RU2544677C1 - Wedge gate valve - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: wedge gate valve contains body, gate in form of hard wedge in contact by its side surfaces with seats, O-rings. The side surfaces of the hard wedge are made spherical, on them O-rings are free installed, they are in contact with the internal cone plane with spherical surfaces of the wedge, and with outside surface in contact with seats. O-ring internal plane is at angle λ to the outside O-ring plane. The gate has pressing elements secured in groove made on the spherical side surfaces of the wedge.

EFFECT: increased tightness of the valve gate, reduced possibility of scores on the sealing surfaces of the gate under high pressure drop of the medium, and exclusion of the possibility of the gate jamming in the body slot by means of self-adjustment of the O-rings without breaching of the contact between the sealing surfaces of seats and O-rings.

3 cl, 2 dwg

Description

The proposed technical solution relates to the field of pipe fittings that control the flow of liquid or gaseous medium in the pipeline, and can be used in main oil pipelines, gas pipelines, enterprises of the energy complex, oil refining and chemical industries for high temperatures and pressures.

A large number of valve designs are used in the technique, including wedge gate valves, which are widespread.

Gate valves are known in which the shutter is sealed by self-adjusting seats or a self-adjusting wedge.

Known valves with a wedge gate made in the form of a solid rigid wedge or formed by two disks located at an angle. (See, for example, DF Gurevich "Calculation and design of pipe fittings", "Engineering", Moscow, 1964, p.119-124).

The use of a one-piece wedge creates a rigid and reliable design, but when the temperature fluctuates, it is possible to jam the wedge. With a double-disc shutter, the possibility of jamming is much less, but when used for large flow areas and high pressures, the disk is deformed, which leads to a loss of tightness and increased wear, seizure of sealing surfaces.

Known designs of wedge gate valves in which the lateral surface of a rigid wedge is made with an elastic element. (See, for example, patent RU No. 2147703 dated 05/26/1998 according to CL F16K 3/12).

This embodiment of the wedge gate valve provides high tightness, reliability and reduced wear of the sealing surface. However, the use of elastic elements of small thickness at high sealing forces or pressures can lead to their destruction.

Closest to the proposed technical solution is a wedge gate valve comprising a housing, a rigid wedge and o-rings installed in the grooves of the wedge. (See patent RU No. 2140033 from 05.25.1998 according to CL F16K 3/12).

A disadvantage of the known gate valve is the rigid fastening of the sealing ring to the wedge, which can lead to jamming of the valve in the housing socket, to reduce the maintainability of the valve and the manufacturability of manufacture.

The technical task is to eliminate the possibility of jamming of the shutter in the housing socket by self-installing the sealing rings without breaking the contact between the sealing surfaces of the seats and rings and redistributing the load.

The solution of this problem allows to increase the reliability of the valve, while increasing the service life and sealing ability by eliminating the possibility of seizure of sealing surfaces when opening the shutter under a high differential pressure of the medium in the valves of large passage sections.

The technical result is achieved due to the fact that in the wedge gate valve containing the housing, the shutter is in the form of a hard wedge in contact with the side surfaces with seats, the sealing rings, the side surfaces of the hard wedge are made spherical on which the sealing rings that are in contact with the inner conical plane with the spherical surfaces of the wedge, and the outer plane with the seat, and the inner plane of the ring is located at an angle λ to the outer plane of the ring, in addition, ene pressing member which is secured in the groove formed on the side surfaces of the spherical wedge.

In addition, the clamping element is fixed in the grooves of the spherical elements with bolts and is made stepwise.

The implementation of the valve in the proposed manner allows the sealing ring to move freely along the spherical surface of the wedge and to self-install without breaking contact between the sealing ring and the sealing surface of the seat, which ensures the sealing ability of the valve.

In this case, the load is redistributed over the surfaces, which ensures that the wedge is torn off the seat at high pressures and temperatures without scoring on the sealing surfaces. The essence of the technical solution is illustrated by drawings.

In FIG. 1 shows a general view of a valve.

Figure 2 shows the node And figure 1.

The wedge gate valve consists of a housing 1, in which the saddles 2, the valve 3 are located, made in the form of a rigid wedge 4, mounted on the stem 5. The lateral surfaces of the wedge 4 are made spherical. O-rings 6 are installed on the lateral spherical surface, the inner plane 7 of which is conical and located in relation to the outer plane 8 at an angle λ, where the angle λ is the angle of the conical surface. Changing the angle λ affects the balancing of the moments M ₁ and M ₂ from the resultant contact forces on the sealing surfaces, and this leads to maintaining the stability of the shape of the sealing ring, which ensures sealing without breaking the contact between the sealing surfaces of the rings and seats.

The valve is equipped with a clamping element 9 having the form of a stepped flange. A groove 10 is made on the lateral spherical surface of the wedge 4, in which a clamping element 9 is fixed, interacting with the recess 11 of the ring 6. The clamping element 9 is fixed using bolts 12 or in any other way of fixing.

The operation of the valve is as follows.

When closing the valve, the stem 5 of the valve 3 is lowered into the housing 1. The rigid wedge 4 through the o-rings 6 comes into contact with the seats 2, reliably locking the valve for the passage of the medium. The sealing between the seats 2 and the valve 3, as well as between the sealing rings 6 and the lateral spherical surface of the hard wedge 4 occurs as a result of elastic deformation of the sealing rings 6. In addition, there is a self-sealing effect due to the mobility of the sealing rings 6 relative to the spherical surface of the hard wedge 4 along the conical the inner surface 7 of the latter within the gaps provided by the stepped shape of the clamping element 9.

When the valve opens, the process occurs in the reverse order. Due to the mobility of the sealing rings 6 relative to the spherical surface of the hard wedge 4, the load is redistributed and the bolt 3 is separated from the seats 2 without scoring on the sealing surfaces.

Using the proposed design allows you to increase the number of actuations, while ensuring the tightness of the shutter in the valves of large flow cross sections with high environmental parameters. Therefore, the reliability of the valve increases, the service life and its sealing ability increase.

Claims (3)

1. A wedge gate valve, comprising a housing, a shutter in the form of a hard wedge in contact with the side surfaces with seats, O-rings, characterized in that the side surfaces of the hard wedge are made spherical, on which the O-rings are movably fixed, contacting the inner conical plane with the spherical surfaces of the wedge, and the outer plane with saddles, and the inner plane of the ring is located at an angle λ to the outer plane of the ring, in addition, the valve is equipped with clamping elements, cat The others are fixed in grooves made on the spherical lateral surfaces of the wedge. 2. A wedge gate valve according to claim 1, characterized in that the clamping element is bolted to the grooves of the spherical elements. 3. A wedge gate valve according to claim 1, characterized in that the clamping element is stepped.

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