RU2350813C1 - Redundant shut-off electro pneumatic modular valve intended for built-in mounting, high pressures and temperatures - Google Patents

Abstract

FIELD: mechanics.

SUBSTANCE: invention relates to hydro pneumatic control means and is designed to control and shut off working medium flows in service pipelines transporting, primarily, high-pressure and high-temperature gases in gas, oil, chemical and other industries. Proposed valve comprises body, main and auxiliary shut-off members, detachable guiding cylinder and driving mechanism. It represents integral unit-module provided with redundant control system designed to allow selective valve operation in various operating conditions, i.e. remote valve control and control including fixed manual duplication of electrical signal with common circuits of remote and local signaling in compliance with the main shut-off member position in the valve, that is, "on-off". The shut-off member driving mechanism represents a connecting device made up of two components, i.e. electromagnetic drive and stand-by drive of the electrical signal fixed manual duplication. Both drives are linked up with the shut-off valve control rod and are, both functionally and structurally, integrated into common detachable control unit with rigidly attached housing and magnetic circuit cover. To mount the electromagnetic drive in the said control unit housing, there is a central vertical, through multi-stage bore with threaded section and guide cylindrical surface. The minor stage of the aforesaid bore receives guide cartridge with outer circular thrust collar made in antimagnetic anti-friction material and furnished with the magnetically soft stop, the guide cartridge being rigidly fixed in the said bore and the said stop being furnished with a central hole. The housing central part outer side accommodates power supply lead-in holes. Electromagnetic drive incorporates two electromagnetic coils located coaxially in the magnetic circuit cover. The central coils makes a "pulsed" (starting) coil operated in intermittent (pulsed) mode. The other, peripheral, coil makes a "holding" continuous-duty coil. Currents consumed to open the valve shut-off members and to hold them open are selected in compliance with certain relationships. There is signaling and switching unit incorporating three hermetic contacts and lamp made from transparent and scoop-proof material. The electrical signal fixed manual duplication drive represents a command unit to control the drive shaft furnished with annular sealing elements of outer cylindrical surface and a handle designed to perform limited turn of the shaft in horizontal plane. The aforesaid drive kinematic linkage with the shut-off valve control rod represents a pushing pin arranged eccentrically relative to the axis of turn. The drive shaft incorporates a locking element representing cylindrical pin.

EFFECT: higher reliability, improved performances.

7 cl, 8 dwg

Description

The invention relates to the field of hydropneumatic automation, in particular to locking and regulating devices used in the gas production, gas processing, oil, petrochemical and chemical industries for regulating and blocking the flow of a working medium in pipeline technological lines or highways transporting mainly gaseous media with high pressures and temperatures.

Known direct-acting electro-pneumatic valves (see SU 1000654 A, F16K 31/02, published on 02/28/1983, bull. No. 8 or patent RU 2282771 C1, F16K 31/06, published on 08/27/2006, bull. No. 24). These devices contain an anchor rigidly connected to the locking member. A seat is formed in the valve body, to which a locking member is pressed by means of a spring. The valve is controlled by a built-in electromagnetic drive with an insulating tube in which the armature and stop are placed. When applying an electric signal to an electromagnetic actuator, the armature moves in the direction of the stop, entraining the locking element, thereby opening the shutter-valve for the passage of the working medium.

The disadvantage of these direct-acting valves is the need to use a magnet of high power. With an increase in the flow area of the valve, the working stroke of the shut-off element increases and, as a result, the power of the electromagnet necessary to install the valve in the open position increases. With increasing power, the mass and, accordingly, the working temperature of the electromagnetic drive increases, which leads to a decrease in valve reliability.

A known electromagnetic valve (see RU 2282090 C1, class F16K 31/06, publ. 08/20/2006, bull. No. 23) containing a manual control mechanism for installing the valve in the open position, an electromagnet, valve seat, an anchor with a shut-off body, made with the possibility of movement between the valve seat and the electromagnet, two washers, one of which is made of magnetic, the other of magnetically conductive material, both washers mounted on one side relative to the locking element with the armature, and the electromagnet on the other side.

The specified valve allows to reduce the power consumed by the valve, however, bringing it into the open state exclusively by manual control significantly limits its scope in industry, for example, in trunk lines with an automatic system for controlling the flow of the working medium.

Currently, one of the urgent tasks is to create a reliable and easy-to-operate shut-off valve design designed for locking and free access with minimal resistance to the working medium. At the same time, the need to ensure high reliability and economical operation of the valves when used in high pressure systems, a high degree of tightness in the closed position, and also in response speed is highlighted.

These requirements are most fully satisfied by indirect operated valves with two control stages, which are most widely used due to lower energy costs for valve control and unlimited possibilities of application in automated systems.

To increase the sensitivity of valves and pressure stability, as well as to ensure effective valve unloading from axial forces, servo-assisted valves are currently widely used (see T. M. Bashta, “Hydraulic Drives of Aircraft,” Moscow, “Mechanical Engineering”, 1967 ., p. 246, fig. 184).

In designs of this type of valves, in addition to the main locking element, an auxiliary locking element with reduced geometric operating parameters is used, the movements of which are monitored by the main locking element, which bypasses or closes the main flow of the working medium under pressure. When you open the auxiliary locking element, the pressure in its control chamber decreases, as a result of which the main locking element opens synchronously. When a command is issued to close the auxiliary locking element, the main locking element automatically closes, and the force for opening the valve with servo action is determined only by the area of the locking part of the auxiliary locking element and the corresponding control pressure of the working medium.

Known two-stage electro-pneumatic main valve (see RU 2277664 C1, class F16K 31/02, publ. 06/10/2006, bull. No. 16), comprising a housing with a main seat, inlet and outlet pipes, a housing cover with fixed under it electromagnetic drive as part of the winding, the protective element of the winding, the yoke of the central rod, the armature with a sealing disk at the end and the return spring, as well as a servo-drive in the form of a cylinder with loading and unloading holes and a control seat. Compared with the known technical solutions, this valve has a rather simple design and is characterized by rational overall dimensions and manufacturability.

However, with all the structural and technological advantages, the known valve has the disadvantage that its design is designed to operate with a sufficiently low level of working medium pressure from 0 to 2.5 MPa and low temperatures of this medium, due to the use of elastomeric seals in the valve, which are part of the locking organs of both control cascades.

These seals, experiencing significant alternating deformations and pressure and temperature differences at higher pressures, undergo increased mechanical wear, which reduces the reliability and service life of the valve as a whole.

Due to the complication of pipeline valves, increased pressures and velocities of the working media, requirements for valve devices have increased in accordance with the features of the new working conditions, the main of which are high temperatures of the working medium due to kinetic heating and heat generated during operation of the valve itself.

From the above it follows that the temperature conditions become so harsh that the existing known valves and the materials used in them become unusable. At the current level of technology, the performance of shut-off valves of the main systems should be provided and maintained in a wide range of pressures from 0 to 16 MPa and temperatures from minus 50 ° C to + 200 ° C and under conditions of aggressive influences of the working environment.

Among the known analogues of the claimed technical solution, the closest analogue (prototype) is an electropneumatic valve of a normally closed type with a two-stage operation mode (see patent RU 2267685 C2, 7 F16K 31/02, publ. 10.01.2006, bull. No. 1). The known electro-pneumatic valve contains the maximum number of structural features similar to the claimed valve, namely: both valves are normally closed type with a two-stage operation mode and contain a housing with inlet and outlet sections for the passage of the working medium, communicating with each other through the annular cavities separating them, with a central vertically located cylindrical bore and coaxially placed in it two successively open spring-loaded locking elements - the main locking body (the main valve, made integral with the control piston and located with the possibility of axial movement relative to the guiding bore and interacting with the seat and an auxiliary locking member (pilot valve), formed with reduced geometric parameters compared to the first locking member and an electromagnetic drive.

Analysis of the valve of the analogue-prototype shows that the layout of its circuit solution allows the valve to operate as a whole, however, the practical implementation of this task requires certain structural and technological complications, improvements, the introduction of a system of internal channels and a number of sealing devices, the installation of which imposes certain technological difficulties in wiring these channels and ensuring the tightness of joints, rigidly interconnected parts of the valve.

The design of the analog valve - prototype valve repeats the above disadvantage of the analog valve (see RU 2277664 C1, class F16K 31/02, published June 10, 2006), expressed in the use of locking elements, the sealing elements of which are made of elastomeric materials, inclined under the influence of large differences in pressure and temperature to increased mechanical wear, which reduces the reliability and service life of the valve.

In addition, the known valve does not exclude the possibility of self-oscillations (vibrations) of the main locking element, especially in valves with high flow rates, due to the significant length of its cantilever locking part and due to the fact that the inlet of the working fluid flow under pressure into the body cavity is carried out through the side hole, and the output is through the central hole of the stepped housing boring. In these cases, significant radial components of the active flow forces acting on the main shut-off element arise and spasmodic changes in the flow rate of the conducted medium occur, as a result of which the valve’s operating characteristics are significantly impaired.

The known valve has a high probability of reducing the tightness of the locking elements due to the lack of the possibility of their self-installation relative to the corresponding contact surfaces of the valve seats. The asymmetric scheme for connecting the known valve to the pipelines of the main line imposes certain technological difficulties in organizing the installation (dismantling), technical inspections, maintenance and repair.

A disadvantage of the known technical solutions, including the prototype, is also the lack of the ability to control the shut-off valve using an auxiliary drive for manual duplication of the electrical signal, objectively necessary for manual control of the valve in cases of commissioning or repair work with the power supply off. In addition, the manual control actuator fully ensures trouble-free operation of the valve in extreme or emergency situations.

The growth of the technical level of operation of trunk systems with variable energy consumption of the working environment requires the creation of shut-off and control equipment with qualitatively new characteristics. In addition, it should be compact and have high operational manufacturability.

It should be noted that most of the considered types of shut-off valve designs, including the design of the prototype analogue, have, as a rule, "monofunctional" applications, therefore the most urgent issue today is the development and creation of shut-off valves for universal use, combining "multifunctional" features and thus reducing the existing range of designs of two-stage shut-off valves.

At the current level of technology, the known design of locking and regulating devices, including the design of the analogue prototype, do not satisfy the developers of the objects of application due to the mismatch of locking devices with special requirements. In particular, the requirements to ensure the principles of aggregation and modularity of the performance of constituent elements. Fulfillment of these conditions makes it possible to carry out autonomous testing of technical specifications and tests, allows the installation of a locking and regulating device directly in the production line or in the line of the main system, as well as to simplify the work associated with installation, dismantling and repair directly at the application.

Together, these disadvantages of the known electropneumatic valve of the analogue of the prototype sufficiently reduce the performance and limit its use, for example, under the influence of high temperatures, pressures and significant energy of the flow of the "throttled" gas, often containing foreign impurities, in particular mechanical impurities.

The technical task of the invention is to eliminate these drawbacks and create such an effective shut-off valve design that combines the capabilities and advantages of known shut-off devices, but has a more reliable, technologically advanced and maintainable design with the simultaneous achievement of other technical and economic indicators:

- the implementation of the shut-off valve in the form of a single block module with the ability to easily integrate directly into the line of the main system and autonomous testing of technical characteristics,

- reduction of pressure and power losses by shortening the path and maximizing “straightening” of the path of the main fluid flow through the valve.

- increasing the sensitivity and speed of the locking organs and reducing hysteresis phenomena in transient control modes,

- improving performance and ensuring the tightness of the valve shut-off elements under conditions of exposure in a wide range of positive and negative temperatures and high pressures of a chemically active working medium,

- improvement and stabilization of the tightness parameters for locking elements by compensating for various production and technological errors that occur during manufacture and due to temperature and elastic deformation processes in the parts during operation by the possibility of their self-installation on the sealing seats and installation of the filter device in the working medium inlet line to auxiliary locking organ

- expanding the operational capabilities of the shut-off valve and improving operational safety due to:

- providing control of the valve both manually and remotely using an electrical signal generated on the control panel,

- increase the efficiency of the electromagnetic drive by creating an energy-saving magnetic coil with automatically changing power during operation,

- automatic issuance of information about the position of the main locking element in the valve (“closed” - “open”).

In accordance with the "Safety Rules for Gas Distribution and Gas Consumption Systems" PB 12-529-03 ("Scientific and Technical Center for Safety in Industry of the Gosgortekhnadzor of Russia", Moscow, 2003, clause 2.4.1, p.31-32 ) a mandatory requirement for gas pipeline equipment, in particular for shut-off valves, is the presence of a supply voltage on the coil of the electromagnet in the working state of the valve, while closing the valve can only be done by removing the voltage from the electromagnet. For this reason, for example, pulse-controlled valves cannot be used as shut-off valves in automation systems using natural gas.

The problem is solved in that in the inventive redundant shut-off main line electro-pneumatic valve of modular design for built-in installation, high pressures and temperatures (shut-off valve), comprising a housing with inlet and outlet sections for the passage of the working medium, communicating with each other through inner ring cavities separating them, with a central vertically located stepped cylindrical bore and coaxially placed in it two successively open spring-loaded locks organs - the main locking element (main valve), made integral with the control piston and located with the possibility of axial movement relative to the guiding bore and interacting with the body seat and auxiliary locking element (pilot valve), formed with reduced geometric parameters compared to the main locking element and an electromagnetic drive controlling through the control rod (pusher) an auxiliary locking member, according to the invention, a locking main electronic ropnevmatichesky valve (valve), which includes a housing, the main and auxiliary locking bodies, is equipped with a removable guide cylinder for the main locking body and the actuator and is formed as a single block module with the ability to be embedded directly into the trunk line and is made with a redundant control system a process configured with the possibility of selective operation of the valve in remote control and control modes with fixed manual duplication of electrical a signal with common remote and local signaling circuits according to the position of the main locking element in the valve “closed-open”, while the drive mechanism of the auxiliary and, accordingly, the main locking elements is formed in the form of a connecting device of two components - an electromagnetic drive and a backup drive of a fixed manual duplication of the electric signal, both drives are kinematically connected to the control rod of the shut-off valve and are structurally and functionally combined into a single a removable command control unit and are rigidly connected by a common casing and the cover of the magnetic circuit; a central vertically located through multistage boring with a threaded section and a cylindrical guide surface for tight and coaxial connection of the command control unit to the guide cylinder of the shutoff valve is formed in the housing of the command control unit for installing an electromagnetic drive a guide sleeve with an outer ring is rigidly mounted in a small step of the central bore of the housing with a support collar made of antimagnetic antifriction material with a groan of soft magnetic material with a central hole, power supply cavities are formed on the outer side of the middle part of the housing, and a radially directed through boring hole is formed on the side surface of the central bore, while the electromagnetic drive contains coaxially placed in the magnetic circuit cover two electromagnetic coils, the central one is formed with the function of a “pulse” (starting) coil with short-term (pulse) operating mode, the other with a peripheral location, implemented in the "holding" coil with a long operating mode, with lower output power and power consumption, while the current consumption for opening the valve shut-off elements and keeping them open in operation mode is selected in accordance with the ratio:

Jimp / J hold = 10 ... 16,

where Jimp is the current consumption at the start of the valve opening in the pulse control mode, A;

Juder is the consumed current that keeps the locking elements in the open state for continuous operation, A. A spring-loaded core anchor installed inside the guide sleeve, rigidly connected to the valve control rod and the end position indicator rod of the main locking element, located axisymmetrically to the control rod and equipped with a permanent magnet , an alarm and switching unit for automatically switching off the pulse coil when the main locking body reaches the upper position and issuing formations about the state of the valve (“open” - “closed”) on the control panel, the signaling and switching unit includes a tubular housing, in the upper part of which a switching unit with three reed switches is fixed, a lantern made of translucent and impact-resistant material is installed in the upper area of the magnetic circuit cover , a board with light-emitting diodes of various colors is mounted inside the lantern, the drive for fixed manual duplication of the electric signal is made in the form of a com one control unit of the drive shaft with ring sealing elements on the outer cylindrical surface and a handle with the possibility of limited rotation of the shaft in the horizontal plane at an angle of 180 ° ... 190 °, and the specified kinematic connection of the drive of a fixed manual duplication of the electrical signal with the control rod of the shut-off valve is made in the form on the opposite side of the end wall of the drive shaft of the pushing pin with an eccentric arrangement relative to the axis of rotation with the possibility of t the act of manual control of the engagement of the finger with the end surface of the annular two-sided ledge of the control rod and the formation of the trigger signal in the form of axial movement of the control rod to the upper extreme working position or back from this position to the lower extreme initial state, in addition, the drive shaft is equipped with a locking element that excludes axial movement of the shaft and restricting its rotation angle, and is made in the form of a cylindrical pin radially and cantilevered in the hole of the shaft, the butt end of which is included in the profiled groove of the side surface of the housing,

according to the invention, the valve body with the inlet and outlet sections for the passage of the working medium is made in the form of a monolithic structure, and the central vertically located bore of the body is made stepwise with the formation of a cylindrical surface, a main seat and two annular cylindrical grooves forming in interaction with the main locking body closed annular cavity of the input and output of the working fluid, and the housing is structurally and functionally made in symmetry horizontal horizontally oriented arrangement of the inlet and outlet sections, including lateral radial channels that directly connect the annular grooves of the inlet and outlet of the central housing bore with the corresponding holes of the inlet and outlet sections, while the shut-off main valve is formed in the form of coaxially placed in the central stepped bore of the housing and the guide cylinder of two pneumatically connected and sequentially interacting automatic control devices the main and auxiliary locking elements with locking elements of the valve-saddle type, with a common command pressure chamber placed between these devices with the possibility of communicating it through a throttle with a source of incoming pressure, the control device of the main locking body consists of a housing with a main saddle, with ring inlet and outlet cavities separating these cavities of the main locking element with a conical sealing part, and coaxially fixed to the guide cylinder body, while the main locking the body is spring-loaded with respect to the opposite supporting end face and is made in the form of a multi-stage cylindrical differential hollow sleeve with an external annular profiled injection groove and a seal on the external mounting surface — the larger stage, with a conical locking part — on the middle stage, with an axial outer centering protrusion forming a smaller stage from the side of the conical sealing part, with an internal through multi-stage bore, in the lower stage of which it is rigid and tight an adapter sleeve is installed with an external supporting annular collar and with an internal through-step bore, a saddle and an annular collector groove are formed in the transition section of the guide bore of the larger stage to the lower stage, which forms a command pressure chamber and interacts with the external annular profiled groove when interacting with the auxiliary shut-off element injection through radially directed throttling channels, and a rigid and tight connection of the adapter sleeve with the main The body was made by installing it with a guaranteed axial interference, excluding axial movements or rotations in any directions, the main locking element being installed with the possibility of limited reciprocating movement in the guide bores of the stationary cylinder and the housing and tight contact and interaction of the conical locking part with the input saddle annular grooves of the body, while the centering protrusion of the main locking body is made in the form of two adjacent sections of different diameters, from A portion of a smaller diameter is located on the side of the conical sealing part and is formed in the form of an annular groove with the possibility of communication with the central through channel through radially oriented passage holes, and the portion of the larger step is formed in the form of an annular double-side ledge (shoulder), on the peripheral guide surface of which longitudinal through semi-cylindrical boring evenly located in the circumferential direction with dividing jumpers - centering elements with possible the possibility of constant communication between the annular groove and the annular cavity of the housing exit between each other, moreover, on the outer surface of the ledge near the edge of the groove, an annular filler is additionally formed by local expansion of the inner cavity in the form of a trapezoidal groove with metal filled with antifriction, wear-resistant and non-corrosive properties applied , for example, by electrode or plasma-powder surfacing.

The control device for the auxiliary locking member is structurally formed as an independent assembly unit with the possibility of limited axial movement inside the enclosing guide bore of the adapter sleeve of the main locking member and communicating internal cavities with the command pressure chamber, the device comprises a housing made in the form of a cylindrical sleeve inside which is aligned with the outer surface formed end guiding bores, between which a partition is formed with a through hole On the one hand, on one side of the partition there are placed spring-loaded plunger and control rod, which are gaplessly interconnected, with the possibility of limited reciprocating movement in the control mode, on the other hand, an auxiliary locking element is made, made with an external annular double-side ledge and a cylindrical guide part with uniformly located and directed parallel to the central axis of the flats and with its transition into a section with a conical sealing surface, and the specified section of sleep It is coated with an axial shank of a cylindrical shape coaxially brought into the zone of the central outlet channel of the working medium of the main locking element, while the auxiliary locking element is installed in the bore of the sleeve with a guaranteed annular gap and with the possibility of simultaneous contact of the peripheral surface of the guide part, the conical sealing surface and the open end of the double-sided ledge with the corresponding surfaces of the main locking element and the spherical end surface of the valve stem, than the axial shank of the locking member is oriented in the central channel of the adapter sleeve of the main locking member with a guaranteed annular clearance for the passage of the working medium, moreover, the guide bores of the sleeve are equipped with annular grooves with a rectangular cross-section made in areas adjacent to the open ends, and the connection node of the device control auxiliary locking body made in the form of a flat spring retaining rings installed with a guaranteed radial interference in the aforementioned otochkah to limit axial movement of the internal constituent elements of the device, in addition, the valve control stem is provided with an outer annular ledge bilateral developed with the periphery of the end surfaces,

according to the invention, a filtering device is integrated in the valve, in the supply line (input) of the working medium to the auxiliary locking element — a means for cleaning the working medium of mechanical impurities (particles), located in the outer annular profiled injection channel of the main locking element, the filtering device is made in the form of a prefabricated composite a design consisting of a set of at least one layer of a filter mesh in the form of a tape and two spring-loaded flat mesh rings compressing it on both sides with a patch ohm and with a perforation belt of through holes, the constituent elements of the filtering device tightly crimped along the contour of the bottom of the injection groove and additionally fixed in radial and circumferential directions by, for example, laser welding or soldering of a peripheral mesh ring, while the outer surface of the filtering device is in communication with the annular the cavity of the working medium inlet into the valve, and the internal cavity with the command pressure chamber, according to the invention, the working sealing surfaces of the seat bodies a and the main locking body are made conical and ground to the corresponding working conical surfaces of the main and auxiliary locking bodies, each of the sealing surfaces forming a lateral surface of a truncated cone, coaxially located relative to the corresponding guide bore, facing a smaller base towards the outlet channel, while the angle of the truncated the cone of the saddle and the corresponding conical part of the locking element are made with equal values in the range from 45 ° to 52 ° and the ratio of the height of the truncated cone of the saddle to the diameter of its output channel is selected in accordance with the ratio:

Nuk / Dvk = 0.06 ... 0.1,

where Nuk - the height of the truncated cone of the saddle, mm;

Dвк - diameter of the outlet channel of the saddle, mm,

according to the invention, the diameters of the mating of the main locking body with a fixed guide cylinder and with a housing along the valve seat are selected in accordance with the ratio:

Dрц / Dск = 1.16 ... 1.22,

where Dрц is the sealing diameter of the inner bore of a motionlessly fixed guide cylinder, mm;

Dsk - diameter of the sealing edge of the valve body seat, mm,

according to the invention, the outer seal of the mounting surface of the main locking member is formed in the form of a lip seal built into the annular rectangular groove, while the lip seal is made in the form of an elastic rubber round ring placed in the groove with a preload and a cuff made of polymer antifriction material having a radial U-shaped section and installed in the groove with the possibility of simultaneous contact and interaction with its surface generators and with the surface of the inner bore of the guide cylinder and the elastic rubber ring, while the diameter of the inner bore of the guide cylinder is selected for the initial outer diameter of the shell, according to the invention, the main structural elements of the valve are the body, the main locking member, the guide cylinder is made of antimagnetic and corrosion-resistant material, for example, from stainless steel 12X18H10T, and the areas of the sealing surfaces of the saddle of the body and, accordingly, of the main locking element are formed by electrode or plasma continuously-cored welding, resistant to corrosion, erosion and galling, with subsequent hardening by heat treatment to an average hardness values, wherein the valve guide cylinder mirror subjected to galvanic hard chromium plating honing and polishing a work surface.

The proposed technical solution has several advantages compared to the analogue of the prototype and other well-known solutions that ensure the achievement of the goal - improving the reliability, technical, economic and operational indicators of the shut-off electro-pneumatic valve.

A distinctive feature of the proposed valve is that its main components, interacting with each other, automatic control devices for the main and auxiliary locking elements together with the control rod (pusher) and actuator, are structurally and functionally combined into a single modular unit with horizontally oriented intake and exhaust sections working environment.

The proposed design determines:

- the ability to easily integrate the shutoff valve directly into the line of the main system;

- the possibility of autonomous testing of operating parameters;

- Convenient technical inspections and repair work;

- achieving a high degree of tightness and the minimum permissible overflows in the closing mode of locking elements under conditions of high temperatures and pressure drops of the working medium due to the use of metal-metal seals and a filter device in the supply line to the auxiliary locking body and conical sealing surfaces , contributing to the self-centering of the locking organs in the process of working relative to their saddles.

The formation of an external centering protrusion in the main locking body from the location of the sealing locking part with the possibility of constant contact with the housing bore guides provides better mounting on the saddle and improves the sealing efficiency of the locking part and eliminates the likelihood of pneumatic shock, self-oscillations and valve vibrations during the passage of the working medium, and the formation of a guaranteed annular gap on the outer surface of the two-sided ledge of the auxiliary locking device ana ensures its stable position and a tight contact with the sealing seat of the main body locking surface.

The implementation of the drive mechanism in the form of a single removable command control unit, consisting of an electromagnetic drive with automatically changing power during operation, a backup drive for manually duplicating an electrical signal and a switching alarm unit, allows you to control the shut-off valve both manually and remotely using an electrical signal generated by pressing one of the buttons on the control panel with automatic holding of the locking elements in the open position with the issuance of information about the position of the main locking element in the valve ("open" - "closed") through the remote alarm line.

The use of a rational combination of an elastic rubber ring and a shell-cuff made of a polymer antifriction material, for example, fluoroplastic, as an external seal of the main locking organ, allows minimizing the amount of friction of moving the locking organ and increasing the valve operating life as a whole.

The cylindrical shank of the auxiliary shut-off element, coaxially brought into the zone of the central outlet channel of the main shut-off element, ensures equalization of the circumferential flow unevenness and reduction of pulsations at high flow rates of the gaseous medium.

The implementation of the basic structural elements of the valve body, the main locking element and the guide cylinder of anti-magnetic and corrosion-resistant steel, for example, steel 12X18H10T, determines:

- high valve resistance to aggressive environments,

- reducing the effect of inductance on the operation of the electromagnetic drive.

In general, the proposed technical solution is caused by the need to ensure the compactness of the inventive valve placement both in simple main and technological gas lines or systems, and in main lines with an automatic system for controlling the flow of the working medium with the issuance in both cases of information about the position of the main shutoff body and ease of maintenance and connecting to it the corresponding supply pipelines.

The essence of the invention is illustrated by drawings, where

- figure 1 shows a General view, sectional view of a redundant shutoff main electro-pneumatic valve of modular design for integrated installation, high pressures and temperatures with two sequentially interacting automatic devices 53 and 54 for controlling the main 7 and auxiliary 10 locking elements with a removable command control unit 15 There are no electrical control signals;

- figure 2 shows the place And figure 1 - structural design of the saddle 9 of the main locking element 7;

- figure 3 shows the place B in figure 1 - structural design of the external sealing device 60 of the main locking element 7;

- figure 4 shows a section FJ in figure 1 - structural design of the annular bilateral ledge (shoulder) 73 of the main locking body 7 with external, longitudinal, through, uniformly located in the circumferential direction, half-cylindrical bores 74 for the passage of the working medium in the direction annular cavity exit 5;

- figure 5 shows the place In figure 1, a section of a removable command control unit 15 - the drive mechanism for the auxiliary 10 and the main 7 locking bodies;

- figure 6 shows the place G in figure 1, a section of an automatic device 54 for controlling the auxiliary locking member 10;

- Fig.7 shows a General view, sectional view of a redundant shutoff main electro-pneumatic valve of modular design for integrated mounting, high pressures and temperatures with two sequentially interacting automatic devices 53 and 54 for controlling the main 7 and auxiliary 10 locking elements with a removable command control unit 15 The electrical control signals are supplied to the electromagnetic drive 11 of the control unit 15;

- Fig. 8 shows a general view, sectional view of a redundant shutoff main electro-pneumatic valve of modular design for built-in installation, high pressures and temperatures with two sequentially interacting automatic devices 53 and 54 for controlling the main 7 and auxiliary 10 locking elements. There are no electrical control signals.

The drive shaft 42 of the backup drive fixed manual duplication of the electrical signal 14 is rotated from its original position to the position "OPEN" at an angle of 180 ° ... 190 °. Auxiliary 10 and main 7 locking bodies are kinematically brought into open positions.

The redundant shutoff main electro-pneumatic valve of modular design for built-in installation, high pressures and temperatures (shut-off valve) (Fig. 1) contains a housing 1 with inlet 2 and 3 exhaust sections for the passage of the working medium, communicating with each other through the inner ring 4 inlet cavities 4 separating them and exit 5 with a central vertically located stepped cylindrical bore 6 and coaxially placed in it by two successively open spring-loaded locking elements - the main locking body 7, made integral with the control piston 8 and located with the possibility of axial movement relative to the guiding bore and interacting with the seat 9 (figure 2) of the housing 1, and an auxiliary locking body 10 formed with reduced geometric parameters compared to the main locking body 7 , and an electromagnetic actuator 11 controlling through the control rod 12 an auxiliary locking member 10.

The shut-off valve, which includes a housing 1, a main 7 and an auxiliary 10 shut-off bodies with a control rod 12, is equipped with a removable guide cylinder 13 for the main shut-off element 7 and a drive mechanism consisting of an electromagnetic drive 11 and a backup drive 14 of a fixed manual duplication of the electrical signal.

Both drives are kinematically connected with the control rod 12 of the shutoff valve and are structurally and functionally combined into a single removable command control unit 15 and are rigidly connected by a common housing 16 and a cover of the magnetic circuit 17. In the housing 16 (Fig. 3), a central vertically located a through multistage bore 18 with a threaded section 19 and a guide cylindrical surface 20 for tight and coaxial connection of the control unit 15 to the guide cylinder 13.

A guide sleeve 22 of non-magnetic and antifriction material with an outer annular support collar 23 and a stop 24 of soft magnetic material with a central hole 25 is rigidly mounted in the small step 21 of the central bore 18. The cavities of the power supply 26 are formed on the outer side of the middle part of the housing 16, and on the side the surface of the central bore 27 is a radially directed boring hole 28.

The electromagnetic drive 11 comprises two electromagnetic coils placed coaxially in the cover of the magnetic circuit 17, the central one of them, 29 pulsed, the other 30 with a peripheral arrangement configured as a "holding" coil with lower output power.

Inside the guide sleeve 22 there is a spring-loaded anchor-core 31, rigidly connected with the control rod 12 of the valve and the rod of the end position indicator 32 of the main locking element 7, located axisymmetrically to the control rod 12 and equipped with a permanent magnet 33. The electromagnetic drive 11 is equipped with a signaling and switching unit 34, including a tubular housing 35, in the upper part of which a switching unit with three reed switches 36, 37 and 38 is fixed. A lantern 39 is installed in the upper zone of the cover of the magnetic circuit 17, and inside the lantern Board 40 with light-emitting diodes 41 of various colors is tinted.

The drive of fixed manual duplication of the electrical signal 14 is made in the form of a drive shaft 42 housed in the lateral bore 28 of the housing 16 with sealing elements 43 and the handle 44. The kinematic connection between the drive 14 of the fixed manual duplication of the electrical signal and the control rod 12 is made in the form formed on the end wall 45 of the drive shaft 42 of the pushing pin 46 with the possibility of entering into engagement with the end surface 97 of the annular two-sided ledge 96 of the control rod 12. When One shaft 42 is provided with a locking element in the form of cylindrical radially and cantilevered pin 47 installed.

The central vertically located bore 6 of the housing 1 (Fig. 1) is made stepwise with the formation of a cylindrical guide surface 48, the main seat 9 (Fig. 2) and two annular cylindrical grooves 49 and 50 in the smaller step section, which, when interacting with the main locking member 7 closed annular cavities of the inlet 4 and the outlet 5 of the working medium in communication with the portions of the inlet 2 and the outlet 3 through channels 51 and 52, respectively.

The shut-off main valve is formed in the form of two pneumatically connected and sequentially interacting automatic control devices, coaxially placed in the central stepwise bore 6 of the housing 1 and the guide cylinder 13: 53, by the main shut-off element 7 and 54, by the auxiliary shut-off element 10. Between the control devices 53 and 54 there is a common command pressure chamber 55 (Fig. 6), communicated through throttle openings 56 with a source of control pressure through an annular cavity of inlet 4 and inlet channel 51 (f ig. 1).

The control device 53 of the main locking element 7 (Fig. 1) consists of a housing 1 with a main seat 9 (Fig. 2) with annular cavities of the inlet 4 and the outlet 5, separating these cavities of the main locking organ 7 with a conical sealing part 57, and coaxially fixed with the housing 1 of the guide cylinder 13, while the main locking member 7 is spring-loaded with respect to the opposing supporting end face 58 and is made in the form of a multi-stage cylindrical differential hollow sleeve with an outer annular profiled discharge groove 59 (FIG. 6) and a seal 60 (FIG. 3) on the outer mounting surface of the larger stage 61, with a tapered locking part 57 on the middle stage 62 and with an axial outer centering protrusion 63 forming a smaller stage of the main locking member 7 (FIG. 1).

Inside the main locking member 7, a through multi-stage bore 64 is formed, in the middle stage of which the adapter sleeve 65 is rigidly and hermetically mounted with an outer supporting annular collar 66 and with an internal through-step bore 67. A saddle 68 is formed in the transition section of the larger stage to the smaller one (Fig. 6 ) and an annular collector groove 69, which forms, when interacting with an auxiliary locking member (pilot) 10, a command pressure chamber 55 and its connection with the outer annular profiled discharge groove 59 of the main locking member 7 through radially directed throttling channels 56.

The main locking element 7 (figure 1) is installed with limited reciprocating movement in the guide bores of the stationary cylinder 13 and the housing 1 and tight contact and interaction of the conical locking part 57 with the seat 9 (figure 4) of the input annular groove 49 of the housing 1, the centering protrusion 63 of the main locking member 7 is made in the form of two adjacent sections of different diameters, the smaller diameter section is formed in the form of an annular groove 70 with the possibility of communication with the Central through channel 71 through flush oriented passage openings 72, and the section of the larger step is formed in the form of an annular double-sided ledge 73, on the peripheral guide surface of which longitudinal through, semi-cylindrical bores (recesses) 74 (FIG. 4) are formed with separating jumpers - centering elements 75 with the possibility of constant communication of the cavity of the annular groove 70 (figure 1) and the annular cavity of the exit 5 of the housing 1 to each other.

An annular groove 76 with electrode and plasma-powder cladding 77 is additionally formed on the outer surface of the step 73. The control device 54 of the auxiliary locking member 10 (Fig. 6) comprises a housing made in the form of a cylindrical sleeve 78, inside of which end-guiding bores are formed coaxially with the outer surface 79 and 80, between which a partition 81 is formed with a through hole 82. In the bore 79, a spring-loaded plunger 83 and control rod 12 axially axially interconnected are arranged axially displacement. An auxiliary locking element 10 is placed in the bore 80, made with an outer annular double-sided ledge 84 and a cylindrical guide portion 85 with flats 86 evenly spaced parallel to the central axis and passing to a section with a conical sealing surface 87, which is provided with an axial shaft 88 of cylindrical shape brought to the zone of the central outlet channel of the adapter sleeve 65.

Auxiliary locking element 10 is installed in the bore 80 of the sleeve 78 with a guaranteed annular gap 89 and with the possibility of simultaneous contact of the guide part 85, the conical step 87 and the open end 90 of the two-sided step 84 with the corresponding surfaces of the adapter sleeve 65 and the spherical end surface 91 of the control rod 12. Axial the shank 88 of the locking element 10 is aligned coaxially in the Central channel of the adapter sleeve 65 with a guaranteed annular gap 92.

The guide bores 79 and 80 of the sleeve 78 are provided with annular grooves 93 and 94, and the connection unit of the control device 54 of the auxiliary locking member 10 is made in the form of flat spring retaining rings 95 installed with guaranteed radial interference in the grooves 93 and 94 with the possibility of limiting axial movements of internal components elements, auxiliary locking element 10, the plunger 83 and the control rod 12. The control rod 12 is equipped with an annular two-sided ledge 96 (figure 3) with end surfaces 9 developed to the periphery 7 and 98.

In the outer annular profiled injection groove 59 (FIG. 6) of the main locking member 7, a filter device 99 is built-in, consisting of a filter mesh 100 in the form of a tape and two spring flat mesh rings 101 compressing it on both sides with a perforation belt of through holes 102. The outer mesh ring 101 is fixed by laser welding 103.

The working sealing surfaces of the saddle 9 (FIG. 2) of the housing 1 and the saddle 68 (FIG. 6) of the main locking member 7 are conical and ground to the corresponding working conical surfaces of the main and auxiliary locking members 7 and 10, respectively. Each of the sealing surfaces forms a lateral surface of a truncated cone.

The outer seal 60 (Fig. 3) of the mounting surface of the main locking member 7 is formed in the form of a lip seal embedded in an annular rectangular groove 104. The lip seal consists of a rubber round ring 105 and a lip seal 106 of a polymeric antifriction material, for example fluoroplastic, having in a radial section, a U-shaped form installed in the groove 104 with the possibility of simultaneous contact and interaction of its forming surfaces 107 and 108 with the surface of the inner bore I direct its cylinder 13 and the elastic rubber ring 105. The inner cavity of the valve under pressure, sealed against the environment corresponding rings and gaskets.

Redundant shutoff main electro-pneumatic valve operates as follows.

In the initial operating state. The valve in the inlet channel 51 is supplied with the nominal operating pressure from the source of the main gas system. There is no electrical control signal. The valve is closed. Manual drive 14 is in the "CLOSED" position. Closed contact lower reed switch 36 closed position (figure 1).

The working pressure through the inlet channel 51, the annular cavity of the inlet 4 of the housing 1, the filter device 99 and the throttle apertures 56 of the main shut-off element 7 enters the command pressure chamber 55 (Fig. 6), from where, through the formed flats 86 and axial holes in the auxiliary shut-off organ 10 passes into the internal cavity of the control devices 53 and 54 of the main and auxiliary locking organs. Thus, the pressure of the working medium in the internal cavities of the control devices 53 and 54 is equal to the inlet pressure. Due to the fact that the area of the guide and the sealed part 61 of the main locking member 7 is larger than the area of the saddle 9 (Fig. 2) of the housing 1, which is closed by the main locking member 7, the latter moves toward the location of the output channel 52 and closes the saddle 9 with force, proportional to the difference of the above areas, excluding the flow of the working medium under pressure into the annular cavity of exit 5.

At the same time, the auxiliary locking member 10 is pressed against the seat 68 (FIG. 6) of the main locking member 7 by working pressure, excluding the overflow of the working medium under pressure through the central outlet channel 71 (FIG. 1). The main 7 and auxiliary 10 locking elements are additionally pressed against their seats by compression springs installed in the internal cavities of the control devices 53 and 54.

The integration of the filtering device 99 (Fig. 6) into the main locking element 7 in the line for supplying the working medium to the auxiliary locking body 10 prevents contamination of the throttle openings (channels) 56 when the working medium passes through them and excludes the entry of suspended impurity particles into the contact annular closing zone auxiliary locking body 10, which ensures minimizing overflows of the working environment in the conditions of its possible contamination in operating conditions. The circulation of the working medium cleaned from impurities simultaneously eliminates the possibility of pinching and jamming of the moving parts of the auxiliary control device 54 (Fig.6) and the electromagnetic drive 11 (Fig.1).

In the pumping mode through the valve of the working medium under pressure. The valve in the inlet channel 51 is supplied with the nominal operating pressure from the source of the main gas system. An electromagnetic control signal is supplied to the electromagnetic drive 11 (into the "pulse" coil 29 and the "hold" coil 30). The drive manual backup 14 (handle 44) is in the "CLOSED" position (Fig.7).

Under the action of the electric control signal, the core armature 31 is retracted (moves upward according to the scheme) together with the control rod 12 connected thereto, overcoming the force of the control device springs 53 and 54. Synchronously, the cylindrical sleeve 78 of the control device 54 moves in the same direction along with auxiliary locking body 10, which departs from the seat 68 of the main locking body 7 (Fig.6), while the internal cavity above the locking body 7 is connected through the Central channel 71 (Fig.1) with an annular cavity exit a 5.

Due to the throttle holes 56 (Fig.6), the passage sections of which can be selected sufficiently small, there is a sharp drop in pressure in the internal cavity of the main locking element 7, which causes it to rise to the working stroke due to the emergence of a buoyant force from the entrance acting in the annular cavity 4 (figure 1) pressure of the working environment.

The main flow of this medium under pressure through the saddle 9, an annular groove 70 (Fig. 1), half-cylindrical bores 74 (Fig. 4) of the main locking member 7, and an annular cavity 5 (Fig. 1) of the housing 1 are directed to the working medium exit channel 52. After the main locking element 7 passes the working stroke, and with it the traction of the end position indicator 32 (figure 5) with the magnet 33, the lower reed switch 36 of the closed valve position is opened, and the upper reed switch 37 is closed, which forms the electric and light signals about opening shutoff valve. At the same time, the switching reed switch 38 (Fig. 5) of the signaling and switching unit 34 is opened with magnet 33, thereby turning off the pulse coil 29, while the “holding” coil 30 remains energized with less power consumption, but sufficient to hold the shut-off elements 7 and 10 in open state.

To close the valve, the "holding" coil 30 is turned off, while the locking elements 7 and 10 are returned to their original closed position, stopping the flow of the working medium through the valve. Thus, a two-stage mode of operation of the shut-off valve is carried out.

In cases of manual control of the opening of the shut-off valve (Fig. 8), the handle 44 of the drive for manually duplicating the electric signal 14 is rotated in the "OPEN" direction by an angle of 180 ° ... 190 ° to the stop, while the lateral, eccentrically pushing pin 46 of the drive shaft 42, enters into contact with the end surface 97 of the two-sided ledge 96 of the control rod 12 and moves it in the direction of the location of the electromagnetic actuator 11 by the magnitude of the stroke of the main locking element 7, equal to the double eccentricity p memory location of the pushing finger 42. Further process occurs as described above, when the opening of the shutoff valve is performed by an electromagnetic actuator 11 by supplying a control electric signal.

The proposed shut-off valve with the claimed combination of essential design features determines the technical result — the possibility of creating a promising series of redundant shut-off main electro-pneumatic shut-off valves of modular design for built-in installation, which are distinguished by operational reliability, durability, high tightness, safety and an expanded area of use as part of automatic devices for trunk gas systems as well as self USAGE inlet gas processing equipment medium and high power, and due to the possibility of locking the control valve body both manually and remotely using electrical signals generated by the control panels with the necessary information about the issuance of the valve through the remote signaling line.

The inventive shut-off valve provides a reduction in power consumption by more than an order of magnitude in comparison with the known designs of electro-pneumatic valves and guarantees trouble-free operation in a wide range of flow rates, pressures, temperatures and applied working media, including aggressive media, while the advantageous indicators over the known technical solutions have been practically confirmed with a fairly simple structural and technological design of the proposed valve, which opens up the possibility the implementation of a more convenient and economical operation of electro-pneumatic valves as a part of the main pipeline or technological lines or other application objects.

Claims (7)

1. The redundant shutoff main electro-pneumatic valve of modular design for built-in installation, high pressures and temperatures, comprising a housing with inlet and outlet sections for the passage of the working medium, communicating with each other through inner ring cavities separating them, with a central vertically located stepped cylindrical bore and coaxially placed in it two successively opened spring-loaded locking bodies - the main locking body (main valve), performed at the same time with the control piston and located with the possibility of axial movement relative to the guiding bore and interacting with the body seat, and an auxiliary locking element (pilot valve) formed with reduced geometrical parameters compared to the main locking element, and an electromagnetic drive controlling through the control rod ( pusher) auxiliary locking body, characterized in that the shutoff main electro-pneumatic valve (valve), which includes a housing, the main auxiliary locking elements, equipped with a removable guide cylinder for the main locking element and the drive mechanism and is formed as a single block module with the ability to be integrated directly into the trunk line and is made with a redundant workflow control system configured with the possibility of selective valve operation in remote control modes and control with fixed manual duplication of the electric signal with the common remote and local signaling circuits by gender When the main locking element in the valve is closed-open, the drive mechanism of the auxiliary and, accordingly, the main locking organs is formed in the form of a connecting device of two component components - an electromagnetic drive and a backup drive of fixed manual duplication of the electrical signal, both drives are kinematically connected with the control valve of the shut-off valve and are structurally and functionally combined into a single removable command control unit and are rigidly connected by a common housing and with the handle of the magnetic circuit, in the body of the command control unit for installing an electromagnetic drive, a central vertically located through multistage bore with a threaded section and a guide cylindrical surface is formed for tight and coaxial connection of the command control unit to the guide cylinder of the shut-off valve, a guide sleeve is rigidly installed in the small step of the central bore of the case with an outer ring support collar of antimagnetic antifriction material with a stop made of soft magnetic material with a central hole, on the outer side of the middle part of the body are formed the cavity of the power supply inlets, and on the side surface of the central bore there is a radially directed through boring hole, while the electromagnetic drive contains two electromagnetic coils placed coaxially in the cover of the magnetic circuit, the central one of which is formed with the function of "pulse" (starting) coil with short-term (pulse) mode of operation, the other with a peripheral arrangement, implemented by "holding" coil with continuous operation with less power consumption and power output, the currents consumed for opening the shut-off valve bodies and holding them open mode of operation selected in accordance with the relation
Jimp / J hold = 10 ... 16,
where Jimp is the current consumption at the start of the valve opening in the pulse control mode, A,
Juder - the consumed current that keeps the locking elements in the open state in the long-term operation mode, A,
a spring-loaded core anchor installed inside the guide sleeve rigidly connected to the valve control rod and the rod of the end position indicator of the main locking element, located axisymmetrically to the control rod and equipped with a permanent magnet, an alarm and switching unit for automatically switching off the pulse coil when the main locking element reaches the upper position and transmitting information about the valve status (“open” - “closed”) to the control panel, the alarm and switching unit includes It is a tubular housing, in the upper part of which a switching unit with three reed switches is fixed, a lamp made of light-transmitting and shock-resistant material is installed in the upper area of the magnetic circuit cover, a board with light-emitting diodes of various colors is mounted inside the lamp, the drive for fixed manual duplication of the electrical signal is made in the form of a guide side boring of the housing of the drive shaft control unit with ring sealing elements on the outer cylindrical surface and handle with the possibility of limited rotation of the shaft in the horizontal plane at an angle of 180 ... 190 °, and the specified kinematic connection of the drive of a fixed manual duplication of the electrical signal with the control rod of the shut-off valve is made in the form of a pushing finger with an eccentric arrangement relative to the front side of the drive shaft end wall pivot axis with the possibility of engagement with the end face of the annular double-sided ledge of the rod at the step of manual control control and forming a trigger signal in the form of axial movement of the control rod to the upper extreme operating position or back from this position to the lower extreme initial state, in addition, the drive shaft is equipped with a locking element that excludes axial movement of the shaft and restricts its rotation angle, and is made in the form of a cylindrical a pin radially and cantileverly fixed in the hole of the shaft, the free end of which enters the profiled groove of the side surface of the housing. 2. The redundant shutoff main electro-pneumatic valve according to claim 1, characterized in that the valve body with inlet and outlet sections for the passage of the working medium is made in the form of a monolithic structure, and the central vertically located bore of the body is made stepwise with the formation of a guide cylindrical surface in the section of a lower stage , the main saddle and two annular cylindrical grooves, which, when interacting with the main locking body, form closed annular cavities of entry and exit the body, and the housing is structurally and functionally made according to a symmetrical horizontally oriented arrangement of the inlet and outlet sections, including lateral radial channels that directly connect the annular grooves of the inlet and outlet of the central bore of the housing with the corresponding holes of the inlet and outlet sections, while the shut-off main valve is formed in in the form of two pneumatically connected and subsequently aligned the automatic control devices of the main and auxiliary locking elements interacting with each other with locking elements of the "valve-seat" type, with a common command pressure chamber placed between these devices with the possibility of communicating it through a throttle with a source of incoming pressure, the control device of the main locking body consists of housing with a main saddle, with annular cavities of input and output, separating these cavities of the main locking body with a conical sealing part and coax but fixed to the body of the guide cylinder, while the main locking element is spring-loaded with respect to the opposite supporting end and is made in the form of a multi-stage cylindrical differential hollow sleeve with an external annular profiled injection groove and a seal on the external mounting surface - a larger stage, with a conical locking part - on the middle steps, with an axial outer centering protrusion forming a smaller step from the side of the conical sealing part, with an internal through With a multistage bore in a lower stage, the adapter sleeve is rigidly and hermetically mounted with an external supporting annular collar and with an internal through-step bore, a saddle and an annular collector groove are formed in the transition section of the guide bore of the larger stage to the lower stage, which forms a chamber when interacting with the auxiliary locking member command pressure and its connection with the outer annular profiled injection groove through radially directed throttling channels ala, and the rigid and tight connection of the adapter sleeve with the main locking element is made by installing it with a guaranteed axial interference, excluding axial movements or turning in any directions, the main locking element being installed with the possibility of limited reciprocating movement in the guiding bores of the fixed cylinder and the housing and tight contact and interaction of the conical locking part with the seat of the inlet annular groove of the housing, while the centering protrusion of the main locking The organ is made in the form of two adjacent sections of different diameters, of which the smaller diameter section is located on the side of the conical sealing part and is formed in the form of an annular groove with the possibility of communication with the central through channel through radially oriented passage openings, and the section of the larger step is formed in the form of an annular bilateral ledge (collar), on the peripheral guide surface of which are formed longitudinal through half-cylinders evenly located in the circumferential direction bores with separating jumpers - centering elements with the possibility of constant communication between the annular groove and the annular cavity of the housing exit between each other, moreover, on the outer surface of the ledge near the edge of the groove, an annular filler is additionally formed by local expansion of the inner cavity in the form of a trapezoidal groove with metal filling in it with anti-friction, wear-resistant and non-corrosive properties, applied, for example, by electrode or plasma-powder coating avki, the control device for the auxiliary locking member is structurally formed as an independent assembly unit with the possibility of limited axial movement inside the enclosing guide bore of the adapter sleeve of the main locking member and communicating internal cavities with the command pressure chamber, the device comprises a housing made in the form of a cylindrical sleeve inside which is coaxially end-guiding bores are formed with the outer surface, between which a partition with a squaw is formed With a hole, on one side of the partition there are placed spring-loaded plunger and control rod that are gaplessly interconnected with the possibility of limited reciprocating movement in the control mode, on the other hand there is an auxiliary locking element made with an external annular two-side ledge and a cylindrical guide part with evenly spaced and directed parallel to the central axis of the flats and with its transition to a section with a conical sealing surface, the current is equipped with an axial shank of a cylindrical shape coaxially brought into the zone of the central outlet channel of the working medium of the main locking element, while the auxiliary locking element is installed in the bore of the sleeve with a guaranteed annular gap and with the possibility of simultaneous contact of the peripheral surface of the guide part, the conical sealing surface and the open end of the double-sided ledge with the corresponding surfaces of the main locking element and the spherical end surface of the valve stem ana, and the axial shank of the locking element is oriented in the central channel of the adapter sleeve of the main locking element with a guaranteed annular gap for the passage of the working medium, in addition, the guide bores of the liner are equipped with annular grooves with a rectangular cross-section made in areas adjacent to the open ends, and the assembly the connection of the control device of the auxiliary locking member is made in the form of flat spring retaining rings installed with a guaranteed radial interference in the aforementioned bored grooves with the possibility of limiting axial displacements of the internal constituent elements of the device, in addition, the valve control rod is provided with an external annular double-sided ledge with end surfaces developed towards the periphery. 3. The redundant shutoff main electro-pneumatic valve according to claim 2, characterized in that a filter device is integrated in the valve, in the supply line (input) of the working medium to the auxiliary shut-off element, a means for cleaning the working medium of mechanical impurities (particles), located in the outer annular to the profiled injection channel of the main locking member, the filtering device is made in the embodiment of a prefabricated composite structure consisting of a set of at least one layer of a filtering mesh in the form of a tape and two x spring flat mesh rings compressing it on both sides with a patch joint and a perforation belt of through holes, the constituent elements of the filter device being tightly crimped along the contour of the bottom of the injection groove and additionally fixed in radial and circumferential directions by, for example, laser welding or soldering peripherally located mesh ring, while the outer surface of the filter device is in communication with the annular cavity of the inlet of the working medium into the valve, and the inner with the camera command of pressure. 4. The redundant shutoff main electro-pneumatic valve according to claim 1 or 2, characterized in that the working sealing surfaces of the seats of the body and the main locking member are made conical and ground to the corresponding working conical surfaces of the main and auxiliary locking bodies, each of the sealing surfaces forming a side surface truncated cone, coaxially located relative to the corresponding guide bore, facing a smaller base towards the output nal, while the angles of the truncated cone of the saddle and the corresponding conical part of the locking body are made with equal values in the range from 45 to 52 °, and the ratio of the height of the truncated cone of the saddle to the diameter of its outlet channel is selected in accordance with the ratio
Nuk / Dvk = 0.06 ... 0.1,
where Nuk - the height of the truncated cone of the saddle, mm;
Dвк - diameter of the outlet channel of the saddle, mm. 5. The redundant shutoff main electro-pneumatic valve according to claim 1 or 2, characterized in that the diameters of the mates of the main shut-off body with a fixed guide cylinder and with a housing along the valve seat are selected in accordance with the ratio
Dрц / Dск = 1.16 ... 1.22,
where Dрц - sealing diameter of the inner bore of a motionlessly fixed guide cylinder, mm;
Dsk is the diameter of the sealing edge of the valve body seat, mm. 6. The redundant shutoff main electro-pneumatic valve according to claim 1 or 2, characterized in that the outer seal of the mounting surface of the main shutter body is formed in the form of a lip seal built into the annular rectangular groove, while the lip seal is made in the form of a preload fitted in the groove an elastic rubber round ring and cuff - shells made of a polymer antifriction material having a U-shaped in radial section and installed in a groove with the simultaneous contact and interaction of its generatrix surfaces with the surface of the inner bore of the guide cylinder and the elastic rubber ring, while the diameter of the inner bore of the guide cylinder is selected for the initial outer diameter of the shell. 7. The redundant shut-off main electro-pneumatic valve according to claim 1 or 2, characterized in that the main structural elements of the valve are the body, the main shut-off element, the guide cylinder are made of antimagnetic and corrosion-resistant material, for example, stainless steel 12X18H10T, and sections of the sealing surfaces saddles of the body and, accordingly, of the main locking element are formed by electrode or plasma-powder surfacing, resistant to corrosion, erosion and scuffing, followed by hardening of the heat treatment d to medium hardness values, moreover, the mirror of the valve guide cylinder is subjected to galvanic hard chrome plating and honing with polishing of the working surface.

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