CN210566405U

CN210566405U - Combined sealing valve seat

Info

Publication number: CN210566405U
Application number: CN201921567678.2U
Authority: CN
Inventors: 陈迪; 孙钦; 陈林; 朱春丽; 闫嘉钰
Original assignee: China National Offshore Oil Corp CNOOC; Beijing Research Center of CNOOC China Ltd
Current assignee: China National Offshore Oil Corp CNOOC; Beijing Research Center of CNOOC China Ltd
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2020-05-19
Anticipated expiration: 2029-09-20

Abstract

The utility model discloses a combination seal disk seat. The combined sealing valve seat comprises an inner valve seat and an outer valve seat which are in sealing fit; and a sealing press ring and a sealing ring are arranged between the inner valve seat and the outer valve seat, and the other side surface of the sealing press ring is attached to the sphere. The utility model discloses the combination seal disk seat, first one main seal realize the water pressure seal zero leakage for metal is sealed firmly, and the secondary seal is the soft seal, and as the high-pressure seal secondary seal, can effectual compensation spheroid warp, realize the high-pressure seal zero leakage, and the tertiary secondary seal can effectively clear away the foreign matter attached to the spheroid surface when the switch, ensures the normal switch of valve. The novel combined seal can realize one-time assembly of high-pressure air seal and zero leakage, effectively avoids repeated disassembly and assembly of the valve and repair grinding, and solves the problem of leakage of the high-pressure air seal of the valve on site.

Description

Combined sealing valve seat

Technical Field

The utility model relates to a combination seal disk seat belongs to oil and gas industry valve technical field.

Background

In natural gas production and storage wellhead devices, high pressure hard seal ball valves are often required due to the sand particles contained in the produced natural gas. Traditional hard seal disk seat, metal are to the hard seal of metal, because spheroid deformation under the processing and the grinding precision of spheroid and disk seat and high pressure, the high-pressure gas seal test is difficult to pass, and the big bore high pressure hard seal ball valve high-pressure gas seal leakage problem is more outstanding, and the not tight pipeline that causes great potential safety hazard of scene valve seal is unfavorable for the long-term safe operation of whole well head system.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a combination seal disk seat solves the big problem that heavy-calibre normal atmospheric temperature high pressure seals ball valve high-pressure gas and seals the leakage.

The utility model provides a combined sealing valve seat, which comprises an inner valve seat and an outer valve seat which are in sealing fit; and a sealing press ring and a sealing ring are arranged between the inner valve seat and the outer valve seat, and the other side surface of the sealing press ring is attached to the sphere.

In the combined sealing valve seat, a groove is arranged on the inner valve seat, and the sealing ring is arranged in the groove; the trench may be a triangular trench.

In the combined sealing valve seat, the sealing ring is an O-shaped sealing ring or a triangular sealing ring.

In the combined sealing valve seat, the sealing press ring can be a metal sealing press ring.

In the combined sealing valve seat, the inner valve seat is directly connected with the outer valve seat through threads or is connected with the outer valve seat through screws.

The utility model discloses following beneficial effect has:

the utility model discloses the combination seal disk seat, first one main seal is metal to metal hard seal (referring to the sealed between disk seat and the spheroid), realize water pressure seal zero leakage, the secondary seal is the soft seal (referring to the sealed between sealing washer and the spheroid) for the second, as the high-pressure gas seal secondary seal, can effectual compensation spheroid be out of shape, realize high-pressure gas seal zero leakage, the third is supplementary sealed (the sealed clamping ring that indicates and the sealed between the spheroid), can effectively clear away the foreign matter attached to the spheroid surface when the switch, guarantee valve normal switch. The novel combined seal can realize one-time assembly of high-pressure air seal and zero leakage, effectively avoids repeated disassembly and assembly of the valve and repair grinding, and solves the problem of leakage of the high-pressure air seal of the valve on site.

Drawings

FIG. 1 is a schematic view of the combined sealing valve seat of the present invention;

fig. 2 is a schematic view of the combined sealing valve seat of the present invention when the valve is closed by 1/4.

The respective symbols in the figure are as follows:

1-sphere, 2-valve cover, 3-support plate, 4-check ring, 5-inner valve seat, 6-outer valve seat, 7-sealing press ring, 8-sealing ring, 9-O-shaped ring, 10-fireproof graphite ring, 11-spring, 12-positioning pin.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.

As shown in fig. 1, it is the schematic diagram of the combined sealing valve seat of the present invention, which includes an inner valve seat 5, an outer valve seat 6, a retainer ring 4, a seal ring 8, a sealing press ring 7, an O-ring 9, a fireproof graphite ring 10, and other parts. The inner valve seat 5 is arranged in a special triangular groove, the sealing ring 8 is embedded in the triangular groove, the sealing press ring 7 is installed, the sealing press ring 7 is pressed through the threads of the outer valve seat 6 and the inner valve seat 5, and the sealing surface on the other side of the sealing press ring 7 is tightly attached to the ball body 1. Wherein, for metal to metal hard seal between disk seat 5 and spheroid 1, form first primary seal, realize that hydraulic seal is zero to leak. The sealing ring 8 and the ball body 1 are in soft sealing and are used as high-pressure air sealing auxiliary sealing, so that the deformation of the ball body can be effectively compensated, and zero leakage of the high-pressure air sealing is realized; the sealing between the sealing press ring 7 and the ball body 1 is auxiliary sealing, so that foreign matters attached to the surface of the ball body can be effectively removed during opening and closing, and normal opening and closing of the valve are guaranteed.

In fig. 1, the ball 1 is assembled in the shaft holes of the upper and lower 2 support plates 3 through the upper and lower shafts, the support plate 3 and the valve cover 2 are assembled and positioned through the positioning pin 12, and the valve body and the valve cover 2 are assembled through the bolt connection to fix the support plate 3, so that the fixing of the ball 1 is realized. The whole valve seat is preloaded by the spring 11 to ensure low-pressure sealing, the pretightening force of the spring 11 is transmitted to the valve seat assembly by the retainer ring 4, and when the cavity pressure pushes the O-shaped ring 9 to the valve cover 3, the retainer ring 4 provides support and blocking. The fireproof graphite ring 10 reduces internal leakage when the soft seal fails in case of fire.

In the utility model, the sealing ring 8 can be an O-shaped sealing ring or a triangular sealing ring; the sealing press ring 7 can be a metal sealing press ring; the connection of the inner and

outer valve seats

5, 6 can be a direct threaded connection or a connection by means of screws.

As shown in FIG. 2, the combined sealing valve seat of the present invention is shown in a schematic view of 1/4 of the valve closed.

In the existing hard seal ball valve, pure metal is sealed to metal; the utility model discloses the disk seat passes through modular seal structure to the metal is sealed firmly and is given first place to, realizes that water pressure seal is zero, and the secondary seal is the soft seal way, and as the high-pressure gas seal secondary seal, can effectual compensation spheroid warp, realizes high-pressure gas seal zero leakage, and the secondary seal is said to the third, can effectively clear away the foreign matter attached to the spheroid surface when the switch, and novel structure effectively solves the hard sealed ball valve high-pressure gas of normal atmospheric temperature heavy-calibre and seals a difficult problem.

Claims

1. A combined sealing valve seat comprises an inner valve seat and an outer valve seat which are in sealing fit; the method is characterized in that:

and a sealing press ring and a sealing ring are arranged between the inner valve seat and the outer valve seat, and the other side surface of the sealing press ring is attached to the sphere.

2. The composite sealing valve seat according to claim 1, wherein: the inner valve seat is provided with a groove, and the sealing ring is arranged in the groove.

3. The composite sealing valve seat according to claim 2, wherein: the groove is a triangular groove.

4. The composite sealing valve seat according to any one of claims 1-3, wherein: the sealing ring is an O-shaped sealing ring or a triangular sealing ring.

5. The composite sealing valve seat according to any one of claims 1-3, wherein: the sealing press ring is a metal sealing press ring.

6. The composite sealing valve seat according to any one of claims 1-3, wherein: the inner valve seat is directly connected with the outer valve seat through threads or connected with the outer valve seat through screws.