Movable combination valve

Abstract

The invention relates to a movable composite valve formed by a stop valve and a ball valve, wherein, the cage sheath of stop valve is movably connected to the valve base; the valve base is movably connected with the valve body; the cage sheath has stuff holes; the valve element is movable; the valve rod is formed by lower stop valve rod and upper stop valve rod connected with spline; the upper stop valve rod is fixed with an active gear and an active cam while the active cam is above the active gear; the lower ball valve rod and upper ball valve rod of ball valve are connected via the connecting sheath; the upper valve rod is fixed with an inactive cam above the inactive gear; the inactive cam and the inactive gear are arranged with a clutch; the inactive gear is connected with the screw of upper ball valve rod; the active gear of stop valve is meshed with the inactive gear of ball valve; the active cam of stop valve is meshed with the inactive cam of ball valve. The cage sheath and the valve base are separated, with controlled quality and repaired property on site. And the invention uses cam device to improve the accuracy of seal position of ball.

Description

technical field [0001] The invention relates to a compound valve, in particular to a movable compound valve. Background technique [0002] In the high-temperature and high-pressure systems of electric power, petroleum, chemical industry and other industries, high-temperature and high-pressure valves are usually used in large quantities. Due to the harsh working conditions of the system, internal leakage of the valve often occurs in a short period of time or in the case of very few operations. Once the valve Internal leakage, due to the scouring effect, the valve will fail quickly, which will bring huge energy waste and economic loss to the user. As we all know, the cut-off valve is mainly cut off by the sealing of the valve core and the valve seat. One side of the composite valve is a cut-off valve and the other is a ball valve. [0003] The tightness of the block valve is mainly determined by the structure of the valve seat. From the perspective of domestic and foreign va...

AI Technical Summary

Problems solved by technology

The welded valve seat has the following disadvantages: 1. Due to the deep packing hole, machining is more difficult, especially for small-diameter DN10, DN15, DN20 and other valves with small apertures, and the processing is more difficult; 2. The welding quality is difficult to control, especially the clamping Ballast, air holes, and cracks are not easy to be found in time during welding, resulting in reverse work and low product qualification rate; 3. Due to the action of welding stress, it is difficult to guarantee 100% no cracks even if it is tempered in time. The STL alloy material commonly used at home and abroad It is difficult to control the welding quality; 4. Due to the irregularity of the valve body, the deformation is large under high temperature conditions, and the design roundness and ovality of the valve seat cannot be guaranteed, resulting in the valve not being sealed; 5. The welded valve seat used is in the system, there is no Those that are not washed out, especially the traditional single-stem and seat valves, are more severely washed out. If the washout is slight, the equipment can be repaired on site. If the washout is severe, the valve must be cut off and re-welded, and cannot be replaced on site.

[0004] Currently used compound valves usually use two pairs of gears to achieve two actions. When the ball seal is closed, the sector gear cannot be completely disengaged, resulting in inaccurate positioning of the ball seal and a large positioning error of the pull rod, which is very easy to get stuck. I can't pull it out, so I can't realize the action at all.

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