RU229949U1 - BLOCK OF LOCKING DEVICES - Google Patents

Abstract

The utility model relates to the field of mechanical engineering, in particular to valve engineering, namely to blocks of shut-off devices, and can be used in the oil and gas production industry. The technical task of the utility model is to create a block of shut-off devices with guaranteed tightness according to class A of GOST 9544-2015, with visual leakage control. The task is achieved in that the block of shut-off devices, containing a wedge gate valve with a manual drive, with a check valve with a flap located in the channel of the housing, between the wedge gate valve and the check valve a controlled shut-off device is installed coaxially, and a pressure gauge is installed on the housing of the shut-off device, and a tray is fixed on its lower tie rods, while the shutter of the wedge gate valve is made with self-adjusting seats along the wedge with their subsequent fixing, and the check valve is installed in the outlet channel after the shut-off device and is made in the form of a spring-loaded axial flow plate or in the form of a ball valve.

Description

The utility model relates to the field of mechanical engineering, in particular to valve engineering, namely to shut-off device units, and can be used in the oil and gas production industry.

A block of pressure-reducing devices is known (see RU 182450 01 F16K 3/312), consisting of a frame on which two or four branches are mounted, each containing two sequentially connected shut-off and control devices with pressure gauges located on the input and output branches.

The disadvantages of the known device include the lack of control over the presence of leaks that do not affect the sensitivity of the pressure gauge through the valve of both series-connected shut-off and control devices, which does not guarantee compliance with the requirements of GOST 9544-2015 (class A)

Also known is a multifunctional unit (see RU 2451855 C2 F16K 3/02) (prototype), consisting of a manually operated wedge gate valve in the outlet or inlet branch pipe, on which a check valve (flap) is installed. When the working medium flows back, the check valve closes, protecting not only the wedge gate valve from back pressure, but also the process equipment mounted on this pipeline up to the multifunctional unit.

The disadvantages of this unit also include the lack of control over the presence of leaks in the wedge gate valve and the lack of control over the pressure of the working medium between the wedge gate valve and the closed check valve.

The technical task solved by this utility model is the creation of a block of shut-off devices with guaranteed tightness according to class A of GOST 9544-2015, with visual control of leaks.

The task is achieved in that the block of shut-off devices, containing a wedge gate valve with a manual drive, with a check valve located in the channel of the housing, between the wedge gate valve and the check valve a controlled shut-off device is installed coaxially, under the gate of which a tray is fixed on the lower tie rods, made in the form of a rectangle with sides and an open top, a pressure gauge is installed on the housing of the shut-off device, the wedge gate valve is made with self-adjusting seats along the wedge with their subsequent fixing, the check valve is made in the form of a spring-loaded axial flow plate, the check valve is made in the form of a ball valve, the check valve is made in the form of a flap.

Fig. 1 shows a longitudinal section of the block of locking devices;

Fig. 2 - top view of the block of locking devices;

in Fig. 3 - view along arrow A in Fig. 1;

in Fig. 4 - callout I (variant) in Fig. 1;

in Fig. 5 - callout I (variant) in Fig. 1.

The block of shut-off devices consists of a wedge gate valve body 1 with an input channel 2 and an output channel 3. The wedge 4, controlled by a manual drive 5, interacts on both sides with self-adjusting seats 6 along the wedge 4, fixed in the body. The output channel 3 of the body 1 is coaxial with the channel of the body 7 of the shut-off device, on the outer diameter of the channel there is a slider 8, controlled by a drive 9 and interacting with a gate 11 moved behind a handle 10, equipped with two sealing disks 12 and 13 with an opening equal to the diameter of the output channel 3 of the body 1. Both disks 12 and 13 are equipped with double-sided grooves with sealing elements 14 made of elastomeric material placed in them.

The body 7 is connected to the body 1 by four tie rods 15, a tray 16 is secured to the lower rods 15, and a pressure gauge 17 is installed in the upper part of the body 7. A check valve 18 is installed in the outlet part of the through channel of the body 7. The check valve can be made in the form of an axial plate or in the form of a ball valve. On both sides of the block, connecting flanges 19 are installed to the body of the gate valve 1 and 20 to the body of the shut-off device 7. On both sides, the gate valve 11 is closed by a curtain 21. A drain cock 22 is installed to drain the working medium from the internal cavities of the body 7.

Operation of the locking device block in the "open" mode.

In this case, the wedge 4 of the wedge gate valve is in the upper position, and a disk 13 with an opening with a diameter equal to the diameter of the input and output channels of the body 1 is installed coaxially with the output channel 3 of the body 1.

The working medium through channels 2, 3 of disk 13 and body 7 opens the gate of check valve 18 and enters through flange channel 20 to the consumer.

Operation of the locking device block in the "closed" mode.

In this case, the wedge 4 of the wedge gate valve interacts with the seats 6 on both sides, respectively. And due to the fact that the seats are made self-adjusting in relation to the wedge, which eliminates all permissible errors in the implementation of sealing fields by the angle of inclination in the horizontal and vertical axes, the maximum possible areas of interaction of the sealing fields of the wedge and the seats are achieved. By opening the valve 22, we drain the working medium from the body 7.

Using handles 10, we move the gate 11, blocking the coaxial channel of housings 1 and 7 with a solid disk 12, and using drive 9, we seal it with slider 8. In this case, check valve 18 is closed from the pressure of the reverse flow.

The tightness of the locking device block after closing is checked as follows:

There is no numerical value of the working medium pressure on the pressure gauge 17. But, since all pressure gauges operating from an elastic element have a certain sensitivity, then drip leaks along the shutter will not be reflected on its scale.

The sensitivity of a pressure gauge is understood to be the value that forms the ratio of the increment in the displacement of a certain point of the elastic element of the device to the increment in the applied pressure." GOST 9544-2015 defines the tightness standard of valves as "the absence of visible leaks."

Since the pressure gauge in this case does not determine the tightness standard of the block, a tray 16 is installed on the lower studs 15, made in the form of a rectangle with sides and an open top located under the valve 11.

If the gate valve has leaks and the pressure of the working medium acts on the disk 12 of the gate 11, equipped with a sealing element made of elastomer material, then if this seal is not tight, drops of the working medium will fall into the tray, and such a leak is already visually visible.

The absence of such indicates that the block of shut-off devices with a sealing degree according to class A of GOST 9544-2015 closes the pipeline.

The role of the check valve

In case of residual pressure of the backflow of the working medium, the check valve closes the flow channel of the body 7 from the back pressure of the working medium.

Thus, due to the fact that the wedge gate with self-adjusting seats, the controlled shut-off device and the check valve are sequentially coaxially connected in the order of the working medium passage, a hermetic shut-off of pressure pipelines according to class A of GOST 9544-2015 is guaranteed with visual monitoring of leaks in the tray installed under the gate of the controlled shut-off device.

Claims (6)

1. A block of shut-off devices containing a manually operated wedge gate valve with a check valve located in the housing channel, characterized in that a controlled shut-off device is installed coaxially between the wedge gate valve and the check valve, under the gate of which a tray is secured on the lower tie rods, made in the form of a rectangle with sides and an open top. 2. A block of shut-off devices according to item 1, characterized in that a pressure gauge is installed on the body of the shut-off device. 3. A block of shut-off devices according to item 1, characterized in that the wedge gate valve shutter is made with self-adjusting seats along the wedge with their subsequent fastening. 4. A block of shut-off devices according to item 1, characterized in that the check valve is made in the form of a spring-loaded axial flow plate. 5. A block of shut-off devices according to item 4, characterized in that the check valve is made in the form of a ball valve. 6. A block of shut-off devices according to item 1, characterized in that the check valve is made in the form of a flap.