Polyethylene all-plastic ball valve formed by hot melt socket welding

A technology of socket welding and plastic ball valves, which is applied in the direction of valve details, valve devices, and valve shell structures, can solve the problems of small pre-tightening force on the sealing surface, small socket depth, and affecting the axial distance of the sealing surface, etc. Tight force maintains consistent effect
CN101581376BActive Publication Date: 2013-01-16GUANGDONG LIANSU TECH INDAL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGDONG LIANSU TECH INDAL
Publication Date
2013-01-16

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Abstract

The invention relates to a pipeline cut-off valve, in particular to a polyethylene all-plastic ball valve formed by hot melt socket welding. The ball valve comprises a valve rod, a valve body, a valveball, a stub tube, a first valve ball sealing ring and a second valve ball sealing ring, wherein, the valve ball is arranged in the valve body, and the valve rod which rotates the valve ball is arranged thereon; the first valve ball sealing ring is fixed between the valve body and the valve ball, and the second valve ball sealing ring is fixed between the stub tube and the valve ball; the stub tube and the valve body are in hot melt socket-type connection, the inner surface of the insertion chamber of the valve body is provided with a melt glue surface of the valve body, and the outer surfaceof the stub tube is provided with a melt glue surface of the stub tube; and the valve body is matched with the stub tube and is provided with an axial positioning structure used for positioning the axial depth of the stub tube inserted into the valve body. The axial positioning structure of the invention guarantees the axial depth of the stub tube inserted into the valve body, thereby guaranteeing the axial spacing of sealing faces formed by the two valve ball sealing rings, and enabling the pretightening force of each sealing face to be consistent with the designed pretightening force.
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Description

technical field

[0001] The invention relates to a pipeline cut-off valve, in particular to a polyethylene all-plastic ball valve for hot-melt socket welding. Background technique

[0002] Polyethylene (PE) all-plastic ball valves are free from corrosion and aging, with a service life of up to 50 years, while metal valves can last up to 25 years; PE valves can be hot-melt connected with PE pipes, and the joints have high strength and no leakage; and can be directly Buried, no need to build valve wells. Compared with metal ball valves, the construction period for connection with the pipe network is short, the valve is light in weight, easy to carry and weld, and the welding quality can be directly observed without complicated non-destructive testing. It has been widely used in developed countries such as Europe, America, Japan and South Korea.

[0003] The small-diameter PE ball valves are integrated by hot-melt welding, and the large-diameter valves are welded by electrofus...

Claims

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