A valve body of a polyethylene ball valve

Abstract

The invention discloses a valve body of a polyethylene ball valve, and relates to the technical field of polyethylene ball valves. The valve body of the polyethylene ball valve at least comprises a valve seat, a valve element arranged in the valve seat and a valve rod used for driving the valve element, a medium channel is arranged in the valve seat, the valve element is arranged in the medium channel of the valve seat, and a leak checking sealing cover is further included; a sliding sleeve is embedded into one end of the interior of the medium channel, the sliding sleeve and the medium channel are arranged coaxially, the outer wall of the sliding sleeve is fixed to the inner wall of the medium channel in a sealing mode, an internal thread segment and a smooth segment are arranged in the sliding sleeve, and the internal thread segment is located on an opening side of the end of the medium channel; the leak checking sealing cover is sequentially divided into a sealing segment, an external thread segment and a limiting segment from front to back, and the sealing segment can be in sliding sealing fit with the smooth segment in the sliding sleeve; the external thread segment can be screwed and fixed with the internal thread segment in the sliding sleeve; and a gas conveying channel is arranged on the leak checking sealing cover in a penetrating through the front end surface and therear end surface mode. According to the valve body of the polyethylene ball valve, when the valve element shifts, leakage possibility can be further reduced, and gas tightness teat can be carried outconveniently.

Description

technical field [0001] The invention relates to the technical field of polyethylene ball valves, in particular to a valve body of a polyethylene ball valve. Background technique [0002] Polyethylene ball valves are plastic ball valves, which are mainly used in natural gas pipeline networks. They have the advantages of easy installation and low corrosion resistance. [0003] During the use of this type of ball valve, when the valve core is in a closed state, due to the different air pressures on both sides of the valve core, the valve core will shift to the side with the lower air pressure. At this time, the valve on the side with higher air pressure will The extrusion force between the core and the side sealing ring will be reduced, and there will be a possibility of leakage. Moreover, when the valve core deviates, the valve stem connected to the valve core will be subjected to a transverse shear stress, which not only easily damages the valve stem, but also easily causes ...

AI Technical Summary

Problems solved by technology

[0003] During the use of this type of ball valve, when the valve core is in a closed state, due to the different air pressures on both sides of the valve core, the valve core will shift to the side with the lower air pressure. At this time, the valve on the side with higher air pressure will The extrusion force between the core and the side sealing ring will be reduced, and there will be a possibility of leakage

Moreover, when the valve core deviates, the valve stem connected to the valve core will be subject to a transverse shear stress, which will not only easily damage the valve stem, but also easily cause leakage at the joint of the valve stem.

Images