RU2351830C2 - Stop valve - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: present invention pertains to mining, particularly to oil and gas production and is meant for use in oil and gas well head equipment, oil pipelines, water pipelines and gas pipelines. The stop valve has housing with coaxially arranged connection pipes, a bypass bushing and an eccentric gear. In the housing there is a recess and a ring with a compactible conical surface, a stopper with the corresponding packing conical surface, liquid flow channels and a circular groove under the eccentric gear. The gear is fitted through a chamber and a radial hole made on the housing. The bypass bushing with inlet and outlet channels for flow of liquid through the cavity between the housing and the outer surface of the bushing is fitted into the recess through the stopper and is fixed using a nut. At the butt end of the bushing there is an open slot for aligning, through a wear bushing, the eccentric gear with the side hole in the bushing. On the inner diameter of the bypass bushing there is a projecting edge with a bearing surface in contact with the corresponding bearing surface of the stopper. Inlet and outlet channels are made at an angle to the axis of the housing and shifted from each other in the direction of flow of the pumped medium.

EFFECT: increased reliability, reduced cavitation wear and corrosion of structural components.

2 cl, 3 dwg

Description

The invention relates to the field of mining, in particular to the oil and gas industry, and can be used in wellhead equipment for oil and gas wells, in the operation of oil pipelines, water pipelines, gas pipelines.

Known locking devices [RU No. 94041194 A1, cl. F16K 3/24, 09/20/1996, RU No. 2168091 C2, 7 F16K 5/04, 05/27/2001], containing housings, locking elements, actuator, flange connection elements.

The disadvantages of the known locking devices are: design complexity due to the large elemental base, complexity in the manufacturing process and, as a rule, unreliability during operation.

A locking device is known [RU No. 2261389 C2, F16K 3/26, 01/10/2005] (prototype), comprising a housing made in the form of two coaxially connected pipes with radial holes connected through annular grooves with a bypass sleeve, a crosshead with eccentric center hole with control lever.

The disadvantages of the above equipment are: cavitation wear and corrosion of structural elements, which determine the reliability of the shut-off device during operation, the complexity of the design due to the large elemental base, low technology and, as a rule, unreliability during operation.

The objective of the invention is to increase reliability, in the exclusion of cavitation wear and corrosion of structural elements that determine the reliability of the shut-off device during operation, to ensure maintainability and competitiveness.

The technical result is achieved in that in the locking device comprising a housing made with coaxially arranged nozzles, a bypass sleeve and an eccentric drive, characterized in that the housing is made a groove and a ring with a sealed conical surface, a tube with a corresponding sealing conical surface, channels for fluid flow and an annular groove for an eccentric drive installed through the chamber and radial hole made in the housing, the bypass sleeve with input and the passageways for the fluid flow through the cavity between the housing and the outer surface of the sleeve are mounted in a recess through the plug and fixed with a nut, and at the end of the bypass sleeve an open groove is made to align the eccentric drive through the protective sleeve with a side hole in the sleeve, and on the inner diameter of the bypass sleeve shoulder with a supporting surface for interaction with the corresponding supporting surface of the tube, while the input and output channels are made at an angle to the axis of the locking device and offset from each other in the pumped fluid flow direction.

To exclude cavitation wear and corrosion of structural elements that determine the reliability of the shut-off device during operation, the ring with a sealed conical surface, a plug with a sealing conical surface, a bypass sleeve, a fixing nut and a protective sleeve are made of polymer material.

Figure 1 shows the locking device in the "open" position.

Figure 2 shows the locking device in the closed position.

Figure 3 is a section aa in figure 2.

The locking device contains:

coaxial nozzles of the housing 1,

a recess 2 made in the housing 1,

bypass sleeve 3,

output channels 4, made at an angle α in the bypass sleeve 3 and offset in the direction of flow of the pumped medium relative to each other by Δ,

outer surface 5 of the bypass sleeve 3,

cavity 6 between the housing 1 and the outer surface 5 of the bypass sleeve 3,

the input channels 7, made at an angle α in the bypass sleeve 3 and offset in the direction of flow of the pumped medium relative to each other by Δ,

cork 8,

an annular groove 9 made on the surface of the cork 8, a sealing conical surface 10 made on the surface of the cork 8,

ring 11,

sealing conical surface 12 made in the ring 11,

an open groove 13 made at the end of the bypass sleeve 3,

lever 14,

gasket 15,

radial hole 16,

seals 17,

eccentric drive shaft 18,

protective sleeve 19,

side hole 20 for the eccentric drive 18, made in the bypass sleeve 3,

a camera 21 made in the housing 1 for mounting an eccentric drive 18 and a plug 8,

shoulder with a supporting surface 22, made in the bypass sleeve 3,

a supporting surface 23 made on the surface of the cork 8,

channels 24 for the flow of fluid, made in the tube 8,

technological hole 25,

fixing nut 26,

o-rings 27.

The assembly of the locking device is as follows.

In the recess 2, made in the housing 1, a ring 11 is inserted with a sealed conical surface 12.

Through the chamber 21 and the radial hole 16, made in the housing 1, an eccentric drive 18 with a protective sleeve 19 is installed through the gasket 15 and the seal 17.

A plug 8 with a sealing conical surface 10 through an annular groove 9 is connected to the shaft of the eccentric drive 18 through the protective sleeve 19, and in the closed position (figure 2), the lever 14 is mounted on the shaft of the eccentric drive 18.

To connect the plug 8 with the shaft of the eccentric drive 18 through the annular groove 9, if necessary, you can use the technological hole 25, which allows you to move the plug 8 in the chamber 21 through the technological axis (not shown).

The bypass sleeve 3 through the plug 8, the protective sleeve 19 passing through the open groove 13, made at the end of the bypass sleeve 3, is installed in the recess 2 made in the housing 1, and the shaft of the eccentric drive 18 is located in the side hole 20 made in the bypass sleeve 3 (figure 2, figure 3).

After installing the bypass sleeve 3, it is pressed with a fixed nut 26 in the undercut 2 of the housing 1.

The locking device through the sealing rings 27 and threaded rods with nuts is connected to the fountain fittings or to the pipeline (not shown in the drawing).

In the dynamic position, the locking device operates as follows.

In the open position (figure 1), the pumped medium (liquid, gas), circling the plug 8, through the inlet channels 7 of the bypass sleeve 3 and then through the cavity 6 located between the coaxial nozzles of the housing 1 and the outer surface 5 of the bypass sleeve 3, and also through the output channels 4 is transported according to a given technological schedule in the direction indicated by arrows.

In addition to the foregoing, the pumped medium passes through channels 24 for the flow of fluid, made in the tube 8.

That is, the process flow of the pumped medium during the passage through the device shut-off is divided into two streams: the first stream through the cavity 6; the second stream through channels 24 made in the plug 8, and when the shut-off device exits the device, the flows of the pumped medium are connected.

This property of the shut-off device allows for shock-free operation at high pressure [MPa (kgf / cm ² ) ≥35 / 350] and its ease of control.

The implementation of the input and output channels 4 and 7 at an angle α and their offset by Δ relative to each other in the direction of the flow of the pumped medium reduce the hydraulic resistance when pumping the pumped medium, and also provide ease of operation of the shut-off device during operation.

To exclude cavitation wear and corrosion of structural elements that determine the reliability of the locking device during operation, the ring 11 with a sealed conical surface 12, a plug 8 with a sealing conical surface 10, a bypass sleeve 3, a fixing nut 26, and a protective sleeve 19 are made of polymer material.

The interaction of the shoulder 22, made in the bypass sleeve 3, with the supporting surface 23 on the surface of the plug 8 with the simultaneous interaction of the protective sleeve 19 of the shaft of the eccentric drive 18 through the annular groove 9 on the plug eliminates the forcing of the plug 8 in the direction of flow of the pumped medium at high pressure [MPa (kgf / cm ² ) ≥35 / 350].

To shut off the locking device, for example, on wellhead equipment or on an oil and gas pipeline, the shaft of the eccentric drive 18 is rotated by the lever 14.

When rotating, the shaft of the eccentric drive 18, interacting through the annular groove 9, moves the plug 8, and the sealing conical surface 10 interacts with the corresponding sealing conical surface 12 made in the ring 11, blocking the pumped liquid or gas flow passing through the shut-off device.

The locking device is closed (figure 2).

Both in the closed and in the open position (Fig. 1, Fig. 2), the shut-off device is sealed at pressures [MPa (kgf / cm ² ) ≥35 / 350] and pumped media, including aggressive ones, are excluded from environment.

The proposed new technical solution of the locking device differs from the known technical solutions by novelty, technologically advanced in manufacturing, reliable in operation, maintainable, competitive, and its use in production will provide a positive technical and economic effect.

Claims (2)

1. The locking device, comprising a housing made with coaxially arranged nozzles, a bypass sleeve and an eccentric drive, characterized in that the housing is made a recess and a ring with a sealed conical surface, a plug with a corresponding sealing conical surface, channels for fluid flow and an annular groove are installed for an eccentric drive installed through the camera and a radial hole made in the housing, a bypass sleeve with inlet and outlet channels for fluid flow through the cavity between the housing and the outer surface of the sleeve is installed in the recess through the plug and fixed with a nut, and an open groove is made at the end of the bypass sleeve to align the eccentric drive with a side hole in the sleeve through the protective sleeve, and a flange with a supporting surface for the bypass sleeve is made for interaction with the corresponding support surface of the tube, while the input and output channels are made at an angle to the axis of the locking device and are offset relative to each other in the direction lion flow of the pumped medium. 2. The locking device according to claim 1, characterized in that the ring with a sealed conical surface, a plug with a sealing conical surface, a bypass sleeve, a fixing nut and a protective sleeve are made of polymer material.

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