CN201065952Y - Corrugated pipe gate valve - Google Patents

Abstract

The utility model relates to a bellows gate valve, comprising a valve body, a gate plate, a valve stem, a bonnet and a hand wheel. The utility model is characterized in that on the periphery of the valve stem, a long-neck intermediate flange is arranged additionally between the valve body and the bonnet, wherein, a sealing bellows is arranged on the inner circumference of the intermediate flange; a fixed disc is arranged at the upper end of the bellows; the lower end of the intermediate flange is connected with the valve body, and the upper end is connected with the bonnet; sealing stuffing is arranged between the bonnet and the valve stem. The utility model solves the problem that the prior gate valve only adopts graphite stuffing for sealing and the medium cannot be controlled to achieve zero leakage for long term use. The utility model is widely applied to the pipeline flow control field of liquid and gas.

Description

Bellows gate valve

Technical field

The utility model relates to pipeline flow control field, the specifically control valve of a kind of liquid of high-seal, gas of liquid, gas.

Background technique

The social at present packing of gate valve of going up design production all is graphite packing, and long-term use can not reach zero leakage by control media.

Summary of the invention

The utility model is for solving common valve only with the graphite packing sealing, and the long-term problem of easily leaking of using is invented a kind of double-layer seal leakproof valve that has bellows.

The technical solution of the utility model is, a kind of bellows gate valve, constitute by valve body, flashboard, valve rod, valve gap, handwheel, its special way is, periphery at valve rod, install flange in the long-neck between valve body and the valve gap additional, enclose in the middle flange seal bellows is housed, fixed tray is equipped with in the upper end of bellows, and middle flange lower end and valve body connection connect, the upper end connects with valve gap, between valve gap and the valve rod stuffing box packing is housed, swing bolt, nut are equipped with in the top of valve gap, and flashboard is equipped with in the lower end of valve rod, Stem Mut is equipped with in the upper end of valve rod, Stem Mut be peripherally equipped with handwheel.

Valve closing with rise when opening, rotate handwheel by the cooperating of valve rod and nut, reach sealing with the effect of chock between push-and-pull flashboard and the valve body, make flashboard rise or descend and make valve generation switch along the valve body guide rail.Seal bellows in the long-neck between flange and the valve rod plays the primary seal effect, and during valve opening, flashboard is opened high more, and the pressure that the extruding bellows produces is big more, and the valve bonnet seal degree is high more; The secondary seal effect is played in stuffing box packing between seal bellows top valve gap and the valve rod.The degree of tightness of valve gap can be regulated by top swing bolt.

Technology technique effect of the present utility model is, adopts above-mentioned technological scheme, can realize a kind of good sealing effect, the liquid of long service life, gas valve.

Description of drawings

Fig. 1 is the structural front view of model utility, and the accompanying drawing that makes an abstract.

In the drawings, flange, 6 fixed trays, 7 bolts, 8 valve gaps, 9 fillers, 10 swing bolts, 11 nuts, 12 Stem Muts, 13 handwheels in 1 valve body, 2 flashboards, 3 bellowss, 4 valve rods, 5.

Embodiment

Below in conjunction with accompanying drawing embodiment, the utility model is further specified.

As shown in FIG., in the periphery of valve rod 4, install flange 5 in the long-neck between valve body 1 and the valve gap 8 additional, enclose in the middle flange 5 seal bellows 3 is housed, fixed tray 6 is equipped with in the upper end of bellows 3, middle flange 5 lower ends and valve body 1 connection connect, and upper end and valve gap 8 connect, and between valve gap 8 and the valve rod 4 stuffing box packing 9 are housed, swing bolt 10, nut 11 are equipped with in the top of valve gap 8, flashboard 2 is equipped with in the lower end of valve rod 4, and Stem Mut 12 is equipped with in the upper end of valve rod 4, Stem Mut 12 be peripherally equipped with handwheel 13.

Valve closing with rise when opening, rotate handwheel 13 by the cooperating of valve rod 4 and Stem Mut 12, reach sealing with the effect of chock between push-and-pull flashboard 2 and the valve body 1, flashboard 2 is risen or decline makes valve generation switch along valve body 1 guide rail.Seal bellows 3 in the long-neck between flange 5 and the valve rod 4 plays the primary seal effect, and during valve opening, flashboard 2 is opened high more, and the pressure that extruding bellows 3 produces is big more, and valve gap 8 tightnesses are high more; The secondary seal effect is played in stuffing box packing 9 between seal bellows 3 top valve gaps 8 and the valve rod 4.The degree of tightness of valve gap 8 can be by top swing bolt 10 and nut 11 fit adjustment.

Claims (1)

1. a bellows gate valve is made of valve body, flashboard, valve rod, valve gap, handwheel, it is characterized in that: in the periphery of valve rod, install flange in the long-neck between valve body and the valve gap additional, enclose in the middle flange seal bellows is housed.

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