. The plug in this sort of valve has one passageway dealing with it. The ports are usually at opposite ends from the body therefore, the plug is rotated a 4th of the full use vary from available to shut positions. This will make this sort of plug valve one fourth-turn valve. There's frequently a mechanism restricting motion from the handle to some quarter turn, although not in glass stopcocks.Slightly conically tapered metal (frequently brass) plug valves are frequently utilized as simple shut-off valves in household gas lines.It's also feasible for a plug valve to possess greater than two ports. Inside a 3-way plug valve, flow in one port might be forwarded to either the 2nd or third port. A 3-way plug valve may be made to shift flow between ports 1 and a pair of, 2 and three, or one and three, and perhaps even connect the 3 ports together.
The flow-directing options in multi-port plug valves are the same options in corresponding multi-port ball valves or corresponding multi-port valves having a rotor. Yet another possibility in plug valves may be the get one port somewhere from the plug valve and 2 ports on the other hand, with two diagonal and parallel fluid pathways within the plug. Within this situation the plug could be rotated 180° for connecting the main harbour around the one for reds either to of these two ports on the other hand.