CN203453492U

CN203453492U - Bidirectional sealing butterfly valve

Info

Publication number: CN203453492U
Application number: CN201320576313.2U
Authority: CN
Inventors: 柳温柔; 樊彦军; 蔡承福; 柳亲亲; 王陈
Original assignee: TIANTE VALVE GROUP CO Ltd
Current assignee: Tete Valve Ltd By Share Ltd
Priority date: 2013-09-17
Filing date: 2013-09-17
Publication date: 2014-02-26
Anticipated expiration: 2023-09-17

Abstract

The utility model discloses a bidirectional sealing butterfly valve which comprises a valve body, a valve rod, a butterfly plate, a worm dynamic head and an end cover, wherein the end cover is fixed at the lower end of the valve body; the valve rod penetrates through the valve body to be fixed with the butterfly plate; the upper end of the valve rod penetrates through a bracket to be connected with the worm dynamic head; a filler is arranged between the valve body and the valve rod and is compacted through a filler gland; a pressing ring and a screw press a sealing ring on the butterfly plate to form a sealing pair; a floating valve seat is arranged in the sealing pair; O-shaped rings are arranged in a groove in one end surface of the floating valve seat and a groove in one outer side surface of the floating valve seat; four stop blocks are welded on the valve body so as to realize positioning and guiding functions. Due to the structural design, under the action of dielectric strength, the floating valve seat can generates a displacement along the directions of the stop blocks, so that two sealing surfaces are kept matched all the time and are not affected by pressure; the zero leakage can be implemented.

Description

Bidirectional sealed butterfly valve

Technical field

The utility model belongs to valve technology field, relates to a kind of bidirectional sealed butterfly valve.

Background technique

At present, butterfly valve is a kind of as block valve, because the advantages such as little, lightweight easy to operate, reliable, the good seal performance of its compact structure, volume, long service life have been widely used in the industries such as electric power, waterpower, chemical industry, oil refining, metallurgy.Existing butterfly valve, its sealing surface is direct built-up welding fixed valve base on valve body, and valve shaft hole forms by joining Boring mode, and seal ring is fixed on butterfly plate by pressure ring.This butterfly valve is under the working state of oppositely exerting pressure, because machining error in course of working is inevitable, thereby cause valve body and butterfly plate axis hole coaxiality deviation, between valve shaft and valve body axis hole, there is gap, while having gap and medium to the thrust of seal ring between valve shaft and butterfly plate axis hole, seal ring produces micro-deformation, thereby is difficult to realize oppositely sealing.

Model utility content

The purpose of this utility model is to provide a kind of bidirectional sealed butterfly valve, has solved the incomplete technical problem of reverse sealing in prior art.

The technological scheme that the utility model adopts is to provide a kind of bidirectional sealed butterfly valve, comprise valve body, valve rod, butterfly plate, the moving head of snail and end cap, described end cap is fixed on valve body lower end, described valve rod is fixed through valve body and butterfly plate, valve rod upper end is connected through the moving head of support and snail, between described valve body and valve rod, be provided with filler, by Gland, compress, pressure ring and screw are pressed on seal ring on butterfly plate, to form a sealing pair, inside at sealing pair is provided with floating valve seat, is all provided with O type circle in the groove of this floating valve seat end face and the groove of outer side surface.

Described floating valve seat can produce displacement under the effect of medium power, sealing surface can be fitted tightly, floating valve seat is installed to valve body the inside, by being arranged on the O type circle of floating valve seat end face and outer side surface, realize the sealing of floating valve seat and valve body, by using this floating valve seat, removed in the past sealing surface from valve body directly during built-up welding fixed valve base, the valve shaft causing due to machining error and the micro-deformation of the gap between axis hole and seal ring, realize reverse sealingly secure reliable, deducted in order to process this fixed valve base required some process equipments and mould simultaneously, facilitated processing and produced.

Between described valve body and floating valve seat, weld four blocks, block and floating valve seat gap are 1mm, prevent that floating valve seat from being released by medium, and floating valve seat just can rely on seal ring with the thrust of medium like this, and the larger laminating of pressure is tighter, more easily sealing.

The beneficial effects of the utility model are: processing technology is convenient, do not need to add process equipment, do not need new mold, made up the valve shaft that causes due to machining error and the gap between axis hole and seal ring micro-deformation, to realize reverse sealingly secure reliable, thereby realized the two way sealed of butterfly valve.

Accompanying drawing explanation

Fig. 1 is that master of the present utility model looks sectional structure schematic diagram;

Fig. 2 is the structural representation of floating valve seat of the present utility model and valve body connecting place;

Wherein: 1. screw, 2. end cap, 3. pad, 4. valve body, 5. valve rod, 6.O type circle, 7. floating valve seat, 8. seal ring, 9. screw, 10. pressure ring, 11. butterfly plates, 12. taper pins, 13. blocks, 14. straight pins, 15. fillers, 16. bolts, 17. nuts, 18. supports, 19. snails move head, 20. flat keys, 21. double-screw bolts, 22. nuts, 23. Glands.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.

The utility model bidirectional sealed butterfly valve, comprise valve body 4, valve rod 5, butterfly plate 11, moving 19 of snail and end cap 2, described end cap 2 is fixed on valve body 5 lower ends by screw 1 and pad 3, described valve rod 5 slightly 12 is fixed with butterfly plate 11 by circular cone through valve body 4, valve rod upper end is connected by flat key 20 through moving 19 of support 18 and snail, this support 18 is connected by moving 19 of bolt 16 and nut 17 and snail, between described valve body 4 and valve rod 5, be provided with filler 15, by Gland 23, compress, this Gland 23 is fixed on valve body 4 by double-screw bolt 21 and nut 22, described butterfly plate 11 slightly 12 is fixed on valve rod 5 by circular cone, pressure ring 10 and screw 9 are pressed on seal ring 8 on butterfly plate 11, to form a sealing pair, in the inside of sealing pair, be provided with floating valve seat 7, in the groove of these floating valve seat 7 end faces and the groove of outer side surface, be all provided with O type circle 6.

Between described valve body 4 and floating valve seat 7, weld four blocks 13, between each block 13, equidistantly arrange, block 13 is 1mm with floating valve seat 7 gaps, prevents that floating valve seat 7 from being released by medium; Block 13 is connected with floating valve seat 7 use straight pins 14, and straight pin 14 is stationary fit with block 13, and straight pin 14 coordinates for moving with floating valve seat 7.Floating valve seat 7 can be done upper and lower displacement under the active force of medium, because the effect (location and guiding) of straight pin 14 is not selected wrongly installed position so floating valve seat 7 can not produce.Floating valve seat 7 just can rely on seal ring 8 with the thrust of medium like this, and the larger laminating of pressure is tighter, more easily sealing.

Before work, need to process valve body 4 and floating valve seat 7, reached the condition of required work, be below process step:

1) on valve body 4, add the groove of frock floating valve seat 7, because floating valve seat 7 groove location will coordinate with O type circle 6, require machining accuracy (roughness) to be not less than 1.6;

2) processing floating valve seat 7, there is oblique tire processing, line location, for preventing that built-up welding sealing surface floating valve seat 7 from producing distortion, during built-up welding sealing surface, floating valve seat 7 is contained in built-up welding on oblique tire, after rough turn floating valve seat sealing surface and processing O type ring recess complete, floating valve seat 7 is contained on valve body, and spot welding, then finish turning floating valve seat sealing surface;

3), after sealing surface of seat and the fine finishing of seal ring sealing surface complete, join the valve shaft hole of boring valve body 4 and butterfly plate 11;

4) spot welding point of floating valve seat 7 and valve body 4 is picked out, block 13 is welded on valve body 4;

5) design block 13 is 1mm with floating valve seat 7 gaps, and realizing floating valve seat 7 can move up and down, and reaches the effect of reverse sealing.

Complete after above-mentioned steps, moving 19 of operation snail, rotates its band ovable valve stem 5, and valve rod 5 drives butterfly plate 11 and seal ring 8 to rotate, and realizes and opening and closing.In primary seal direction, now be conducive to the sealing of valve, by medium active force, promote butterfly plate 11, in the situation that each component strength and stiffness allow, can more close tighter, the seal pressure of the higher generation of pressure medium is larger, forms and seals more reliably to realize good sealing effect.In the time of oppositely, medium acts on butterfly plate 11, because there is gap between valve rod 5 and valve body 4, butterfly plate 11 can be with MEDIA FLOW to producing a displacement, at this moment floating valve seat 7 also can produce a displacement with block 13 directions, to guarantee that two sealing surfaces keep identical constantly, the restriction that is not stressed, can realize zero leakage.

Claims

1. bidirectional sealed butterfly valve, comprise valve body (4), valve rod (5), butterfly plate (11), the moving head of snail (19) and end cap (2), it is characterized in that: described end cap (2) is fixed on valve body (5) lower end, described valve rod (5) is fixing through valve body (4) and butterfly plate (11), valve rod (5) upper end is connected with the moving head of snail (19) through support (18), between described valve body (4) and valve rod (5), be provided with filler (15), filler (15) compresses by Gland (23), pressure ring (10) and screw (9) are pressed on a sealing pair of the upper formation of butterfly plate (11) by seal ring (8), in the inside of sealing pair, be provided with floating valve seat (7), in the groove of this floating valve seat (7) end face and the groove of outer side surface, be all provided with O type circle (6).

2. bidirectional sealed butterfly valve according to claim 1, is characterized in that: between described floating valve seat (7) and valve body (4), weld four blocks (13), between each block (13), equidistantly arrange.

3. bidirectional sealed butterfly valve according to claim 2, is characterized in that: described block (13) is 1mm with floating valve seat (7) gap.