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

A technology of socket welding and plastic ball valves, which is applied to valve details, valve devices, valve shell structures, etc., can solve the problems of small pre-tightening force on the sealing surface, affecting the pre-tightening force and large pre-tightening force on the sealing surface of the valve ball, etc. , to achieve the effect of keeping the preload consistent

Active Publication Date: 2009-11-18
GUANGDONG LIANSU TECH INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this structure is that the socket depth directly affects the axial distance between the two sealing surfaces, and affects the pre-pressing force of the valve ball sealing surface.
The socket depth is large, the pre-tighten

Method used

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

Examples

Experimental program
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Effect test

Embodiment Construction

[0018] like figure 1 , a hot-melt socket welded polyethylene all-plastic ball valve, including a valve cap 1, a valve stem 2, a valve body 4, a valve ball 7, a connecting seat 8, a first valve ball seal ring 11, a second valve ball seal ring 5. The valve ball 7 is set in the valve body 4, and the valve ball 4 is provided with a valve stem 2 for rotating the valve ball 7, and a valve stem axis sealing ring 3 is provided between the valve stem 2 and the valve body 4; the first valve The ball sealing ring 11 is fixed on the side of the valve body 4 with the connecting pipe through the nesting of the first sealing ring installation ring 12 and the valve body 4, so as to realize the sealing between the connecting pipe end of the valve body 4 and the valve ball 7; the second valve ball The sealing ring 5 is nested in the tube of the connecting seat 8 through the second sealing ring mounting ring 6 to realize the sealing between the connecting seat 8 and the valve ball 7 . The socke...

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PUM

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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.

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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Application Information

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IPC IPC(8): F16K5/06F16K27/06F16K27/10F16K41/02
Inventor 杨继跃黄虹宾
Owner GUANGDONG LIANSU TECH INDAL
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