RU2264573C2 - Valve with wedge-shaped gate - Google Patents

Abstract

FIELD: valving.

SUBSTANCE: valve comprises gate made of two members. The first member is made of a wedge with spherical socket and cooperates with the head of the spindle. The second member is made of a spherical insert whose radius is less than that of the sphere that is in a contact with it and is mounted in the socket of the wedge. The arrester of the mutual movement of the gate members is made of two axles. The axles are axially aligned. One end of each of the axles is secured in the opening of the wedge. The other end is radially and axially spaced in the opening of the insert.

EFFECT: enhanced reliability.

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Description

The invention relates to valves and can be used as a locking device on technological lines in the oil and gas industry, energy, and also in other industries.

Known wedge gate valves, consisting of a wedge gate and a liner with a through hole for the passage of the limiter of their relative movement relative to each other (SU 181928 A1, IPC G 01 N 21/78, 01/01/1966).

However, the placement of the stopper of the mutual movement of the shutter parts, made in the form of a bolt and located along the axis of the passage in the fluid flow with the valve fully closed, reduces the reliability and durability of the valve. If the flow of fluid is directed from the side of the valve gate valve insert, then in the closed position the valve operates reliably. If the fluid flow is directed from the side of the wedge, then in the closed position the valve’s performance is extremely unreliable due to the need to ensure tightness in pairs: the body seat is the shutter liner, the liner hole is the bolt, the liner is the shutter wedge, since it is possible to achieve a two-way seal of the shutter in the closed valve very difficult. Therefore, the durability of this shutter is half as much, since when the sealing surface of the shutter wedge is worn, it makes no sense to deploy the valve on the pipeline 180 degrees.

The closest technical solution, selected as a prototype, is a valve with a wedge valve, comprising a housing, a valve with spherical, mutually contacting parts, interacting with the spindle head, and a limiter for mutual movement of the valve parts located in a plane perpendicular to the axis of passage of the valve (SU 1681098 A1, IPC F 16 K 3/12, 09/30/1991). A disadvantage of the known wedge shutter is that the limiter for the mutual movement of the parts of the shutter is made on the spindle head. This leads, firstly, to uneven loading along the spindle when closing the valve, as a result of which the spindle may become unstable, bend and, as a result, become jammed in the threaded sleeve due to the bending moment from the force on the shoulder and the spike of the spindle head; secondly, to the gap between the spike and half-cylindrical bores in the bolt, which is increased compared with that required for the self-installation of the valve parts relative to the seats to compensate for errors in the manufacture of valve parts due to misalignment of the spindle relative to the working surfaces of the seats, as a result of which premature scoring may occur on the working sealing surfaces gate valves and, as a result, loss of valve tightness; thirdly, to the uneven load on the protrusions due to their execution on both parts of the wedge shutter from the spindle shoulders when opening the valve, which can lead to damage to the protrusions or shoulders. Therefore, the known wedge gate valve design is unreliable.

The aim of the invention is to increase reliability. This goal is achieved by the fact that the valve with a wedge valve, comprising a housing, a valve with spherical, mutually contacting parts, interacting with the spindle head, and a limiter for mutual movement of the valve parts located in a plane perpendicular to the axis of the valve passage, contains a valve, one of the parts of which made in the form of a wedge with a spherical socket and interacts with the spindle head, and the second part in the form of a spherical insert with a radius of the sphere smaller than the radius of the sphere in contact with it is placed wedge in the socket, the stopper mutual moving parts of the shutter is made in two axes, disposed coaxially with each other, wherein one end of each of the axes fixed in the hole of the wedge, and the other is located in the bore of the insert with radial and axial gaps.

Due to the coaxial arrangement of the limiters of the relative movement of the shutter parts relative to each other, giving them a cylindrical shape in the form of axes with a spherical insert in the holes with minimal radial and structurally necessary axial clearances and cantilever fastening with the possibility of their elastic deformation, excessive contact between the wedge and the spherical insert with the working surfaces of the seats when closing-opening the valve and the appearance of premature scoring on its sealing surfaces, which increases V is the reliability of the gate and gate as a whole. The implementation of the protrusions interacting with the shoulders of the spindle when opening the valve, only on one part of the wedge shutter - the wedge eliminates the uneven load on the protrusions of the wedge shutter from the spindle shoulders and allows you to equip the spindle head with a spherical tip to align the load along its axis when closing the valve, which increases reliability valve operation.

Since the radius of the spherical liner is less than the radius of the wedge socket within one to two millimeters, at the initial moment of contact of the wedge gate with the valve seats when it is closed, the spherical liner swings and turns relative to the point of contact with the wedge socket, and the flat form of the liner on the side of the saddle ensures its equal strength from the valve closing force and uniform load distribution over the contact area with the seat, increasing the reliability of the valve seal.

Figure 1 shows a valve, a longitudinal section; figure 2 is a section aa in figure 1; figure 3 is a section bB in figure 1.

The valve contains a wedge gate, one of the parts of which is made in the form of a wedge 1 with a spherical socket - radius "a" and interacts with the head of the spindle 2, and the other part in the form of a spherical insert 3 - with a radius of the sphere "b", smaller than the radius "a" placed in the slot of the wedge 1, while the limiter of mutual movement of the spherical liner 3 relative to the wedge 1 is made in the form of two axes 4, coaxially located between each other, one end of each of the axles 4 is fixed in the hole of the wedge 1, and the other is located in the hole of the liner 3 with radial gap "a" and axial "g". When the valve is closed, the wedge 1 and the spherical insert 3 are pressed against the saddles 5 of the valve body 6.

The valve operates as follows. By moving the wedge gate with the spindle 2 along its axis of symmetry in one direction or another, the valve opens or closes. When the wedge shutter moves under the action of the spherical tip “d” of the spindle head 2 down, the wedge 1 and the spherical insert 3 interact with the saddles 5 of the valve body 6, rotate relative to each other along mutually contacting spherical surfaces and are tightly pressed against the saddles 5, the valve closes. When the wedge shutter moves under the action of the shoulders "e" of the spindle 2 on the protrusions "g" of the wedge 1 upwards, the wedge 1 and the spherical insert 3 depart from the seats 5, the valve opens. With the valve fully open, the spherical insert 3 is held in the spherical nest of the wedge 1 from falling out with the help of coaxially located axes 4.

Such a technical solution as the implementation of one of the parts of the wedge-shaped shutter in the form of a wedge with a spherical socket interacting with the spherical tip of the spindle head and the placement of a spherical insert in the wedge’s socket eliminates the uneven load on the protrusions of the wedge-shaped shutter and the shoulders of the spindle, equalize the load along the axis of the spindle . And the coaxial arrangement of the limiters of the mutual movement of the shutter parts relative to each other, giving them a cylindrical shape in the form of axes with a spherical insert in the holes with minimal radial and structurally necessary axial clearances and cantilever fastening with the possibility of their elastic deformation, eliminate excessive contact between the wedge and the spherical insert with the workers the surfaces of the seats when closing-opening the valve and the appearance of premature scoring on its sealing surfaces, which increases the reliability st and work wedge gate valve in general.

Claims (1)

A wedge gate valve comprising a housing, a valve with spherical mutually contacting parts interacting with the spindle head, and a stopper for mutual movement of the valve parts located in a plane perpendicular to the valve passage axis, characterized in that one of the valve parts is made in the form of a wedge with a spherical the nest and interacts with the spindle head, and the second part, in the form of a spherical insert with a radius of a sphere smaller than the radius of the sphere in contact with it, is placed in the nest of the wedge, while the reciprocal reciprocal of the parts of the shutter is made in the form of two axes coaxially located between each other, with one end of each of the axes fixed in the hole of the wedge, and the other located in the hole of the insert with radial and axial clearances.

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