Piston type normally-open electromagnetic gas emergency cut-off valve

Abstract

The utility model provides a piston type normally-open electromagnetic type gas emergency cut-off valve which comprises a valve body and a valve cover arranged on the valve body, a partition body which divides the interior of the valve body into a gas inlet chamber and a gas outlet chamber is arranged in the valve body, a mounting hole is formed in the partition body, a normally-open valve element is arranged on the mounting hole, and the valve cover is arranged on the valve cover. The normally-open valve element comprises a core body which is connected with the mounting hole in an inserted mode and internally provided with a core groove, a side air inlet communicated with the air inlet chamber is formed in the outer side wall of the core body, an upper shaft penetrating hole is formed in the top face of the core body, a lower shaft penetrating hole is formed in the bottom face of the core body, and a movable shaft penetrates through the upper shaft penetrating hole and the lower shaft penetrating hole. A valve rod penetrating through the valve cover is arranged at the top of the movable shaft, a valve plate connected with the movable shaft is arranged in the core groove in a sliding mode, a vent hole is formed in the valve plate, an air outlet is formed in the top face of the core body, and an electromagnetic air cylinder with a piston rod connected with the top of the valve rod is arranged above the valve cover. The piston type normally-open electromagnetic gas emergency cut-off valve can be automatically opened and closed, and the gas leakage rate can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of a gas emergency cut-off valve, in particular to a piston-type normally open electromagnetic gas emergency cut-off valve. Background Art

[0002] Gas valves are generally used on natural gas pipelines to control the on and off of natural gas pipelines. In daily life, gas alarms are generally installed on natural gas pipelines. When a gas leak occurs in the pipeline, the gas alarm can generate an alarm signal to notify people to close the gas valve or stay away from the leakage area. However, when no one is around, if the gas valve is not closed for a long time, the concentration of the leaked gas may reach the explosion limit, causing a gas explosion accident. In addition, when the user does not hear the alarm signal, the leaked gas may cause gas poisoning to the user, endangering human health.

[0003] Cut-off valves are widely used in industrial manufacturing industries such as chemical and petroleum, especially in pipelines that require the transportation of special gases such as oil and natural gas. The gas emergency cut-off valve is a safety device used in gas transmission pipelines. It is mainly installed at the outlet of the gas storage tank pipeline. It can be quickly cut off in an emergency. In the event of equipment failure, corrosion damage, seal failure, leakage, or emergency, emergency cut-off can be used to avoid accidents and other safety issues.

[0004] The Chinese patent with the existing authorization announcement number CN212509535U discloses a gas emergency shut-off valve that is opened under pressure, including a valve body member provided with a main valve port, a valve cup matching the main valve port is arranged in the valve body member, a valve body cavity is formed between the valve cup and the valve body member, an air inlet connected to the valve body cavity is arranged on the valve cup, a lower connecting nut is connected to the valve cup, an upper connecting nut is connected to the lower connecting nut, a connecting port is arranged on the upper connecting nut, a valve stem is slidably connected to the valve body member and the upper connecting nut, a pilot part is connected to the valve stem, the pilot part is connected to the upper connecting nut and the lower connecting nut, the pilot part is used to guide out the gas in the valve body cavity, the pilot part includes a pilot disk connected to the valve stem, a pilot valve port matching the pilot disk and opened on the lower connecting nut, the valve body member includes a valve body front end and a valve body rear end, the valve body rear end is located on a side of the main valve port away from the valve cup, the valve body rear end is located on a side of the main valve port close to the valve cup, and the valve body front end is connected to the air inlet.

[0005] When the pressurized gas emergency shut-off valve is working, the worker pulls the valve stem upwards to open the pilot valve port. At this time, the gas pressure in the valve body cavity is greater than the gas pressure at the rear end of the valve body, thereby causing the gas in the valve body cavity to enter the rear end of the valve body. Since the diameters of the pilot valve port and the connecting port are greater than the diameter of the air inlet, that is, the speed at which the gas at the front end of the valve body flows into the valve body cavity is less than the speed at which the gas in the valve body cavity flows into the rear end of the valve body, the valve cup is lifted and the main valve port is opened.

[0006] The above-mentioned prior art solutions have the following defects: the gas emergency shut-off valve that opens under pressure needs to be opened and closed manually by workers. When a gas pipeline leaks, it is difficult for workers to close the gas emergency shut-off valve that opens under pressure in time, which can easily lead to an increase in gas leakage and endanger the health of users or workers. Utility Model Content

[0007] The problem to be solved by the utility model is to provide a piston-type normally open electromagnetic gas emergency shut-off valve in view of the above-mentioned deficiencies existing in the prior art, which solves the problem of increased gas leakage existing in the prior art.

[0008] The above-mentioned utility model object of the utility model is achieved through the following technical scheme: a piston-type normally open electromagnetic gas emergency shut-off valve, comprising a valve body and a valve cover arranged on the valve body, wherein a partition is arranged in the valve body to divide the interior of the valve body into an air inlet chamber and an air outlet chamber, a mounting hole is provided on the partition, a normally open valve core is provided on the mounting hole, the normally open valve core comprises a core body which is plugged into the mounting hole and has a core groove inside, a side air inlet connected to the air inlet chamber is provided on the outer side wall of the core body, an upper through-axis hole is provided on the top surface of the core body, a lower through-axis hole is provided on the bottom surface of the core body, a movable shaft is provided on the upper through-axis hole and the lower through-axis hole, a valve stem penetrating the valve cover is provided on the top of the movable shaft, a valve plate connected to the movable shaft is slidably arranged in the core groove, a vent is provided on the valve plate, an air outlet is provided on the top surface of the core body, and an electromagnetic cylinder with a piston rod connected to the top of the valve stem is provided above the valve cover.

[0009] The utility model is further configured as follows: a top plate spring is sleeved on the movable shaft, one end of the top plate spring abuts against the bottom wall of the core groove, and the other end abuts against the bottom surface of the valve plate.

[0010] The utility model is further configured as follows: a lower air inlet communicating with the air inlet chamber is provided on the bottom surface of the core body, and a plug plugged with the lower air inlet is provided on the end surface of the valve plate facing the lower air inlet.

[0011] The utility model is further configured as follows: a connecting block is arranged on the top of the movable shaft, and a threaded hole threadedly connected to the bottom of the valve stem is opened on the top surface of the connecting block.

[0012] The utility model is further configured as follows: a core fixing flange is extended outward from the top of the outer side wall of the core body, the bottom surface of the core fixing flange is against the top surface of the flat part of the separator, and the core fixing flange is screwed to the top surface of the separator.

[0013] The utility model is further configured as follows: a lower sealing groove is opened on the top surface of the valve body, a convex ring engaged with the lower sealing groove is arranged on the bottom surface of the valve cover, and a lower sealing ring engaged with the lower sealing groove is arranged on the bottom surface of the convex ring.

[0014] The utility model is further configured as follows: a plurality of lower bolt holes are provided on the top surface of the valve body, a plurality of upper bolt holes aligned with the lower bolt holes are provided on the bottom surface of the valve cover, fixing screws are passed through the upper and lower bolt holes, and the fixing screws are threadedly connected with fixing nuts after passing through the lower and upper bolt holes in sequence.

[0015] The utility model is further configured as follows: a cylinder frame is arranged between the valve cover and the electromagnetic cylinder, the cylinder frame includes a lower plate arranged on the top surface of the valve cover, a vertical rod arranged on the top surface of the lower plate, and an upper plate arranged on the top of the vertical rod; the electromagnetic cylinder is arranged on the top surface of the upper plate, the piston rod of the electromagnetic cylinder passes through the upper plate, and the valve stem passes through the lower plate.

[0016] The utility model is further configured as follows: an upper rod hole, an opening, an upper sealing groove, and a lower rod hole are sequentially opened on the top surface of the valve cover downward; a plurality of upper sealing rings sleeved on the valve stem are embedded in the upper sealing groove; a pressing ring platform for pressing and fixing the upper sealing ring in the upper sealing groove is arranged in the opening; a middle rod hole is opened in the middle of the pressing ring platform; the valve stem passes through the lower plate, the upper rod hole, the middle rod hole, the upper sealing groove, and the lower rod hole in sequence.

[0017] The utility model is further configured as follows: a fixing frame is arranged on the outer side wall of the valve cover, the fixing frame includes two fixing plates fixedly connected to the outer side wall of the valve cover, each of the fixing plates is provided with an outer locking rod hole, a locking screw is passed through the through hole, an inner locking rod hole aligned with the outer locking rod hole is formed at the bottom of the locking screw, a locking rod pin is passed through the outer locking rod hole and the inner locking rod hole, a locking nut is threadedly connected to the top of the locking screw after passing through the through hole, a locking washer is sleeved on the locking screw, and the locking washer is located between the locking nut and the top surface of the pressure ring platform.

[0018] To sum up, the beneficial technical effects of the utility model are as follows: the piston-type normally open electromagnetic gas emergency shut-off valve is in a normally open state. When the gas pipeline system needs maintenance or repair or gas leakage and overflow occurs, the valve can be closed in time, and the piston-type normally open electromagnetic gas emergency shut-off valve can be automatically opened and closed, which is beneficial to reduce gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a piston-type normally open electromagnetic gas emergency shut-off valve in the utility model;

[0020] Figure 2It is a partial structural schematic diagram of a piston-type normally open electromagnetic gas emergency shut-off valve in the utility model;

[0021] Figure 3 It is a structural schematic diagram of the valve cover in the utility model;

[0022] Figure 4 It is a cross-sectional structural diagram of the valve core and the valve stem in the utility model.

[0023] In the above drawings: 1, valve body; 2, separator; 3, air inlet chamber; 4, air outlet chamber; 5, mounting hole; 6, normally open valve core; 7, core body; 8, fixed core flange; 9, core groove; 10, lower air inlet; 11, side air inlet; 12, air outlet; 13, upper shaft hole; 14, lower shaft hole; 15, movable shaft; 16, connecting block; 17, threaded hole; 18, valve plate; 19, plug; 20, vent hole; 21, top plate spring; 22, lower bolt hole; 23, valve cover; 24, upper bolt hole; 25, fixing screw; 26, fixing nut; 27, lower seal Sealing groove; 28, convex ring; 29, lower sealing ring; 30, upper rod hole; 31, opening; 32, upper sealing groove; 321, upper sealing ring; 33, lower rod hole; 34, pressure ring platform; 35, through hole; 36, middle rod hole; 37, fixing frame; 371, fixing plate; 38, outer locking rod hole; 39, locking screw; 40, inner locking rod hole; 41, locking rod pin; 42, locking nut; 43, locking gasket; 44, cylinder frame; 441, lower plate; 442, vertical rod; 443, upper plate; 45, electromagnetic cylinder; 451, piston rod; 46, valve stem. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and functions achieved by the present invention clearer and easier to understand, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0025] like Figure 1 As shown, the utility model provides a piston-type normally open electromagnetic gas emergency shut-off valve, comprising a valve body 1 and a valve cover 23 arranged on the valve body 1 .

[0026] like Figure 2 As shown, a separator 2 is fixedly connected to the valve body 1, and the separator 2 divides the internal chamber of the valve body 1 into an air inlet chamber 3 and an air outlet chamber 4. A mounting hole 5 is provided on the top surface of the separator 2, and the cross section of the mounting hole 5 is circular. The lower end of the mounting hole 5 is connected to the air inlet chamber 3, and the upper end of the mounting hole 5 is connected to the air outlet chamber 4.

[0027] like Figure 2 and 4As shown, a normally open valve core 6 is inserted in the mounting hole 5, and the normally open valve core 6 includes a cylindrical core body 7. The core body 7 passes through the mounting hole 5, and the core body 7 is plugged into the mounting hole 5. A fixed core flange 8 extends outward from the top of the outer wall of the core body 7. The cross-section of the fixed core flange 8 is a circular ring. The bottom surface of the fixed core flange 8 is against the top surface of the flat part of the partition 2, and the fixed core flange 8 is screwed to the top surface of the partition 2.

[0028] like Figure 2 and 4 As shown, the core body 7 has a core groove 9 inside, and the cross section of the core groove 9 is circular. A plurality of lower air inlets 10 are equidistantly arranged on the bottom surface of the core body 7, and the lower air inlet 10 is a circular hole, and the lower air inlet 10 is connected to the air inlet chamber 3. A plurality of side air inlets 11 are equidistantly arranged on the outer wall of the core body 7, and the side air inlet 11 is a circular hole, and the side air inlet 11 is connected to the air inlet chamber 3. A plurality of air outlets 12 are equidistantly arranged on the top surface of the core body 7, and the air outlet 12 is a circular hole, and the air outlet 12 is connected to the air outlet chamber 4.

[0029] like Figure 2 and 4 As shown, an upper through-axis hole 13 is provided at the center of the top surface of the core body 7, and a lower through-axis hole 14 is provided at the center of the bottom surface of the core body 7. Both the upper through-axis hole 13 and the lower through-axis hole 14 are circular holes. A movable shaft 15 is movably provided at the center of the core groove 9. The lower end of the movable shaft 15 passes through the core groove 9 through the lower through-axis hole 14, and the upper end of the movable shaft 15 passes through the core groove 9 through the upper through-axis hole 13. The movable shaft 15 is slidably matched with the upper through-axis hole 13 and the lower through-axis hole 14. A connecting block 16 is fixedly connected to the top of the movable shaft 15. The connecting block 16 is cylindrical, and a threaded hole 17 is provided on the top surface of the connecting block 16.

[0030] like Figure 2 and 4 As shown, a disc-shaped valve plate 18 is slidably arranged in the core groove 9, and the valve plate 18 is coaxially connected to the movable shaft 15. The valve plate 18 is used to close the side air inlet 11. A plurality of plugs 19 are fixedly connected to the end surface of the valve plate 18 facing the lower air inlet 10, and the plugs 19 are plugged into and matched with the lower air inlet 10. A plurality of vent holes 20 are provided through the bottom surface of the valve plate 18, and the vent holes 20 are circular holes, and the plurality of vent holes 20 are equidistantly distributed in a circle, and the vent holes 20 are located on the inner side of the plug 19. A top plate spring 21 is sleeved on the movable shaft 15, and one end of the top plate spring 21 abuts against the bottom wall of the core groove 9, and the other end abuts against the bottom surface of the valve plate 18.

[0031] like Figure 2As shown, a plurality of lower bolt holes 22 are equidistantly provided on the top surface of the valve body 1, a plurality of upper bolt holes 24 are equidistantly provided on the bottom surface of the valve cover 23 and aligned with the lower bolt holes 22, and fixing screws 25 are passed through the upper and lower bolt holes 24, 22, and the fixing screws 25 pass through the lower and upper bolt holes 22, 24 in sequence and are threadedly connected with fixing nuts 26.

[0032] like Figure 2 As shown, a lower sealing groove 27 is provided on the top surface of the valve body 1, and the cross section of the lower sealing groove 27 is annular. A circular convex ring 28 is fixedly connected to the bottom surface of the valve cover 23, and the convex ring 28 is engaged with the lower sealing groove 27. A lower sealing ring 29 is glued to the bottom surface of the convex ring 28, and the lower sealing ring 29 is engaged with the lower sealing groove 27.

[0033] like Figure 2 As shown, the top surface of the valve cover 23 is provided with an upper rod hole 30, an opening 31, an upper sealing groove 32, and a lower rod hole 33 in sequence from top to bottom. The upper rod hole 30 is a circular hole. Both ends of the opening 31 extend to the side walls of the valve cover 23. The cross-section of the upper sealing groove 32 is circular. In this embodiment, eight upper sealing rings 321 stacked in sequence are embedded in the upper sealing groove 32, and the lower rod hole 33 is a circular hole.

[0034] like Figure 2 and 3 As shown, a ring pressing platform 34 is provided in the opening 31, and the ring pressing platform 34 is used to press and fix the upper sealing ring 321 in the upper sealing groove 32. Two through holes 35 are symmetrically provided on the top surface of the ring pressing platform 34, and a middle rod hole 36 is provided through the middle of the ring pressing platform 34. The middle rod hole 36 is a circular hole, and the middle rod hole 36 is aligned with the upper rod hole 30 and the lower rod hole 33.

[0035] like Figure 2 and 3 As shown, two fixing frames 37 are symmetrically arranged on the outer wall of the valve cover 23, and the fixing frames 37 include two fixing plates 371 fixedly connected to the outer wall of the valve cover 23, and each fixing plate 371 is penetrated with an outer locking rod hole 38, and the outer locking rod hole 38 is a circular hole. A locking screw 39 is penetrated through the through hole 35, and the bottom of the locking screw 39 is located between the two fixing plates 371. The locking screw 39 is penetrated with an inner locking rod hole 40 aligned with the outer locking rod hole 38, and the inner locking rod hole 40 is a circular hole.

[0036] like Figure 2 and 3 As shown, a locking rod pin 41 is provided on the outer locking rod hole 38 and the inner locking rod hole 40, and the locking rod pin 41 is interference fit with the outer locking rod hole 38 and the inner locking rod hole 40. When the locking rod pin 41 passes through the outer locking rod hole 38 and the inner locking rod hole 40 at the same time, the lower end of the locking platform screw 39 is restricted from separating from the locking rod pin 41.

[0037] like Figure 2 and 3 As shown, the top of the locking screw 39 passes through the through hole 35 and is threadedly connected to a locking nut 42 . A locking washer 43 is sleeved on the locking screw 39 , and the locking washer 43 is located between the locking nut 42 and the top surface of the pressure ring platform 34 .

[0038] like Figure 1 As shown, a cylinder frame 44 is arranged on the top surface of the valve cover 23, and the cylinder frame 44 includes a lower plate 441, a vertical rod 442, and an upper plate 443. The lower plate 441 is screwed to the top surface of the valve cover 23, and the vertical rod 442 is fixedly connected between the lower plate 441 and the upper plate 443. There are four vertical rods 442, and the four vertical rods 442 are distributed in a rectangular shape. The upper plate 443 is fixedly installed on the top of the four vertical rods 442.

[0039] like Figure 1 and 2 As shown, an electromagnetic cylinder 45 is fixedly installed on the top surface of the upper plate 443. The electromagnetic cylinder 45 is a driving component. The electromagnetic cylinder 45 has a piston rod 451, which is mainly used to drive the piston rod 451 to reciprocate up and down. The piston rod 451 of the electromagnetic cylinder 45 penetrates the upper plate 443 and is flange-connected with a valve stem 46. The valve stem 46 passes through the lower plate 441, the upper rod hole 30, the middle rod hole 36, the upper sealing groove 32, and the lower rod hole 33 in sequence and then extends into the air outlet chamber 4. The bottom of the valve stem 46 is threadedly connected to the threaded hole 17 of the connecting block 16, and the upper sealing ring 321 is sleeved on the valve stem 46.

[0040] When the piston-type normally open electromagnetic gas emergency shut-off valve is working, the gas in the air inlet chamber 3 enters the core groove 9 through the lower air inlet 10 and the side air inlet 11, the gas in the lower part of the core groove 9 reaches the upper part of the core groove 9 through the vent 20, and the gas in the upper part of the core groove 9 enters the air outlet chamber 4 through the air outlet 12.

[0041] When the piston-type normally open electromagnetic gas emergency shut-off valve is working, the combustible gas leakage detection instrument in the gas pipeline system detects gas leakage, and the gas alarm generates an alarm signal. The control system transmits the signal of closing the piston-type normally open electromagnetic gas emergency shut-off valve to the electromagnetic cylinder 45, and the electromagnetic cylinder 45 drives the piston rod 451 downward. The downward movement of the piston rod 451 will push the valve stem 46 downward. Since the movable shaft 15 is connected to the bottom thread of the valve stem 46 through the threaded hole 17 of the connecting block 16, the movable shaft 15 will move downward accordingly. The downward movement of the movable shaft 15 will drive the valve plate 18 coaxially connected thereto to move downward. The downward movement of the valve plate 18 will close the side air inlet 11. At the same time, the plug 19 will close the lower air inlet 10. At this time, the piston-type normally open electromagnetic gas emergency shut-off valve is in a closed state, restricting the passage of gas.

[0042] The piston-type normally open electromagnetic gas emergency shut-off valve is in a normally open state. When the gas pipeline system needs maintenance or repair or gas leakage or overflow occurs, the valve can be closed in time. In addition, the piston-type normally open electromagnetic gas emergency shut-off valve can be opened and closed automatically, which is beneficial to reducing gas leakage.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A piston-type normally open electromagnetic gas emergency shut-off valve, comprising a valve body (1) and a valve cover (23) disposed on the valve body (1), characterized in that: The valve body (1) is provided with a partition (2) for partitioning the interior of the valve body (1) into an air inlet chamber (3) and an air outlet chamber (4); the partition (2) is provided with a mounting hole (5); the mounting hole (5) is provided with a normally open valve core (6); the normally open valve core (6) comprises a core body (7) which is plugged into the mounting hole (5) and has a core groove (9) inside; the outer side wall of the core body (7) is provided with a side air inlet (11) which is connected to the air inlet chamber (3); the top surface of the core body (7) is provided with an upper through-axis hole (13); the bottom surface of the core body (7) is provided with a A lower shaft hole (14) is provided, and a movable shaft (15) is provided on the upper shaft hole (13) and the lower shaft hole (14). A valve stem (46) penetrating the valve cover (23) is provided on the top of the movable shaft (15). A valve plate (18) connected to the movable shaft (15) is slidably provided in the core groove (9), and a vent hole (20) is provided on the valve plate (18). An air outlet (12) is provided on the top surface of the core body (7), and an electromagnetic cylinder (45) connected to the top of the valve stem (46) by a piston rod (451) is provided above the valve cover (23).

2. A piston-type normally open electromagnetic gas emergency shut-off valve according to claim 1, characterized in that: A top plate spring (21) is sleeved on the movable shaft (15), one end of the top plate spring (21) abuts against the bottom wall of the core groove (9), and the other end abuts against the bottom surface of the valve plate (18).

3. A piston-type normally open electromagnetic gas emergency shut-off valve according to claim 1, characterized in that: A lower air inlet (10) communicating with the air inlet chamber (3) is provided on the bottom surface of the core body (7), and a plug (19) plugged into the lower air inlet (10) is provided on the end surface of the valve plate (18) facing the lower air inlet (10).

4. A piston-type normally open electromagnetic gas emergency shut-off valve according to claim 1, characterized in that: A connecting block (16) is arranged on the top of the movable shaft (15), and a threaded hole (17) threadedly connected to the bottom of the valve stem (46) is provided on the top surface of the connecting block (16).

5. The piston-type normally open electromagnetic gas emergency shut-off valve according to claim 1, characterized in that: A core fixing flange (8) extends outward from the top of the outer wall of the core body (7), the bottom surface of the core fixing flange (8) abuts against the top surface of the flat portion of the separator (2), and the core fixing flange (8) is screwed to the top surface of the separator (2).

6. A piston-type normally open electromagnetic gas emergency shut-off valve according to claim 1, characterized in that: A lower sealing groove (27) is provided on the top surface of the valve body (1), a convex ring (28) is provided on the bottom surface of the valve cover (23) and is engaged with the lower sealing groove (27), and a lower sealing ring (29) is provided on the bottom surface of the convex ring (28) and is engaged with the lower sealing groove (27).

7. The piston-type normally open electromagnetic gas emergency shut-off valve according to claim 1, characterized in that: The top surface of the valve body (1) is provided with a plurality of lower bolt holes (22), and the bottom surface of the valve cover (23) is provided with a plurality of upper bolt holes (24) aligned with the lower bolt holes (22). Fixing screws (25) are inserted through the upper bolt holes (24) and the lower bolt holes (22). The fixing screws (25) pass through the lower bolt holes (22) and the upper bolt holes (24) in sequence and are then threadedly connected with fixing nuts (26).

8. The piston-type normally open electromagnetic gas emergency shut-off valve according to claim 1, characterized in that: A cylinder frame (44) is arranged between the valve cover (23) and the electromagnetic cylinder (45), and the cylinder frame (44) includes a lower plate (441) arranged on the top surface of the valve cover (23), a vertical rod (442) arranged on the top surface of the lower plate (441), and an upper plate (443) arranged on the top of the vertical rod (442). The electromagnetic cylinder (45) is arranged on the top surface of the upper plate (443), the piston rod (451) of the electromagnetic cylinder (45) passes through the upper plate (443), and the valve stem (46) passes through the lower plate (441).

9. A piston-type normally open electromagnetic gas emergency shut-off valve according to claim 8, characterized in that: An upper rod hole (30), an opening (31), an upper sealing groove (32), and a lower rod hole (33) are sequentially provided on the top surface of the valve cover (23) downwardly; a plurality of upper sealing rings (321) sleeved on the valve stem (46) are embedded in the upper sealing groove (32); a pressing ring platform (34) for pressing and fixing the upper sealing ring (321) in the upper sealing groove (32) is provided in the opening (31); two through holes (35) are symmetrically provided on the top surface of the pressing ring platform (34); a middle rod hole (36) is provided in the middle of the pressing ring platform (34); the valve stem (46) sequentially passes through the lower plate (441), the upper rod hole (30), the middle rod hole (36), the upper sealing groove (32), and the lower rod hole (33).

10. A piston-type normally open electromagnetic gas emergency shut-off valve according to claim 9, characterized in that: A fixing frame (37) is arranged on the outer wall of the valve cover (23), and the fixing frame (37) includes two fixing plates (371) fixedly connected to the outer wall of the valve cover (23), each of the fixing plates (371) is provided with an outer locking rod hole (38), a locking screw (39) is passed through the through hole (35), an inner locking rod hole (40) aligned with the outer locking rod hole (38) is arranged at the bottom of the locking screw (39), a locking rod pin (41) is passed through the outer locking rod hole (38) and the inner locking rod hole (40), the top of the locking screw (39) passes through the through hole (35) and is threadedly connected to a locking nut (42), a locking washer (43) is sleeved on the locking screw (39), and the locking washer (43) is located between the locking nut (42) and the top surface of the pressure ring platform (34).

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