Spherical body longitudinal single-weld seam all-welded ball valve

Abstract

The invention discloses a spherical body longitudinal single-weld seam all-welded ball valve which comprises a left valve body and a right valve body; the left valve body and the right valve body arefixed through a pin shaft and a support plate; a spherical body is arranged in hollow parts of the left valve body and the right valve body; valve seat assemblies are arranged on the left side and theright side of the spherical body; a bearing is arranged between the support plate and the spherical body; a valve rod is arranged at the top of the spherical body; the outer side of the valve rod issleeved with a valve neck; a distance ring is arranged between the valve neck and the valve rod; a flat key is fixed to the top outer side of the valve rod through bolts; a connection disc is arrangedbetween the flat key and the valve neck; the connection disc and the valve neck are fixed through the pin shaft and bolts; the middle part and the bottom of the valve rod are in contact communicationwith the connection disc and the spherical body through a static spring and a static steel ball correspondingly; grease injection valves are arranged on the left valve body and the right valve body;an emptying valve is arranged on the right valve body; and a blowdown valve assembly is arranged at the bottom of the right valve body. The spherical body longitudinal single-weld seam all-welded ballvalve has the characteristics of simple structure, good sealability and long service life.

Description

technical field [0001] The invention belongs to the technical field of ball valves, in particular to a full-welded ball valve with a longitudinal single seam of a spherical body. Background technique [0002] Ball valves are mainly used in oil and natural gas pipelines, chemical plants, fire pipelines, offshore oil platforms, etc. The structure of fully welded ball valves is generally divided into three-body and fixed ball. The working principle of the fully welded ball valve: the fully welded ball valve uses a ball with a circular channel as the opening and closing part, and the ball rotates 90 degrees around the axis of the valve stem with the rotation of the valve stem to achieve the purpose of opening and closing. [0003] The problems and shortcomings of the ball valve in the prior art are as follows: [0004] a) At present, all the traditional barrel-shaped three-body fully welded ball valves are used on the pipeline. The blanks of this structure are basically free f...

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Problems solved by technology

[0004] a) At present, all the traditional barrel-shaped three-body fully welded ball valves are used on the pipeline. The blanks of this structure are basically free forging, which is large in size, large in machining allowance, and relatively high in production costs, resulting in waste of resources. heavy weight

[0005] b) Due to the barrel-shaped three-body structure, the number of welds increases, welding materials are wasted, welding efficiency is low, and there is an extra leak point, which directly affects the safety performance and service life of the product

[0006] c) Generally, the upper and lower valve stem structures are used. The thrust of the medium on the ball directly acts on the valve stem, and the valve stem bears torsional stress and bending stress. The increase in torque of large-diameter fully welded ball valves affects the service life of the valve.

[0007] d) The blowdown valve is directly installed at the bottom of the valve body. After the all-welded ball valve has been used for a long time, the inner cavity of the valve body needs to be cleaned. Tired and unsafe, which brings inconvenience to on-site maintenance

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