RU2473061C1 - Shutoff separating device for pressure gauges - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: shutoff separating device for pressure gauges includes housing (1) with the first (2) and the second (3) chambers, with nozzles (10) for connection of the device to the pipeline and for connection of working pressure gauge. Valves (4), the movement of which is controlled with flywheels (5), are installed in chambers. The first pair of mutually perpendicular holes (12) attaches the pipeline cavity and the first chamber. The second pair of mutually perpendicular holes (13) attaches the first chamber and working pressure gauge. In housing there is an inclined hole (14) at an angle of 20° to the housing axis, which attaches the second pair of mutually perpendicular holes and the second chamber. One of the holes of the first pair of mutually perpendicular holes and inclined hole are passages in seats of valves. In the housing there is a threaded hole for connection of a test pressure gauge or gauge of working medium discharge from the device. Threaded hole is connected to the second chamber.

EFFECT: design of reliable shutoff separating device excluding the penetration of working medium to atmosphere.

4 dwg

Description

The invention relates to the field of mechanical engineering, namely to valve engineering, and is intended as a locking-isolating device (valve) for connecting control and measuring devices (manometers) installed on pipelines.

Known three-way steel valve for pressure gauge KM 1.00 (ZAO "AMAKS-gas", www.s-gaza.ru/catalogue/armature/tap/037), adopted as a prototype for the invention. The specified valve is intended for installation on pipelines transporting natural gas, liquid and vapor phases of liquefied petroleum gases as a shut-off device in front of instrumentation. The known valve comprises a housing with first and second chambers. In chambers with the ability to move installed rods. Each rod has a seal and a groove for the sealing ring. The casing is made of saddles in the form of annular protrusions. The movement of the rods in the chambers is carried out by rotating the flywheels interacting with the rods. The housing has a union with union nuts for attaching the device to the pipeline and instrumentation. A threaded hole is made in the housing for connection through a transition fitting of a control pressure gauge or discharge of a working medium. The axes of the first and second chambers coincide with the first (main) axis of the housing. The axes of the two fittings coincide with the second axis of the housing. Two pairs of mutually perpendicular openings are made in the valve body, and a hole connecting the second chamber to the threaded hole, the first pair of mutually perpendicular openings connects the pipe cavity and the first chamber, and the second pair of mutually perpendicular openings connects the first chamber, operating pressure gauge and second chamber.

Typically, in known shut-off devices, the medium is supplied under the valve seat.

In the known three-way steel valve for the KM 1.00 pressure gauge, the axis of the hole connecting the pipe cavity and the first chamber is offset relative to the axis of passage of the seat. Therefore, the working medium is supplied to the valve. Over time, the sealing ring, which prevents the passage of the working medium from the first chamber into the atmosphere, may fail and then the working medium will leak, the elimination of which will be difficult.

The objective of the invention is to develop a reliable device locking and separating, eliminating the penetration of the working medium into the atmosphere.

The technical result is achieved by the fact that the locking and separating device for manometers contains a housing with a first and second chambers, the axes of which coincide with the first axis of the housing. In the chambers with the ability to move installed valves with grooves. The housing has a fitting with a nut for attaching the device to the pipeline and a fitting with a nut for attaching a working pressure gauge. The axis of the fittings coincide with the second axis of the housing. A threaded hole is made in the housing for connecting a control pressure gauge or dumping a working medium from a control pressure gauge. The housing has saddles in the form of annular protrusions in the first and second chambers. Two flywheels, each of which has an eccentric hole on the end surface, are screwed onto the body so that during rotational movement each flywheel interacts with the groove of the corresponding valve to ensure the forward movement of the valve in the chamber. A hole is made in the housing connecting the second chamber with a threaded hole. Two pairs of mutually perpendicular holes are made in the housing, the first pair of mutually perpendicular holes connecting the pipe cavity and the first chamber, and the second pair of mutually perpendicular holes connecting the first chamber and the working pressure gauge. The axis of the first pair of mutually perpendicular holes coincide with the first and second axes of the housing. Moreover, one of the holes of the first pair of mutually perpendicular holes, in contrast to the prototype, is a passage in the saddle in the first chamber. The axis of one of the holes of the second pair of mutually perpendicular holes is parallel to the first axis of the housing and is located outside the saddle zone in the first chamber. An inclined hole is made in the housing at an angle of 20 ° to the first axis of the housing, connecting the second pair of mutually perpendicular holes and the second chamber.

An example implementation of the proposed device is illustrated in Fig 1-4.

Figure 1 shows the main view (in section) of the locking and separating device for pressure gauges.

Figure 2 presents the left side view of the locking and separating device for pressure gauges.

Figure 3 presents a top view (in section) of a locking and separating device for manometers.

Figure 4 presents the marking of the housing of the device.

The locking and separating device for manometers (hereinafter the device) contains:

1 - housing;

2 - the first camera;

3 - the second camera;

4 - valve;

5 - flywheel;

6 - sealing element;

7 - ring;

8 - screw;

9 - an eccentric hole in the flywheel;

10 - fitting;

11 - flare nut;

12 - the first pair of mutually perpendicular holes;

13 - the second pair of mutually perpendicular holes;

14 - an inclined hole connecting the second pair of mutually perpendicular holes and the second chamber;

15 - threaded hole;

16 - cork;

17 - a sealing ring;

18 - hole connecting the threaded hole and the second chamber;

19 - product labeling.

In the housing 1 there are two symmetrical chambers 2 and 3, the axes of which coincide with the first (main) axis of the housing (for example, the x axis). In the first chamber 2 and the second chamber 3, valves 4 are arranged to move. Each valve has a groove for interacting with the flywheel 5, a sealing element 6 and a groove for the ring 7, designed to seal the gap between the valves and the chambers. The saddles are made in the body and have the form of an annular protrusion of a triangular profile. When closing the valves, the seats are pressed into the sealing elements 6. The movement of the valves is carried out by manually rotating the handwheels 5, transmitting the movement to the valves 4. The handwheels 5 are screwed onto the housing 1 and are fixed with screws 8, preventing their complete unscrewing. On the end surface of each flywheel, an eccentric hole 9 is made for contact with the valve.

The housing has two fittings 10 with union nuts 11 located symmetrically relative to each other. The axis of the fittings coincides with the second axis of the housing (for example, the y axis). The second axis of the housing is perpendicular to the first axis of the housing and intersects it. One fitting with a nut is used to connect the device to the pipeline, and the other fitting with a nut is used to connect a working pressure gauge.

The following holes are made in the housing:

- the first pair of mutually perpendicular holes 12 connecting the first chamber 2 and the cavity of the pipeline. In this case, the axis of one hole of the first pair coincides with the second axis of the housing (y axis). Another hole of the first pair is the passage in the saddle in the first chamber 2, and its axis coincides with the first axis of the housing (x axis);

- a second pair of mutually perpendicular holes 13 connecting the first chamber 2 and the working pressure gauge. The axis of one of the holes coincides with the second axis of the casing (y axis), and the axis of the other holes are parallel to the first axis of the casing (x axis) and located outside the saddle zone in the first chamber 2;

- an inclined hole 14 connecting the second pair of mutually perpendicular holes 13 and the second chamber 3 and located at an angle of 20 ° to the first axis of the housing (x axis). The inclined hole 14 is a passage in the saddle in the second chamber 3;

- a threaded hole 15, which serves to discharge the working medium or to connect a control pressure gauge. The threaded hole 15 is plugged with a plug 16 with a seal 17. In the plug 16 holes (not shown) are made to discharge the working medium from the working pressure gauge;

- the hole 18 connecting the second chamber 3 and the threaded hole 15. The axis of the hole 18 is parallel to and offset from the first housing axis (x axis).

The manufacturer’s designations and product parameters 19 are applied to the device case.

The control pressure gauge is fixed directly to the device body or through transition devices (for example, through a transition fitting). To do this, remove the plug 16, covering the threaded hole 15.

The locking device for pressure gauges works as follows.

The device is connected using fittings 10 with union nuts 11 to the pipeline and instrumentation (pressure gauge). In the initial position, the aisles in the seats are closed by sealing elements 6 of the valves 4. This ensures the tightness of the device, in which the working medium from the pipeline does not enter the first and second chambers of the device.

To measure the pressure of the working medium with a working pressure gauge, the first flywheel is rotated counterclockwise. In this case, the valve in the first chamber 2 moves and opens the passage in the saddle (the passage in the saddle in the second chamber 3 remains closed). The pipeline cavity communicates with the working pressure gauge through the first pair of mutually perpendicular openings 12, the first chamber 2 and the second pair of mutually perpendicular openings 13.

To check the operability of the working pressure gauge (setting the pressure gauge to “zero”), close the passage in the saddle in the first chamber 2 (by rotating the corresponding flywheel clockwise) and open the passage in the saddle in the second chamber 3 (rotate the corresponding flywheel counterclockwise). Unscrew the plug 16 closing the threaded hole 15 by one or two turns. The working medium from the working pressure gauge is discharged through openings (not shown) made in the plug. After that, the needle of the pressure gauge should be set to “zero”.

To verify the accuracy of the measurement of the working pressure gauge remove the plug 16 and attach to the threaded hole 15 of the control pressure gauge. The openings of both saddles are opened (by corresponding rotation of the handwheels). In this case, the working pressure gauge is connected to the pipeline cavity through the first pair of mutually perpendicular holes 12, the first chamber 2 and the second pair of mutually perpendicular holes 13. The control pressure gauge is connected to the pipeline cavity through the first pair of mutually perpendicular holes 12, the first chamber 2, the second pair of mutually perpendicular holes 13, the inclined hole 14, the second chamber 3, the hole 18 and the threaded hole 15. The readings of the working pressure gauge and the reference pressure gauge are checked. With proper operation, the pressure gauges should be the same.

The locking and separating device for pressure gauges allows you to replace the control and measuring device without shutting off the working medium in the pipeline.

Claims (1)

The locking and separating device for manometers, comprising a housing with first and second chambers, with a fitting for connecting the device to the pipeline, with a fitting for connecting a working pressure gauge, with a threaded hole for connecting a control pressure gauge or dumping the working medium from the working pressure gauge, with seats in the first and the second chambers, while in the chambers valves with grooves are installed, the axes of the first and second chambers coincide with the first axis of the casing, and the axes of two fittings coincide with the second axis of the casing, two flywheels, each rykh has an eccentric hole on the end surface and is screwed onto the body so that when the flywheel rotates, it interacts with the valve groove to ensure the valve moves in the chamber, two pairs of mutually perpendicular holes made in the body, and a hole connecting the second chamber to the threaded hole wherein the first pair of mutually perpendicular holes connects the pipe cavity and the first chamber, and the second pair of mutually perpendicular holes connects the first chamber and the working pressure gauge, characterized in that an inclined hole is made in the housing at an angle of 20 ° to the first axis of the housing, connecting the second pair of mutually perpendicular holes and the second chamber, the axes of the first pair of mutually perpendicular holes coincide with the first and second axes of the housing, one of the holes of the first a pair of mutually perpendicular holes is a passage in the saddle in the first chamber, the axis of one of the holes of the second pair of mutually perpendicular holes is parallel to the first axis of the housing and is located outside the saddle zone in the first chamber .

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