CN102518828A - A high temperature and high pressure floating ball hard seal slag lock ball valve - Google Patents

Abstract

The invention discloses a high-temperature high-pressure floating ball hard sealing slag locking ball valve, which comprises a valve body, a valve seat and a ball body in sealing contact with the valve seat, and is characterized in that: and a sealing ring for preventing sealing media from leaking from the valve seat to the valve body is arranged between the valve body and the valve seat, an extruding device for extruding the sealing ring is arranged on the valve body, and a valve body boss which can be in sealing contact with the valve seat is arranged on the valve body. The double-sealing valve comprises a valve body, a valve seat and a ball body in sealing contact with the valve seat, wherein a sealing ring for preventing sealing media from leaking from the space between the valve seat and the valve body is arranged between the valve body and the valve seat, and a valve body boss capable of being in sealing contact with the valve seat is arranged on the valve body.

Description

A high temperature and high pressure floating ball hard seal slag lock ball valve

technical field

The invention relates to a valve, in particular to a high temperature and high pressure floating ball hard seal slag lock ball valve.

Background technique

The ball valve is mainly used to control the on-off of the fluid in the pipeline. At present, the seat structure of the high-temperature and high-pressure hard-sealed ball valve is divided into two types: one is to embed the valve seat in the seat hole of the valve body, and use the interference fit between the seat and the valve body The seal between the valve seat and the valve body is achieved to prevent the medium from leaking from the gap between the valve body and the valve seat. The disadvantage of this structure is: the interference fit between the metals makes the valve seat firmly embedded in the valve seat hole of the valve body. Under high temperature conditions, due to the different thermal expansion of materials and the dimensional error of parts processing and assembly, there is a gap between the valve seat and the valve body, and the medium leaks from the valve seat and the valve body, which causes the back side of the valve seat to be eroded, resulting in valve failure. The seat is scrapped ahead of time, especially in the mixed medium with fine solid particles and gas; the other is to set a special metal sealing device between the valve seat and the valve body. The structural disadvantage of this valve seat is: not only the structure is complicated, Moreover, the use of special materials and special welding, processing and heat treatment processes makes it difficult to manufacture and high in cost.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a high-temperature and high-pressure floating ball hard-sealed slag-locking ball valve with double sealing effect and reliable sealing under high temperature and high pressure.

The technical solution adopted by the present invention to solve its technical problems is:

A high-temperature and high-pressure floating ball hard-sealed slag-locking ball valve includes a valve body, a valve seat, and a ball in sealing contact with the valve seat. The sealing ring leaking between, and the valve body is provided with an extruding device for squeezing the sealing ring, and the valve body is provided with a valve body boss capable of sealing contact with the valve seat.

The extruding device includes a pressure ring arranged on the valve body and a connecting fastener for locking the pressure ring, and the pressure ring presses against the valve seat.

A gasket capable of sealing contact with the sealing ring and the valve body is provided between the sealing ring and the valve body.

The sealing ring adopts graphite sealing ring.

The beneficial effect of the present invention is: comprising valve body, valve seat and the sphere that is in sealing contact with valve seat, the sealing ring that prevents sealing medium from leaking from valve seat and valve body is provided between valve body and valve seat, and valve body is provided with There is a valve body boss that can be in sealing contact with the valve seat, so that the present invention can double seal the valve body and the valve seat through the sealing ring and the valve body boss, which ensures the reliability of the present invention's sealing under high temperature and high pressure, and prevents medium Leakage between the valve seat and the valve body.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is further described:

Fig. 1 is a schematic cross-sectional view of the present invention.

Detailed ways

Referring to Fig. 1, the present invention discloses a high-temperature and high-pressure floating ball hard-sealed slag lock ball valve, which includes a valve body 1, a valve seat 2 and a ball 3 in sealing contact with the valve seat 2; Sealing medium leaks from the sealing ring 4 between the valve seat 2 and the valve body 1, and the valve body 1 is provided with an extrusion device that squeezes the sealing ring 4, and the valve body 1 is provided with a valve that can be in sealing contact with the valve seat 2 Body boss 5.

As shown in the figure, the extruding device includes a pressure ring 6 arranged on the valve body 1 and a connecting fastener 7 for locking the pressure ring 6 , and the pressure ring 6 presses against the valve seat 2 . In this specific embodiment, bolts are used for the connecting fastener 7; further, in order to improve the sealing performance, a gasket 8 that can be in sealing contact with the sealing ring 4 and the valve body 1 is provided between the sealing ring 4 and the valve body 1, and the sealing Ring 4 has adopted high temperature resistant graphite sealing ring 4.

The working principle of the present invention is as follows: under the action of medium force and mechanical force, the floating ball 3 of the present invention pushes the ball 3 to press the valve seat 2 to form a seal between the ball 3 and the valve seat 2, thereby cutting off the medium and achieving the closing effect. The seal between the valve seat 2 and the valve body 1 is pressed by bolts on the pressure ring 6, the pressure ring 6 is pressed on the valve seat 2, the valve seat 2 is pressed on the flexible graphite sealing ring 4, the flexible graphite sealing ring 4 is pressed on the backing ring, the backing ring Press the valve body 1 to form a seal between the flexible graphite sealing ring 4 and the valve body 1 and the valve seat 2; It is sealed with the valve body 1 by pre-tightening stress, so that the valve body 1 and the valve seat 2 are double-sealed through the sealing ring 4 and the valve body boss 5, which ensures the reliability of the present invention's sealing under high temperature and high pressure, and prevents the medium from leaking from the valve seat. Leakage between 2 and valve body 1.

The above are only illustrations and descriptions of some preferred embodiments of the present invention, but the implementation of the present invention is not limited by the above embodiments, as long as they achieve the technical effects of the present invention by basically the same means, they all belong to the present invention scope of protection.

Claims (4)

1. A high temperature and high pressure floating ball hard seal slag lock ball valve, comprising a valve body, a valve seat and a sphere in sealing contact with the valve seat, is characterized in that: between the valve body and the valve seat, a sealing medium is provided to prevent the The sealing ring leaking between the valve bodies, and the valve body is provided with an extruding device for squeezing the sealing ring, and the valve body is provided with a valve body boss capable of sealing contact with the valve seat. 2. A high-temperature, high-pressure floating ball hard-sealed slag-locking ball valve according to claim 1, characterized in that: the extrusion device includes a pressure ring arranged on the valve body and a connecting fastener for locking the pressure ring , and the pressure ring is pressed against the valve seat. 3. A high-temperature, high-pressure floating ball hard-sealed slag-locking ball valve according to claim 1 or 2, characterized in that a gasket capable of sealing contact with the sealing ring and the valve body is provided between the sealing ring and the valve body. 4. A high-temperature, high-pressure floating ball hard-sealed slag-locking ball valve according to claim 1, characterized in that: the sealing ring is a graphite sealing ring.

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