RU130656U1 - SAFETY VALVE UNIT SWITCHING DEVICE - Google Patents

Abstract

1. The switching device of the safety valve block, comprising a housing with one input channel and two coaxially made output channels having saddles in their bores, and between the saddles and coaxially there is a two-way valve formed from a stem and kinematically connected with it and coaxially located relative to it two two-way valves with corresponding slide valves, the stem being driven by a drive, through one-way valves have through discharge channels, to close to There are two movable spring-loaded locking elements on the stem located coaxially to the stem, characterized in that each one-way shutter is placed and fixed in a guide located in the bore of each output channel, inside of which a saddle is formed, each through discharge channel is formed from an axial discharge channel made in the top of the spool of each one-way shutter, and the through channels associated with it, made in the body of each one-way shutter at an angle to its axis, the rod It is collapsible and is formed of two symmetrically located rods connected by a sleeve and fixed in it, while the sleeve is equipped with a drive transmission device, the part free from the sleeve of each of these rods is made integrally with a spring-loaded locking element and is fixed inside corresponding one-way shutter with the possibility (as a result of its movement) of blocking the axial discharge channel and moving the one-way shutter in the direction of opening / closing

Description

This utility model relates to a technique for transporting gas or liquids and can be used for installation on pipelines as part of pressure relief valve blocks.

It is known "Switching device of the safety valve block" (patent for the invention of the Russian Federation 2134832, IPC F16K 11/10, publ. 08/20/1999), containing a housing with an input channel and two output channels having coaxially located saddles. Between the saddles and coaxially there is a double-acting shutter with gaskets, discharge channels and supporting ends (spools), and a rod interacting with it, kinematically connected to a screw drive with a flywheel located outside the housing of the switching device. At the same time, a double-acting shutter is located on the stem and forms a console with it, abutting against the housing by the part free from the shutter. Each of the output channels is connected to the inlet of the safety valve. Moreover, the shutter is mounted on the rod with the possibility of axial movement, which is limited by the emphasis made on the rod. End-to-end unloading channels are made on different sides of the shutter, two on each side of the rod and at the same distance from it. To overlap these channels, the valve is equipped with two spring-loaded locking elements located on different sides of the valve and mounted on the rod and aligned with it and moved by the rod stop in the direction of opening / closing of the corresponding discharge channels. The effective area of the inlet valves of the locking element is less than the effective area of the shutter, and the contacting surfaces of the shutter and seat are made conical.

This known switching device of the safety valve block is selected as a prototype, since it has the largest number of essential features that match the essential features of the claimed utility model.

However, this prototype has significant disadvantages, namely:

- restriction of permissible pressure in the line due to the large area of the spring-loaded locking elements, since at high pressure considerable efforts will be required to switch them;

- it is difficult to ensure the required tightness of the device due to the high probability of inaccurate installation of the shutter inside the device due to the cantilever location of the shutter on the rod;

- there is a risk of personal injury when dismantling the safety valve due to the lack of a pressure relief device to the valve.

The objective of this utility model is to create a new switching device for the safety valve block with the following technical result: increasing the functionality of the switching device by expanding the range of operating pressures and temperatures while simplifying its manufacture and assembly, as well as ensuring safety during the dismantling of safety valves.

The problem is solved due to the fact that:

- each one-way shutter is placed and fixed in the guide located in the bore of each output channel, inside which a saddle is formed;

- each through discharge channel is formed of an axial discharge channel, made at the top of the spool of each one-way valve, and associated through channels, made in the body of each one-way valve at an angle to its axis;

- the rod is made collapsible and formed of two symmetrically located rods connected by a sleeve and fixed in it, while the sleeve is equipped with a device for transmitting movement from the drive;

- the sleeve-free part of each of these rods is made integrally with a spring-loaded locking element and fixed inside the corresponding one-way lock, with the possibility (as a result of its movement) of closing the axial discharge channel and moving the one-way valve towards the opening / closing of the corresponding output channel;

- through holes are made in the guide in front of the saddle, which are arranged to interact with through channels formed in each one-way shutter.

The essence of the claimed technical solution lies in the fact that in the switching device of the safety valve block, comprising a housing with one input channel and two coaxially made output channels having saddles in their bores, there is a two-way valve formed between the seats and coaxially formed from the stem and kinematically connected with it and coaxially arranged with respect to it, two one-way valves having respective spools, while the rod is driven by a drive, and in one-way with shutters, through discharge channels are made, for overlapping of which there are two movable spring-loaded locking elements located on the stem coaxially with the rod, according to the present utility model, each one-way shutter is placed and fixed in a guide located in the bore of each output channel, inside of which a saddle is formed, each through the discharge channel is formed from an axial discharge channel, made at the top of the spool of each one-way valve, and through channels associated with it, in made in the housing of each one-way shutter at an angle to its axis, the stem is collapsible and formed of two symmetrically located rods connected by a sleeve and fixed in it, while the sleeve is equipped with a drive transmission device from the drive, and a part free from the sleeve of each of these rods is made integrally with a spring-loaded locking element and fixed inside the corresponding one-way lock, with the possibility (as a result of its movement) of blocking the axial unloading Channel sided shutter and moving in the direction of the opening / closing of the corresponding output channel, the front in the guide seat is provided with through openings arranged to cooperate with the through channels formed in each one-way gate.

A development option for the main technical one is possible, consisting in the fact that the device for transmitting movement from the drive to the sleeve is formed from a fork installed in the middle of the sleeve and having the ability to rotate a certain angle around the axis, while the fork is mounted on a shaft driven by the drive.

There is another option for the development of the main technical, consisting in the fact that the drive is made in the form of a handle with a latch having three mounting positions.

There is another option for the development of the main technical, consisting in the fact that the output channels are equipped with a pressure relief device.

Thus, the claimed technical solution with its entire set of essential features allows to increase the functionality of the switching device by expanding the range of operating pressures and temperatures by providing the possibility of gradual pressure relief, since when working with a two-sided shutter, considerable effort is required, due to the implementation of through unloading in each one-way shutter channels of arbitrarily small diameter, consisting of an axial discharge channel and through channels. Simultaneously with the increase in functionality, simplification of the manufacturing and assembly and adjustment process of the switching device is achieved by performing a two-way shutter and the collapsible stem interacting with it and a fixed arrangement of each one-way shutter in the corresponding guide. The guides provide a rectilinear movement of the one-way valve, excluding its rotation about the axis, and thereby ensuring the stability of the tightness of the seal due to the snug fit of the valve of the one-way valve to the seat. In addition, the inventive device is technologically advanced in manufacture, processing of hull and individual parts does not require specialized equipment. For sealing, standardized elements are used. Ensuring tightness is achieved by traditional methods (grinding).

Due to the presence of a pressure relief device, safety is ensured during the dismantling of safety valves, since it allows you to gradually reduce the pressure in the outlet channels under the safety valves.

The essence of the claimed utility model and the possibility of its practical implementation is illustrated by the description and drawings below.

Figure 1 - Block safety valves.

Figure 2 - The switching device of the safety valve block (closed right spool and right spring-loaded locking element).

Figure 3 - The switching device of the safety valve block (open right spring-loaded locking element).

1 - safety valve;

2 - switching device;

3 - case;

4 - input channel;

5 - output channel;

6 - guide;

7 - double-sided shutter;

8 - stock;

9 - one-way shutter;

10 - drive;

11 - pin;

12 - spool;

13 - axial discharge channel;

14 - through channel;

15 - stock;

16 - stock;

17 - sleeve;

18 - pin;

19 is a motion transmission device;

20 - spring-loaded locking element;

21 - a pin;

22 - through hole;

23 - fork;

24 - shaft;

25 - handle;

26 - a clamp;

27 is a pressure relief device.

The safety valve block (Figure 1) contains two safety valves 1 and a switching device 2.

The switching device 2 of the safety valve block 1 (FIGS. 2, 3) consists of a housing 3 through which the working medium passes. In the housing 3 there is one input channel 4, through which the working medium is supplied, and two coaxially located output channels 5, each of which is connected to the corresponding safety valve 1.

A guide 6 is located in the bore of each output channel 5, inside of which a saddle is formed (conventionally shown in the drawing).

Between the saddles formed in the bores of the output channels 5 (conventionally shown in the drawing) and coaxially located there is a bilateral shutter 7, which consists of a rod 8 and two kinematically connected with the rod 8 and one-way shutters 9 coaxially located relative to it. In this case, the rod 8 is driven drive 10.

Each one-way shutter 9 is placed and fixed in the guide 6 using the pin 11.

Each one-way valve 9 has a spool 12 in contact with the said seat (conventionally shown in the drawing), and in the case of each one-way valve 9 there are through unloading channels, each of which is formed from an axial unloading channel 13, made at the top of the spool 12, and associated with through channels 14 made at an angle to the axis of the one-way shutter 9 and connecting the internal cavity of the housing 3 with the axial unloading channel 13.

The rod 8 is made collapsible and formed of two symmetrically located rods 15 and 16, connected by a sleeve 17 and fixed in it with pins 18, while the sleeve 17 is equipped with a device 19 for transmitting movement from the drive 10.

The free part of the sleeve 17 of each of the rods 15 and 16 is made in the form of a spring-loaded locking element 20 and is fixed with a pin 21 inside the corresponding one-way valve 9, with the possibility (as a result of its movement) of blocking the axial discharge channel 13 and moving the one-way valve 9 to the side opening / closing of the corresponding output channel 5. In this case, the pins 21 have a small free play to ensure that the locking element 20 is preloaded by springs (conventionally shown in the drawing).

Through the guide 6 in front of the formed seat is made through holes 22 located with the possibility of interaction with through channels 14 formed in each one-way shutter 9.

The device 19 for transmitting movement from the drive 10 to the sleeve 17 can be formed from a plug 23 mounted in the middle of the sleeve 17 and having the ability to rotate a certain angle around the axis, while the plug 23 is fixed to the shaft 24, driven by the drive 10.

The actuator 10 can be made in the form of a handle 25 with a latch 26 having three mounting positions: top (left and right spools 12 open and spring-loaded locking elements 20 — both safety valves 1 are in operation), rightmost (right spool 12 and spring-loaded are closed shut-off element 20 - the left safety valve 1 is in operation), the leftmost valve (the left spool 12 is closed and the spring-loaded shut-off element 20 - the right safety valve 1 is in operation).

The output channels 5 may be provided with a pressure relief device 27, for example, a pressure relief screw may be used.

Each spool 12 has a diameter sufficient to ensure the required flow rate of the working medium, and thanks to the presence of the pin 11, its rotation relative to the seat is excluded, which ensures the stability of the tightness of the seal.

The spring-loaded locking elements 20 have a significantly smaller diameter than the spools 12 to reduce the force exerted on the handle 25 of the actuator 10 when they are opened.

The spring-loaded locking elements 20 have two grooves that allow them to move inside the one-way shutter 9 from the stop to its sealing surfaces (conventionally shown in the drawing), until it stops in the pins 21, while the presence of the pins 21 precludes the rotation of the spring-loaded shutter elements 20 inside the one-way shutters 9.

To ensure joint movement, the spring-loaded locking elements 20 and one-way valves 9 are interconnected via a sleeve 17 with pins 18 having a small free stroke to ensure that the locking elements 20 are pressed by springs (conventionally shown in the drawing).

The inventive switching device block safety valves is used as follows.

The working medium is fed into the input channel 4 of the switching device 2.

The switching device 2 is controlled by a handle 25 with a latch 26 in three stages:

1. Left and right spools 12 and spring-loaded locking elements 20 are open (handle 25 is lifted up);

2. The right spool 12 and the spring-loaded locking element 20 are closed (handle 25 in the extreme right position);

3. The left spool 12 and the spring-loaded locking element 20 are closed (handle 25 in the extreme left position).

With the open position of the spools 12 and the spring-loaded locking elements 20 (handle 25 in the vertical position), the medium passes through both open one-way valves 9 to both safety valves 1.

If it is necessary to shut off the fluid supply to one of the safety valves 1 (to replace it or to carry out routine maintenance with it), the handle 25 is moved to the extreme position towards the safety valve 1 to be replaced, while the spool 12 of the one-way shutter 9 and the spring-loaded shut-off element 20 are pressed by a spring to the sealing surfaces, ensuring that the medium is shut off to the corresponding safety valve 1. Then, unscrew the screw to release pressure by one or two turns (relief device 27 pressure), release the pressure in the outlet channel 5 under the safety valve 1 to enable safe removal of the safety valve 1. In this case, the tightness of the spring-loaded locking element 20 and the spool 12 of the one-way valve 9 is ensured by the pressure of the spring and the working medium.

To commission the safety valve 1 after its installation, the handle 25 is translated into a vertical position in three stages:

- at the first stage, a screw is screwed to relieve pressure (pressure relief device 27);

- at the second stage, the handle 25 is moved towards the center at an incomplete angle, until the spring-loaded locking element 20 abuts against the pin 21. After opening the spring-loaded locking element 20, the working medium fills the output channel 5 under the safety valve 1 through the open spring-loaded locking element 20, while aligning pressure on both sides of the spools 12 of one-way valves 9;

- at the third stage, in the absence of a differential pressure on the spool 12 of the one-way shutter 9, the handle 25 is moved to the middle position without applying significant effort, the spool 12 of the one-way shutter 9 opens the passage section for the working medium to pass into both output channels 5 with the required at the moment of operation of the safety valve valve 1 flow.

Moreover, the diameter of the axial discharge channel 13 is inversely proportional to the square of the pressure in the input channel 4.

Thus, the technical result of the claimed utility model is achieved, namely: increasing the functionality of the switching device by expanding the range of operating pressures and temperatures while simplifying its manufacture and assembly, as well as ensuring safety during the dismantling of safety valves.

Claims (4)

1. The switching device of the safety valve block, comprising a housing with one input channel and two coaxially made output channels having saddles in their bores, and between the saddles and coaxially there is a two-way valve formed from a stem and kinematically connected with it and coaxially located relative to it two two-way valves with corresponding slide valves, the stem being driven by a drive, through one-way valves have through discharge channels, to close to There are two movable spring-loaded locking elements on the stem located coaxially to the stem, characterized in that each one-way shutter is placed and fixed in a guide located in the bore of each output channel, inside of which a saddle is formed, each through discharge channel is formed from an axial discharge channel made in the top of the spool of each one-way shutter, and the through channels associated with it, made in the body of each one-way shutter at an angle to its axis, the rod It is collapsible and is formed of two symmetrically located rods connected by a sleeve and fixed in it, while the sleeve is equipped with a drive transmission device, the part free from the sleeve of each of these rods is made integrally with a spring-loaded locking element and is fixed inside corresponding one-way shutter with the possibility (as a result of its movement) of blocking the axial discharge channel and moving the one-way shutter in the direction of opening / closing its output channel, while in the guide in front of the saddle there are through holes arranged to interact with through channels formed in each one-way shutter. 2. The switching device of the safety valve block according to claim 1, characterized in that the device for transmitting movement from the drive to the sleeve is formed from a plug mounted in the middle of the sleeve and capable of rotation at a certain angle around the axis, while the plug is mounted on a shaft driven driven. 3. The switching device of the safety valve block according to claim 1, characterized in that the actuator is made in the form of a handle with a latch having three mounting positions. 4. The switching device of the safety valve block according to claim 1, characterized in that the output channels are equipped with a pressure relief device.

Images