Low-temperature-rise piston type normally-closed electromagnetic gas emergency cut-off valve

Abstract

The utility model provides a low temperature rise piston type normally closed electromagnetic type gas emergency cut-off valve which comprises a valve body and a valve cover arranged on the valve body, a lower inlet cavity and an upper vertical cavity are upwards formed in the bottom face of the valve body in sequence, a side outlet cavity communicated with the upper vertical cavity is formed in the side wall of the valve body, a normally closed valve element is inserted into the lower inlet cavity, and the normally closed valve element is inserted into the upper vertical cavity. The normally-closed valve element comprises a shell internally provided with a middle ventilation chamber, a lower inlet hole is formed in the bottom face of the shell, an upper outlet hole is formed in the top face of the shell, a valve closing ball capable of abutting against the hole wall of the upper outlet hole is movably arranged in the middle ventilation chamber, and a driving assembly with the output end connected with the valve closing ball is arranged above the valve deck. The low-temperature-rise piston type normally-closed electromagnetic gas emergency cut-off valve can be used in a gas pipeline with a right-angle bend.

Description

Technical Field

[0001] The utility model relates to the technical field of gas emergency cut-off valves, in particular to a low-temperature rise piston type normally closed 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 CN205806585U discloses a normally closed electromagnetic gas emergency shut-off valve, including a valve body and a sealing assembly for controlling the opening and closing of the valve body, a valve stem connected to the sealing assembly and a sealing block for controlling the on and off of the valve body are arranged in the valve body, a reset spring is sleeved on the valve stem, the lower end of the reset spring is fixed on the valve body, the upper end of the reset spring is fixed on the valve stem, the sealing block is fixed on the valve stem, and the sealing block is located at the on and off control port of the valve body, a movable iron core is fixed on the end of the valve stem away from the sealing assembly, a sleeve is sleeved on the outer side of the movable iron core, an electromagnetic coil is sleeved on the sleeve, a fixed iron core cooperating with the electromagnetic coil is installed in the sleeve, and the fixed iron core is located at the upper end of the movable iron core, and the gas solenoid valve also includes a controller, a drive circuit, and a holding circuit.

[0005] When in use, the controller controls the drive circuit to start the electromagnetic coil, the valve body opens, and then the controller controls the holding circuit to start and maintain a stable voltage to drive the electromagnetic coil. When the alarm occurs, the controller receives the alarm signal from the gas alarm, controls the electromagnetic coil to disconnect the power supply, and the electromagnetic force on the fixed iron core disappears. Through the elastic force of the reset spring, the sealing assembly closes the valve body.

[0006] The above-mentioned prior art solutions have the following defects: the normally closed electromagnetic gas emergency shut-off valve can only be used in straight gas pipelines and is difficult to be used in gas pipelines with right-angle bends. There is a lack of a gas emergency shut-off valve that can be used in gas pipelines with right-angle bends. Utility Model Content

[0007] The problem to be solved by the utility model is to provide a low-temperature rise piston type normally closed electromagnetic gas emergency shut-off valve in view of the above-mentioned deficiencies existing in the prior art, which solves the problem in the prior art of lacking a gas emergency shut-off valve that can be used for a gas pipeline with a right-angle bend.

[0008] The above-mentioned utility model object of the utility model is achieved through the following technical scheme: a low-temperature rise piston type normally closed electromagnetic gas emergency shut-off valve, including a valve body and a valve cover arranged on the valve body, the bottom surface of the valve body is upwardly provided with a lower inlet cavity and an upper vertical cavity in sequence, the side wall of the valve body is provided with a side outlet cavity connected to the upper vertical cavity, a normally closed valve core is inserted in the lower inlet cavity, the normally closed valve core includes an outer shell with a middle ventilation chamber inside, a lower inlet hole is provided on the bottom surface of the outer shell, an upper outlet hole is provided on the top surface of the outer shell, a valve closing ball which can be abutted against the hole wall of the upper outlet hole is movably arranged in the middle ventilation chamber, and a driving component whose output end is connected to the valve closing ball is arranged above the valve cover.

[0009] The utility model is further configured as follows: a spring protection column is arranged on the bottom wall of the middle ventilation chamber, a spring protection groove is arranged on the top surface of the spring protection column, a guide hole is arranged on the bottom wall of the spring protection groove, a guide rod is coaxially arranged on the bottom of the valve closing ball and passes through the spring protection groove and the guide hole in sequence, and the guide rod is slidably matched with the guide hole.

[0010] The utility model is further configured as follows: a guide plate slidably matched with the spring protection groove is coaxially arranged in the middle of the guide rod, a valve closing spring is sleeved on the guide rod, one end of the valve closing spring abuts against the bottom surface of the guide plate, and the other end abuts against the bottom wall of the spring protection groove.

[0011] The utility model is further configured as follows: a lower sealing ring is sleeved on the side wall of the guide plate.

[0012] The utility model is further configured as follows: a fixing plate is arranged on the top of the outer side wall of the shell, the bottom surface of the fixing plate abuts against the bottom wall of the upper vertical cavity, and the fixing plate is screwed to the bottom wall of the upper vertical cavity.

[0013] The utility model is further configured as follows: a connecting rod threaded hole is opened on the top of the valve closing ball, and the driving assembly includes an electromagnetic cylinder arranged above the valve cover and having a piston rod, and a connecting rod arranged below the piston rod. The connecting rod penetrates the valve cover and is threadedly connected to the connecting rod threaded hole of the valve closing ball.

[0014] The utility model is further configured as follows: a boss is provided on the top surface of the valve cover, a plurality of lower grooves are provided on the side wall of the boss, an upper sealing groove and a lower rod hole penetrated by a connecting rod are sequentially provided downward on the top surface of the boss, a plurality of upper sealing rings mounted on the connecting rod are embedded in the upper sealing groove, a pressure ring plate is provided on the top surface of the boss, an upper rod hole penetrated by a connecting rod is provided on the top surface of the pressure ring plate, a plurality of upper through holes aligned with the lower groove are provided on the top surface of the pressure ring plate, a locking plate screw is penetrated through the lower groove and the upper through hole, and the locking plate screw passes through the lower groove and the upper through hole sequentially from bottom to top and is threadedly connected with a locking plate nut.

[0015] The utility model is further configured as follows: a plurality of support columns are arranged on the top surface of the valve cover, a cylinder frame is arranged on the top of the support columns, the cylinder frame includes a bottom plate arranged on the top surface of the support columns, a vertical rod arranged on the top surface of the bottom plate, and a top plate arranged on the top of the vertical rod; the electromagnetic cylinder is arranged on the top surface of the top plate, the piston rod of the electromagnetic cylinder passes through the top plate, and the connecting rod passes through the bottom plate.

[0016] The utility model is further configured as follows: a plurality of lower through holes are opened on the top surface of the valve body, a plurality of upper through holes aligned with the lower through holes are opened on the bottom surface of the valve cover, locking screws are passed through the upper and lower through holes, the locking screws pass through the lower and upper through holes in sequence and are threadedly connected with a locking nut, 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 valve cover.

[0017] The utility model is further configured as follows: a middle sealing groove is opened on the top surface of the valve body, a sealing ring embedded in the middle sealing groove is arranged on the bottom surface of the valve cover, and a middle sealing ring embedded in the middle sealing groove is arranged on the bottom surface of the sealing ring.

[0018] To sum up, the beneficial technical effects of the utility model are as follows: the low-temperature-rise piston type normally closed electromagnetic gas emergency shut-off valve is in a normally closed state. When the gas needs to be loaded or unloaded, the low-temperature-rise piston type normally closed electromagnetic gas emergency shut-off valve can be automatically opened. After the loading or unloading work is completed, the low-temperature-rise piston type normally closed electromagnetic gas emergency shut-off valve can be automatically closed. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0022] Figure 4 It is a structural schematic diagram of the valve cover in the utility model.

[0023] In the above drawings: 1, valve body; 2, valve cover; 3, lower inlet chamber; 4, upper vertical chamber; 5, side outlet chamber; 6, normally closed valve core; 7, shell; 8, fixed shell plate; 9, middle ventilation chamber; 10, lower inlet hole; 11, upper outlet hole; 12, spring column; 13, spring groove; 14, guide hole; 15, valve closing ball; 16, connecting rod threaded hole; 17, guide rod; 18, guide plate; 19, lower sealing ring; 20, valve closing spring; 21, lower through hole; 22, upper through hole; 23, locking screw; 24, locking screw Nut; 25, locking washer; 26, middle sealing groove; 27, sealing ring; 28, middle sealing ring; 29, boss; 30, upper sealing groove; 31, lower through-rod hole; 32, upper sealing ring; 33, lower groove; 34, pressure ring plate; 35, upper through-rod hole; 36, upper through-hole; 37, locking plate screw; 38, locking plate nut; 39, support column; 40, cylinder frame; 401, bottom plate; 402, vertical rod; 403, top plate; 41, electromagnetic cylinder; 411, piston rod; 42, connecting rod. 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 proposes a low-temperature rise piston type normally closed electromagnetic gas emergency shut-off valve, comprising a valve body 1 and a valve cover 2 arranged on the valve body 1. The valve body 1 and the valve cover 2 are both made of copper, so the valve body 1 and the valve cover 2 have excellent heat dissipation performance. The low-temperature rise piston type normally closed electromagnetic gas emergency shut-off valve has the characteristic of low temperature rise.

[0026] like Figure 1 and 2 As shown, a lower inlet chamber 3 and an upper vertical chamber 4 are sequentially opened on the bottom surface of the valve body 1, a side outlet chamber 5 is horizontally opened on the side wall of the valve body 1, the side outlet chamber 5 is connected with the upper vertical chamber 4, and a normally closed valve core 6 is inserted in the lower inlet chamber 3, and the normally closed valve core 6 is used to control the connection and disconnection between the lower inlet chamber 3 and the upper vertical chamber 4.

[0027] like Figure 2 and 3 As shown, the normally closed valve core 6 includes a shell 7 inserted in the lower inlet chamber 3, and the top of the outer wall of the shell 7 is fixedly connected to a fixed shell plate 8, the cross-section of the fixed shell plate 8 is a circular ring, the bottom surface of the fixed shell plate 8 is against the bottom wall of the upper vertical chamber 4, and the fixed shell plate 8 is screwed to the bottom wall of the upper vertical chamber 4.

[0028] like Figure 2 and 3 As shown, the interior of the outer shell 7 has a middle ventilation chamber 9, and a plurality of lower inlet holes 10 are equidistantly arranged on the bottom surface of the outer shell 7, and the lower inlet holes 10 are used to connect the lower inlet cavity 3 and the middle ventilation chamber 9. An upper outlet hole 11 is arranged at the center of the top surface of the outer shell 7, and the upper outlet hole 11 is used to connect the middle ventilation chamber 9 and the upper vertical cavity 4.

[0029] like Figure 2 and 3 As shown, a cylindrical spring column 12 is fixedly connected to the center of the bottom wall of the middle ventilation chamber 9, and a spring groove 13 is provided on the top surface of the spring column 12. The cross section of the spring groove 13 is circular, and a guide hole 14 is penetrated through the bottom wall of the spring groove 13. The guide hole 14 is a circular hole, and the aperture of the guide hole 14 is smaller than the diameter of the spring groove 13.

[0030] like Figure 2 and 3 As shown, a valve closing ball 15 is movably arranged in the middle ventilation chamber 9. The valve closing ball 15 is spherical, and the spherical surface of the valve closing ball 15 can fit with the hole wall of the upper outlet hole 11, that is, the valve closing ball 15 can close the upper outlet hole 11, and a connecting rod threaded hole 16 is opened on the top of the valve closing ball 15.

[0031] like Figure 2 and 3 As shown, a cylindrical guide rod 17 is coaxially connected to the bottom of the valve closing ball 15. The guide rod 17 passes downward through the spring groove 13 and the guide hole 14 in sequence. The guide rod 17 and the guide hole 14 are slidably matched, so that the valve closing ball 15 and the guide rod 17 can perform reciprocating linear motion up and down relatively stably.

[0032] like Figure 2 and 3 As shown, a circular plate-shaped guide plate 18 is coaxially arranged in the middle of the guide rod 17, and the guide plate 18 is slidably matched with the spring retaining groove 13. A lower sealing ring 19 is sleeved on the side wall of the guide plate 18 by means of a groove, which is beneficial to improve the sealing between the guide plate 18 and the spring retaining groove 13.

[0033] like Figure 2 and 3 As shown, a valve closing spring 20 is sleeved on the guide rod 17, and the valve closing spring 20 is located in the spring protection groove 13. One end of the valve closing spring 20 abuts against the bottom surface of the guide plate 18, and the other end abuts against the bottom wall of the spring protection groove 13. The valve closing spring 20 is used to push the guide plate 18 upward, thereby driving the guide rod 17 and the valve closing ball 15 upward until the valve closing ball 15 abuts against the hole wall of the upper outlet hole 11. At this time, the normally closed valve core 6 is in a closed state, restricting the passage of gas.

[0034] like Figure 1 and 2As shown, a plurality of lower through holes 21 are provided on the top surface of the valve body 1 at equal intervals, and a plurality of upper through holes 22 aligned with the lower through holes 21 are provided on the bottom surface of the valve cover 2 at equal intervals. Locking screws 23 are passed through the upper through holes 22 and the lower through holes 21. The locking screws 23 pass through the lower through holes 21 and the upper through holes 22 in sequence and are threadedly connected with locking nuts 24. A locking washer 25 is sleeved on the locking screw 23 and the locking washer 25 is located between the locking nut 24 and the top surface of the valve cover 2.

[0035] like Figure 1 and 2 As shown, a middle sealing groove 26 is provided on the top surface of the valve body 1, and the cross section of the middle sealing groove 26 is annular. A ring-shaped sealing ring 27 is fixedly connected to the bottom surface of the valve cover 2, and the sealing ring 27 is engaged with the middle sealing groove 26. A middle sealing ring 28 is glued to the bottom surface of the sealing ring 27, and the middle sealing ring 28 is engaged with the middle sealing groove 26.

[0036] like Figure 2 and 4 As shown, the top surface of the valve cover 2 is fixedly connected with a boss 29, which is composed of two layers of discs with a larger upper part and a smaller lower part. An upper sealing groove 30 and a lower rod hole 31 are sequentially opened downward from the center of the top surface of the boss 29, and the bottom of the upper sealing groove 30 extends into the valve cover 2. In this embodiment, six upper sealing rings 32 stacked in sequence are embedded in the upper sealing groove 30, and the lower rod hole 31 is a circular hole. Four lower grooves 33 are opened on the side wall of the boss 29, and the four lower grooves 33 are equidistantly distributed around the circumference.

[0037] like Figure 2 and 4 As shown, a circular plate-shaped pressing ring plate 34 is provided on the top surface of the boss 29. The pressing ring plate 34 is used to press and fix the upper sealing ring 32 in the upper sealing groove 30. An upper rod hole 35 is provided at the center of the top surface of the pressing ring plate 34. The upper rod hole 35 is a circular hole. The upper rod hole 35 is aligned with the upper sealing groove 30 and the lower rod hole 31. Four upper through holes 36 are provided on the top surface of the pressing ring plate 34 at equal intervals. The four upper through holes 36 are aligned with the four lower grooves 33 respectively. A locking plate screw 37 is provided in the lower groove 33 and the upper through hole 36. The locking plate screw passes through the lower groove 33 and the upper through hole 36 from bottom to top in sequence and is then threadedly connected with a locking plate nut 38.

[0038] like Figure 1 As shown, two cylindrical support columns 39 are symmetrically arranged on the top surface of the valve cover 2, and a cylinder frame 40 is arranged on the top of the two support columns 39. The cylinder frame 40 includes a bottom plate 401, a vertical rod 402, and a top plate 403. The bottom plate 401 is screwed to the top surfaces of the two support columns 39, and the vertical rod 402 is fixedly connected between the bottom plate 401 and the top plate 403. There are four vertical rods 402, and the four vertical rods 402 are distributed in a rectangular shape. The top plate 403 is fixedly installed on the top of the four vertical rods 402.

[0039] like Figure 1 and 2 As shown, a driving assembly is arranged above the valve cover 2, and the output end of the driving assembly is connected to the valve closing ball 15. The driving assembly includes an electromagnetic cylinder 41 and a connecting rod 42. The electromagnetic cylinder 41 is a driving component. The electromagnetic cylinder 41 is fixedly installed on the top surface of the top plate 403. The electromagnetic cylinder 41 has a piston rod 411. The piston rod 411 of the electromagnetic cylinder 41 passes through the top plate 403 and is flange-connected with the connecting rod 42. The connecting rod 42 passes through the bottom plate 401, the upper rod hole 35, the upper sealing groove 30, and the lower rod hole 31 in sequence and then extends into the upper vertical cavity 4. The bottom of the connecting rod 42 is threadedly connected to the connecting rod threaded hole 16 of the valve closing ball 15, and the upper sealing ring 32 is sleeved on the connecting rod 42.

[0040] When the low-temperature-rise piston-type normally closed electromagnetic gas emergency shut-off valve is working, the elastic force generated by the valve closing spring 20 acts on the lower guide plate 18, so that the valve closing ball 15 remains in a state of abutting against the hole wall of the upper outlet hole 11. At this time, the low-temperature-rise piston-type normally closed electromagnetic gas emergency shut-off valve is in a normally closed state, restricting the passage of gas.

[0041] When the gas needs to be loaded or unloaded, the electromagnetic cylinder 41 pushes the connecting rod 42 downward through the piston rod 411. The downward movement of the connecting rod 42 will push the valve closing ball 15 and the guide rod 17 downward, and the valve closing ball 15 is separated from the hole wall of the upper outlet hole 11. At this time, the low-temperature rise piston type normally closed electromagnetic gas emergency shut-off valve is in an open state, and the gas can stably pass through the lower inlet chamber 3, the lower inlet hole 10, the middle air chamber 9, the upper outlet hole 11, the upper vertical chamber 4, and the side outlet chamber 5 in sequence.

[0042] The low-temperature-rise piston type normally closed electromagnetic gas emergency shut-off valve is in a normally closed state. When gas needs to be loaded or unloaded, the low-temperature-rise piston type normally closed electromagnetic gas emergency shut-off valve can automatically open. After the loading or unloading work is completed, the low-temperature-rise piston type normally closed electromagnetic gas emergency shut-off valve can automatically close.

[0043] The low-temperature rise piston type normally closed electromagnetic gas emergency shut-off valve can be used in gas pipelines with right-angle bends.

[0044] 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 low-temperature rise piston type normally closed electromagnetic gas emergency shut-off valve, comprising a valve body (1) and a valve cover (2) disposed on the valve body (1), characterized in that: The bottom surface of the valve body (1) is provided with a lower inlet chamber (3) and an upper vertical chamber (4) in sequence, and the side wall of the valve body (1) is provided with a side outlet chamber (5) connected to the upper vertical chamber (4). A normally closed valve core (6) is inserted in the lower inlet chamber (3). The normally closed valve core (6) includes an outer shell (7) having a middle ventilation chamber (9) therein. A lower inlet hole (10) is provided on the bottom surface of the outer shell (7), and an upper outlet hole (11) is provided on the top surface of the outer shell (7). A valve closing ball (15) capable of abutting against the hole wall of the upper outlet hole (11) is movably provided in the middle ventilation chamber (9), and a driving component having an output end connected to the valve closing ball (15) is provided above the valve cover (2).

2. A low temperature rise piston type normally closed electromagnetic gas emergency shut-off valve according to claim 1, characterized in that: A spring protection column (12) is arranged on the bottom wall of the middle ventilation chamber (9), a spring protection groove (13) is arranged on the top surface of the spring protection column (12), a guide hole (14) is arranged on the bottom wall of the spring protection groove (13), and a guide rod (17) is coaxially arranged at the bottom of the valve closing ball (15) and passes through the spring protection groove (13) and the guide hole (14) in sequence, and the guide rod (17) is slidably matched with the guide hole (14).

3. A low temperature rise piston type normally closed electromagnetic gas emergency shut-off valve according to claim 2, characterized in that: A guide plate (18) is coaxially arranged in the middle of the guide rod (17) and is slidably matched with the spring protection groove (13). A valve closing spring (20) is sleeved on the guide rod (17). One end of the valve closing spring (20) abuts against the bottom surface of the guide plate (18), and the other end abuts against the bottom wall of the spring protection groove (13).

4. A low temperature rise piston type normally closed electromagnetic gas emergency shut-off valve according to claim 3, characterized in that: A lower sealing ring (19) is sleeved on the side wall of the guide plate (18).

5. A low temperature rise piston type normally closed electromagnetic gas emergency shut-off valve according to claim 1, characterized in that: A fixing plate (8) is provided at the top of the outer wall of the outer shell (7), the bottom surface of the fixing plate (8) abuts against the bottom wall of the upper vertical cavity (4), and the fixing plate (8) is screwed to the bottom wall of the upper vertical cavity (4).

6. A low temperature rise piston type normally closed electromagnetic gas emergency shut-off valve according to claim 1, characterized in that: A connecting rod threaded hole (16) is provided on the top of the valve closing ball (15), and the driving assembly comprises an electromagnetic cylinder (41) provided above the valve cover (2) and having a piston rod (411), and a connecting rod (42) provided below the piston rod (411); the connecting rod (42) penetrates the valve cover (2) and is threadedly connected to the connecting rod threaded hole (16) of the valve closing ball (15).

7. A low temperature rise piston type normally closed electromagnetic gas emergency shut-off valve according to claim 6, characterized in that: A boss (29) is provided on the top surface of the valve cover (2), a plurality of lower grooves (33) are provided on the side wall of the boss (29), an upper sealing groove (30) and a lower rod hole (31) are provided on the top surface of the boss (29) in sequence downwardly through which a connecting rod (42) passes, the upper sealing groove (30) is provided with a plurality of upper sealing rings (32) fitted on the connecting rod (42), and a pressure ring plate (33) is provided on the top surface of the boss (29). 34), an upper rod hole (35) penetrated by a connecting rod (42) is provided on the top surface of the pressure ring plate (34), a plurality of upper through holes (36) aligned with the lower groove (33) are provided on the top surface of the pressure ring plate (34), a locking plate screw (37) is passed through the lower groove (33) and the upper through hole (36), and the locking plate screw passes through the lower groove (33) and the upper through hole (36) from bottom to top in sequence and is threadedly connected with a locking plate nut (38).

8. A low temperature rise piston type normally closed electromagnetic gas emergency shut-off valve according to claim 7, characterized in that: A plurality of support columns (39) are arranged on the top surface of the valve cover (2); a cylinder frame (40) is arranged on the top of the support columns (39); the cylinder frame (40) comprises a bottom plate (401) arranged on the top surface of the support columns (39), a vertical rod (402) arranged on the top surface of the bottom plate (401), and a top plate (403) arranged on the top of the vertical rod (402); the electromagnetic cylinder (41) is arranged on the top surface of the top plate (403); a piston rod (411) of the electromagnetic cylinder (41) passes through the top plate (403); and the connecting rod (42) passes through the bottom plate (401).

9. A low temperature rise piston type normally closed 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 through holes (21), and the bottom surface of the valve cover (2) is provided with a plurality of upper through holes (22) aligned with the lower through holes (21). Locking screws (23) are inserted through the upper through holes (22) and the lower through holes (21). The locking screws (23) pass through the lower through holes (21) and the upper through holes (22) in sequence and are then threadedly connected with a locking nut (24). A locking washer (25) is sleeved on the locking screw (23), and the locking washer (25) is located between the locking nut (24) and the top surface of the valve cover (2).

10. A low temperature rise piston type normally closed electromagnetic gas emergency shut-off valve according to claim 1, characterized in that: A middle sealing groove (26) is provided on the top surface of the valve body (1), a sealing ring (27) embedded in the middle sealing groove (26) is provided on the bottom surface of the valve cover (2), and a middle sealing ring (28) embedded in the middle sealing groove (26) is provided on the bottom surface of the sealing ring (27).

Images