RU2794685C1 - Safety valve - Google Patents

Abstract

FIELD: valves.

SUBSTANCE: invention relates to shut-off devices with a rotary locking body and is intended for installation in wells of oil and gas condensate fields to automatically shut off a high-pressure pipeline in the event of an emergency pressure rise or drop in it. The shut-off valve comprises a body, inlet and outlet flanges, a seat, a rotary shut-off element located in the body, interacting with the drive of the actuation device for decreasing and/or increasing pressure located on the body, holding the shut-off body in the open position, a latch with stops and a sensitive element made in the form of a rod loaded with springs, connected with a latch that holds the stopper in the open position with stops. The shut-off element is made in the form of a plate, the seat is made removable and installed in the bore of the outlet flange, sealed with a rubber ring and fixed in the axial direction by the plate fastening bracket and the strap, the actuation device drive is of spring type and equipped with a position indicator of the sensing element rod, configured for visual control of the position rod, and movable scales of the response pressure of the sensing element adapted for mounting on the scales of the actual response pressures of the sensing element during adjustment. The shut-off valve has a relatively simple design, reliable when actuated by a pressure drop or rise and shutting off the pipeline.

EFFECT: replacing the seat in case of leakage of the shut-off body and visual control over the position of the stem of the sensitive element and the response pressures of the sensitive element during adjustment and during operation of the valve.

1 cl, 3 dwg

Description

The present invention relates to valve building, in particular to shut-off devices with a rotary locking body, and is intended for installation in wells of oil and gas condensate fields to automatically shut off a high-pressure pipeline in case of an emergency decrease or increase in pressure in it.

A shut-off valve is known from the prior art (RF Patent No. 2476746, IPC: F16K 17/04, F16K 15/03, publ. 27.02.2013), containing a body with a through passage and connecting flanges, a seat, a rotary shut-off valve in the form of a damper, placed in the body in the immediate vicinity of the seat and interacting with the mechanism of the actuation device for lowering and / or increasing pressure located on the body. Said mechanism comprises a housing with a nut. The nut with its bearing inner surface interacts through the thrust bearing with one bearing surface of the high-pressure spring, and the other bearing surface with the bearing surface of the sleeve. The sleeve is made with the possibility of axial movement and is installed inside the said housing. A sleeve is installed with the possibility of axial movement inside the specified sleeve. The sleeve interacts with the bearing surface of the low pressure spring mounted on the stem. The rod is located inside the mentioned sleeve and is made with the possibility of axial movement. The other bearing surface of the sleeve interacts with the bearing surface of the rod. The device for fixing the damper in the open position is made in the form of a cylinder. The cylinder is made with the possibility of axial movement in the tip of the said rod. In the walls of the cylinder, spring-loaded balls are located with the possibility of radial movement. A cylinder is installed on the outer surface of the damper. The cylinder has at least one annular profiled groove.

In the embodiment, on the outer surface of the trigger mechanism housing there is a scale for determining the preload force of the high pressure spring, and on the outer surface of the sleeve installed in the sleeve, there is a scale for determining the preload force of the low pressure spring.

The main disadvantages of this valve are the significant complexity of the design of the damper fixation device, low reliability due to the complexity of the design, and low maintainability due to the fact that the seat is not removable and is made in one piece with the outlet flange. Also, there is no stem position indicator in the design of the valve actuation mechanism, and the scales for determining the preload of the springs show the preload force of the springs, and not the pressure of the sensing element, which requires recalculating the preload force of the springs into pressure when setting the valve to certain pressure limits. It is not possible, when fine-tuning the set pressures, to set the scales to the actual set pressure due to their immobility.

Also known from the prior art is a shut-off device (RF patent No. 2313714, IPC: F16K 17/04, F16K 39/04, publ. 12/27/2007, prototype), containing a body, a rotary shut-off body located in it, holding the shut-off body in the open position a latch with stops and a sensing element made in the form of a rod loaded with springs, wherein the rod of the sensing element is connected to the latch, and the latch holds the locking element in the open position with stops. In the horizontal (open) position, the locking body is driven by a handle. To equalize the pressure before and after the rotary shut-off element, a valve is installed on the body before opening it. Limits of response of the sensing element from a decrease and increase in pressure from the allowable one are set by caps.

The main disadvantages of this valve are low maintainability due to the fact that the seat is not removable and is made in one piece with the outlet flange, as well as the absence of a stem position indicator and response pressure scales of the sensitive element in the design of the valve actuation mechanism.

The objective of this invention is to create a shut-off valve of a relatively simple design, reliable when actuated by a decrease and increase in the pressure of the conducted medium and shutting off the pipeline, with the possibility of replacing the seat in case of leakage of the shut-off body, as well as with the possibility of visual control over the position of the rod of the sensitive element and pressures actuation of the sensing element during adjustment and during operation of the valve.

This task is achieved by the fact that in the shut-off valve, containing a body, inlet and outlet flanges, a seat, a rotary shut-off element located in the body, interacting with the drive of the device for lowering and/or increasing pressure located on the body, holding the shut-off body in in the open position, a latch with stops and a sensing element made in the form of a rod loaded with springs connected to a latch holding the shut-off body in the open position with stops; and fixed in the axial direction by the plate fastening bracket and the bar, the actuation device drive is spring-loaded and equipped with a position indicator of the sensitive element rod, with the possibility of visual control of the position of the rod, and movable scales of the response pressure of the sensitive element, with the possibility of setting on the scales of the actual response pressures of the sensitive element when setting.

The essence of the invention is illustrated by drawings, where figure 1 shows a main view of the proposed valve with the location of the plate of the shut-off body, the actuator retainer, bypass valve, fastening the seat in the bore of the outlet flange, the position indicator of the stem and the response pressure scale with increasing pressure, figure 2 - section A-A with the location of the shut-off element, the seat fastening strap, the mechanism for lifting the plate of the shut-off body, the actuator (mechanism) for actuating the valve and the scale of the actuation pressure when the pressure drops, in Fig. 3 - section B-B with the location of the valve plate and its attachment to the outlet flange.

In the figures, positions are indicated:

1 - valve,

2 - mechanical drive, configured to operate when pressure increases or decreases in the valve body,

3 - drive handle,

4 - eye bolts,

5 - body,

6 - inlet flange,

7 - outlet flange,

8 - plate axis,

9 - plate mounting bracket,

10 - plate,

11 - bypass valve,

12 - plate lifting mechanism,

13 - handle of the plate lifting mechanism,

14 - scale for adjusting the actuation of the actuator in case of an emergency increase in pressure,

15 - scale for adjusting the actuation of the drive in case of an emergency pressure drop,

16, 17, 18 - rubber sealing rings,

19 - hairpin,

20, 21 - nuts,

22, 23 - axes,

24 - drive lock,

25, 26 - rubber sealing rings,

27 - hairpin,

28 - bushing,

29 - screw,

30 - nut,

31 - compression spring for setting operation when pressure increases,

32 - compression spring for setting operation when the pressure drops,

33 - stock,

34 - cap,

35 - plate stop,

36 - saddle,

37 - seat sealing ring,

38 - saddle attachment bar.

The device and its operation

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

The valve consists of: valve 1; spring actuator 2, with automatic actuation to CLOSE when the value of the actuation pressure in the valve, set by the actuator settings, is reached, with an increase or decrease in the pressure of the working medium. 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.

The drive setting (Fig. 2) for operation in case of an emergency increase in pressure in the housing is carried out by achieving a certain compression force of the spring 31 with the nut 30.

The drive is set to operate in case of an emergency pressure drop in the housing by achieving a certain compression force of the spring 32 by screw 29. The cap 34 provides protection of the drive from the effects of the external environment and violation of the setting ranges.

For installation and dismantling of the valve on the pipeline, eyebolts 4 are provided (Figure 1).

The valve 1 (Figure 1) includes: body 5, inlet 6 and outlet 7 flanges, which are attached to the body 5 with studs 19 and nuts 20, installed in the bore of the outlet flange removable seat 36, sealed with a rubber ring 37 and fixed in the axial direction of the plate mounting bracket 9 and the bar 38.

On the axis 8 of the bracket 9, mounted on the outlet flange 7, a plate 10 is installed, designed to completely shut off the flow of the working medium when the valve is actuated to CLOSE when the pressure of the working medium rises or falls above or below the values set by the settings of drive 2.

To equalize the pressure of the working medium before and after the plate 10 on the outlet flange 7 is installed bypass valve 11 (Fig.1).

To install the plate 10 in the working position (OPEN), the mechanism for lifting the plate 12 with the handle 13 is installed on the body 5.

The plate lifting mechanism is installed in the side hole of the body 5 and fixed to the body with studs 27 and nuts 21.

The tightness of the flow of the working medium in relation to the environment is ensured by rubber sealing rings 16, 17, 18, 25, 26.

Valve operation.

The principle of operation of the valve consists in the mechanical unlocking of the plate 10 by the drive 2 when the pressure of the working medium in the pipeline goes beyond the range set by the valve settings.

Forced operation of the valve is carried out by transferring the handle 3 of the drive 2 to the MANUAL position, while the handle of the plate lifting mechanism 13 must be in the ABT position.

Blocking of the plate 10 in the OPEN position is performed by moving the handle 3 of the actuator 2 to the STOP position.

In the mode of valve readiness for operation, the handle 3 of the drive 2 and the handle of the plate lifting mechanism 13 must be in the ABT position. When the handles are in the STOP position. valve operation is not possible.

Setting the valve disc 10 to the OPEN position is carried out as follows:

- shut off the supply of the working medium with fittings located upstream of the valve;

- open the bypass valve 11 and equalize the pressure before and after the plate;

- set the handle 3 of drive 2 to the MANUAL position;

- pull and turn the handle of the plate lifting mechanism 13 to the STOP position;

- turn handle 3 of drive 2 to the STOP position;

- move the handle of the plate lifting mechanism 13 to the ABT position;

- close the bypass valve 11.

Commissioning and commissioning.

At the factory, the valve actuator is set to the set pressure values specified in the passport.

Rough reconfiguration of the actuator to other set pressure values is performed:

- to reduce the pressure by setting the screw 29 of the drive 2 with its end to the scale mark 15 corresponding to the required pressure;

- to increase the pressure by setting the nut 30 with its end to the scale mark 14 corresponding to the required pressure.

Accurate reconfiguration of the actuator to the required value of the set pressure when the pressure drops is carried out in the following sequence:

- shut off the supply of the working medium with fittings located upstream of the valve;

- open bypass valve 11 and equalize the pressure before and after plate 10;

- set the handle 3 of drive 2 to the MANUAL position;

- pull and turn the handle of the plate lifting mechanism 13 to the STOP position;

- turn handle 3 of drive 2 to the STOP position;

- move the handle of the plate lifting mechanism 13 to the ABT position;

- close bypass valve 11;

- supply the working medium to the section of the pipeline with the valve and provide it with a pressure at which operation should occur;

- shut off the pipeline section with the valve with stop valves located before and after the valve;

- open bypass valve 11;

- unscrew the screw 29 to the position “6 MPa”, weakening the spring 32 as much as possible;

- the handle 3 of the drive 2 should be moved to the ABT position;

- slowly, compressing the spring 32 with the screw 29, fix the fall of the plate of the locking body "by ear" and according to the rod position indicator (the rod must be in the lower position), while the position of the screw 29 is required;

- open plate 10 in the sequence described earlier.

Actuator 2 is fine-tuned to the desired actuation value on pressure increase in the following sequence:

- open plate 10;

- supply the working medium to the section of the pipeline with the valve and provide it with a pressure at which operation should occur;

- shut off the pipeline section with the valve with stop valves located before and after the valve;

- open bypass valve 11;

- tighten nut 30, compressing spring 31 as much as possible;

- the handle 3 of the drive 2 should be moved to the ABT position;

- slowly unscrew the nut 30, loosening the spring 31, achieve the actuation of the locking device, fixing the fall of the plate 10 "by ear" and according to the rod position indicator (the rod must be in the upper position);

- reset the scale 14, aligning the corresponding value of the scale on the end face of the nut 30 with the value of the actuation pressure;

- open the plate 10 in the sequence described earlier.

The valve should be put into operation after its installation on the pipeline and adjustment in the following sequence:

- resume the supply of the working medium;

- pull and turn handle 3 of drive 2 from the STOP position. to the ABT position.

When the pressure inside the housing 5 rises above the set value of the actuation pressure of the drive 2, indicated on the scale 14, the drive rod 33, overcoming the force of the compression spring 31, moves up into the drive cavity with atmospheric pressure, the axial movement of the rod 33 through the axis 23 is transmitted to the latch 24, which being on the axis 22 fixed in the sleeve 28, it converts the axial movement of the rod 33 into the longitudinal movement of the T-shaped part of the latch 24, the latch 24 disengages from the stop 35, releasing the plate 10, which, under the action of its own weight and the flow of the medium, rotates on the axis 8 and is pressed against the saddle 36, blocking the flow of the worker.

Valve operation when the pressure of the working medium in the pipeline drops below the value set by the actuator 2 settings.

When the pressure inside the housing 5 drops below the set value of the actuation pressure of the actuator 2 indicated on the scale 15, the rod 33 of the actuator, under the action of the force of the spring 32, moves down into the cavity of the actuator with decreasing pressure, the axial movement of the rod 33 through the axis 23 is transmitted to the latch 24, which, being on axis 22, fixed in the sleeve 28, converts the axial movement of the rod 33 into the longitudinal movement of the T-shaped part of the latch 24, the latch 24 releases the plate 10, which, under the influence of its own weight and the flow of the medium, rotates on the axis 8 and is pressed against the saddle 36, blocking the flow of the working environment.

The blocking of the plate in the OPEN position is carried out by transferring the handle 3 of the drive 2 to the STOP position, while the handle of the plate lifting mechanism 13 must be in the STOP position.

Manual (forced) actuation of the valve to CLOSE is performed by turning the handle 3 of the actuator 2 to the MANUAL position, while the handle of the plate lifting mechanism 13 must be in the AUTO position.

Handles 3 and 13 in the working position of the valve must be in the AUT position, when handles 3 and 13 are in the STOP position, the valve can not be actuated by a decrease and increase in pressure. Bypass valve 11 must be closed.

Lifting the plate 10 with the handle 13 is allowed only after equalizing the pressure before and after the plate 10 by opening the bypass valve 11.

In the event of a leak in the shut-off body, it is possible to replace the seat 36, which is carried out on the valve dismantled from the pipeline and the outlet flange 7 disconnected from the body, in the bore of which the seat is fixed.

Seat replacement is carried out in the following sequence:

- fastening bolts are unscrewed and bracket 9 with plate 10 and strap 38 are disconnected from the output flange 7;

- seat 36 with a rubber sealing ring 37 is removed from the bore of the output flange and, if necessary, can be repaired or replaced with a new one.

- installation of a repaired or new seat in the bore of the output flange is carried out in the reverse order.

With a relatively simple design of the device and, due to the fact that the seat is made removable, there is an indicator of the position of the sensing element rod, and the response pressure scales of the sensing element are movable with the possibility of setting to the actual response pressures of the sensing element, the reliability of the device is ensured when actuated by a decrease and increase in pressure conductive medium and shutting off the pipeline, the possibility of replacing the seat in case of leakage of the shut-off body, as well as the possibility of visual control over the position of the stem of the sensitive element and the response pressure of the sensitive element during adjustment and during operation of the valve.

Claims (1)

Shut-off valve, comprising a body, inlet and outlet flanges, a seat, a rotary shut-off element located in the body, interacting with the drive of the actuation device for lowering and / or increasing pressure located on the body, holding the shut-off body in the open position with a latch with stops and a sensitive an element made in the form of a spring-loaded rod connected to a latch holding the stops in the open position the shut-off body, characterized in that the shut-off body is made in the form of a plate, the seat is made removable and installed in the bore of the outlet flange, sealed with a rubber ring and fixed in the axial direction plate fastening bracket and strap, actuation device drive is spring-loaded and equipped with a sensor rod position indicator, with the possibility of visual control of the rod position, and movable sensor response pressure scales, with the possibility of setting on the scales of the actual response pressure of the sensitive element during adjustment.

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