CN203868399U - Double-piston multi-seal self-pressure-relief ball valve - Google Patents

Abstract

A double-piston multi-seal self-pressure-relief ball valve comprises connecting bodies, a valve cover, a valve rod, a valve rod graphite ring, a valve rod O-shaped ring, a valve cover graphite ring, a valve cover O-shaped ring, valve seat O-shaped rings, a valve seat graphite ring, a valve seat spring, a valve seat, a valve body, a pressure relief valve, a fixing shaft, a composite bearing and a ball. The whole ball valve is of a three-section type structure, the connecting bodies are arranged at the two ends of the valve body, the pressure relief valve is arranged outside a middle cavity of the valve body, the valve rod is mounted on the upper portion of the ball, and a sealing structure formed by the V-shaped valve rod graphite ring and the valve rod O-shaped ring is arranged at the contact portion of the lower portion of the valve rod and the valve cover; the V-shaped valve cover graphite ring and the valve cover O-shaped ring are arranged at the contact portion of the valve cover and the valve body to seal the valve cover; two valve seat O-shaped rings and the V-shaped valve seat graphite ring are arranged on the valve seat, the two valve seat O-shaped rings seal double pistons of the valve seat, a sealing ring is arranged between the valve seat and the valve body, the valve seat spring is arranged on the rear side of the valve seat, and the valve seat spring supports the V-shaped valve seat graphite ring to form a sealing structure for the back of the valve seat, so that continuous leak tightness is ensured.

Description

Double-piston seals from pressure relief ball valve more

Technical field

The utility model relates to a kind of ball valve, and particularly a kind of double-piston seals from pressure relief ball valve more, the no matter magnitude of pressure differential before and after ball valve, and the poor sealing of total head can independently be born in the every one end of valve, and can ensure that upstream and downstream seals simultaneously, guarantees continuously without leaking.

Background technique

Valve is as the crucial control mechanism of pipeline, require stricter, the advantages such as ball valve is little with its flow resistance, compact structure are widely used in rock gas, Coal Chemical Industry, oil pipeline, present double-piston ball valve is in the time that ball valve is closed, no matter wherein cavity pressure greatly or manifold pressure is large, and its valve is all pushed to spheroid.There is better sealing effect.Can be in the time that external temperature raise, can make the sealing lumen of double-piston ball valve produce superpressure phenomenon, once be to carry flammable medium, will there is security hidden trouble not from decompression function in it, serious leakage or blast even occurs.

Model utility content

For the deficiency of existing product design, the utility model provides a kind of double-piston to seal from pressure relief ball valve more, comprises connecting body, valve gap, valve rod, valve rod graphite annulus, valve rod O type circle, valve gap graphite annulus, valve gap O type circle, valve seat O type circle, valve seat graphite annulus, seating spring, valve seat, valve body, Decompression valves, stationary axle, composite bearing, spheroid.

The utility model solves the technological scheme that its technical problem adopts: whole valve is three stage structure, and connecting body is established at valve body two ends, and valve body is that flange-type is connected with connecting body, and valve body lumen outside arranges a Decompression valves; Valve rod is installed on spheroid top, and stem lower portion and valve gap contact segment are provided with V-arrangement valve rod graphite annulus, valve rod O type circle forms sealing configuration; Valve gap and valve body contacting point are provided with V-arrangement valve gap graphite annulus, valve gap O type circle, and valve gap is formed to sealing; Valve seat is provided with two valve seat O type circles and a V-arrangement valve seat graphite annulus, two valve seat O type circles form the sealing of valve seat double-piston, between valve seat and spheroid, are provided with seal ring, and valve seat rear side is provided with seating spring, under the support of seating spring, V-arrangement valve seat graphite annulus forms valve seat back seal structure.

The beneficial effects of the utility model are: the poor sealing of total head can independently be born in the every one end of valve, and carries out from pressure release, and can ensure that upstream and downstream seals simultaneously, guarantee that nothing is leaked continuously, extend the working life of valve.

Brief description of the drawings

Fig. 1 is structural representation of the present utility model; Fig. 2 is valve seat construction schematic diagram of the present utility model;

In figure, 1, connecting body, 2, valve gap, 3, valve rod, 4, valve rod graphite annulus, 5, valve rod O type circle, 6, valve gap graphite annulus, 7, valve gap O type circle, 8, valve seat O type circle, 9, valve seat graphite annulus, 10, seating spring, 11, valve seat, 12, valve body, 13, Decompression valves, 14, stationary axle, 15, composite bearing, 16, spheroid.

Embodiment

As shown in the figure, the utility model patent comprises connecting body 1, valve gap 2, valve rod 3, valve rod graphite annulus 4, valve rod O type circle 5, valve gap graphite annulus 6, valve gap O type circle 7, valve seat O type circle 8, valve seat graphite annulus 9, seating spring 10, valve seat 11, valve body 12, Decompression valves 13, stationary axle 14, composite bearing 15, spheroid 16.Whole valve is three stage structure, and connecting body 1 is established at valve body 12 two ends, and valve body 12 and connecting body 1 are connected for flange-type, valve body 12 lumen outsides arrange a Decompression valves 13, as lumen pressure anomaly raises, Decompression valves 13 meeting releasing pressure automaticallies, are provided with spheroid 16, seal ring, valve seat 11 in valve body 12 chambeies; Spheroid 16 bottoms are provided with groove, and at the bottom of ball, groove is square structure, are provided with composite bearing 15 in groove, and stationary axle 14 one end are connected to the composite bearing 15 in groove; Spheroid 16 tops are provided with groove, valve rod 3 bottoms embed groove, valve rod 3 is connected with actuator through valve gap 2, valve rod 3 bottoms and valve gap 2 contact segments are provided with V-arrangement valve rod graphite annulus 4, valve rod O type circle 5, valve rod graphite annulus 4, valve rod O type circle 5 form sealing configuration, thereby guarantee the sealing effect of valve rod 3; Valve gap 2 is provided with V-arrangement valve gap graphite annulus 6, valve gap O type circle 7 with valve body 12 contacting points, guarantees the sealing effect of valve gap 2; Valve seat 11 is provided with two valve seat O type circles 8 and 9, two valve seat O type circles 8 of a V-arrangement valve seat graphite annulus form the sealing of valve seat double-piston, and V-arrangement valve seat graphite annulus 9 coordinates valve seat 11 motions to form valve seat part multi-sealing structure; Between valve seat 11 and spheroid 16, be provided with seal ring, valve seat 11 rear sides are provided with seating spring 10, and seating spring 10 ends and valve body 12 are inconsistent, under the support of seating spring 10, no matter valve is under which kind of state, and V-arrangement valve seat graphite annulus 9 forms valve seat back seal structure.

Claims (3)

1. a double-piston seals from pressure relief ball valve more, comprise connecting body, valve gap, valve rod, valve rod graphite annulus, valve rod O type circle, valve gap graphite annulus, valve gap O type circle, valve seat O type circle, valve seat graphite annulus, seating spring, valve seat, valve body, outlet valve, stationary axle, composite bearing, spheroid, it is characterized in that: whole valve is three stage structure, connecting body is established at valve body two ends, valve body is that flange-type is connected with connecting body, and valve body lumen outside arranges a Decompression valves; Stem lower portion and valve gap contact segment are provided with V-arrangement valve rod graphite annulus, valve rod O type circle forms sealing configuration; Valve gap and valve body contacting point are provided with V-arrangement valve gap graphite annulus, valve gap O type circle, and valve gap is formed to sealing; Valve seat is provided with two valve seat O type circles and a V-arrangement valve seat graphite annulus, between valve seat and spheroid, is provided with seal ring, and valve seat rear side is provided with seating spring.

2. double-piston according to claim 1 seals from pressure relief ball valve more, it is characterized in that: two described valve seat O type circles form the sealing of valve seat double-piston.

3. double-piston according to claim 1 seals from pressure relief ball valve more, it is characterized in that: under the support of described seating spring, V-arrangement valve seat graphite annulus forms valve seat back seal structure.