CN112212059A - Backflow prevention electromagnetic valve with pipeline pressure detection function - Google Patents
Backflow prevention electromagnetic valve with pipeline pressure detection function Download PDFInfo
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- CN112212059A CN112212059A CN202011119375.1A CN202011119375A CN112212059A CN 112212059 A CN112212059 A CN 112212059A CN 202011119375 A CN202011119375 A CN 202011119375A CN 112212059 A CN112212059 A CN 112212059A
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- valve body
- fixedly connected
- wall
- backflow prevention
- pressure detection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
- F16K31/0655—Lift valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/06—Check valves with guided rigid valve members with guided stems
- F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/18—Check valves with actuating mechanism; Combined check valves and actuated valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Driven Valves (AREA)
Abstract
The invention provides a backflow prevention electromagnetic valve with pipeline pressure detection, which relates to the technical field of electromagnetic valves and comprises a valve body, wherein two ends of the valve body are respectively and fixedly connected with a flange, the top end of the valve body is fixedly connected with a control device, a fixing plate is fixedly arranged on the inner wall of the valve body, and a first through hole is formed in the fixing plate. The invention has the beneficial effects that: under the effect of the opening and closing mechanism, when the valve body is used, water enters through the water inlet end of the valve body, the pressure sensor can sense the pressure of the water, the signal is delivered to the controller, the controller processes the signal and delivers the processed signal to the electromagnet, the electromagnet is powered by the storage battery to be started, the magnetic first sliding block is attracted, the movable plate connected with the first sliding block moves to the water outlet of the valve body, the first sliding block is compressed by the spring, and the water circulates through the expanded first penetrating opening and the expanded second penetrating opening.
Description
Technical Field
The invention relates to the technical field of electromagnetic valves, in particular to a backflow prevention electromagnetic valve with pipeline pressure detection.
Background
The electromagnetic valve is an industrial device controlled by electromagnetism, is an automatic basic element for controlling fluid, belongs to an actuator, is not limited to hydraulic pressure and pneumatics, and is used for adjusting the direction, flow rate, speed and other parameters of a medium in an industrial control system.
The existing electromagnetic valve does not have a mechanism capable of smoothly discharging water by sensing the pressure of the water, and does not have a mechanism capable of conveniently replacing a long-term stressed spring, and does not have a mechanism capable of automatically powering off after the water stops flowing, and can play a backflow prevention effect.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a backflow prevention solenoid valve with pipeline pressure detection, which solves the technical problems that the existing solenoid valve does not have a mechanism which can realize smooth discharge of a water body by sensing the pressure of the water body, does not have a mechanism which can conveniently replace a spring stressed for a long time, and does not have a mechanism which can automatically power off when the water body stops flowing and can play a backflow prevention effect.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
a backflow prevention solenoid valve with line pressure detection, comprising: the valve comprises a valve body, wherein two ends of the valve body are respectively and fixedly connected with a flange, the top end of the valve body is fixedly connected with a control device, the inner wall of the valve body is fixedly provided with a fixed plate, and a first through hole is formed in the fixed plate;
one end of the fixing plate is annularly provided with a connecting column, and one end of the fixing plate is fixedly connected with a pressure sensor;
the inner wall of the valve body is connected with an opening and closing mechanism, and the inner cavities formed in the two sides of the inner wall of the valve body are respectively connected with an ejecting mechanism.
Furthermore, a water inlet is formed in one end of the valve body, a water outlet is formed in the other end of the valve body, and fixing holes convenient for screws to insert are formed in the two flanges respectively.
Further, controlling means's outer wall connection has display screen and control button, and controlling means's internally mounted has controller and battery, and the input of controller is connected with pressure sensor, control button and battery, and the output of controller is connected with the display screen.
Furthermore, the outside of spliced pole is connected with the sealing washer, and the sealing washer rotates sealing connection with the spliced pole.
Further, the mechanism that opens and shuts is including seting up the spout one in the inner wall both sides of valve body, and the equal sliding connection in inside of two spout ones has slider one, two fixedly connected with fly leaf between the slider one, and the inside ring of fly leaf is equipped with and runs through mouthful two, the one end fixedly connected with piston of fly leaf, two the equal fixedly connected with electro-magnet in spout one inner wall one side, and equal swing joint has the inserted bar in the jack that two electro-magnets and two slider ones were seted up, and the outside of two inserted bars is fixedly connected with connecting block respectively, two the outside of connecting block all is connected with the invisible groove of seting up the outer wall at the flange of valve body right-hand member, two the outside of inserted bar all overlaps and is equipped with and is located the inside spring one.
Furthermore, the diameter of the cross section of the piston is equal to the diameter of the first through hole, and the diameter of the second through hole is equal to the diameter of the cross section of the connecting column.
Furthermore, the input ends of the two electromagnets are electrically connected with the output end of the controller respectively, and the two connecting blocks are fixedly connected with the invisible grooves through screws respectively.
Further, the pop-up mechanism comprises two sliding grooves which are arranged on two sides of the inner wall of the inner cavity of the two sides of the inner wall of the valve body, two sliding blocks are connected inside the two sliding grooves in a sliding mode, two sliding blocks are fixedly connected between the two sliding blocks, and two springs are fixedly connected between the left end face of each sliding block and the left side of the inner wall of the inner cavity.
Furthermore, the cross sectional area of the movable block is larger than that of the second spring, and the movable block is elastically connected with the inner cavity through the second spring.
(III) advantageous effects
The invention provides a backflow prevention electromagnetic valve with pipeline pressure detection. Compared with the prior art, the method has the following beneficial effects:
1. this solenoid valve prevents flowing backwards, under the effect of mechanism opens and shuts, when the valve body is using, its water passes through the water inlet end entering of valve body, its pressure sensor can feel the pressure of water, then it hands over its signal to the controller, its controller is through behind its signal processing, and hand over to the electro-magnet, then its electro-magnet starts through the battery power supply, then attract its slider that has magnetism one, then the fly leaf that its slider one is connected removes to the delivery port department of valve body, thereby a pair of spring one of its slider compresses, then its water circulates through the penetration one that expandes and the penetration two that expandes, pressure sensor shows its pressure data through the display screen simultaneously, the user of being convenient for carries out real-time supervision.
2. This solenoid valve prevents flowing backwards, the water stops to get into from the water inlet end of valve body, then the pressure of its pressure sensor can not experience water, then submit its signal to the controller, the controller handles the back and submits the signal for the electro-magnet, its electro-magnet outage, withdraw the attraction to having magnetic slider one, thereby make the fly leaf under the reverse action of spring one, can carry out the playback, the piston that its fly leaf one end is connected can pair its fixed plate inside through-hole one, simultaneously a plurality of through-hole two that its fly leaf inside was seted up can pair its fixed plate outside fixed connection's a plurality of spliced poles, thereby carry out the quick stop to its water, prevent the effect of refluence.
3. This solenoid valve prevents flowing backwards, under pop-up mechanism's effect, spring one is under long-term use, can make its elastic tension lose original effect, then need change its spring one, then the user can loosen the screw between its connecting block and the stealthy groove and unload, then its movable block loses the support of its inserted bar and presses, under the reverse action of spring two, make the inserted bar shift out from an inside promotion of spout by the movable block, the user of being convenient for at this moment pulls out its inserted bar from a inside of spout through the pulling connecting block, then its spring one deviates from a inside of spout, convenience of customers changes spring one. On the contrary, when the spring is replaced, a new spring I needs to be plugged into the sliding groove I, then the inserting rod connected with the connecting block is inserted into the inner cavities of the sliding groove I and the movable block, and meanwhile, the connecting block and the invisible groove are locked by the screw.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of an overall section of a backflow prevention solenoid valve with pipeline pressure detection according to the present invention;
FIG. 2 is a right side view of the fixing plate showing the expanded structure of the present invention;
FIG. 3 is a schematic view of the left side view of the movable plate of the present invention;
FIG. 4 is an enlarged schematic view of the structure at the position A of the present invention;
FIG. 5 is an enlarged view of the structure of the present invention at B.
In the figure: 1. a valve body; 2. a flange; 3. a control device; 4. a fixing plate; 5. a first through hole; 6. connecting columns; 7. a pressure sensor; 8. an opening and closing mechanism; 801. a first sliding chute; 802. a first sliding block; 803. a movable plate; 804. a second through hole; 805. a piston; 806. an electromagnet; 807. inserting a rod; 808. connecting blocks; 809. a hidden slot; 810. a first spring; 9. an ejection mechanism; 901. a second chute; 902. a second sliding block; 903. a movable block; 904. and a second spring.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides the backflow prevention solenoid valve with the pipeline pressure detection function, and solves the technical problems that the existing solenoid valve does not have a mechanism which can realize smooth discharge of a water body by sensing the pressure of the water body, does not have a mechanism which can conveniently replace a spring stressed for a long time, and does not have a mechanism which can automatically power off the solenoid valve and play a backflow prevention effect after the water body stops flowing.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example 1: referring to fig. 1 to 5, a backflow prevention solenoid valve with a line pressure detection includes: the valve comprises a valve body 1, a flange 2, a control device 3, a fixing plate 4, a first through hole 5, a connecting column 6, a pressure sensor 7, an opening and closing mechanism 8, a first sliding groove 801, a first sliding block 802, a movable plate 803, a second through hole 804, a piston 805, an electromagnet 806, an inserted bar 807, a connecting block 808, an invisible groove 809, a first spring 810, an ejecting mechanism 9, a second sliding groove 901, a second sliding block 902, a movable block 903 and a second spring 904, wherein the flange 2 is fixedly connected to two ends of the valve body 1 respectively, the control device 3 is fixedly connected to the top end of the valve body 1, the fixing plate 4 is fixedly mounted on the inner wall of the valve body 1, the cross section of the fixing plate 4 is of a circular structure;
one end of the fixed plate 4 is annularly provided with connecting columns 6, the connecting columns 6 are annularly arranged at one end of the fixed plate 4 in an array manner, the number of the connecting columns is eight, and one end of the fixed plate 4 is fixedly connected with a pressure sensor 7;
the inner wall of the valve body 1 is connected with an opening and closing mechanism 8, and inner cavities formed in two sides of the inner wall of the valve body 1 are respectively connected with an ejecting mechanism 9.
Further, the water inlet has been seted up to the one end of valve body 1, and the delivery port has been seted up to the other end of valve body 1, and the screw of being convenient for is seted up respectively in the inside of two flanges 2 and is carried out male fixed orifices, and a plurality of fixed orificess that set up on the flange 2 at valve body 1 both ends are convenient for dock the installation between the pipeline with it.
Further, controlling means 3's outer wall connection has display screen and control button, controlling means 3's internally mounted has controller and battery, and the input of controller is connected with pressure sensor 7, control button and battery, and the output of controller is connected with the display screen, and pressure sensor 7 is through the pressure of response water to submit the signal to the controller, come out its information through display screen information display after its controller handles.
Further, the external connection of spliced pole 6 has the sealing washer, and the sealing washer rotates sealing connection with spliced pole 6, and the sealing washer can make spliced pole 6 play good sealed effect to penetrating a mouthful two 804 when inserting, prevents that the water refluence.
Further, the opening and closing mechanism 8 comprises first sliding grooves 801 arranged on two sides of the inner wall of the valve body 1, the insides of the first sliding grooves 801 are connected with first sliding blocks 802 in a sliding manner, a movable plate 803 is fixedly connected between the first sliding blocks 802, a second through hole 804 is annularly arranged inside the movable plate 803, the annular array of the second through holes 804 is arranged inside the movable plate 803, the number of the annular array of the second through holes is matched with the number of the connecting columns 6, the eight annular through holes are also eight, one end of the movable plate 803 is fixedly connected with a piston 805, one side of the inner wall of the first sliding grooves 801 is fixedly connected with an electromagnet 806, the two electromagnets 806 and the jacks arranged inside the first sliding blocks 802 are movably connected with inserting rods 807, the outsides of the two inserting rods 807 are fixedly connected with connecting blocks 808 respectively, the outsides of the two connecting blocks 808 are connected with invisible grooves 809 arranged on the outer wall of the flange 2 arranged at the right end of the valve body 1, an insertion hole located inside the inner wall of the valve body 1 is formed in the right side close to the first sliding groove 801, the insertion hole enables the insertion rod 807 to be inserted into the first sliding groove 801 conveniently, the diameter of the first sliding groove 801 is larger than the diameter of the cross section of the first spring 810, therefore, after the insertion rod 807 is pulled out, the first spring 810 can be separated from the first sliding groove 801 quickly conveniently, the first sliding block 802 can be set to be a magnetic component, and the first sliding block can be attracted by the electromagnet 806 after being electrified.
Furthermore, the diameter of the cross section of the piston 805 is equal to the diameter of the first through hole 5, the diameter of the second through hole 804 is equal to the diameter of the cross section of the connecting column 6, and when the piston 805 closes the first through hole 5, the connecting column 6 also closes the second through hole 804, so that the water body is prevented from flowing.
Furthermore, the input ends of the two electromagnets 806 are electrically connected with the output end of the controller, the two connecting blocks 808 are fixedly connected with the invisible grooves 809 through screws, the electromagnets 806 are arranged on the inner walls of the right sides of the two sliding grooves 801, and the electromagnets 806 can be electromagnets 806 with waterproof performance in the prior art.
Further, the pop-up mechanism 9 is including seting up two 901 chutes on the inner wall both sides of the inner chamber of valve body 1's inner wall both sides, and two chutes 901 are inside to be all sliding connected with two 902 sliders, fixedly connected with movable block 903 between two 902 sliders, and fixedly connected with spring two 904 between the left end face of movable block 903 and the inner wall left side of inner chamber, the inner chamber communicates through the jack with it spout 801, the setup of its jack is convenient for the inserted bar 807 and can insert inside the inner chamber, support its movable block 903 and press.
Furthermore, the cross-sectional area of the movable block 903 is larger than that of the second spring 904, the movable block 903 is elastically connected with the inner cavity through the second spring 904, when the insertion rod 807 is inserted into the first sliding groove 801 through the insertion hole, the insertion hole is inserted into the inner cavity, the screw is locked between the connecting block 808 connected to the insertion rod 807 and the invisible groove 809 thereof, so that the movable block 903 is pressed by the insertion rod 807 for a long time, the second spring 904 is deformed by compression, a screw hole convenient for the screw to be inserted is formed in the connecting block 808, and a threaded hole convenient for the screw to be screwed tightly is formed in the inner wall of the invisible groove 809.
According to the working principle of the embodiment of the invention, a user can butt joint the water inlet pipe and the water outlet pipe at two ends through the arrangement of the flanges 2 at two ends of the valve body 1, a plurality of fixing holes are formed in the flanges 2 at two ends, screws are inserted into the fixing holes of the flanges 2 on the water inlet pipe and the water outlet pipe at two ends, and the screws are locked by the locking bolts to realize the butt joint, fixed installation and installation of the valve body, when the valve body 1 is in use, water enters the valve body 1 through the water inlet pipe, the pressure sensor 7 (model: zg-bsq) can sense the pressure of the water, then the signal is submitted to the controller, the controller processes the signal and then submits the signal to the electromagnet 806, then the electromagnet 806 is powered by the storage battery to be started, then the magnetic slider-802 is attracted, and then the movable plate 803 connected with the slider-802 moves to the water outlet of the valve body 1, therefore, the first sliding block 802 compresses the first spring 810, water body flows through the first expanded through hole 5 and the second expanded through hole 804, meanwhile, the pressure sensor 7 displays pressure data through the display screen, so that a user can conveniently monitor in real time, otherwise, when the water body stops entering from the water inlet end of the valve body 1, the pressure sensor 7 cannot sense the pressure of the water, signals of the water body are submitted to the controller, the signals are submitted to the electromagnet 806 after being processed by the controller, the electromagnet 806 is powered off, attraction to the first magnetic sliding block 802 is removed, so that the movable plate 803 can return under the reverse action of the first spring 810, the piston 805 connected with one end of the movable plate 803 can be used for closing the first through hole 5 inside the fixed plate 4, and meanwhile, the second through holes 804 arranged inside the movable plate 803 can be used for closing the connecting columns 6 fixedly connected with the outer part of the fixed plate 4, thereby the water body can be quickly stopped and prevented from flowing backwards, and the working principle of the device is completed.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides a prevent solenoid valve that flows backwards with pipeline pressure detects which characterized in that includes: the valve comprises a valve body (1), wherein two ends of the valve body (1) are respectively and fixedly connected with a flange (2), the top end of the valve body (1) is fixedly connected with a control device (3), a fixing plate (4) is fixedly arranged on the inner wall of the valve body (1), and a first through hole (5) is formed in the fixing plate (4);
one end of the fixed plate (4) is annularly provided with a connecting column (6), and one end of the fixed plate (4) is fixedly connected with a pressure sensor (7);
the inner wall of the valve body (1) is connected with an opening and closing mechanism (8), and inner cavities formed in two sides of the inner wall of the valve body (1) are respectively connected with an ejecting mechanism (9).
2. The backflow prevention electromagnetic valve with the pipeline pressure detection function as claimed in claim 1, wherein a water inlet is formed at one end of the valve body (1), a water outlet is formed at the other end of the valve body (1), and fixing holes for screws to be conveniently inserted are respectively formed in the two flanges (2).
3. The backflow prevention electromagnetic valve with the pipeline pressure detection function as claimed in claim 1, wherein a display screen and a control button are connected to the outer wall of the control device (3), a controller and a storage battery are installed inside the control device (3), the input end of the controller is connected with the pressure sensor (7), the control button and the storage battery, and the output end of the controller is connected with the display screen.
4. The backflow prevention solenoid valve with the pipeline pressure detection function as claimed in claim 1, wherein a sealing ring is connected to the outside of the connecting column (6), and the sealing ring is connected with the connecting column (6) in a rotating and sealing mode.
5. The backflow prevention electromagnetic valve with the pipeline pressure detection function as claimed in claim 1, wherein the opening and closing mechanism (8) comprises first sliding grooves (801) formed in two sides of the inner wall of the valve body (1), first sliding blocks (802) are connected to the insides of the first sliding grooves (801) in a sliding mode, a movable plate (803) is fixedly connected between the first sliding blocks (802), a second through hole (804) is formed in the inner portion of the movable plate (803), a piston (805) is fixedly connected to one end of the movable plate (803), electromagnets (806) are fixedly connected to one side of the inner wall of the first sliding grooves (801), inserting rods (808) are movably connected to the insides of the two electromagnets (806) and the first sliding blocks (802), connecting blocks (808) are fixedly connected to the outsides of the two inserting rods (808), and invisible outer portions of the two connecting blocks (808) are connected to invisible outer walls of flanges (2) formed in the right end of the valve body (1) in a sliding mode And the outer parts of the two insertion rods (808) are respectively sleeved with a first spring (810) positioned inside the first sliding groove (801).
6. The backflow prevention solenoid valve with the pipeline pressure detection function as claimed in claim 5, wherein the diameter of the cross section of the piston (805) is equal to the caliber of the first through hole (5), and the caliber of the second through hole (804) is equal to the diameter of the cross section of the connecting column (6).
7. The backflow prevention solenoid valve with the pipeline pressure detection function as claimed in claim 5, wherein the input ends of the two electromagnets (806) are electrically connected with the output end of the controller respectively, and the two connecting blocks (808) are fixedly connected with the hidden grooves (809) respectively through screws.
8. The backflow prevention electromagnetic valve with the pipeline pressure detection function is characterized in that the ejection mechanism (9) comprises two sliding grooves (901) which are formed in two sides of the inner wall of the inner cavity on two sides of the inner wall of the valve body (1), two sliding blocks (902) are connected inside the two sliding grooves (901) in a sliding mode, a movable block (903) is fixedly connected between the two sliding blocks (902), and a second spring (904) is fixedly connected between the left end face of the movable block (903) and the left side of the inner wall of the inner cavity.
9. The backflow prevention solenoid valve with the pipeline pressure detection function as claimed in claim 7, wherein the cross-sectional area of the movable block (903) is larger than that of the second spring (904), and the movable block (903) is elastically connected with the inner cavity through the second spring (904).
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