RU198735U1 - Shut-off valve - Google Patents

Abstract

A shut-off valve is proposed, comprising: a housing with inlet and outlet channels, a shut-off element that closes the outlet channel and a mechanical drive that rotates the shut-off element. In this case, as a shut-off element, a shutter controlled by a mechanical drive is used, consisting of a main slammer with a discharge opening and an additional deaf slammer, made with the ability to close the unloading hole of a deaf slammer when the pressure inside the device body drops or rises above the adjusted one. In addition, the device includes a remote actuation mechanism of the drive, which includes an electromagnet, an L-shaped lever and a rod, where the electromagnet is configured to control an L-shaped lever associated with the rod that controls the mechanical drive rod, as well as a shutter lifting unit including a handle associated with the lever, lifting and locking the shutter. The technical result is to increase the reliability of the device.

Description

The proposed utility model relates to shut-off and control devices, in particular, valves designed to automatically shut off a pipeline.

The functional purpose of the device is to automatically shut off the pipeline when the pressure of the working medium changes (in case of an emergency increase in pressure in the pipeline) to the value set by the device setting. It is installed on technological pipelines of gas production enterprises that provide transportation, storage, processing of gas, etc.

Known device cutting off the patent of Russia No. 43328 from 10.01.2005. This device contains a housing, a shut-off element located in it, made in the form of a rotary damper, a latch holding the damper in an open position, and a sensitive element interacting with the shut-off element. In this case, the latch is made in the form of a permanent magnet.

The disadvantage of this device is the inability to automatically shut off the flow when the pressure rises or falls.

The closest source is the 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 element connected to the shut-off element drive, pressure take-off lines, and pressure sensors. In this case, the first and second pressure take-off 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 element is introduced, which is controlled by a computer and control device connected by electrical connections with a regulator of the angle of rotation of the shut-off element, with the first and second pressure sensors and a device for indicating the angle of rotation of the shut-off element and the calculated flow rate of the flowing medium.

The disadvantage of this device is the impossibility of automatic stepwise shutoff of the flow when the pressure rises or falls.

The technical result of the proposed solution is to increase the reliability of the device, due to the stepwise blocking of the flow, both in automatic mode and in manual mode.

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

housing with input and output channels,

a shut-off element that closes the outlet channel and

mechanical drive that rotates the shut-off element.

In this case, a shutter consisting of a main slammer with a discharge opening and an additional deaf slammer made with the ability to block the deaf slammer discharge opening are used as a shut-off element. The mechanical drive includes: a compression spring, an extension spring, a stem and a lever connected to the stem. The mechanical drive is designed in such a way that when the pressure inside the device body drops above the adjusted one, the tension spring displaces the rod, which in turn rotates the lever, which first disengages from the main slam stop, and thereby releases the main slam, which, under its own weight and the flow of the medium turns and restricts the flow, and then the deaf slammer comes out of engagement from the stop, and thereby releases the deaf slam, 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 is higher than the adjusted one, the stem, overcoming the force of the compression spring, turns the lever associated with it, first disengaging from the stop of the main slam, and thereby releasing the main slam, which, under the influence of its own weight and the flow of the medium, turns and restricts the flow, and then disengages from the stop of the blind slam, and thus liberating dull slam, which, under the influence of its own weight and the flow of the medium, turns and completely blocks the flow.

In addition, the device includes a mechanism for remote actuation of the drive, which includes an electromagnet, an L-shaped lever and a rod, where the electromagnet is configured to control an L-shaped lever associated with the rod that controls the rod of the mechanical drive, as well as a shutter lifting unit including a handle associated with the lever, lifting and locking the shutter.

The slam-shut valve also contains a scale for setting the limits of the valve actuation at a decrease in pressure and a scale for setting the limits of the valve actuation at an increase in pressure.

The slam-shut valve also contains an overflow valve to equalize the pressure of the medium before and after the shutter.

The shut-off valve also contains a handle that allows you to manually move the shut-off element, opening the outlet channel.

The shut-off valve also contains a handle that allows you to manually move the shut-off element, forcibly closing the outlet channel.

The slam-shut valve also contains an indicator light showing the position of the shutter.

The essence of the claimed technical solution is illustrated by drawings of Figs. 1-9, where

figure 1 shows a drawing of the proposed shut-off valve - main view,

figure 2 shows a drawing of the proposed shut-off valve - side view,

figure 3 shows a section of the proposed shut-off valve at the location of the bypass valve and the slammer lifting unit,

Fig. 4 shows a section of the proposed shut-off valve - in working condition (the claps are raised),

Fig. 5 shows a section of the proposed slam-shut valve - after the first stage of operation and partial blocking of the outlet channel (the slammer with the discharge opening is omitted),

Fig. 6 shows a section of the proposed slam-shut valve - the field of the second stage of actuation and complete closure of the outlet channel (slammers are omitted),

Fig. 7 shows a mechanical drive,

Fig. 8 shows a section of the proposed shut-off valve - after the shutter lift assembly is triggered,

in fig. 9 shows a section of the proposed slam-shut valve - before ("position 1" and after ("position 2") fixation of the axial slam stop by the mechanical drive lever.

In the figures, reference numbers refer to the following positions:

1 - case

2 - cover

3 - shutter

4 - main flap (with discharge opening)

5 - additional clap (deaf)

6 - gate lifting unit

7 - handle of the shutter lifting unit

8 - shutter axis

9 - bracket

10 - electromagnet

11 - alarm switch

12 - control post

13 - signal lamp

14 - terminal box

15 - drive handle

16 - bypass valve

17 - eye bolt

18 - pointer

19 - shutter position scale

20 - bushing

21 - blocking unit stem

22 - locking bolt

23 - scale for setting the limits of operation when pressure drops

24 - scale for setting the response limits when pressure rises

25 - drive lever

26 - stop

27 - lever of the blocking unit

28 - screw with a scale

29 - compression spring that actuates the drive when pressure is reduced

30 - compression spring that actuates the drive when pressure rises

31 - nut

32 - drive rod

33 - nut

34; 35 - drive axes

36 - cap

37; 38 - rubber sealing rings

39 - protective ring

40 - bushing

41 - lever

42 - roller

43 - bracket

The device consists of a valve and an actuator.

The valve includes:

body 1, cover 2, shutter 3, consisting of a main slammer 4 with a discharge opening and an additional deaf slammer 5, a bolt lifting unit 6 with a handle 7.

The design of the shutter 3 is due to the need to prevent a sharp decrease or increase in pressure at the time of the device.

The shutter 3 is installed on the axis 8 of the bracket 9.

The mechanical drive, with automatic actuation, includes: electromagnet 10, alarm switch 11, control post 12 with signal lamp 13, terminal box 14, handle 15, designed to transfer the sensitive actuation mechanism of the actuator from the AVT position. to the position MANUAL. or STOP.

To equalize the pressure of the medium before and after the shutter 3, the device is equipped with a bypass valve 16.

For slinging the device during installation and dismantling on the pipeline, eye-bolts 17 are provided.

The indication of the position of the gate 3 is carried out by the signaling switch 11 with the issuance of a discrete signal, the issuance of light indication by the signal lamp 13 of the control station 12, as well as the mechanical indicator (hereinafter - the indicator 18) of the position:

in the OPEN position, the signaling switch 11 issues a discrete signal, while the control station 12 does not give out light indication, and the pointer 18 is at risk with the mark "O" on the scale 19;

in the CLOSED position, the alarm switch 11 gives out a discrete signal, while the control station 12 gives out light indication, and the pointer 18 is at risk with the mark "З" of the scale 19.

The mechanical drive (see Fig. 7) is configured as follows:

for triggering when the pressure in the housing 1 is lowered, the compression spring 29 is compressed (adjusted) by the screw 28 to a certain force corresponding to the required triggering value on the scale 23;

to be triggered when the pressure in the housing 1 rises - the compression spring 30 is compressed (adjusted) by the nut 31 to a certain force corresponding to the required response value, on the scale 24.

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

The tightness of the actuator at the installation site in the housing 1 from the effect of the pressure of the transported medium is ensured by rubber sealing rings 37-38 and a protective ring 39.

Start-up of the shut-off valve (return to the initial operating position).

The device is put into operation, after it is installed on the pipeline and connected to the control unit, in the following sequence:

supply the working medium to the pipeline with the device installed in it (the set value of the actuation pressure of the actuator from a decrease in pressure must be lower than the pressure in the pipeline by at least 1 MPa, and from an increase in pressure must exceed the pressure in the pipeline by at least 1 MPa);

apply voltage to electromagnet 10, thereby fixing the rod 21
sleeve 20 of the mechanism for remote actuation of the drive (see figure 2);

remove bolt 22, thereby unblocking electromagnet 10;

pull back and turn the handle 7 of the shutter lift assembly 6 until it stops in the AVT position;

pull back and turn the handle 15 of the drive to the AVT position;

resume the supply of the working medium.

Handles 7 and 15 in the operating position of the device must be in the AUT position. When the handles 7 and 15 are in the STOP position, the device cannot be triggered from lowering and increasing pressure.

Device operation

The principle of operation of the device consists in the mechanical unblocking of the gate 3 by the drive in case of an emergency decrease or increase in the pressure of the working medium in the pipeline.

To exclude water hammer and violation of the integrity of the parts of the shut-off element, a shutter design with a stepped overlap of the through hole in the cover 2 is provided.

The position of the slammer 4 with a discharge opening and the slammer 5 deaf at the first stage of operation is shown in Fig. 5, the position of the slammer 4 with the discharge opening and the slammer 5 deaf at the second stage of actuation is shown in Fig. 6.

1. Actuation of the device for CLOSING in automatic mode.

When the pressure inside the housing 1 drops below the set value of the actuating pressure of the actuator indicated on the scale 23:

the force of the compression spring 29 acts on the end face of the nut 33 transfers the axial movement to the actuator rod 32, which, in turn, due to the pressure decreasing in the cavity of the housing, moves downward, the axial movement of the rod 32 through the axis 35 is transferred to the actuator lever 25, which is fixed on the axis 34 in the sleeve 40 converts the axial movement of the rod 32 into the longitudinal movement of the T-shaped part of the lever 25 (Fig. 7 (View D "when the pressure decreases")),

the drive lever 25 disengages from the stop 26, releasing the slammer 4, which, under the action of its own weight and the flow of the medium, rotates on the axis 8 and is pressed against the end of the cover 2, blocking the flow of the transported medium and leaving only the discharge opening open;

in the housing 1, the pressure continues to decrease (with a sharp drop in pressure behind the slammer 4), the drive lever 25 comes out of engagement with a fragment of the slammer body 5, which leads to its release by the drive, under the action of its own weight and the flow of the medium, the slammer 5 rotates on the axis 8 and is pressed to slam 4, finally shutting off the flow of the working medium. In this case, the pointer 18 moves from the risks with the mark "O" at the risk with the mark "Hand." scale 19, the alarm switch 11 is triggered and gives a discrete signal that the gate 3 is in the CLOSED position, the light indication of the control station 12 turns on. When the medium pressure in the housing 1 reaches below the set value of the actuating pressure indicated on the scale 23, the pointer 18 moves with the risks with the mark "Man." at risk with a mark "З" of the scale 19.

When the pressure inside the housing 1 rises above the set value of the actuating pressure of the actuator indicated on the scale 24:

under the action of the increasing pressure in the cavity of the housing 1, the actuator rod 32, connected to the nut 33, overcoming the force of the compression spring 30 moves upward into the actuator cavity with atmospheric pressure, the axial movement of the rod 32 through the axis 35 is transferred to the lever 25, which, being on the axis 34, is stationary in the sleeve 40 converts the axial movement of the rod 32 into the longitudinal movement of the T-shaped part of the lever 25 (Fig. 7 (View D "with increasing pressure")),

the drive lever 25 comes out of engagement with the stop 26, releasing the slammer 4, which, under the action of its own weight and the medium flow, rotates on the axis 8 and is pressed against the end of the cover 2, blocking the flow of the transported medium and leaving only the discharge opening open;

in the housing 1 the pressure continues to increase (with a sharp increase in pressure behind the slammer 4), the drive lever 25 comes out of engagement with the fragment of the slammer body 5, which leads to its release by the drive, under the action of its own weight and the medium flow, the slammer 5 rotates on the axis 8 and is pressed to slam 4, finally shutting off the flow of the working medium. In this case, the indicator 18 moves from the risk with the mark "O" at the risk with the mark "З" of the scale 19, the alarm switch 11 is triggered and gives a discrete signal that the gate 3 is in the CLOSED position, the light indication of the control station 12 turns on.

When the medium pressure in the housing 1 reaches above the set value of the actuation pressure of the actuator indicated on the scale 24, the pointer 18 moves with the risks marked "Man." at risk with a mark "З" of the scale 19.

The shutter 3 is lifted after being triggered with a decrease / increase in pressure inside the body 1 after equalizing the pressure before and after the shutter 3 using the bypass valve 16, the handle 15 of the actuator is set to the MANUAL position, in which the levers of the actuator 25 and the stop 26 of the main flaps 4 are not located in the engagement zone (Fig. 9 "position 1"), after which the handle 7 of the bolt lifting unit 6 is pulled and rotated counterclockwise and is set in the STOP position, while the rotational motion of the handle 7 is transferred to the lever 41, on which the roller 42 is fixedly fixed, the roller comes into contact with the inclined surface of the bracket 43, fixed motionlessly on the main flap 4 (with a unlocking hole) and lifts the shutter 3 to a horizontal position (Fig. 8).

The design of the drive is made in such a way that when the STOP position of the handle 7 of the shutter lift assembly 6 and the transfer of the handle 15 of the drive from the position MANUAL. to the AVT position. the drive lever 25 and the stop 26 of the main slammer 4 engage (Fig. 9 "position 2").

By moving the handle 7 of the shutter lift assembly 6 to the AVT position. the process of preparing the valve to be ready for automatic operation is completed.

The shutter 3 is locked in the OPEN position by moving the actuator handle 15 to the STOP position, while the handle 7 of the shutter lifting unit 6 should be in the STOP position.

2. Operation of the device for CLOSING remotely - by a signal from the operator, by triggering an electromagnet 10.

In some cases, the maintenance personnel of electrified gas fields require a function to operate the shut-off valve remotely by the operator's signal "from the upper level", i.e. controlled operation in case of emergency increase / decrease of pressure in the housing and only by the operator's signal.

In the initial position, the compression springs 29, 30 of the mechanical drive do not have the ability to react and convert the compression forces when the pressure increases / decreases inside the body into the linear movement of the rod 32 since are fixed in the inner cavity of the sleeve 20, in turn, the sleeve 20 is fixed in a stationary state by the rod 21 through the side hole (Fig. 2). In this position, the actuation of the valve with an increase / decrease in pressure, as indicated in section 1 (actuation of the valve in automatic mode) is impossible due to the impossibility of transmitting the adjusted compression forces of the springs 29, 30 to the stem 32 of the mechanical actuator.

When the operator sends a signal to the device CLOSING on the electromagnet 10, the voltage is removed from the electromagnet 10, while the remote actuation mechanism of the drive is activated:

the core of the electromagnet during axial movement transmits a force to the L-shaped lever 27 of the blocking unit, which, in turn, being in engagement with the rod 21, removes it from the side hole of the sleeve 20 and removes the blocking of the mechanical drive (compression springs 29, 30 get freedom of compression and converting the axial movement during compression into a linear movement of the rod 32), the actuator releases the shutter 3, which, under the action of its own weight and the flow of the medium, rotates and closes the passage opening of the device (i.e., all subsequent actions occur as indicated in section 1);

the indicator 18 moves from the risk with the mark "O" at the risk with the mark "З" of the scale 19, the alarm switch 11 is triggered and gives a discrete signal that the gate 3 is in the CLOSED position, the light indication of the control station 12 turns on.

3. Local - manual (forced) operation of the device for CLOSING:

performed by turning the handle 15 of the drive to the MANUAL position, while the handle 7 of the shutter lifting unit 6 should be in the AVT position;

the actuator lever 25 disengages from the stop 26, releasing the shutter 3, which, under the action of its own weight and the flow of the medium, rotates and closes the passage opening of the device;

pointer 18 moves from the risks with the mark "O" at the risk with the mark "Man." scale 19, the signaling switch 11 is triggered and gives a discrete signal that the gate 3 is in the CLOSED position, the light indication of the control station 12 turns on.

4. Emergency - in the event of a power outage, the device operates to CLOSE in automatic mode:

is performed by triggering the electromagnet 10 (similar to section 2 - triggering the device on the operator's signal):

when the power is cut off (lack of electricity), the voltage is removed from the electromagnet 10, while the remote actuation mechanism of the drive is activated and the drive releases the shutter 3, which, under the action of its own weight and the flow of the medium, turns and closes the through hole of the device.

The main features of the proposed slam-shut valve are that the slam-shut valve contains an actuator capable of operating:

in automatic mode, in case of emergency increase or decrease of pressure in it, with light indication of the control station;

remotely at the operator's signal, with light indication of the control station;

in manual (forced) mode, with light indication of the control station;

emergency, in the event of a power outage at the facility of its installation.

The shut-off valve has a built-in design of the bypass valve 16. The connection of the inlet of the housing 1 and the outlet of the cover 2 when equalizing the pressure before and after the shutter after the valve is triggered occurs through the internal channels "B" in the body 1 and "D" in the cover 2 (Fig. 3) when opening the bypass valve 16.

The design of the built-in valve eliminates the need for external piping elements, which, at high pressure drops at the inlet and outlet of the slam-shut valve, are frozen after the valve is activated and the pressure is equalized before and after the valve.

Claims (6)

1. A shut-off valve, comprising: 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 element, characterized in that a shutter is used as a shut-off element, consisting of a main slam with a discharge opening and an additional a deaf slam, made with the ability to close the unloading hole of a deaf slam, the mechanical drive includes: a compression spring, an extension spring, a rod and a lever connected to the rod, the mechanical drive is designed in such a way that when the pressure inside the device body drops above the adjusted, the extension spring shifts the rod, which in turn, turns the lever, first disengaging from the main slam stop, and thereby releasing the main slam, which, under the influence of its own weight and the flow of the medium, turns and restricts the flow, and then disengages from the deaf slam stop, and thereby freeing the deaf scum pku, which, under the action of its own weight and the flow of the medium, turns and completely blocks the flow, and when the pressure inside the body of the device is higher than the adjusted one, the rod, overcoming the force of the compression spring, turns the lever associated with it, first disengaging from the stop of the main slam, and thereby releasing the main slam, which, under the action of its own weight and the flow of the medium, turns and restricts the flow, and then the deaf slam that comes out of engagement with the stop, and thereby releases the deaf slam, which, under the influence of its own weight and the flow of the medium, turns and completely blocks the flow, in addition, the device includes a mechanism for remote actuation of the drive, which includes an electromagnet, an L-shaped lever and a rod, where the electromagnet is configured to control an L-shaped lever associated with the rod that controls the rod of the mechanical drive, as well as a shutter lifting unit, including a handle associated with the lever m, lifting and fixing the shutter. 2. The shut-off valve according to claim 1, characterized in that it further comprises a scale for setting the valve response limits when the pressure decreases and a scale for setting the valve response limits when the pressure rises. 3. The shut-off valve according to claim 1, characterized in that it further comprises a bypass valve to equalize the pressure of the medium before and after the shutter. 4. The shut-off valve according to claim 1, characterized in that it further comprises a handle allowing manual movement of the shut-off element, opening the outlet channel. 5. The shut-off valve according to claim 1, characterized in that it contains a handle that allows manual movement of the shut-off element, forcibly closing the outlet channel. 6. The shut-off valve according to claim 1, further comprising a light indication showing the position of the shutter.

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