RU2766505C1 - Shutoff valve - Google Patents

Abstract

FIELD: machine building.SUBSTANCE: disclosed is a shut-off valve comprising: a body with inlet and outlet channels, a gate closing the outlet channel, consisting of a main flap with a discharge opening and an additional blind flap configured to close the blind flap discharge opening, mechanical drive to rotate the bolt, which includes: a compression spring, an extension spring, a rod and a lever connected to the rod, and a bolt lifting assembly, which includes a handle connected to the lever, which lift and lock the bolt. At the same time in the housing with inlet and outlet channels there installed is the second gate blocking the outlet channel, consisting of the second main flap with a discharge hole and a second additional blind flap configured to close the unloading hole of the blind flap, and a corresponding second mechanical drive which rotates the second gate, which includes: a compression spring, tension spring, rod and lever connected with rod, as well as second assembly for lifting the second bolt, including handle connected with second lever, lifting and fixing the second bolt.EFFECT: invention is aimed at increasing the reliability of the device and reducing the cost of the shutoff valve operating at simultaneous production and pumping of gas.6 cl, 8 dwg

Description

The present invention relates to shut-off and control devices, in particular valves designed to automatically shut off the pipeline. The valve is designed for use in pipelines of oil and gas fields and underground gas storages.

Known patent of Russia No. 55969 dated 08/27/2006, which discloses a device for monitoring and regulating the flow, containing a pipeline, a control valve with a rotary shut-off body connected to the shut-off body drive, pressure selection lines, medium pressure sensors. At the same time, the first and second pressure sampling lines are located respectively in the first and second measuring sections, which are located on the sides of the inlet and outlet openings of the control valve, forming a single pipeline complex, a controlled electric drive of the shut-off body is introduced, which is controlled by a computer-control device connected by electrical connections with a locking element rotation angle setting device, with the first and second pressure sensors and a device for indicating the rotation angle of the shutoff element and the calculated flow rate of the flow medium.

The disadvantage of this device is the impossibility of automatic stepwise shutoff of the flow with increasing or decreasing pressure.

The closest technical solution is Russian patent No. 198735 dated 07/24/2020. In this patent, a shut-off valve is disclosed, containing: a body with inlet and outlet channels, a shut-off element that closes the outlet channel and a mechanical drive that rotates the shut-off body. In this case, a shutter controlled by a mechanical drive is used as a shut-off element, consisting of a main flap with a discharge opening and an additional blind flap, made with the ability to close the discharge opening of the blind flap when the pressure inside the device body decreases or rises above the set value. In addition, the device includes a mechanism for remote actuation of the actuator, which includes an electromagnet, an L-shaped lever and a stem, where the electromagnet is configured to control the L-shaped lever connected to the rod that controls the mechanical drive rod, as well as a bolt lifting unit, including a handle associated with the lever, lifting and fixing the shutter. The disadvantage of this device is the lack of safety of the device, with simultaneous production and injection of gas. This lack of safety is due to the fact that if it is necessary to simultaneously produce and pump gas, it is necessary to use two identical shut-off valves made according to patent No. 198735.

Functional purpose of the valve:

automatic shutdown of the pipeline when the pressure in the pipeline reaches the values set by the valve settings:

a) when pressure decreases during production, as well as during gas injection;

b) with an increase in pressure during production, as well as during gas injection;

local overlapping of the pipeline - manual doublers of valve drives.

The technical result of the proposed solution is to increase the reliability of the device and reduce the cost of the shut-off valve operating with simultaneous production and injection of gas.

The technical result is achieved by the fact that the shut-off valve contains:

- housing with inlet and outlet channels,

- a shutter blocking the outlet channel, consisting of a main flap with an unloading hole and an additional blind flap, made with the ability to block the discharge opening of the blind flap,

- a mechanical drive that rotates the shutter, including: a compression spring, an extension spring, a stem and a lever connected to the stem, and

- a bolt lifting unit, including a handle connected to a lever that lifts and locks the bolt.

At the same time, in the housing with inlet and outlet channels, the following is installed: a second shutter blocking the outlet channel, consisting of a second main flap with an unloading hole and a second additional blind flap made with the ability to block the discharge opening of the blind flap and, corresponding to it, a second mechanical drive that performs rotation of the second shutter, including: a compression spring, an extension spring, a stem and a lever connected to the stem.

The first and second mechanical drives are identical and work alternately. So, when the pressure inside the device body drops above the set value, the tension spring of one of the drives displaces the stem, which in turn turns the corresponding lever, which first disengages from the main flap stop, and thereby freeing the main flap, which, under the action of its own weight and the medium flow turns and restricts the flow, and then disengages from the stop of the blind flap, and thereby releasing the blind flap, which, under the influence of its own weight and the flow of the medium, turns and completely blocks the flow.

And when the pressure inside the device body rises above the set value, the rod, overcoming the force of the compression spring, turns the lever associated with it, which first disengages from the stop of the main flap, and thereby releasing the main flap, which, under the influence of its own weight and the flow of the medium, rotates and limits flow, and then disengaging from the stop of the blind flap, and thereby releasing the blind flap, which, under the influence of its own weight and the flow of the medium, rotates and completely blocks the flow,

The springs of the first and second mechanical drives can be either the same or different - they are tuned to work at different pressures inside the device case.

Each mechanical actuator contains a scale for setting the limits of valve actuation when the pressure inside the device case decreases and a scale for setting the limits for valve operation when the pressure inside the device case increases.

The valve also contains bypass valves for equalizing the pressure of the medium before and after the shutter.

The valve contains the first handle that allows you to manually move the first shutter, opening or blocking the outlet channel.

The valve also contains a second handle that allows you to manually move the second shutter, forcibly blocking the outlet channel.

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

It is installed on a horizontal section of the pipeline with drives upwards in accordance with the arrow indicating the direction of movement of the working medium.

The design of the valve is shown in Fig.1-3, where

figure 1 shows a main view showing the main components and individual parts of the shut-off valve;

figure 2 shows the main view with sections of the main elements of the valve, indicating the main details;

figure 3 shows a section A-A of the valve indicating the operating position of the main components.

figure 4 shows the valve with the shutter position after automatic actuation of the actuator during gas production;

figure 5 shows the valve with the initial position of the gates (valve readiness for automatic operation during gas production);

figure 6 shows the valve with an intermediate position of the shutter (unlocking the main flap);

figure 7 shows the valve after the shutter is fully activated and the passage hole in the lid is closed (unlocking the additional flap);

Fig.8 shows a spring drive for actuation during gas production in the section.

The valve contains:

1 - valve;

2 - spring drive for operation during gas production;

3 - handle of the spring drive for actuation during gas production;

4 - spring drive for operation during gas injection;

5 - handle of the spring drive for actuation during gas injection;

6 - eye bolt;

7 - body;

8 - inlet cover;

9 - outlet cover;

10 - axis;

11 - bracket;

12 - shutter;

13 - axis;

14 - bracket;

15 - shutter;

16 - main flap with a discharge opening;

17 - additional flap, deaf;

18 - main flap with a discharge opening;

19 - additional flap, deaf;

20, 21 - bypass valves;

22 - company plate;

23 - flap lifting unit;

24 - handle of the lifting unit clap;

25 - flap lifting unit;

26 - handle of the flap lifting unit;

27-30 - scales;

31, 32 - drive levers;

33 - emphasis;

34, 35 - axes;

36 - cap;

37 - sealing ring;

38 - stem seal;

39 - protective ring;

40 - bushing;

41 - screw;

42 - nut;

43 - compression spring, actuating the actuator when the pressure rises

44 - compression spring, actuating the actuator when the pressure drops

45 - stock.

Figure 1 shows:

- spring actuator, with automatic operation to CLOSE when valve 1 reaches the actuation pressure value set by the actuator settings, in case of pressure decrease/increase during gas production (hereinafter - actuator 2). The drive 2 has a handle 3 designed to transfer the sensitive actuation mechanism of the drive from the ABT position. to the MANUAL position. or STOP;

- spring actuator, with automatic operation to CLOSE when valve 1 reaches the actuation pressure value set by the actuator settings, in case of pressure decrease/increase during gas injection (hereinafter - actuator 4). The drive 4 has a handle 5 designed to transfer the sensitive actuation mechanism of the drive from the ABT position. to the MANUAL position. or STOP;

- eye bolts 6 for mounting and dismounting the valve on the pipeline;

- company plate 22 indicating the direction of the medium flow during gas extraction and gas injection, nominal pressure and nominal passage.

The setting of the mechanical drive 2 or 4 (see Fig.8) is as follows:

- to actuate when the pressure decreases, the screw 41 presses (adjusts) the compression spring 44 to a certain force corresponding to the required actuation value on the scale 27;

- to actuate when the pressure increases, the nut 42 presses (adjusts) the compression spring 43 to a certain force corresponding to the required actuation value, according to the scale 28.

In order to prevent violation of the setting limits and exclude mechanical damage to parts, a cap 36 is installed on the drive.

The tightness of the actuator at the installation site in the valve body from the pressure of the transported medium is ensured by rubber sealing rings 37-38 and a protective ring 39.

The valve 1 (Figure 2) includes: body 7, inlet 8 and outlet 9 cover.

On the axis 10 of the bracket 11 of the outlet cover 9, a shutter 12 is installed, designed to shut off the flow of the working medium when the drive 2 is activated during gas production.

On the axis 13 of the bracket 14 of the inlet cover 8, a shutter 15 is installed, designed to shut off the flow of the working medium when the drive 4 is activated when gas is pumped.

The shutter 12 consists of the main flap 16 with a discharge hole and an additional blind flap 17.

The shutter 15 consists of the main flap 18 with a discharge hole and an additional blind flap 19.

The design of the gates 12 and 15 with stepped overlapping of the through holes in the covers 8 and 9 is due to the need to prevent a sharp increase in pressure at the moment the valve is actuated to CLOSE during gas production or injection.

To equalize the pressure of the medium before and after the shutter 12, a bypass valve 20 is installed on the cover 9.

To equalize the pressure of the medium before and after the shutter 15, a bypass valve 21 is installed on the cover 8.

To install the shutter 12 in the working position (OPEN), the body 7 is equipped with a lifting unit clapping 23 with a handle 24.

To install the shutter 15 in the working position (OPEN), on the body 7 there is a lifting unit clap 25 with a handle 26.

Valve operation during gas production.

The initial position of the valve - the handle 26 of the lifting assembly flap 25 must be in the STOP position. The shutter 15 must be fixed by the lever 32 of the drive 4, the handle 5 must be in the STOP position. This position of the actuator 4 corresponds to its blocking and the inability to actuate when the pressure increases/decreases in the housing 7 of the valve 1 during gas production.

The principle of operation of the valve is to mechanically unlock the gate 12 by the actuator 2 in case of an emergency decrease or increase in the pressure of the working medium in the pipeline.

When the pressure inside the housing 7 drops below the set value of the actuation pressure of the drive 2 indicated on the scale 27:

the force of the compression spring 44 transmits the axial movement to the drive rod 45, which, in turn, due to the pressure decreasing in the housing cavity, moves down, the axial movement of the rod 45 through the axis 35 is transmitted to the drive lever 31, which, being on the axis 34, which is fixedly installed in the sleeve 40, converts the axial movement of the rod 45 in the longitudinal movement of the T-shaped part of the lever 31 (Fig.8 (View B "when the pressure decreases")),

the drive lever 31 disengages from the stop 33, releasing the flap 16, which, under the influence of its own weight and the flow of the medium, rotates on the axis 10 and is pressed against the end of the cover 9, blocking the flow of the transported medium and leaving only the discharge opening open;

in the body 7 the pressure continues to decrease (with a sharp drop in pressure behind the flap 4), the drive lever 31 disengages from a fragment of the body of the flap 17, which leads to its release by the drive, under the influence of its own weight and the flow of the medium, the flap rotates on the axis 10 and is pressed against flap 16, finally blocking the flow of the working medium.

When the pressure inside the housing 7 rises above the set value of the actuation pressure of the drive 2 indicated on the scale 28:

under the action of increasing pressure in the body cavity 7, the drive rod 45, overcoming the force of the compression spring 43, moves upward into the drive cavity with atmospheric pressure, the axial movement of the rod 45 through the axis 35 is transmitted to the lever 31, which, being on the axis 34, which is fixedly installed in the sleeve 40, converts the axial movement of the rod 45 in the longitudinal movement of the T-shaped part of the lever 31 (Fig.8 (View B "with increasing pressure")),

the drive lever 31 disengages from the stop 33, releasing the flap 16, which, under the influence of its own weight and the flow of the medium, rotates on the axis 10 and is pressed against the end of the cover 9, blocking the flow of the transported medium and leaving only the discharge opening open;

pressure continues to increase in the body 7 (with a sharp increase in pressure behind the flap 4), the drive lever 31 disengages from a fragment of the body of the flap 17, which leads to its release by the drive, under the influence of its own weight and the flow of the medium, the flap 17 rotates on the axis 10 and is pressed to the flap 16, finally blocking the flow of the working medium.

Blocking of the shutter 12 in the OPEN position is performed by transferring the handle 3 of the drive 2 to the STOP position, while the handle 24 of the lifting assembly, the flap 23 must be in the STOP position.

Local - manual (forced) actuation of the valve to CLOSE.

It is carried out by turning the handle 3 of the drive 2 to the MANUAL position, while the handle 24 of the lifting unit, the flap 23 must be in the ABT position.

Handles 3 and 24 in the working position of the valve must be in the ABT position; drive is blocked. Bypass valve 20 must be closed.

Lifting the shutter 12 with the handle 24 of the lifting unit, the flap 23 should be performed only after the pressure has equalized before and after the shutter 12 by opening the bypass valve 20.

Valve operation during gas injection.

The initial position of the valve - the handle 24 of the lifting assembly flap 23 must be in the STOP position. The shutter 12 must be fixed by the lever 31 of the drive 2, the handle 3 must be in the STOP position. . This position of the actuator 2 corresponds to its blocking and the inability to actuate when the pressure increases/decreases in the body 7 of the valve 1 during gas injection.

The principle of operation of the valve consists in the mechanical unlocking of the shutter 15 by the actuator 4 in case of an emergency decrease or increase in the pressure of the working medium in the pipeline.

The principle of interaction between the parts of drive 4 and shutter 15 is identical to that described above in the section “Valve operation during gas production”

Blocking of the shutter 15 in the OPEN position is performed by transferring the handle 5 of the drive 4 to the STOP position, while the handle 26 of the lifting assembly, the flap 25 must be in the STOP position.

Local - manual (forced) actuation of the valve to CLOSE.

It is carried out by turning the handle 5 of the drive 4 to the MANUAL position, while the handle 26 of the lifting unit, the flap 25 must be in the ABT position.

Handles 5 and 26 in the working position of the valve must be in the ABT position. drive is blocked. Bypass valve 21 must be closed.

Lifting the shutter 15 with the handle 26 of the lifting unit, the flap 25 should be performed only after the pressure has equalized before and after the shutter 15 by opening the bypass valve 21.

Advantages and advantages of the proposed shut-off valve:

- there are no analogues in terms of constructive 2-drive and execution;

- combines in one function of shut-off valves designed to ensure the safety of equipment and pipelines during gas injection and extraction;

- eliminates the need to install two shut-off valves to perform the functions of ensuring the safety of equipment and pipelines in case of an emergency increase / decrease in pressure of the working medium in the process of gas extraction and injection;

- relatively low cost of equipment.

Claims (11)

1. Shut-off valve, containing: - housing with inlet and outlet channels, - a shutter blocking the outlet channel, consisting of a main flap with an unloading hole and an additional blind flap, made with the ability to block the discharge opening of the blind flap, - a mechanical drive that rotates the valve, including: a compression spring, an extension spring, a stem and a lever connected to the stem, and - a bolt lifting unit, including a handle connected to a lever that lifts and locks the bolt, characterized in that the housing with the inlet and outlet channels has: a second shutter blocking the outlet channel, consisting of a second main flap with an unloading hole and a second additional blind flap configured to close the discharge opening of the blind flap, and a second mechanical drive corresponding to it, rotating the second shutter, including: a compression spring, an extension spring, a stem and a lever connected to the stem, as well as a second second shutter lifting unit, including a handle connected to the second lever, lifting and fixing the second shutter. 2. Shut-off valve according to claim 1 of the formula, characterized in that the springs of the first and second mechanical drives are configured to work at different pressures inside the device housing. 3. Shut-off valve according to claim 1 of the formula, characterized in that each mechanical drive contains a scale for setting the limits of valve operation when the pressure inside the device body decreases and a scale for setting the limits of valve operation when pressure increases inside the device case. 4. Shut-off valve according to claim 1 of the formula, characterized in that it contains bypass valves to equalize the pressure of the medium before and after the shutter. 5. Shut-off valve according to claim 1 of the formula, characterized in that it contains the first handle, which allows you to manually move the first shutter, opening or blocking the outlet channel. 6. Shut-off valve according to claim 1 of the formula, characterized in that it contains a second handle that allows you to manually move the second shutter, forcibly blocking the outlet channel.

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