SU1740841A1 - Shut-off-control device - Google Patents

Abstract

Use: for installation on natural gas pipelines for flow control and automatic shut-off of the pipeline during an emergency increase and pressure drop in it. SUMMARY OF THE INVENTION: A flat gate with sealing surfaces and a hole is connected by a drive rod. A rotary valve in the form of a flap is associated with a locking mechanism. The bracket and the sensing element are located on the housing. The element is made in the form of a spring-loaded rod with a protrusion on the end. The fixation mechanism is made in the form of stops, one of which is mounted on the valve perpendicular to it. The emphasis is placed on the bracket with the possibility of rotation and is made with a groove. 4 il.

Description

The invention relates to pipeline valves for the gas industry and is intended for installation on natural gas pipelines for controlling gas flow and automatically shutting off a pipeline when an emergency pressure rises and falls.

The purpose of the invention is to increase the reliability due to the automatic shut-off of the gate with sudden pressure drops.

FIG. 1 shows the device in the open position, a longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 “section BB in FIG. one; FIG. 4 is a sectional view BB in FIG. 3

The device includes a housing 1 with a passageway 2. In the housing 1 coaxially with the passage passage 2, there is a fixed seat 3 with an opening 4 and a sealing element 5. In the seat 3, between the guides 6, there is installed a flat gate 7 with sealing surfaces 8 and 9 and a hole 10, an insert 11 with a hole 12 and a sealing element 13, sealing the sealing surface 9 of the gate 7 and the seat 3 over the entire adjustment range. The gate 7 is connected with the rod 14 of the actuator 15 On the gate 7 in the area of the hole 10 on the axis 16 located in the bracket 17, a rotary closure body 18 of a flap type with a sealing element 19 is installed.

The locking member 18 is connected with the locking mechanism in the open position, wherein the locking mechanism is an anvil, one of which (the anvil 20) is installed perpendicular to the axis 16 of the locking member 18, and the anvil 21 is positioned radially 20 on the bracket axis 22 23 with the possibility of rotation. On the stop 21 is made a groove 24.

In the housing 1 parallel to the movement of the gate 7 there is a sensitive element 25, made in the form of a rod 27 loaded with a spring 26, on the end surface of which there is a protrusion 28. cooperating with the groove 24 of the stop 21.

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The housing 1 also houses the mechanism 29 for returning the pivoting valve 18 to the open position and mechanism 30 for returning the stop 21 to the position of locking the valve 18 in the open position.

The device works as follows.

If it is necessary to control the flow rate of the passing medium, for example gas. serves the appropriate signal to the actuator 15, which begins to move the rod 14 up. The latter moves the flat gate 7 with the liner 11 relative to the seat 3. As a result, the hole 4 and the seat 3 partially overlap with the gate 7, and the gas flow is controlled. At the same time, the rotatable locking member 18 moves together with the gate 7. And its stop 20 slides along the stop 21, keeping the locking member 18 in the open position. The stop-21, in turn, is held in the radial position by the protrusion 28 of the rod 27.

With increasing pressure in the device case 1, the rod 27 is pushed outward, overcoming the force of the spring 26, and releases the stop 21, which, under its own weight, rotates on the axis 22 and releases the stop 20 of the shut-off member 18. The latter rotates on the axis 16. 7 and closes the hole 10. stopping the subsrill of gas.

When the pressure in the device case 1 decreases, the force of the spring 26 overcomes the pushing force of the rod 27 and moves the latter inside the case 1. The protrusion 28 of the rod 27 is aligned with the groove 24 of the stop 21 and releases the stop 21, which under its own weight turns on the stop valve organ 18. The latter rotates on the axis 16, lowers onto the sealing surface 8 of the gate 7 and closes the opening 10. stopping the gas supply.

If necessary, shut off the gas flow serves the maximum signal to the actuator 15. A rod 14 of which moves the gate 7 to its extreme position. With

This flat gate 7 in the final position completely closes the opening 4 in the saddle 3. stopping the flow of gas. The pressure in the device case 1 rises to the maximum possible, i.e. static, pressure, while the rod 27 is pushed out, overcoming the force of the spring 26, and releases the stop 21, which under its own weight rotates on the axis 22 and releases the stop 20 of the valve 18 .

The latter rotates on axis 16. lowers on the sealing surface 8 of the gate 7 and closes the opening 10. stopping the gas supply.

The opening of the rotary closure member 18 and the return of the stop 21 to the locking position of the closure member 18 in the open position is carried out manually by the mechanisms 29 and 30.

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Claims (1)

Invention Formula The locking and regulating device containing the case with the channel through passage, a saddle, a flat gate with sealing surfaces and a hole connected by a rod to the drive; a rotary valve in the form of a flap associated with a locking mechanism characterized in that. that, in order to increase reliability due to automatic shut-off of the shutter at sudden pressure drops, the device is equipped with a bracket and a sensor element placed on the body, while the sensor element is made in a spring-loaded rod with a protrusion on the end, and the fixation mechanism is made in the form of stops, one of which is mounted perpendicular to it on the valve, and the other is placed on the bracket with the possibility of rotation and made with a groove. SL Aa 21 Fig 2 27 28 24 22 23 I 20 thirty FIG.