RU201430U1 - Shut-off valve - Google Patents

Abstract

The utility model relates to the oil and gas industry, in particular to shut-off and control equipment. The shut-off valve contains a body and working cavities connected to each other by a through hole, in each of which there is a shutter equipped with a drive fixing it in the open position with a sensitive element made in the form of a rod loaded with springs. The first shutter in the direction of movement of the transported medium is combined and is made in the form of two flaps: flaps with a through hole, in the closed position, overlapping 90% of the area of the passage opening between the working cavities, and a dead flap located with it on the same axis. The shutter, second in the direction of movement of the transported medium of the working cavity, is made in the form of a slam with a through hole, in the closed position overlapping 50% of the area of the through hole of the outlet cavity. The technical result is achieved - increasing the reliability of the shut-off valve when the high pressure pipeline is triggered and shut off, through which the medium is transported at a high speed, which provides a significant reduction in water hammer. 2 wp f-ly, 8 dwg

Description

The utility model relates to the oil and gas industry.

The functional purpose of the K302 shut-off valve (valve) is to automatically shut off the well by shutting off the high-pressure pipeline when the pressure of the working medium changes above or below the values set by the drive settings (in case of an emergency increase or decrease in pressure in the pipeline).

The valve is intended for use in pipelines of oil and gas fields and underground gas storage.

The valve is installed on the flow line of the well, at its mouth, and can also be installed on the process pipelines of oil and gas condensate fields.

The valve should be installed on a horizontal section of the pipeline with the drives upward in accordance with the arrow indicating the direction of movement of the working medium.

State of the art.

A shut-off device is known, containing a body, a rotary shut-off element located in it, made in the form of two rotary valves superimposed on one another, one of which is unloading with an opening, and the other is a blind one, covering the opening of the unloading flap, and holding the shut-off body in the open position of the main retainer. The device is equipped with an additional lock and two sensitive elements: one - low pressure, and the other high pressure, made in the form of spring-loaded rods, and the rod of the low pressure sensing element is connected to the main lock, and the rod of the high pressure sensitive element is connected to an additional lock installed with the ability to interact with the main retainer (patent RU 2103579 C1).

Known shut-off valve with two drives, with a two-stage shutdown of the flow of the medium, containing a housing, the first and second working cavities, located in them gates, gate drives, the first in the direction of movement of the transported medium, the gate is made with a through hole, and the second gate is made deaf (patent RU 180057).

This valve solves the problem of reducing water hammer.

However, in the event of an emergency shutdown of a high-pressure pipeline, through which a medium is transported at a high speed and with a high content of a liquid fraction, the capabilities of this valve to reduce water hammer may be insufficient.

A technical problem is insufficient reduction of water hammer during emergency shutdowns of high pressure pipelines.

The shut-off valve contains a housing containing two working cavities connected to each other by a through hole, in each of which there is a shutter equipped with an actuator fixing it in the open position with a sensitive element made in the form of a spring-loaded rod with protrusions at the ends. The drives are made with the possibility of adjusting the response limit of the sensitive element of the drive.

A distinctive feature of the utility model is that the valve has two working cavities and each cavity has its own shutter equipped with a drive. The second cavity in the direction of movement of the transported medium has a shutter made in the form of a slam with a through hole, which in the closed position overlaps 50% of the area of the through hole of the outlet cavity, and the first cavity has a combined shutter made in the form of a slam with a hole, which covers 90% of the area the passage opening between the working cavities and the blind flaps, located with it on the same axis, which completely blocks the passage in the inlet cavity.

In case of an emergency increase in pressure in the valve body, three stages of overlapping the flow area are carried out until it is completely closed, and the gates of both cavities are involved in this.

In case of an emergency decrease in pressure in the valve body, two stages of overlapping the flow area are carried out until it is completely closed, and the combined shutter of the first inlet cavity is involved in this.

The technical result achieved by the utility model is to increase the reliability of the slam-shut valve when the high pressure pipeline is triggered and shut off, through which the medium is transported at high speed, which provides a significant reduction in water hammer.

The essence of the claimed technical solution is illustrated by drawings Fig. 1 - Fig. 8.

FIG. 1 shows a general view of the proposed valve,

in fig. 2 shows an assembly drawing of the proposed valve in section,

in fig. 3 shows section A-A with the location of the gates of the inlet and outlet cavities, lifting units of the slam, the bypass valve and the combined gate in section,

in fig. 4 shows the initial operating position of the valve,

in fig. 5 shows the triggering of the slammer with a hole in the valve outlet cavity when the pressure in it increases,

in fig. 6 shows the operation of the slammer with a hole in the inlet cavity of the valve with a further increase in pressure in it,

in fig. 7 shows the actuation of a dull slam in the inlet cavity of the valve and complete shut-off of the medium flow,

in fig. 8 shows an actuator configured to trip on an over / under pressure alarm in the valve body.

In the figures, the positions indicate:

1 - valve,

2 - mechanical actuator, configured to operate when pressure rises in the valve body,

3 - drive handle (p.),

4 - mechanical actuator, configured to operate when pressure increases / decreases in the valve body,

5 - drive handle (turn / mon.),

6 - eye bolt,

7 - case,

8 - inlet cover,

9 - outlet cover,

10 - axis of the shutter of the outlet cavity,

11 - bracket for the shutter of the outlet cavity,

12 - shutter of the outlet cavity (flapper with a discharge opening),

13 - axis of the combined shutter of the inlet cavity,

14 - bracket of the combined shutter of the inlet cavity,

15 - combined shutter of the inlet cavity,

16 - main flap with a discharge opening,

17 - deaf clap,

18 - bypass valve,

19 - unit for lifting the shutter of the outlet cavity,

20 - handle of the unit for lifting the shutter of the outlet cavity,

21 - unit for lifting the gate of the inlet cavity,

22 - handle of the assembly for lifting the gate of the inlet cavity,

23 - scale for setting the actuation of actuator 2 in case of emergency pressure increase,

24 - scale for setting the actuation of actuator 4 in case of emergency pressure increase,

25 - scale for setting the operation of actuator 4 in case of emergency pressure drop,

26, 27 - sealing rings,

28, 29, 30 - rubber sealing rings,

31 - hairpin,

32, 33 - nuts,

34, 35 - axles,

36 - drive lever 4,

37, 38 - rubber sealing rings,

39 - hairpin,

40 - sleeve,

41 - screw

42 - nut,

43 - compression spring for setting the operation when the pressure rises,

44 - compression spring for setting operation when pressure is reduced,

45 - stock,

46 - cap,

47 - stop of the shutter of the outlet cavity,

48 - stop of the gate of the inlet cavity,

49 - drive lever 2

The device and its work

The external view of the valve without a set of mounting parts is shown in Fig. 1. The valve structure is shown in FIG. 2-8.

The valve consists of: valve 1; spring actuator (actuator 2), with automatic operation to CLOSE when valve 1 reaches the response pressure set by the actuator settings when the pressure of the working medium rises. Actuator 2 has a handle 3 designed to transfer the sensitive actuation mechanism of the actuator from the AVT position. to the position MANUAL. or STOP; spring actuator (actuator 4), with automatic operation to CLOSE when valve 1 reaches the response pressure set by the actuator settings, when the pressure of the working medium rises or falls. The drive 4 has a handle 5 designed to transfer the sensitive actuation mechanism of the drive from the AVT position. to the position MANUAL. or STOP.

Setting the actuator (Fig. 8) to operate in the event of an emergency increase in pressure in the housing is made by achieving a certain compression force of the spring 43 with the nut 42.

The actuator is set to operate in the event of an emergency decrease in pressure in the housing by reaching a certain compression force of the spring 44 by screw 41. The protection of the actuator from the external environment and violation of the setting ranges is provided by the cap 46.

For mounting and dismounting the valve on the pipeline, eye-bolts 6 are provided.

Valve 1 includes: body 7, inlet 8 and outlet 9 covers, which are attached to the body 7 with pins 31 and nuts 32.

On the axis 10 of the bracket 11 mounted on the outlet cover 9, a shutter 12 is installed.

Shutter 12 (flap 12) designed to partially block the flow of the working medium when the valve is actuated to CLOSE when the pressure of the working medium rises above the value set by the settings of the actuator 2.

On the axis 13 of the bracket 14, mounted on the body 7, a combined shutter (hereinafter referred to as the shutter 15) is installed, designed to completely block the flow of the working medium when the valve is actuated to CLOSE when the pressure of the working medium increases / decreases above (below) the values set by the drive settings 4.

The combined gate 15 consists of a main slammer 16 with a discharge opening and an additional blind slammer 17.

The design of the gates 12 and 15 is due to the need to prevent a sharp change in the pressure of the working medium at the time of the valve to CLOSE.

To equalize the pressure of the working medium before and after the combined shutter 15, a bypass valve 18 is installed in the housing 7 (Fig. 3).

To install the shutter 12 in the operating position (OPEN) on the body 7 there is a unit for lifting the flap 19 with a handle 20.

To install the combined shutter 15 in the operating position (OPEN), a lifting unit 21 with a handle 22 is installed on the body 7.

Clap lifting units are installed in the side holes of the body 7 and are fixedly fixed to the body with pins 39 and nuts 33.

The tightness of the medium flow in relation to the environment is ensured by rubber sealing rings 28-30; 37-38. The tightness of the combined shutter 15 is ensured by a seal 26 for a flapper 17 and a seal 27 for a flapper 16 with a discharge opening (Fig. 3).

Valve operation.

The principle of operation of the valve consists in sequential mechanical unlocking of gates 12 and 15 by drives 2 and 4 in case of an emergency increase in the pressure of the working medium in the pipeline and mechanically unlocking the gate 15 by drive 4 in the event of an emergency decrease in the pressure of the working medium in the pipeline.

The initial position of the valve, ready for automatic operation in the event of an emergency increase / decrease in pressure in the pipeline, is shown in Fig. 4.

Valve operation when the pressure of the working medium in the pipeline is higher than the values set by the settings of actuators 2 and 4.

The design of the drive 2 is made by analogy with the drive described in patent No. 180057. The actuator is configured to operate only in the event of an emergency increase in the pressure of the working medium in the pipeline, and the setting ensures that it is triggered first.

The design of the drive 4 (Fig. 8) is made with the possibility of triggering both in the event of an emergency increase in pressure and in an emergency decrease in the pressure of the working medium in the pipeline, and the setting of the triggering in the event of an emergency increase in the pressure of the working medium in the pipeline ensures its sequential response only after triggering of the drive 2 ...

When the pressure inside the housing 7 rises above the set value of the actuation pressure of the actuator 2 indicated on the scale 23:

The lever 49 of the drive 2 releases the slammer 12, which, under the action of its own weight and the flow of the medium, rotates on the axis 10 and is pressed against the seat of the cover 9, partially blocking the passage opening in the outlet cover 9 (the principle of interaction of the drive parts 2 is disclosed in the closest analogue, patent No. 180057) ... This stage of operation is shown in FIG. 5.

With a further increase in pressure inside the housing 7 above the set value of the actuation pressure of the actuator 4 indicated on the scale 24: under the action of the increasing pressure in the cavity of the housing 7, the actuator rod 45, overcoming the force of the compression spring 43, moves upward into the actuator cavity with atmospheric pressure, the axial movement of the rod 45 through the axis 35 is transmitted to the lever 36, which, being on the axis 34, fixedly installed in the sleeve 40, converts the axial movement of the rod 45 into the longitudinal movement of the T-shaped part of the lever 36 (Fig. 8 (callout D "with increasing pressure")), the drive lever 36 comes out of engagement with the stop 48, releasing the slammer 16, which, under the influence of its own weight and the flow of the medium, rotates on the axis 13 and is pressed against the seat of the body 7, partially blocking the flow of the working medium and leaving only the discharge opening in the slammer 16 open. This stage of actuation is shown in Fig. 6. After the slammer 16 closes the passage opening in the housing 7, the pressure continues to increase (with a sharp increase in pressure behind the slammer 4), the actuator lever 36 comes out of engagement with the fragment of the body "C" of the slamming deaf 17, which leads to its release by the drive, under its own weight and the flow of the flapper 17 is rotated on the axis 13 and pressed against the flapper 16, finally blocking the flow of the working medium. This stage of operation is shown in FIG. 7.

Valve operation when the pressure of the working medium in the pipeline drops below the value set by the settings of the actuator 4.

The principle of operation of the valve consists in mechanically unlocking the gate 15 by the drive 4 in case of an emergency decrease in the pressure of the working medium in the pipeline, since the drive 2 and the gate 12 in engagement with it remain in the initial position.

When the pressure inside the housing 7 drops below the set value of the actuation pressure of the actuator 4 indicated on the scale 25: under the action of the decreasing pressure in the cavity of the housing 7, the actuator rod 45, under the action of the compression force of the compression spring 44 moves down into the actuator cavity with decreasing pressure, the axial movement of the rod 45 through the axis 35 is transferred to the lever 36, which, being on the axis 34, fixedly in the sleeve 40 converts the axial movement of the rod 45 into the longitudinal movement of the T-shaped part of the lever 36 (Fig. 8 (callout D "when the pressure is reduced")), the lever 36 drive 4 releases the slammer 16, which, under the action of its own weight and the flow of the medium, rotates on the axis 13 and is pressed against the seat of the housing 7, partially blocking the flow of the working medium and leaving only the discharge opening in the slammer 16 open. After the slammer 16 closes the passage opening in the housing 7, in the cavity of the housing 7, the pressure continues to decrease, the lever 36 of the drive 4 comes out of engagement I, with a fragment of the body "C", slammers are deaf 17, while the lever releases the slammer 17, which, under the influence of its own weight and the flow of the medium, rotates on the axis 13 and is pressed against the saddle of the slammer 16, finally blocking the flow of the working medium.

The shutter 12 is locked in the OPEN position by translating
handle 3 of drive 2 to the STOP position, while handle 20 of the lifting unit
claps 19 must be in the STOP position.

The shutter 15 is locked in the OPEN position by moving
handle 5 of drive 4 to the STOP position, while handle 22 of the lifting unit
clap 21 must be in the STOP position.

Local - manual (forced) actuation of the valve to CLOSE is performed by turning the knobs 3 and 5 of actuators 2 and 4 to the MANUAL position, while the knobs 20 and 22 of the lifting knots 19 and 21 should be in the AVT position.

Levers 3 and 5, 20 and 22 in the operating position of the valve must be in the AUT position. When knobs 3 and 5, 20 and 22 are in the STOP position, the valve cannot be triggered from a decrease and increase in pressure. The overflow valve 18 must be closed.

Lifting the shutter 15 with the handle 22 of the lifting unit 21 is allowed to be performed only after equalizing the pressure before and after the shutter 15 by opening the bypass valve 18.

Advantages and advantages of the offered shut-off valve:

there are no analogues in terms of a two-drive design with a three-stage shut-off of the medium flow in the event of an emergency increase in pressure in the pipeline;

practically eliminates the possibility of destruction of parts of the valve gates and the pipeline through which the medium containing the liquid fraction is transported at high speed and high pressure;

is capable of performing protective functions of cutting off the flow both in case of an emergency increase in pressure in it, and in case of an emergency decrease in pressure in it.

Claims (3)

1. A shut-off valve, including a body and working cavities interconnected by a through hole, in each of which there is a shutter equipped with a drive that fixes it in the open position with a sensitive element made in the form of a spring-loaded rod, characterized in that the first in the direction of movement of the transported medium, the shutter is combined and is made in the form of two flaps: flaps with a through hole, which in the closed position overlaps 90% of the area of the through hole between the working cavities, and a blind flap located with it on the same axis, the second in the direction of movement of the transported medium of the working cavity, the shutter made in the form of a slam with a through hole, which in the closed position overlaps 50% of the area of the through hole of the outlet cavity. 2. The shut-off valve according to claim 1, characterized in that the drives are made with the possibility of adjusting the response limit of the sensitive element of the drive. 3. The shut-off valve according to claim 1, characterized in that the sensitive element is made in the form of a spring-loaded rod with protrusions at the ends.

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