Double-plate type ball valve

Abstract

The invention relates to a double-plate type ball valve which comprises a valve body, a valve cover, a left spherical surface body, a right spherical surface body, a valve rod and a driving device, wherein the left spherical surface body and the right spherical surface body are respectively connected with a left extensible rod and a right extensible rod, inclined iron is installed at one end of the valve rod, the inclined iron is connected with the left extensible rod and the right extensible rod in a linkage mode, the inclined iron is used for driving the left spherical surface body and the right spherical surface body to move along the axis direction of a valve seat through the left extensible rod and the right extensible rod when the left spherical surface body and the right spherical surface body are at a closed position of a valve, the driving device is installed at the other end of the valve rod, a driving frame is arranged in a valve cavity, and is used for driving the left spherical surface body and the right spherical surface body to rotate to the position of opening or closing of the valve, the valve rod and the driving frame are in linkage connection in modes of free sliding matching along the axial direction and driving matching along the rotary direction, the valve rod is connected with an automatic revolving mechanism in the linkage mode, and the automatic revolving mechanism can achieve automatic revolve in the process that the driving device drives the valve rod to move along the axial direction. Opening and closing of the valve of the double-plate type ball valve can be achieved in the process that the driving device drives the valve rod to move along the axial direction, rotation and lifting of the valve rod can be achieved, and can drive the left spherical surface body and the right spherical surface body to stretch out and draw back so as to enable sealing surfaces to be separated from contact, and meanwhile the opening and closing of the valve also can be achieved through rotation. The double-plate type ball valve is simple in operation, convenient to operate, and reliable.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a double-plate ball valve applied to gas and natural gas pipelines. Background technique [0002] The on-off control of traditional gas or natural gas pipelines is generally completed through the joint action of a sealed butterfly valve and a blind plate valve. When operating and controlling, two sets of coordination are required to operate separately, which is inconvenient to operate; at the same time, the blind plate valve has internal leakage. Unsafe factors, can not really completely cut off the medium. [0003] In order to solve the above problems, Chinese patent No. 90222720.3 discloses "Adjustable specific pressure water seal ball valve", which mainly consists of valve body, hand plate, pressure pointer, valve stem, direction pointer, handle, intermediate shaft, wedge-shaped slider, sliding shaft and two hemispheres, when it is necessary to cut off the gas in the pipe, tur...

AI Technical Summary

Problems solved by technology

The above-mentioned ball valve has the advantages of reliable sealing, but the opening and closing control of the valve requires two sets of independent control mechanisms, and there is still the problem that the valve stem cannot be controlled step by step to drive the rotation and radial movement of the left and right hemispheres, resulting in: 1) The ball valve is still Two sets of manual drive operation devices are required, which are coordinated step by step according to the process, and the valve structure is complex, not compact, and inconvenient to operate; 2) It needs to be operated by skilled operators who think about the order, and the operator is prone to misoperation, causing damage to the valve , leading to safety accidents in serious cases; 3) Two sets of independent manual operating mechanisms need to be operated by skilled operators with a sense of order, and it is difficult to realize automatic control of valves

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