Multi-turn valve in threaded connection with support
A threaded connection and valve technology, applied in valve details, valve device, valve shell structure and other directions, can solve the problems of easily damaged threads, heavy deformation, reduced pressing force, etc., to achieve reliable locking and fixing of brackets, and packing compression Stable force and reliable sealing performance
Inactive Publication Date: 2012-02-22
OULAM VALVE TECH CO LTD
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Problems solved by technology
Its main disadvantages are: the locking and fixing effect of the bracket is poor, and the packing gland is tightened and installed on the two jacks of the bracket by bolts and nuts. The thread of the thread produces a large pulling force, which is easy to damage the thread, which reduces the pressing force of the packing gland on the packing and affects the sealing performance between the valve stem and the bonnet.
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Embodiment Construction
[0008] Such as figure 1 The multi-turn valve with threaded connection of the bracket shown includes a valve body 1, a valve cover 3, a valve stem 2, a valve stem nut 8, and a bracket 5, and the valve stem nut 8 is axially fixedly installed in the upper inner hole of the bracket 5, and the valve stem The upper end of nut 8 is fixedly installed with hand wheel 9 by lock nut 10, and the middle screw hole is threadedly matched with valve stem 2. Between the bonnet 3 and the valve stem 2, the packing gland 6 is installed with the sealing packing 4, that is, the sealing packing 4 is installed in the stuffing box between the bonnet 3 and the valve stem 2, and the packing gland 6 is press-fitted on the upper end. The lower part of the bracket 5 is mounted on the valve cover 3 by threads, and a vertical groove is formed on the thread of the lower part of the bracket 5, and lugs 11 are respectively arranged on both sides of the vertical groove, and mounting holes are formed on the lugs ...
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The invention relates to a multi-turn valve in threaded connection with a support, which comprises a valve body, a valve cap, a valve rod, a valve rod nut and a support, wherein the valve rod nut is axially and fixedly installed in an inner hole at the upper part of the support, a gland packing is installed between the valve cap and the valve rod through a packing gland, and the lower part of the support is installed on the valve cap through threads. A plurality of circular concave holes are mainly made in the upper plane of the packing gland, corresponding threaded holes are made in the support above the circular concave holes, bolts are respectively installed in the threaded holes, and the lower end parts of the bolts are rested in the circular concave holes in the upper plane of the packing gland. The thread at the lower part of the support is provided with a vertical slot, both sides of the vertical slot are respectively provided with lugs, and mounting holes are made in the lugs. The multi-turn valve has the advantages of fixed and reliable locking, stable packing compression force, reliable sealing property between the valve rod and the valve cap and the like, is convenient to assemble, disassemble and maintain and is applicable to multi-turn valve structures of shutoff valves, gate valves and the like.
Description
technical field [0001] The invention relates to the field of valves, in particular to a support connection device for a multi-turn valve. Background technique [0002] Multi-turn valves generally include valve body, bonnet, valve disc, valve stem, handwheel and bracket. The handwheel is fixed on the stem nut, the stem nut is installed in the inner hole of the upper end of the bracket, and the lower end of the bracket is integrated with the valve cover. Casting or forging molding or fixed connection by bolts. The disadvantage of the integral connection method is that it is troublesome to disassemble and maintain. The disadvantage of the bolted connection method is that the bolts will slip and break due to fatigue after a certain period of use. The common threaded connection is basically locked and fixed by drilling two anti-retraction rivets on the thread mating surface. The disadvantage is that the force of the anti-retraction rivets is small, the locking effect is poor, and...
Claims
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IPC IPC(8): F16K27/08F16K41/02
Inventor 金志远陈子武
Owner OULAM VALVE TECH CO LTD