RU2286499C2 - Gate valve - Google Patents

Abstract

FIELD: valving.

SUBSTANCE: gate valve comprises housing composed of two interconnected housing members and ring interposed between the housing members. The space of the ring receives the slide valve and gearing rim that can rotate and cooperate with the driving shaft. The gearing rim is mounted in the space formed by the slide valve, intermediate ring, and housing members. The slide valve has step for permitting interaction with the gearing rim.

EFFECT: reduced metal consumption and enhanced reliability.

Description

The invention relates to the field of petroleum and chemical engineering and can be used as a locking device on pipelines transporting oil or industrial water, as well as for blocking the channels of wellhead fittings for fountain, pump and injection wells in industrial oil production.

Known valve according to USSR author's certificate No. 1390468, made in the form of a rotary shutter, containing a housing in which it is movable, with the formation of a regulation zone, a disk locking element in the form of a gate with a passage channel in which the housing consists of two parts interconnected by bolts , and having sealing elements to prevent leakage of the working environment. The disadvantage of this valve is the design complexity and its low manufacturability.

A known valve according to the utility model RU 12713, comprising a housing made of two parts, between which a spacer ring is rigidly fixed, in the internal cavity of which, with the possibility of rotation in its plane within the control zone, is placed a disk gate with a passage channel and a cavity with a toothed radius sector . The disadvantage of such a valve is low manufacturability, quick wear, and the complexity of the repair.

Known gate valve according to patent RU 2229051, selected as a prototype, comprising a housing made of two parts, between which a spacer ring is rigidly fixed, in the inner cavity of which a disk gate with a passage channel is placed in its plane, a gate rotation mechanism consisting of the gear sector made in it and the drive gear interacting with it, the disk gate is centered on the inner diameter of the spacer ring, thrust bearings in the form of contour sealing elements getting on the end surfaces of the gate. The disadvantage of the valve is the complexity of manufacturing and repair, the rapid wear of the gear sector.

The technical problem to be solved by the claimed invention is directed is to increase the manufacturability of manufacture and repair, to increase its durability.

The specified technical result is achieved due to the fact that in the valve containing the body, consisting of two interconnected half-bodies, between which an intermediate ring is fixed, in the cavity of which a gate is rotatably placed in its plane, the ring gear is installed in the cavity formed by the gate, an intermediate ring and half-bodies with the possibility of rotation and interacting with the drive shaft, and in the gate a ledge is made with the possibility of interaction with the ring gear. The drive shaft is connected to the gate position indicator. The gate position indicator is made in the form of a screw-nut pair, the screw is mounted on the drive shaft, and the nut is kept from turning by the body of the gate position indicator and installed with the possibility of translational motion. The gate position indicator housing provides visual control of the position of the nut and can be made transparent and tight.

The valve is shown in the drawings:

figure 1 - valve assembly;

figure 2 - disk gate;

figure 3 is a pointer to the position of the gate.

The gear ring 5 is placed in the cavity formed by the gate 4, the intermediate ring 3 and the half-shells 1 and 2 (figure 2, 3) with a gap that allows replacement during assembly.

The gate position indicator is made in the form of a screw-nut pair (Fig. 4), the screw 7 is mounted on the drive shaft 6, and the nut 8 is protected against rotation by the transparent case 9 of the gate position indicator, providing visual control of the position of the nut 8, and having the inscription "open" and "closed", which allows the site to control the position of the gate tight. The progressive movement of the nut 8 along the screw 7 prevents dirt from entering the assembly - the drive shaft - the gate, which improves the reliability of the valve.

The valve operates as follows.

Gate 4 is in the "open" position. When the drive shaft 6 is rotated using the key 10, the ring gear 5 is set in motion and moves in the cavity formed by the gate 4, the intermediate ring 3 and the half-bodies 1 and 2 within the gap, then the ring gear 5 interacts with the step in the gate 4. Further movement the ring gear 5 occurs together with the gate 4 around the axis 11 from the "open" to the "closed" position. The angle of rotation of the drive shaft 6 depends on the geometrical dimensions of the main parts of the valve — the disk gate 4 and the parameters of the ring gear 5. In the pilot samples of valves with a nominal diameter of the valve of 65 mm, when the drive shaft 6 is turned 878 degrees, the valve 4 rotates around the axis 116 degrees fully opening or closing the bore of the valve. At the same time, the gate position indicator nut 8, interacting with the screw 7, mounted on the drive shaft 6 and protected against rotation by the gate position indicator case 9 during rotation of the drive shaft 6, moves inside the gate position indicator case 9, providing visual control of the gate position 4. Extreme the positions of the nut 8 correspond to the positions of the gate “open” and “closed”. The corresponding inscriptions and arrows of the direction of rotation of the drive shaft are printed on the transparent case 9 of the gate position indicator.

The implementation of the ring gear in the form of a separate part, not related to the gate and resting on the inner surface of the ring, made it possible to increase the manufacturability of both the gate and the ring gear, simplified the repair, because it is the ring gear that is subject to wear. At the same time, the gear ring was able to self-align relative to the counter gear on the drive shaft, which reduced the wear of the gear transmission.

High maintainability, reliability and ease of control of the valve described above are confirmed by its tests in real production conditions in the oil industry. The total average resource was 1800 cycles, which ensures its full service life of at least 9 years. Practice has confirmed that the average valve service life before major repairs is at least 5 years.

Claims (6)

1. A valve comprising a housing consisting of two interconnected half-bodies, between which an intermediate ring is fixed, in the cavity of which a gate is mounted rotatably in its plane, a gear ring mounted for rotation and interacting with the drive shaft, characterized in that the ring gear is installed in the cavity formed by the gate, the intermediate ring and the half-shells, and a ledge is made in the gate with the possibility of interaction with the ring gear. 2. The valve according to claim 1, characterized in that the drive shaft is connected to the position indicator of the gate. 3. The valve according to claim 2, characterized in that the gate position indicator is made in the form of a screw-nut pair, the screw is mounted on the drive shaft, and the nut is kept from turning by the gate position indicator housing and is installed with the possibility of translational movement. 4. The valve according to claim 3, characterized in that the housing of the gate position indicator provides visual control of the position of the nut. 5. The valve according to claim 3, characterized in that the housing of the gate position indicator is made transparent. 6. The valve according to claim 3, characterized in that the housing of the position indicator is sealed.

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