CN211738039U - Horizontal bidirectional sealing pilot operated safety valve - Google Patents

Abstract

The utility model relates to a horizontal two-way sealing pilot operated safety valve, belong to the superpressure protection device technical field of million kilowatt level nuclear power unit moisture separator reheater (short for: MSR), sealing performance is good under various operating mode conditions, low to the quality requirement of sealing washer, the cost is reduced, the operating condition is little to the influence of sealing washer, it is simple to maintain, the human cost has been practiced thrift, horizontal structure has been adopted, make the focus reduce, the antidetonation is effectual, including the main valve, a pilot valve, secondary pilot valve and vacuum apparatus, the main valve passes through the intake pipe and is connected with vacuum apparatus and a pilot valve respectively, the installation is established with the main valve to the secondary pilot valve, a pilot valve is connected with the secondary pilot valve.

Description

Horizontal bidirectional sealing pilot operated safety valve

Technical Field

The utility model relates to a horizontal two-way seal pilot operated safety valve belongs to the superpressure protection device technical field of million kilowatt level nuclear power unit moisture separator reheater (shortly: MSR).

Background

The existing MSR pilot operated safety valve adopts a vertical structure, when the MSR is started and stopped (negative pressure working condition), the absolute pressure of the inlet side of the safety valve is close to 0MPa, the outlet side is atmosphere, the absolute pressure is close to 0.103MPa, the pressure of the outlet side is greater than the pressure of the inlet side, under the action of the pressure difference between the outlet side and the inlet side, the valve clack of a main valve tends to be opened, at the moment, the valve clack of the main valve is limited to be opened only by the spring force of the main valve, the negative pressure sealing performance is poor, when the MSR normally runs (positive pressure working condition), the pressure of the inlet side of the safety valve is MSR working pressure, the outlet side is atmosphere, the pressure of the inlet side is greater than the pressure of the outlet side, the MSR pilot operated safety valve of the vertical structure only depends on the pretightening force of the spring of the main, the existing main valve seat is arranged on the inlet side of the main valve body, parts are vertically arranged along the central line direction of the inlet of the main valve body, the shockproof effect is poor, the connection part is easy to loosen in the vibration process, the sealing performance is poor, and the service life is influenced.

In view of the above problems, it is desirable to provide a horizontal two-way sealing pilot operated safety valve to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model provides a horizontal two-way seal pilot operated relief valve, the beneficial effect is that sealing performance is good under various operating mode conditions, and is low to the required quality of sealing washer, the cost is reduced, and high temperature is little to the influence of sealing washer, maintains simply, has practiced thrift the human cost, has adopted horizontal structure, makes the focus reduce, and it is effectual to combat earthquake. A brief summary of the present invention is provided below in order to provide a basic understanding of some aspects of the present invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention.

The technical scheme of the utility model:

a horizontal two-way sealing pilot operated safety valve comprises a main valve, a primary pilot valve, a secondary pilot valve and a vacuum device, wherein the main valve is respectively connected with the vacuum device and the primary pilot valve through an air inlet pipe, the secondary pilot valve is installed with the main valve, and the primary pilot valve is connected with the secondary pilot valve.

Preferably: the main valve comprises an inlet cavity, an outlet cavity, a main valve clack, a main valve rod, a main valve piston bush, a main valve spring, a main valve bonnet, a main valve piston cavity, a main valve plug plate and a main valve piston backpressure cavity, wherein the inlet cavity is fixedly connected with the main valve piston cavity, the main valve piston separates the main valve piston cavity from the main valve piston backpressure cavity, a mounting hole is processed on the main valve bonnet, a secondary pilot valve is communicated with the main valve piston backpressure cavity through the mounting hole, a circular hole is processed in the center of the main valve bonnet, a vacuum device passes through the circular hole on the main valve bonnet to be installed with the main valve rod, the main valve piston bush is installed in the main valve piston cavity and the main valve piston backpressure cavity, the main valve piston is installed in the main valve piston bush in a sliding mode, two ends of the main valve spring, the main valve plug board is installed with the main valve piston cavity, a round through hole is processed in the center of the main valve plug board and the center of the main valve piston, the main valve rod passes through the round through hole processed in the center of the main valve plug board and the center of the main valve piston to contact with the vacuum device, the left end of the main valve rod is fixedly connected with the main valve clack, and the main valve clack is used for opening/closing the outlet cavity.

Preferably: a groove is processed on the main valve piston bushing, a first drainage channel is processed at the joint of the inlet cavity and the main valve piston cavity, and the first drainage channel is communicated with the inlet cavity and the groove.

Preferably: the primary pilot valve comprises a primary valve inlet cavity, a primary valve clack, a primary valve locking sleeve, an adjusting nut, a primary valve rod, a first valve cover, an inserting rod, a second valve cover, a wrench, a primary valve spring mechanism, an auxiliary valve body, an auxiliary valve cap, an auxiliary valve rod, a safety rope lock, a primary valve outlet cavity, a primary valve body and a stop block, wherein the second valve cover is detachably installed on the side surface of the primary valve body, the first valve cover is detachably installed above the primary valve body, the primary valve locking sleeve is fixedly installed in the primary valve body, the primary valve clack is slidably installed in the primary valve locking sleeve, the primary valve body is fixedly connected with the primary valve inlet cavity, the primary valve clack is arranged on the upper part of the primary valve inlet cavity, the primary valve clack is installed between the primary valve inlet cavity and the primary valve outlet cavity, the top of the primary valve clack is connected with the primary valve rod, the free end of the primary valve rod penetrates through the primary valve body and, the side wall of the first valve cover is provided with a radial through hole, an insertion rod is arranged in the radial through hole in a penetrating way, the left end of the insertion rod is hinged on the side wall of the first valve cover, a wrench is arranged at the lower side of the insertion rod and is hinged on the side wall of the first valve cover, the wrench is hinged on the left side of the first valve cover, the insertion rod is hinged on the right side of the first valve cover, the top end of the primary valve rod is fixedly connected with a stop block, the insertion rod is provided with a through hole with a diameter larger than that of the primary valve rod and smaller than that of the stop block, the free end of the primary valve rod passes through the through hole on the insertion rod, a primary valve spring mechanism is arranged in the primary valve body, an adjusting nut is in threaded connection with the top of the primary valve body, the upper part of the primary valve spring mechanism is propped against the bottom of the adjusting nut, the primary valve rod passes through the, the bottom of a valve spring mechanism is supported on a stepped shaft of a valve rod, an auxiliary valve body is fixedly mounted on the side face of an outlet cavity of a primary valve, the auxiliary valve rod is in threaded connection with the auxiliary valve body, the auxiliary valve rod is mounted between the outlet cavity of the primary valve and the auxiliary valve body, an auxiliary valve cap is detachably mounted on the auxiliary valve body, and the auxiliary valve cap is connected with a wrench through a safety rope lock.

Preferably: the exhaust pipe is also included, the secondary pilot valve comprises a valve rod with a valve clack, a secondary pilot valve pressure relief cavity, a secondary pilot valve body, a secondary pilot valve spring, a secondary valve piston bush, a secondary valve piston, a backpressure cavity and a secondary valve cover, the secondary pilot valve pressure relief cavity and the backpressure cavity are respectively processed at two ends of the secondary pilot valve body, a round through hole is processed between the secondary pilot valve pressure relief cavity and the backpressure cavity, the valve rod with the valve clack passes through the round through hole to be fixedly connected with the secondary valve piston, the secondary valve piston bush is fixedly installed in the backpressure cavity and is in sliding connection with the secondary valve piston, two ends of the secondary pilot valve spring are respectively fixed on the secondary pilot valve body and the secondary valve piston, the backpressure cavity is communicated with a primary valve outlet cavity, the secondary valve cover is fixedly connected with the secondary pilot valve body, a first groove is processed on the secondary valve piston bush, and a first pilot valve passage, the first groove is communicated with the first passage, the first passage is communicated with the exhaust pipe, the exhaust pipe is communicated with the secondary pilot valve pressure relief cavity, the valve body of the secondary pilot valve is fixedly connected with the valve cover of the main valve, and the left end of the valve rod with the valve clack is arranged in the back pressure cavity of the piston of the main valve.

Preferably: the vacuum device comprises a vacuum rod, a vacuum rod slideway support, a slideway cavity and a vacuum piston, the valve rod of the vacuum cylinder is in sliding connection with the adjusting screw sleeve, the disc spring is sleeved on the valve rod of the vacuum cylinder, the left end of the disc spring is propped against the vacuum piston, the right end of the disc spring is propped against the adjusting screw sleeve, an annular groove is processed on the side wall of the vacuum piston, the O-shaped sealing ring is sleeved in the annular groove of the vacuum piston, the vacuum piston divides the slideway cavity into a left cavity and a right cavity, and the left cavity of the vacuum piston is communicated with the inlet cavity.

The utility model discloses following beneficial effect has:

1. the vacuum device generates pressure on the main valve clack to prevent the main valve clack from being opened by force larger than the elastic force of a main valve spring under the negative pressure working condition to cause leakage, so that the sealing property under the negative pressure working condition is improved;

2. the vacuum device can prevent the valve clack of the main valve from being suddenly opened to influence the normal work when the spring of the main valve fails, can regulate the pressure and manually regulate the pressure of the vacuum device by combining the actual working condition of a site;

3. the O-shaped sealing ring adopts a sealing ring made of a common sealing material, so that the cost is reduced on the premise of ensuring the sealing performance;

4. the primary pilot valve can adjust the flow, the take-off precision of the valve is improved, the primary pilot valve is small in caliber and convenient to maintain, the operation is not influenced even if leakage occurs, a sealing ring is not installed in the primary pilot valve, the use of parts is reduced under the condition that the normal operation of the primary pilot valve is ensured, the cost is saved, a second valve bonnet and a first valve bonnet are installed outside the primary pilot valve, the phenomenon that steam and water mist sprayed out during pressure relief directly contact a human body to cause scalding is prevented, the primary pilot valve can realize action through manual adjustment, and the normal operation is not influenced when a primary valve spring mechanism fails;

5. the parts of the horizontal bidirectional sealing pilot operated safety valve are transversely arranged along the central line direction of the inlet of the main valve, so that the gravity center is reduced, the anti-seismic performance is good, the phenomena of looseness, cracks and breakage at the joint of parts are prevented, the service life of the horizontal bidirectional sealing pilot operated safety valve and other parts on application equipment of the horizontal bidirectional sealing pilot operated safety valve is influenced, the times of maintaining equipment and replacing parts are reduced, the manpower, material resources and financial resources are saved under the condition of not influencing normal work, and the efficiency is improved;

6. the main valve and the secondary pilot valve can automatically discharge the condensed water, and the action accuracy of the valve is ensured.

Drawings

FIG. 1 is a front view of a horizontal two-way seal pilot operated safety valve;

FIG. 2 is a schematic diagram of a primary pilot valve;

FIG. 3 is a schematic diagram of a secondary pilot valve;

FIG. 4 is a schematic view of the structure of the vacuum apparatus;

FIG. 5 is a schematic diagram of a horizontal two-way seal pilot operated safety valve;

FIG. 6 is a top view of a horizontal two-way seal pilot operated safety valve;

in the figure 1-main valve, 101-inlet chamber, 102-outlet chamber, 103-main valve flap, 104-main valve stem, 105-main valve piston, 106-main valve piston bushing, 107-main valve spring, 108-first drainage channel, 109-groove, 110-main valve bonnet, 111-main valve piston chamber, 112-main valve closure plate, 113-main valve piston backpressure chamber, 2-primary pilot valve, 201-primary valve inlet chamber, 202-primary valve flap, 203-primary valve locking sleeve, 204-adjusting nut, 205-primary valve stem, 206-first valve bonnet, 207-insert stem, 208-second valve bonnet, 209-wrench, 210-primary valve spring mechanism, 211-auxiliary valve body, 212-auxiliary valve bonnet, 213-auxiliary valve rod, 214-safety rope lock, 215-primary valve outlet cavity, 216-primary valve body, 217-stop, 3-secondary pilot valve, 301-valve rod with valve clack, 302-secondary pilot valve pressure relief cavity, 303-secondary pilot valve body, 304-secondary valve cover, 305-secondary pilot valve spring, 306-secondary valve piston bush, 307-secondary valve piston, 308-backpressure cavity, 4-vacuum device, 401-vacuum rod, 402-vacuum rod slideway support, 404-slideway cavity, 405-vacuum piston, 406-O-shaped sealing ring, 407-disc spring, 408-vacuum cylinder valve rod, 409-adjusting screw sleeve, 5-air inlet pipe and 6-exhaust pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described below with reference to specific embodiments shown in the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

The utility model discloses the connection that mentions divide into fixed connection and can dismantle the connection, fixed connection (for being undetachable connection) includes but not limited to conventional fixed connection modes such as hem connection, rivet connection, adhesive connection and welded connection, can dismantle the connection including but not limited to conventional dismantlement modes such as threaded connection, buckle connection, pin joint and hinged joint, when not clearly prescribing a limit to concrete connection mode, defaulting always can find at least one kind of connected mode in current connected mode and can realize this function, and the technical staff in the art can select by oneself as required. For example: the fixed connection selects welding connection, and the detachable connection selects hinge connection.

The first embodiment is as follows: the present embodiment is described with reference to fig. 1 to 6, and the horizontal bidirectional sealing pilot operated safety valve of the present embodiment includes a main valve 1, a primary pilot valve 2, a secondary pilot valve 3, and a vacuum device 4, wherein the main valve 1 is connected to the vacuum device 4 and the primary pilot valve 2 through an intake pipe 5, the secondary pilot valve 3 is mounted on the main valve 1, and the primary pilot valve 2 is connected to the secondary pilot valve 3.

The second embodiment is as follows: the present embodiment is described with reference to fig. 1 to 6, and a horizontal two-way sealing pilot operated safety valve of the present embodiment includes a main valve 1 including an inlet chamber 101, an outlet chamber 102, a main valve flap 103, a main valve stem 104, a main valve piston 105, a main valve piston bushing 106, a main valve spring 107, a main valve bonnet 110, a main valve piston chamber 111, a main valve plug 112, and a main valve piston back pressure chamber 113, the inlet chamber being fixedly connected to the main valve piston chamber, the main valve piston 105 separating the main valve piston chamber 111 from the main valve piston back pressure chamber 113, the main valve piston chamber 111 and the main valve piston back pressure chamber 113 having a constant total volume, the main valve piston chamber 111 and the main valve piston back pressure chamber 113 having a volume varying inversely proportional to the pressure, a mounting hole being formed in the main valve bonnet 110, and a secondary pilot valve 3 being connected to the main valve piston back pressure chamber 113 through the mounting hole, the main valve bonnet 110 is formed with a circular hole at the center, the vacuum device 4 is installed with the main valve stem 104 through the circular hole on the main valve bonnet 110, the main valve piston bush 106 is installed in the main valve piston cavity 111 and the main valve piston back pressure cavity 113, the main valve piston 105 is installed in the main valve piston bush 106 in a sliding manner, both ends of the main valve spring 107 are respectively abutted against the main valve piston 105 and the main valve bonnet 110, the main valve plug 112 is installed at the left side of the main valve piston bush 106, the main valve plug 112 is installed with the main valve piston cavity 111, a circular through hole is formed at the center of the main valve plug 112 and the main valve piston 105, the main valve stem 104 is contacted with the vacuum device 4 through the circular through hole formed at the center of the main valve plug 112 and the main valve piston 105, the main valve plug 112 can prevent the main valve stem 104 from being deviated, the main valve stem 104 is fixedly connected with the.

The third concrete implementation mode: the present embodiment is described with reference to fig. 1 and 6, and according to the horizontal bidirectional sealing pilot operated safety valve of the present embodiment, a groove 109 is formed on a main valve piston bushing 106, a first drainage channel 108 is formed at a connection between an inlet cavity 101 and a main valve piston cavity 111, the first drainage channel 108 communicates the inlet cavity 101 and the groove 109, and condensed water in the main valve piston cavity 111 enters the groove 109, flows through the first drainage channel 108, and is finally discharged through the inlet cavity 101, so that the condensed water is effectively prevented from affecting the main valve 1, and the accuracy and the response of the operation of the main valve 1 are ensured.

The fourth concrete implementation mode: the embodiment is described with reference to fig. 1, fig. 2, fig. 5, and fig. 6, and the primary pilot valve 2 of the embodiment includes a primary valve inlet cavity 201, a primary valve flap 202, a primary valve locking sleeve 203, an adjusting nut 204, a primary valve stem 205, a first valve cover 206, an inserting rod 207, a second valve cover 208, a wrench 209, a primary valve spring mechanism 210, an auxiliary valve body 211, an auxiliary valve cover 212, an auxiliary valve stem 213, a safety rope lock 214, a primary valve outlet cavity 215, a primary valve body 216, and a stopper 217, the second valve cover 208 is detachably mounted on a side surface of the primary valve body 216, the first valve cover 206 is detachably mounted above the primary valve body 216, the primary valve locking sleeve 203 is fixedly mounted in the primary valve body 216, the primary valve flap 202 is slidably mounted in the primary valve locking sleeve 203, the primary valve body 216 is fixedly connected to the primary valve inlet cavity 201, the primary valve clack 202 is arranged at the upper part of a primary valve inlet cavity 201, the primary valve clack 202 is arranged between the primary valve inlet cavity 201 and a primary valve outlet cavity 215, a primary valve rod 205 is connected to the top of the primary valve clack 202, the free end of the primary valve rod 205 passes through a primary valve body 216 and is arranged in a first valve cover 206, a radial through hole is arranged on the side wall of the first valve cover 206, an insertion rod 207 penetrates through the radial through hole, the left end of the insertion rod 207 is hinged on the side wall of the first valve cover 206, a wrench 209 is arranged at the lower side of the insertion rod 207, the wrench 209 is hinged on the side wall of the first valve cover 206, the insertion rod 207 is hinged on the right side of the first valve cover 206, a stop block 217 is fixedly connected to the top end of the primary valve rod 205, a through hole with the diameter larger than the primary valve rod 205 and smaller than the stop block 217 is processed on the insertion rod 207, the free end of the primary valve rod 205 passes, a primary valve spring mechanism 210 is arranged in a primary valve body 216, an adjusting nut 204 is connected to the top of the primary valve body 216 in a threaded manner, the upper part of the primary valve spring mechanism 210 is abutted against the bottom of the adjusting nut 204, a primary valve stem 205 slides through the adjusting nut 204, the primary valve spring mechanism 210 and a primary valve locking sleeve 203 and is fixedly connected with a primary valve clack 202, a stepped shaft is arranged on the primary valve stem 205, the bottom of the primary valve spring mechanism 210 is abutted against the stepped shaft of the primary valve stem 205, an auxiliary valve body 211 is fixedly arranged on the side surface of a primary valve outlet cavity 215, the auxiliary valve stem 213 is connected with the auxiliary valve body 211 in a threaded manner, the auxiliary valve stem 213 is arranged between the primary valve outlet cavity 215 and the auxiliary valve body 211, the auxiliary valve cap 212 is detachably arranged with the auxiliary valve body 211, the auxiliary valve cap 212 is connected with a spanner 209 through a safety rope lock 214, the auxiliary valve stem 213 is, thereby adjusting the pressure, controlling the jumping precision of the primary valve clack 202, after the adjustment of the auxiliary valve rod 213 is completed, the auxiliary valve cap 212 is screwed with the auxiliary valve body 211, the auxiliary valve cap 212 is connected with the wrench 209 through the safety rope lock 214 to prevent the auxiliary valve rod 213 from being operated by mistake after the adjustment is completed, under the condition that the primary valve spring mechanism 210 is failed, the safety rope lock 214 is disassembled, because the temperature of the inserted link 207 is too high, the direct contact can cause injury to human body, the wrench 209 is lifted, the wrench 209 pushes the inserted link 207 upwards, the inserted link 207 drives the primary valve rod 205 upwards through the stop block 217, the primary valve rod 205 drives the primary valve clack 202 upwards, the primary valve clack 202 moves upwards along the primary valve locking sleeve 203, the vertical relative displacement of the primary valve locking sleeve 203 and the primary valve clack 202, namely the stroke requirement of the primary pilot valve 2 is not less than 2mm, the primary valve inlet cavity 201 is communicated with the primary valve outlet cavity, the sealing washer is quick-wear part, and life can be shorter under the condition of high temperature, under the condition that does not influence normal work, does not have the sealing washer in the pilot valve 2, has reduced the waste of the manpower and materials that the change sealing washer produced, has reduced the cost of plant maintenance, has promoted work efficiency, and first valve bonnet 206 and second valve bonnet 208 carry out effectual separation with the vapor and the water smoke of leaking, prevent that personnel from being scalded.

The fifth concrete implementation mode: the embodiment is described with reference to fig. 1, fig. 2, fig. 3, fig. 5, and fig. 6, and the horizontal two-way sealing pilot operated safety valve of the embodiment further includes an exhaust pipe 6, the secondary pilot valve 3 includes a valve rod 301 with a valve flap, a secondary pilot valve pressure relief cavity 302, a secondary pilot valve body 303, a secondary pilot valve spring 305, a secondary valve piston bushing 306, a secondary valve piston 307, a back pressure cavity 308, and a secondary valve cover 304, the two ends of the secondary pilot valve body 303 are respectively provided with the secondary pilot valve pressure relief cavity 302 and the back pressure cavity 308, a circular through hole is formed between the secondary pilot valve pressure relief cavity 302 and the back pressure cavity 308, the valve rod 301 with the valve flap passes through the circular through hole to be fixedly connected with the secondary valve piston 307, the secondary valve piston bushing 306 is fixedly installed in the back pressure cavity 308, the secondary valve piston bushing 306 is slidably connected with the secondary valve piston 307, the two ends of the secondary pilot valve spring 305 are, the back pressure cavity 308 is communicated with the primary valve outlet cavity 215, the secondary valve cover 304 is fixedly connected with the secondary pilot valve body 303, a first groove 309 is formed in the secondary valve piston bushing 306, a first passage 310 is formed in the secondary pilot valve body 303, the first groove 309 is communicated with the first passage 310, the first passage 310 is communicated with the exhaust pipe 6, the exhaust pipe 6 is communicated with the secondary pilot pressure relief cavity 302, the secondary pilot valve body 303 is fixedly connected with the main valve cover 110, the left end of the valve rod 301 with the valve clack is arranged inside the main valve piston back pressure cavity 113, condensed water in the back pressure cavity 308 is collected into the first groove 309 to enter the first passage 310, and finally is discharged through the exhaust pipe 6, so that the action accuracy of the secondary valve piston 307 is guaranteed.

The sixth specific implementation mode: the embodiment is described with reference to fig. 1, 4 and 5, and the vacuum device 4 of the embodiment includes a vacuum rod 401, a vacuum rod slideway support 402, a slideway cavity 404, a vacuum piston 405, an o-ring 406, a disc spring 407, a vacuum cylinder valve stem 408 and an adjusting screw sleeve 409, the vacuum rod slideway support 402 is fixedly connected with a main valve bonnet 110, an output end of the vacuum rod 401 passes through the vacuum rod slideway support 402 to contact with the main valve stem 104, the vacuum rod slideway support 402 prevents the vacuum rod 401 from shifting during sliding, an input end of the vacuum rod 401 passes through the vacuum piston 405 to be fixedly connected with the vacuum cylinder valve stem 408, the vacuum piston 405 is slidably connected with the slideway cavity 404, the adjusting screw sleeve 409 is in threaded connection with the slideway cavity 404, the vacuum cylinder valve stem 408 is slidably connected with the adjusting screw sleeve, the disc spring 407 is sleeved on the vacuum cylinder valve stem 408, a left end of the disc spring 407 is abutted on the vacuum piston 405, the right end of the disc spring 407 is abutted against the adjusting screw sleeve 409, an annular groove is processed on the side wall of the vacuum piston 405, the O-shaped sealing ring 406 is sleeved in the annular groove of the vacuum piston 405, the O-shaped sealing ring 406 is a sealing ring made of common materials, the cost is saved, the temperature in the vacuum device 4 is lower than the initial temperature, the O-shaped sealing ring 406 is not influenced, the service life of the O-shaped sealing ring 406 is prolonged, the manpower, material resources and financial resources required by maintenance are reduced, the adjusting screw sleeve 409 is rotated, the adjusting screw sleeve 409 moves axially along the slide way cavity 404, the stress of the disc spring 407 is changed, the elastic force of the disc spring 407 is adjusted, the elastic force of the disc spring 407 is larger than that of the common spring, the slide way cavity 404 is divided into a left cavity and a right cavity by the vacuum piston 405, and the.

According to the above-mentioned embodiment, the present embodiment is described with reference to fig. 1, 4, and 5, and the operation principle of the horizontal bidirectional sealing pilot operated safety valve of the present embodiment is as follows:

1. in a state of no pressure load, the main valve flap 103, the primary valve flap 202 and the valve rod 301 with flap are pressed, the vacuum piston 405 receives the force of the disc spring 407, the vacuum piston 405 presses the vacuum rod 401, the vacuum rod 401 abuts against the main valve rod 104, and the main valve spring 107 transmits the force to the main valve rod 104 through the main valve piston 105, and presses the main valve flap 103 under the combined action of the two forces, so as to prevent the main valve flap 103 from opening when the pressure of the outlet cavity 102 is greater than that of the inlet cavity 101;

2. under the high pressure state, medium enters the left side of the slide way cavity 404 and the lower side of the primary valve clack 202 through the air inlet pipe 5, at the moment, the pressure of the primary valve spring mechanism 210 on the primary valve clack 202 is larger than the pressure of the medium in the air inlet pipe 5, the vacuum piston 405 is subjected to the pressure, and the pressure of the vacuum rod 401 on the main valve rod 104 is gradually reduced along with the increase of the pressure on the left side of the slide way cavity 404;

3. in the ultrahigh pressure state, the pressure of the vacuum rod 401 to the main valve stem 104 is gradually reduced, when the vacuum rod 401 is separated from the main valve stem 104, the pressure of the vacuum rod 401 to the main valve stem 104 is 0MPa, at this time, the leftward force of the main valve piston 105 is only the elastic force of the main valve spring 107, the primary valve flap 202 moves upward, the medium enters the secondary valve piston bushing 306, the secondary pilot valve relief chamber 302 communicates with the outlet chamber 102 through the exhaust pipe 6, so the medium pushes the secondary valve piston 307 to move leftward, the valve rod 301 with the flap moves leftward, the secondary pilot valve relief chamber 302 communicates with the main valve piston back pressure chamber 113, the pressure in the main valve piston back pressure chamber 113 decreases, the main valve piston 105 moves rightward, the valve flap 103 is driven by the main valve stem 104 to open for pressure relief, the horizontal bidirectional sealing relief valve vibrates during the pressure relief, the main valve 1, the main valve 104, and the main, The secondary pilot valve 3 and the vacuum device 4 are transversely arranged, so that the gravity center is reduced, the anti-seismic performance is good, the phenomena of looseness, cracks and fracture at the joint of parts are prevented, the service lives of the horizontal bidirectional sealing pilot type safety valve and other parts on the application equipment of the safety valve are influenced, the times of maintaining and repairing the equipment and replacing the parts are reduced, the manpower, material resources and financial resources are saved under the condition of not influencing the normal work, and the efficiency is improved;

4. as the pressure decreases, the primary pilot valve 2 is reset by the primary valve spring mechanism 210, the pressure in the back pressure chamber 308 decreases, the secondary pilot valve 3 is reset by the secondary pilot valve spring 305, the disc spring 407 pushes the vacuum piston 405 to press the vacuum rod 401 against the main valve stem 104, and the main valve flap 103 is closed by the vacuum rod 401 and the main valve spring 107.

It should be noted that, in the above embodiments, as long as the technical solutions can be aligned and combined without contradiction, those skilled in the art can exhaust all possibilities according to the mathematical knowledge of the alignment and combination, and therefore the present invention does not describe the technical solutions after alignment and combination one by one, but it should be understood that the technical solutions after alignment and combination have been disclosed by the present invention.

This embodiment is only illustrative of the patent and does not limit the scope of protection thereof, and those skilled in the art can make modifications to its part without departing from the spirit of the patent.

Claims (6)

1. The utility model provides a horizontal two-way seal pilot operated relief valve which characterized in that: the automatic control valve comprises a main valve (1), a primary pilot valve (2), a secondary pilot valve (3) and a vacuum device (4), wherein the main valve (1) is respectively connected with the vacuum device (4) and the primary pilot valve (2) through an air inlet pipe (5), the secondary pilot valve (3) is installed with the main valve (1), and the primary pilot valve (2) is connected with the secondary pilot valve (3).

2. The horizontal two-way seal pilot operated safety valve of claim 1, wherein: the main valve (1) comprises an inlet cavity (101), an outlet cavity (102), a main valve clack (103), a main valve stem (104), a main valve piston (105), a main valve piston bush (106), a main valve spring (107), a main valve bonnet (110), a main valve piston cavity (111), a main valve plug plate (112) and a main valve piston backpressure cavity (113), the inlet cavity (101) is fixedly connected with the main valve piston cavity (111), the main valve piston (105) separates the main valve piston cavity (111) from the main valve piston backpressure cavity (113), a mounting hole is processed on the main valve bonnet (110), the secondary pilot valve (3) is communicated with the main valve piston backpressure cavity (113) through the mounting hole, a circular hole is processed in the center of the main valve bonnet (110), a vacuum device (4) is installed with the main valve stem (104) through the circular hole in the main valve bonnet (110), the main valve piston bush (106) is installed in the main valve piston cavity (111) and the main valve piston backpressure cavity (113), the main valve piston (105) is slidably mounted in a main valve piston bush (106), two ends of a main valve spring (107) are respectively abutted against the main valve piston (105) and a main valve cover (110), a main valve plugging plate (112) is mounted on the left side of the main valve piston bush (106), the main valve plugging plate (112) is mounted with a main valve piston cavity (111), a circular through hole is machined in the centers of the main valve plugging plate (112) and the main valve piston (105), a main valve rod (104) penetrates through the circular through hole machined in the centers of the main valve plugging plate (112) and the main valve piston (105) to be in contact with a vacuum device (4), a main valve flap (103) is fixedly connected to the left end of the main valve rod (104), and the main valve flap (103) is used for opening/closing an outlet cavity (.

3. The horizontal two-way seal pilot operated safety valve according to claim 2, wherein: a groove (109) is formed in the main valve piston bushing (106), a first drainage channel (108) is formed in the joint of the inlet cavity (101) and the main valve piston cavity (111), and the first drainage channel (108) is communicated with the inlet cavity (101) and the groove (109).

4. The horizontal two-way seal pilot operated safety valve of claim 1, wherein: the primary pilot valve (2) comprises a primary valve inlet cavity (201), a primary valve clack (202), a primary valve locking sleeve (203), an adjusting nut (204), a primary valve rod (205), a first valve cover (206), an inserted rod (207), a second valve cover (208), a wrench (209), a primary valve spring mechanism (210), an auxiliary valve body (211), an auxiliary valve cap (212), an auxiliary valve rod (213), a safety rope lock (214), a primary valve outlet cavity (215), a primary valve body (216) and a stop block (217), wherein the side surface of the primary valve body (216) is detachably provided with the second valve cover (208), the first valve cover (206) is detachably arranged above the primary valve body (216), the primary valve locking sleeve (203) is fixedly arranged in the primary valve body (216), the primary valve clack (202) is slidably arranged in the primary valve locking sleeve (203), and the primary valve clack (202) is arranged on the upper portion of the primary valve inlet cavity (201), the primary valve clack (202) is installed between a primary valve inlet cavity (201) and a primary valve outlet cavity (215), a primary valve rod (205) is connected to the top of the primary valve clack (202), a primary valve body (216) is penetrated through the free end of the primary valve rod (205) and is arranged in a first valve cover (206), a radial through hole is formed in the side wall of the first valve cover (206), an insertion rod (207) penetrates through the radial through hole, the left end of the insertion rod (207) is hinged to the side wall of the first valve cover (206), a wrench (209) is arranged on the lower side of the insertion rod (207), the wrench (209) is hinged to the side wall of the first valve cover (206), the wrench (209) is hinged to the left side of the first valve cover (206), the insertion rod (207) is hinged to the right side of the first valve cover (206), a stop block (217) is fixedly connected to the top end of the primary valve rod (205), a through hole with the insertion rod (207) is machined, the diameter of which is larger than that of the primary valve rod (, the free end of a primary valve rod (205) penetrates through a through hole in an insert rod (207), a primary valve spring mechanism (210) is arranged in a primary valve body (216), an adjusting nut (204) is connected to the top of the primary valve body (216) in a threaded manner, the upper part of the primary valve spring mechanism (210) props against the bottom of the adjusting nut (204), the primary valve rod (205) slides to penetrate through the adjusting nut (204), the primary valve spring mechanism (210) and a primary valve locking sleeve (203) to be fixedly connected with a primary valve clack (202), a stepped shaft is arranged on the primary valve rod (205), the bottom of the primary valve spring mechanism (210) props against the stepped shaft of the primary valve rod (205), an auxiliary valve body (211) is fixedly arranged on the side surface of a primary valve outlet cavity (215), the auxiliary valve rod (213) is connected with the auxiliary valve body (211) in a threaded manner, the auxiliary valve rod (213) is arranged between the primary valve outlet cavity (215) and the auxiliary valve body, the auxiliary valve cap (212) and the auxiliary valve body (211) are detachably arranged, and the auxiliary valve cap (212) is connected with the wrench (209) through a safety rope lock (214).

5. The horizontal type two-way sealing pilot operated safety valve according to claim 2 or 4, wherein: the secondary pilot valve comprises a valve rod (301) with a valve clack, a secondary pilot valve pressure relief cavity (302), a secondary pilot valve body (303), a secondary pilot valve spring (305), a secondary valve piston bush (306), a secondary valve piston (307), a back pressure cavity (308) and a secondary valve cover (304), wherein the two ends of the secondary pilot valve body (303) are respectively provided with the secondary pilot valve pressure relief cavity (302) and the back pressure cavity (308), a round through hole is processed between the secondary pilot valve pressure relief cavity (302) and the back pressure cavity (308), the valve rod (301) with the valve clack passes through the round through hole to be fixedly connected with the secondary valve piston (307), the secondary valve piston bush (306) is fixedly arranged in the back pressure cavity (308), the secondary valve piston bush (306) is in sliding connection with the secondary valve piston (307), the two ends of the secondary pilot valve spring (305) are respectively fixed on the secondary pilot valve body (303) and the secondary valve piston (307), the back pressure cavity (308) is communicated with the primary valve outlet cavity (215), a first groove (309) is processed on the secondary valve piston bushing (306), a first passage (310) is processed on the secondary pilot valve body (303), the first groove (309) is communicated with the first passage (310), the first passage (310) is communicated with the exhaust pipe (6), the exhaust pipe (6) is communicated with the secondary pilot valve pressure relief cavity (302), the secondary pilot valve body (303) is fixedly connected with the main valve cover (110), and the left end of the valve rod (301) with the valve clack is arranged inside the main valve piston back pressure cavity (113).

6. The horizontal two-way seal pilot operated safety valve according to claim 2, wherein: the vacuum device (4) comprises a vacuum rod (401), a vacuum rod slideway support (402), a slideway cavity (404), a vacuum piston (405), an O-shaped sealing ring (406), a disc spring (407), a vacuum cylinder valve rod (408) and an adjusting screw sleeve (409), wherein the vacuum rod slideway support (402) is fixedly connected with a main valve cover (110), the output end of the vacuum rod (401) penetrates through the vacuum rod slideway support (402) to be universally connected with the main valve rod (104), the input end of the vacuum rod (401) penetrates through the vacuum piston (405) to be fixedly connected with the vacuum cylinder valve rod (408), the vacuum piston (405) is slidably connected with the slideway cavity (404), the adjusting screw sleeve (409) is in threaded connection with the slideway cavity (404), the vacuum cylinder valve rod (408) is slidably connected with the adjusting screw sleeve (409), the disc spring (407) is sleeved on the vacuum cylinder valve rod (408), the left end of the disc spring (407) is propped against the vacuum piston (405), the right end of the disc spring (407) is supported against the adjusting threaded sleeve (409), an annular groove is processed on the side wall of the vacuum piston (405), an O-shaped sealing ring (406) is sleeved in the annular groove of the vacuum piston (405), the slide way cavity (404) is divided into a left cavity and a right cavity by the vacuum piston (405), and the left cavity of the vacuum piston (405) is communicated with the inlet cavity (101).

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