RU2343328C2 - Electromagnetic valve (versions) - Google Patents

Abstract

FIELD: engineering industry.

SUBSTANCE: group of inventions refers to valve engineering, and namely to pulse-operated electromagnetic valves, and is meant for being used in safety systems of heat power plants intended to control natural gas flow. Electromagnetic valve consists of a hand-operated mechanism used for setting the valve in an open position, and an electromagnet which includes external and central magnetic circuits, upper flange and a coil. Valve consists of two washers, at least one of which is made from magnetic material. Both washers are installed on one side relative to a locking element, and electromagnet is installed on the other side. One of the washers is rigidly connected to armature and locking element by means of a rod. Other washer is fixed. When setting the valve in a closed position, both washers are located near each other, and one of the washers is made so that it can adjust the finite distance between them. Valve also includes the third washer. The latter is made from magnetic material and installed in magnet circuit symmetrically relative to coil axis. There are several versions of the valve design, wherein in order to provide the possibility of manual setting of the valve in a closed position, either upper flange is made so that it can move relative to external and (or) central magnet circuits, or on external side of the valve body installed is the body of a manual backup with a spring-loaded rod.

EFFECT: developing a pulse-operated valve at low power level of control pulses, and providing the possibility of manual setting thereof in a closed position.

3 cl, 2 dwg

Description

The invention relates to valve engineering, in particular, to pulse-controlled electromagnetic valves used in the safety systems of thermal power plants for controlling the flow of natural gas.

Known solenoid valves with pulse control, for example:

A.S. USSR No. 420844, MKI F16K 31/02, publ. 03/25/74. Bull. No. 11;

A.S. USSR No. 568778, MKI F16K 31/02, publ. 08/15/77. Bull. No. 30;

A.S. USSR No. 1687989, MKI F16K 31/02, publ. 10/30/91. Bull. Number 40.

The devices contain a stop, an anchor rigidly connected with a locking member, an electromagnet, a hard magnetic element fixed in the foot, and a return spring. When a DC voltage pulse is applied to the coil of the electromagnet, a magnetic flux appears in the magnetic circuit of the electromagnet, which moves the armature with the locking member to the stop and compresses the return spring. After the end of the voltage pulse in the magnetic circuit of the electromagnet there is a magnetic flux created by a magnetically solid element that holds the anchor at the foot, overcoming the force of the compressed spring. To install the valve in the closed state, an inverse voltage polarity pulse is applied to the electromagnet. In this case, the magnetic flux generated by the electromagnet has a direction opposite to that of the magnetic flux from the magnetically solid element. As a result, the total magnetic field acting on the anchor with the locking element decreases, and under the action of a return spring it moves to the valve seat and blocks the passage of the working medium.

The disadvantages of the valves are:

1. The complexity of the valve design.

2. High power control pulses.

3. The absence of a handwheel in the valve (i.e., a device with which the valve can be installed in a closed state without using a trip control pulse).

The high power of the control pulses is associated with the presence of a return spring in the valve. With the increasing requirements for tightness to the locking element, it is necessary to use a return spring with a large compression force and, accordingly, to supply a large power of control pulses to the electromagnet. In addition, a stiff return spring requires the use of a hard magnetic element with a large magnetic flux that can withstand the force of the compressed return spring and keep the valve open. And this leads to a complication and appreciation of the valve.

For valves with pulse control, it is always advisable to have a manual backup, with which the valve can be returned to its original state. This is due to the fact that in the event of a failure of the source of control pulses, a break in the communication line from this source to the valve, the absence of a manual backup makes it impossible to quickly stop the flow of the working medium through the valve.

Known electromagnetic valve with pulse control, RF Patent No. 2016332, IPC F16K 31/02, publ. 07/15/94. Bull. No. 13.

The device contains an anchor with a locking member, an electromagnet, a spring, a magnetically hard insert installed between the lower flange and the stop. The valve is controlled by voltage pulses of different polarity. Here, to keep the valve closed, the use of a spring is not required. This function is performed by a magnetically hard insert capable of providing high tightness of the locking element. However, such a constructive solution leads to a sharp increase in the power of control pulses. To reduce this power, a spring is used in the valve, which is designed to weaken the force of action of the magnetically solid insert and, accordingly, somewhat reduce the power of the control pulses, and at the same time create the force necessary to keep the valve open.

The disadvantages of the valve are:

1. The complexity of the design.

2. High power control pulses.

3. The lack of a manual backup for installing the valve in a closed state.

Here, a large power of control pulses is needed both when opening and when closing the valve. In the first case, the control pulse must overcome the residual force of the magnetic insert, with which the locking member is pressed against the saddle. In the second, it must overcome the force of the spring, with the help of which the locking element is kept open. At the same time, a decrease in the spring stiffness makes it possible to reduce the closing pulse power, but at the same time, the pulse power required to close the valve will increase, and vice versa.

Known solenoid valve A.S. USSR No. 379806, MKI F16K 31/06, F16K 37/00, publ. 04/20/1973. Bull. No. 20.

The device contains an anchor rigidly connected to the locking element, an electromagnet with two control windings, a permanent magnet. The valve design does not have a spring holding it in one of the positions.

When a voltage pulse is applied to the upper winding, the armature moves upward, opening the valve shutter, and in the absence of a supply voltage it is held in this state by means of a permanent magnet field. When a voltage pulse is applied to the lower winding, the armature moves down, locks the valve shutter and is held in this state by the magnetic flux of the same permanent magnet.

The disadvantages of the valve include:

1. The complexity of the design.

2. Large power control pulses, which must be brought to the winding at the time of switching the valve from one state to another.

3. Low valve shutoff tightness. This is explained by the fact that in this design it is difficult to create a large magnetic flux force created by a permanent magnet and pressing the locking element to the valve seat due to large losses in the magnetic circuit.

4. The lack of a manual backup to install the valve in its original (closed) state.

Closest to the claimed is a solenoid valve, patent of the Russian Federation, No. 2282090, IPC F16K 31/06, publ. 08/20/2006. Bull.№23.

The device contains an electromagnet, a valve seat, a locking element with an anchor, a manual control mechanism for setting the valve in the open state, an electromagnet. The valve consists of two washers, at least one of which is made of magnetic material. Both washers are installed on one side relative to the locking element with an anchor, and an electromagnet on the other. One of the washers is rigidly connected by means of a rod with a locking body, the other is fixedly mounted. When the valve is installed in a closed state, both washers are in close proximity to each other, and one of the washers is configured to control the distance between them.

The advantages of the valve include: simplicity of design, high tightness of the shut-off element, low consumption of electric power necessary to keep the valve in working (open) state.

The disadvantages are the inability to work in a pulsed control mode. The objective of the invention is to enable the valve to operate in a pulsed control mode and manually set it to a closed state at a low power level of the control pulses, as well as maintaining the simplicity of design and high tightness of the shut-off element.

The technical result in the claimed invention is achieved by the fact that the solenoid valve, comprising: a manual control mechanism for setting the valve in the open state, an electromagnet, which includes: external, central magnetic circuits, upper flange and coil, valve seat, anchor with a locking member, made with the possibility of movement between the valve seat and the electromagnet, the first and second washers, at least one of which is made of magnetic material. Both washers are installed on one side relative to the locking element, and the electromagnet on the other. One of the washers by means of a rod is rigidly connected with the anchor and the locking element, the other is fixed, when the valve is in the closed state. Both washers are in close proximity to each other, and one of the washers is configured to adjust the final distance between them.

According to the invention, a third washer is introduced into the valve composition, made of magnetic material and installed in the magnetic circuit symmetrically to the axis of the coil.

In the versions of the electromagnetic valve, the upper flange of the electromagnet is made with the possibility of movement relative to the external and (or) central magnetic circuit, or on the external side of the valve body there is a case of a handwheel with a spring rod. In this case, the spring-loaded rod is made with the possibility of mechanical impact on the anchor with a locking body, and the body of the manual backup - with the possibility of sealing the spring-loaded rod.

The achievement of the technical result in terms of enabling the valve to operate in pulsed mode in the inventive device is carried out by installing in the magnetic circuit a third washer of magnetic material symmetrically to the axis of the coil.

To ensure a low level of control pulses, two conditions must be met:

1. Use a third washer of magnetic material with the lowest possible magnetic flux.

2. The magnetic circuit of the electromagnet should eliminate the unevenness of the magnetic fluxes flowing in the magnetic circuit under the action of a permanent magnet and an electromagnet.

It is known that the higher the magnetic flux from a permanent magnet, the more force the anchor with the locking member is held on the working surface of the electromagnet. In this case, with an increase in the magnetic flux created by the permanent magnet, it is necessary to increase the magnitude of the magnetic flux of the electromagnet, with which the magnetic flux of the permanent magnet is compensated, and vice versa. At the same time, the smaller the magnitude of the magnetic flux of the permanent magnet, the less is the force to keep the valve open. In order to ensure the required holding force of the valve in the open state and at the same time use a permanent magnet with a low magnetic flux value, it is necessary to use a magnetic circuit design that would minimize the loss of magnetic flux in the operating state (when the valve is open). In known pulse valve designs, there is always a gap between the armature and the bottom flange of the magnetic circuit (in the literature this gap is often called spurious). It is here that most of the magnetic field of the permanent magnet and electromagnet is lost. In practice, the gap in this area is 0.1-0.2 mm, and in cases where the sealing tube is completely made of non-magnetic material, the gap increases to 1.0 mm or more. In the design of the prototype, the working surface of the magnetic circuit is made flat, while the anchor is adjacent to the fixed part of the magnetic circuit without gaps. This circumstance allows using the prototype to obtain a holding force of the moving part of the magnetic system greater than other known designs of valves with pulse control and, as a consequence, to use a permanent magnet with a small flux of magnetic induction.

The presence of a gap between the armature and the fixed part of the magnetic circuit in the region of the lower flange is, in addition, the reason for the inhomogeneity of the magnetic flux in the magnetic circuit both from the permanent magnet and from the electromagnet. This is due to the inability to achieve complete symmetry of the gap between the anchor and the lower flange around the entire circumference of the armature. In the prototype, due to the lack of gaps between the anchor and the fixed part of the magnetic circuit, this problem does not arise. Here, it is possible to obtain the complete symmetry of magnetic fluxes caused by the action of a permanent magnet and an electromagnet. In conditions of small magnetic fields, namely this case is of interest for solving the problem of minimizing the control pulse, the unevenness of the magnetic flux along the perimeter of the armature does not fully and simultaneously compensate for the magnetic field of the permanent magnet. For this reason, in particular, in all known designs of valves with pulse control for returning the armature with a locking element to its original state, this problem is solved either by means of a return spring, or a special design of an electromagnet, for example, with two windings, is used. In the end, this leads to a complication of the design and the need to increase the power of the control pulse.

The pulse operating mode, in addition to advantages, also carries a serious drawback, which can cause an accident if, for example, if necessary, the valve condition is changed if the control pulse formation circuit, or the circuit through which this pulse is supplied to the valve, seems to be faulty. In such cases, it is very important to be able to transfer the valve from the working state to the initial (inoperative) state by mechanical action.

The achievement of the technical result in terms of the implementation of the possibility of installing the valve in a closed state without using a control electric pulse in the inventive device is provided by the implementation of the upper flange with the possibility of movement relative to the central and (or) external magnetic circuits.

The technical result is achieved in that the movement of the upper flange relative to the external and central magnetic cores will inevitably lead to a break in the magnetic field lines of magnetic flux. As a result, the magnetic field holding the anchor with the locking element in the upper position will tend to zero, and the valve will close. In this case, to turn off the valve (to close the valve), the magnetic flux can be broken either between the upper flange and the central magnetic circuit, or between the upper flange and the external magnetic circuit, or between the upper flange and simultaneously the central and external magnetic circuits.

In addition, the implementation of the upper flange with the ability to move relative to the Central and (or) external magnetic circuits allows you to:

- to solve the problem without violating the tightness of the valve (without the need to penetrate the internal cavity of the valve filled with the working medium), which eliminates the possibility of leakage of the working medium from the internal cavities of the valve;

- to solve the problem without significantly complicating the design of the valve;

- to unify as much as possible the design documentation of the valve for its different designs.

The achievement of the technical result in terms of installing the valve in its original (closed) state without using an electric pulse in the inventive device can also be accomplished by installing a handwheel body with a spring-loaded stem on the outside of the valve body either at an angle or parallel to the working surface of the magnetic circuit. In this case, the rod is made with the possibility of acting on the anchor with a locking member, and the case of the manual backup is with the possibility of sealing from the external environment of the guide hole in which the spring-loaded rod moves.

The need to use a handwheel housing with a spring-loaded stem to set the valve in the closed state may arise in the case when it is necessary to ensure a tight design of the electromagnet coil.

In the inventive device, the force with which the anchor with the locking element is held in the upper position is small, does not exceed 100 g. For normal operation of the valve, a large amount of this force is not needed.

In addition, with the appearance of a gap between the working surface and the anchor with a locking body, this force rapidly decreases. It is enough to move the anchor with the locking body a small distance from the working surface, so that this force begins to tend to zero.

In this case, an external mechanical effect on the anchor with the locking member, in which there is a component directed away from the working surface of the magnetic circuit, will inevitably lead to the movement of the armature with the locking member to the lower position and, accordingly, to closing the valve. It is enough that this effect leads to the appearance of a small gap between the anchor with the locking member and the working surface of the magnetic circuit. Such a mechanical effect in the inventive device is achieved, for example, using a spring-loaded rod, if it is installed at an angle of ~ from 5 to 60 ° to the working surface of the valve. Installing the manual backup case with a spring-loaded stem at an angle of less than 5 ° to the working surface reduces the reliability of the manual backup. The installation of a handwheel body with a rod at an angle of more than 60 ° makes it difficult for a spring-loaded rod to act on an anchor with a locking element.

A spring-loaded rod can be installed parallel to the working surface of the magnetic circuit, but the end of the rod must be made in the form of a sharp wedge, and the perimeters of the working surfaces of the magnetic circuit and the armature must have a chamfer for the end of the rod to enter.

Due to the fact that the spring-loaded rod, by means of which the anchor is acted upon with the locking element, is in contact with the working medium, the case of the manual backup must be made with the possibility of tight execution of the spring-loaded rod relative to the external environment.

Sealing the stem with respect to the environment is achieved:

a) the use of soldering technology for the sealed execution of the installation location of the handwheel on the outside of the valve body;

b) using a sealing seal made in the form of a ring of rubber and preloaded by a return spring in the region of the guide hole on the body of the handwheel in which the spring-loaded rod moves.

The rod, with the help of which the effect on the anchor with the locking body is carried out, is spring-loaded in order to ensure the possibility of returning it to its original state after the impact on the anchor with the locking body.

In this way:

1. Introduction to the valve composition of the third washer made of magnetic material, and its installation in the magnetic circuit symmetrically to the axis of the coil, allows the valve to operate in pulsed control mode and to change the state of the valve with low power pulses.

2. The implementation of the upper flange with the ability to move relative to the external and (or) central magnetic circuits allows you to set the valve in its original (closed) state without the use of an electrical control signal.

3. Installing the body of the handwheel with a spring-loaded stem on the outside of the valve, the execution of this stem with the possibility of acting on the anchor with a locking body, and the body of the handwheel with the ability to seal the spring-loaded stem also allows you to set the valve in its original (closed) state without using an electrical control signal .

Figure 1 shows the design of the inventive valve with pulse control, in which to install it in a closed state using a movable upper flange. Figure 2 shows a fragment of this valve, in which a handwheel installed on the outside of the valve body is used to set it to the closed state.

The electromagnetic valve (Fig. 1) contains a manual control mechanism 1 for setting the valve in the open state, an electromagnet, which includes an external 2 and central 3 magnetic circuits, an upper flange 4 and a coil 5, a valve seat 6, an anchor with a shut-off element 7, the first 8 and the second washer 9, the rod 10, through which the first washer 8 is connected with the anchor and the locking element 7, the third washer 11 made of magnetic material, a screw 12 and a spring 13, the working surface 14 of the electromagnet, the rod 15, button 16, the return spring 17 and sealing seals 18 and 19 of the manual control mechanism for setting the valve in the open state, the handle 20, rigidly connected with the upper flange 4.

A fragment of the valve (Fig. 2) comprises a valve body 21, a handwheel body 22, a stem 23, a return spring 24, a sealing seal 25, a handwheel cover 26.

The device operates as follows.

In the initial state, the valve is closed. In this case, the anchor with the locking member 7 is pressed against the valve seat 6 using the first 8 and second 9 washers, which in this case are located in close proximity to each other and are under the influence of attractive forces due to the fact that at least one of these the washer is made of magnetic material. The voltage on the coil of the electromagnet is absent.

Due to the fact that between the central 3 magnetic circuit and the upper flange 4, a third 11 washer of magnetic material is installed in the magnetic circuit of the electromagnet, under its action, magnetic flux F1 flows. Due to this, on the working surface 14 of the electromagnet there is always a magnetic field capable of holding the anchor with the locking element 7 in the upper position, if the latter is brought into contact with the working surface 14.

When moving the anchor with the locking element 7 to the upper position using the manual control mechanism 1 (by means of the button 16 and the stem 15), the valve opens. When the anchor with the locking body 7 of the working surface 14 reaches, an attractive force arises between them, under the influence of which the anchor with the locking body 7 is held in the upper position (at the working surface 14) for an arbitrarily long time.

After applying a DC supply voltage to the electromagnet coil, magnetic flux F2 begins to flow in the magnetic circuit. The direction of this flow depends on the polarity of the supply voltage. By changing it, one can establish a direction of the magnetic flux Ф2, which would have a direction opposite to the flux Ф1. By changing the amplitude of the supply voltage of the electromagnet coil, it is possible to set the flux Φ2 equal to the flux Φ1. With the equality of F1 and F2, the total component of the magnetic flux in the region of the working surface 14 will be zero. Accordingly, the magnetic field holding the anchor with the locking element 7 in the upper position will also become equal to zero. Under the influence of its own weight, as well as a small force of attraction, which exists between the first 8 and second 9 washers, the anchor with the locking body 7 moves to the lower (initial) position. As a result, the valve closes. After that, the control voltage can be turned off. But this will not change the state of the valve. The magnetic field on the working surface 14, arising under the influence of the flux F1, after disconnecting the supply voltage of the coil is able to exert an effect on the armature with the shutter 7 only at small (0.2-0.3 mm) distances between them.

The resetting of the valve can be performed without the use of an electrical control signal.

In the inventive device, this task can be performed due to the possibility of moving the upper flange 4 relative to the outer 2 and central 3 magnetic circuits. This is achieved by attaching the upper flange 4 with screws 12 and springs 13. The screws 12 are made of non-magnetic material, pass freely into the holes of the upper flange 4 and are tightly screwed into the casing of the outer 2 magnetic circuit. Using springs 13, the upper flange 4 is always pressed against the ends of the outer 2 and central 3 magnetic circuits, thereby providing a chain for the flow of magnetic flux from the third 11 magnetic washers. In this case, it remains possible to move the flange 4 up along the axis of symmetry of the electromagnet. If you lift the upper flange 4, for example, using the handle 20, then the chain of the magnetic flux from the washer 11 will break, the magnetic field on the working surface 14 will become equal to zero, as a result, the armature with the locking element 7 will move to the lower (initial) position, and the valve will close.

The installation of the valve in its original state in the inventive device can also be performed using a manual backup mounted on the outside of the valve body 21 (see figure 2).

The structure of the manual backup includes: the housing of the manual backup 22 mounted on the outside of the valve body at an angle to the plane of the working surface 14, the rod 23 with which you can act on the anchor with a locking body 7, the return spring 24, the sealing seal 25 and the cover 26 of the manual understudy. When you click on the rod 22, it moves to the anchor with the locking element 7 and has a mechanical effect on it. Due to the fact that the body of the handwheel is installed at an angle to the working surface 14, this mechanical effect contains a component directed away from the working surface 14.

In this case, it is enough to use the rod to move the anchor with the locking body a small distance (0.2-0.3 mm) from the working surface so that the valve changes its state.

After the valve is installed in its initial (closed) state, the mechanical action on the stem 23 ceases and it returns to its original state under the action of the return spring 24. To maintain the tightness of the internal cavity of the valve with respect to the external environment, a sealing ring in the form of a rubber ring 25 is installed in the area of the guide hole for the spring rod in the housing of the handwheel 22, which is pressed against the base of the handwheel using a spring 24. In turn, the rubber ring 25, deforming under the action of the return spring 24, compresses the rod 23, ensuring the tightness of the handwheel.

The design of the inventive valve was tested on valves with a bore of 15, 20, 25 mm. Air with a pressure of up to 0.1 MPa was used as a working medium.

The inventive valve was manufactured using the following materials and components:

1. All elements of the magnetic circuit, including the central 3 and external 2 magnetic cores were made of steel 20880 (Armco) with annealing after machining.

2. The locking element and the anchor 7 were made as one piece of steel 20880. To seal the locking element, an anchor made of rubber НО-68 was installed on the anchor with the locking element.

3. The valve seat 6, stem 10, stem 15 and button 16 of the manual control mechanism 1 for setting the valve in the open state were made of non-magnetic materials.

4. The sealing of the manual control mechanism 1 for setting the valve in the open state in the region of the second 9 washers and the rod 15 of the manual actuator was performed using washers 18, 19. The sealing of the rod 23 in the housing 22 of the manual backup was made using a rubber washer 25. All sealing washers 18 , 19, 25 are made by casting from HO-68 rubber.

5. Washer 8 and washer 11 - permanent magnets are made of samarium-cobalt. Washer 8 - in the form of a disk with a diameter of 10 mm and a height of 5 mm. Washer 11 - in the form of a disk with a diameter of 8 mm and a height of 2 mm.

6. The coil 5 of the electromagnet is made of wire PEV1, the diameter of the wire without insulation is 0.1 mm. The coil resistance is 400 ohms.

7. To control the valve (in the mode of turning it off), a voltage pulse with an amplitude of 12 V was used. The pulse power sufficient to transfer the valve to the closed state is ≥0.36 W.

8. To move the upper flange, two brass screws 12 with an M3 thread and a height of 18 mm were used. Springs 13 (2 pcs.) Were made of spring wire with a diameter of 0.8 mm. The force with which each spring 13 pressed the upper flange 4 to the cores 2 and 3 was 800 g.

9. To turn off the valve using the upper flange 4, it is enough to move it up from the magnetic circuits 2 and 3 to a height of 0.5 mm.

10. The body 22 of the manual understudy was made of brass and soldered into the brass body 21 of the valve using POS-61 solder.

11. The stock 23 of the manual understudy was made from st 3.

The inventive valve provides:

1. The ability of the valve to operate in a pulsed control mode while reducing the power of the control pulse by at least three times compared with the well-known and widespread analogue - valve type MKG, KEMG (manufacturer GUNPP Almaz Saratov). The inventive valve retains the important advantages of the prototype: high tightness of the shut-off element, simplicity of design.

2. The ability to set the valve in the closed state manually, without using an external electrical control pulse. Moreover, this opportunity can be implemented in two ways:

a) using a movable upper flange, allowing to break the magnetic flux in the magnetic circuit;

b) using a manual understudy by mechanical action on the anchor with a locking body.

Two versions of the valve, regarding the possibility of installing it in a closed state, expands the scope of use of the inventive device.

Claims (3)

1. An electromagnetic valve comprising a manual control mechanism for setting the valve in an open state, an electromagnet comprising an external, central magnetic circuit, an upper flange and a coil, a valve seat, an armature with a locking member, arranged to move between the valve seat and the electromagnet, the first and second washers, at least one of which is made of magnetic material, both washers mounted on one side relative to the locking element, and an electromagnet on the other, one of the washers the rod means is rigidly connected with the anchor and the locking element, the other is fixed, when the valve is in the closed state, both washers are in close proximity to each other, and one of the washers is configured to adjust the final distance between them, characterized in that the valve introduced the third washer, made of magnetic material and installed in the magnetic circuit symmetrically to the axis of the coil. 2. An electromagnetic valve comprising a manual control mechanism for setting the valve in an open state, an electromagnet comprising an external, central magnetic circuit, an upper flange and a coil, a valve seat, an armature with a locking member, arranged to move between the valve seat and the electromagnet, the first and second washers, at least one of which is made of magnetic material, both washers mounted on one side relative to the locking element, and an electromagnet on the other, one of the washers the rod means is rigidly connected with the anchor and the locking element, the other is fixed, when the valve is in the closed state, both washers are in close proximity to each other, and one of the washers is configured to adjust the final distance between them, characterized in that the valve the third washer is introduced, made of magnetic material and installed in the magnetic circuit symmetrically to the axis of the coil, and the upper flange of the electromagnet is arranged to move relative to the external and (or) center ceiling elements of magnetic circuits. 3. An electromagnetic valve comprising a manual control mechanism for setting the valve in an open state, an electromagnet comprising an external, central magnetic circuit, an upper flange and a coil, a valve seat, an armature with a locking member, arranged to move between the valve seat and the electromagnet, the first and second washers, at least one of which is made of magnetic material, both washers mounted on one side relative to the locking element, and an electromagnet on the other, one of the washers the rod means is rigidly connected with the anchor and the locking element, the other is fixed, when the valve is in the closed state, both washers are in close proximity to each other, and one of the washers is configured to adjust the final distance between them, characterized in that the valve a third washer is introduced, made of magnetic material and installed in the magnetic circuit symmetrically to the axis of the coil, and on the outside of the valve body there is a case of a handwheel with a spring-loaded stem, and the spring-loaded stem is made with the possibility of mechanical action on the anchor with a locking body, and the body of the manual backup - with the ability to seal the spring-loaded rod.

Images