Classification and Characteristics of Plug Valves
Plug valve is a very simple structure, and open and close quickly, resistance is also relatively small valve, plug valve is generally manipulated using the handle. When the handle of the plug valve and the valve body is parallel to the full open position, when the handle of the plug valve and the valve body is perpendicular to the full closed position, so the plug valve can not be used as a control valve.
Overview
There are many types of plug valves, generally divided into:
1. Clampyte plug valve
Valve without packing, plug and plug body sealing surface of the seal rely on tightening the plug below the nut to achieve, generally used for PN ≤ 0.6Mpa occasions.
2.Packing type
Plug body with packing, by pressing the packing to achieve the sealing surface of the plug and plug body sealing. This packing plug valve sealing performance is better, a large number of nominal pressure PN for 1.0Mpa occasions. Plug body below the screw can play a plug and plug body with the role of adjusting the tightness.
3. Self-sealing
Self-sealing plug valve plug and plug body seal, mainly relying on the medium itself to achieve the pressure, this structure is generally used for air media. Self-sealing structure below the spring can play the role of pre-tensioning and compression.
4. three-way, four-way plug valves, mostly used for the need to distribute media occasions
5. Oil filling plug valve
As a result of forced lubrication, so that the plug valve plug and plug body sealing surface between the formation of a layer of oil film, thus improving the sealing performance of the plug valve, and make the opening and closing of the valve to save energy, but also to prevent damage to the sealing surface, play a role in protecting the sealing surface. The composition of the lubricating oil used, according to the nature of the working medium and temperature.
