KR100493947B1 - Gas Valve of Electronic Type - Google Patents

Abstract

The present invention provides an electronic gas valve that opens and closes and maintains a valve by generating a magnetic field according to an electric current applied from the outside. An opening / closing member (15) installed in the gas entry port and operated according to a predetermined control signal to open or close the gas passage; A closing spring (19) for closing the gas passage by elastically supporting the opening / closing shaft (17) integrated with the opening / closing member upwardly; A blocking member 20 installed in close contact with an upper end of the opening and closing shaft and sealing a gas access port from the outside; A core housing 30 fixedly seated at an upper end of the blocking member, the coil being wound around a central cylindrical core 31 to generate electromagnetic force through an operation support inserted into the lower end of the cylindrical core and the cylindrical core; An opening / closing actuator 40 inserted into the cylindrical core of the core housing and operated by an electromagnetic force formed by the coil to open the opening / closing member through the blocking member; And a manual opening and closing means (51) for manually operating the opening and closing actuator when the power failure is installed on the top of the opening / closing actuator, and automatically returning to the original position when the power failure is released. In addition, it is possible to secure the gas valve with the structure of the valve side and the control side to provide an electronic gas valve that is easy to maintain.

Description

Gas Valve of Electronic Type

The present invention relates to an electronic gas valve, and in particular, the gas valve is provided by dividing the gas valve into a valve side of the gas passage and a control side for controlling the opening and closing of the valve side, and a spring is installed at the lower end of the opening / closing member on the valve side. In addition, a rubber blocking membrane is installed at a portion where the valve side and the control side are fastened, and the control side relates to an electronic gas valve which can secure the stability of the operation by installing a shock absorbing spring to eliminate the valve opening and closing malfunction caused by external vibration. .

Conventional electronic gas valve is made as shown in Figure 1, as shown, the coil 4 to generate a magnetic field according to the rated voltage applied from the outside, and the magnetic field in accordance with the application of a voltage from the inside of the coil (4) The stator 5 into which energy is induced and the stator 5 are inserted into the connecting pin 8 inserted into the central plunger recess 7 with the spring 9 interposed therebetween according to whether the voltage is applied or not. The plunger 6 which is in close contact with and spaced apart, the gas inlet port 1 which is bound with the core housing of the vertical movement of the plunger and the gas flows in and out, and the gas inlet port 1 is opened and closed in accordance with the movement of the plunger 6. It is composed of an opening and closing member (3).

The driving principle of the electromagnetic gas valve as described above is that when a current flows first in the coil 4, a magnetic field is generated in the center of the coil 4 so that the stator 5 in the center of the coil 4 becomes an electromagnet. The plunger 6 spaced apart by (9) moves by the force of the magnetic field of the coil 4, and comes into close contact with the stator 5, which becomes an electromagnet. At this time, the opening and closing member 3 is moved by the moving force to open the valve, and in the absence of power, the closed state of the valve is maintained by the elastic force of the spring.

At this time, under the structure as described above, the coil 4 is opened when the valve is opened by the force of the spring 9 and the pressure of the gas flowing in the gas entry port 1 in the structure closed only by the elastic force of the spring 9. Increase the amount of current flowing in the

Under the structure of the spring 9 inserted into the plunger 6, there is a problem that the elastic force of the spring cannot be sufficiently closed by the pressure of the gas flowing in the gas entry port 1.

That is, when power is applied to the coil 4, in the above structure, it is opened by the upward movement of the plunger by the electromagnetic force against the unstable elastic force caused by the spring, but when the power is not applied, minute leakage occurs due to the incomplete maintenance state of the valve closing. Occurs, causing problems with the reliability of the valve.

Therefore, the elastic force of the spring 9 is increased to prevent the minute leakage, and when the valve is opened, only the electrical energy must be increased in order to obtain the electromagnetic force repulsed to the corresponding elasticity. In other words, the coil 4 due to the increase in the amount of current flowing through the coil 4 is overheated to shorten the life of the product, as well as to affect the reliability of the valve.

Therefore, the conventional electronic gas valve has the advantage of easy control and remote control compared to the mechanical valve, but the electronic gas valve under the structure does not provide enough elastic force of the spring to maintain the closed state of the valve reliability There is a problem in that even if it maintains a sufficient elastic state requires a lot of electrical energy, there was a problem that the reliability of the electronic gas valve due to the heat generated at this time is lowered.

In addition, when the spring needs to be replaced due to the reliability problem of valve closing, the entire valve must be disassembled, and thus the entire valve must be disassembled, which causes considerable inconvenience in replacing or repairing the valve accessories.

In addition, under such a valve structure, no power is supplied to the valve in the event of a power failure, and thus the valve cannot be opened at all. To be changed, there is a problem that the user has to manually change the manual mode to automatic mode.

Accordingly, an object of the present invention, by dividing the gas valve to the valve side of the gas passage and the control side for controlling the opening and closing of the valve side of the gas passage, to provide an electronic gas valve that is easy to maintain when a problem occurs in a specific site It is.

In addition, another object of the present invention, the gas valve is provided by dividing the gas valve into a valve side device of the gas passage and a control side device for controlling the opening and closing of the valve side, the spring is provided at the lower end of the opening and closing member of the valve side When the valve is closed, the sealing force of the opening and closing member can be increased, and a rubber blocking membrane can be installed at the position where the valve side and the control side are fastened to completely block the gas leakage. In order to eliminate the shock absorbing spring to provide an electronic gas valve that can ensure the stability of the operation.

In addition, another object of the present invention is to operate regardless of the situation by providing a manual opening and closing function for the user's arbitrary operation and automatic return function to automatically release when the power failure is released in the event of a power failure or valve device problems, The present invention provides an electronic gas valve that can provide convenience and reliability.

Technical means of the present invention for achieving the above object, the electronic gas valve for opening and maintaining the valve by generating a magnetic field in accordance with the current applied from the outside: a gas inlet port 10 through which gas enters; An opening / closing member (15) installed in the gas entry port and operated according to a predetermined control signal to open or close the gas passage; A closing spring (19) for closing the gas passage by elastically supporting the opening / closing shaft (17) integrated with the opening / closing member upwardly; A blocking member 20 installed in close contact with an upper end of the opening and closing shaft and sealing a gas access port from the outside; A core housing 30 fixedly seated at an upper end of the blocking member, the coil being wound around a central cylindrical core 31 to generate electromagnetic force through an operation support inserted into the lower end of the cylindrical core and the cylindrical core; An opening / closing actuator 40 inserted into the cylindrical core of the core housing and operated by an electromagnetic force formed by the coil to open the opening / closing member through the blocking member; And a manual opening and closing means (51) for manually operating the opening and closing actuator when the power failure is installed on the top of the opening and closing actuator, and automatically returning to the original position when the power failure is released.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2A and 2B are an assembled perspective view and a partial separated perspective view of the electronic gas valve according to the present invention, wherein the gas entry port 10, the blocking member 20, the core housing 30, the opening / closing actuator 40, the manual It consists of the opening-closing means 51, etc., and is divided into the valve side apparatus containing the said gas entry port 10, and the control side apparatus which opens and closes the gas entry / exit of the said gas entry port 10.

The gas entry port 10 is a pipe through which gas enters and exits and has an opening / closing member 15 for opening or closing a gas passage therein. The opening / closing member 15 is operated at an upper end of the opening / closing member 15. Opening and closing shaft 17 extends slightly protrudes to the outside through the hole 13 formed on one side top.

The blocking member 20 is installed in close contact with the upper end of the opening and closing shaft 17 protruding through the hole 13 of the gas entry port 10 and seals the gas entry port 10 from the outside while opening and closing the gas. It is configured to transmit the physical force to the opening and closing shaft 17, the core housing 30 is seated on the upper end of the blocking member 20 is fixed to the gas entry port 10 is installed in the central cylindrical core 31 The coil 33 is wound to generate electromagnetic force to open and close the gas passage. The coil 33 is inserted into the lower end of the cylindrical core 31 to support the cylindrical core 31 at the top of the blocking member 20 and to the coil 33. When the power is applied, the opening and closing actuator 40 and the operating support member 35 is mutually acting.

Then, the opening and closing actuator 40 is inserted into the cylindrical core 31 of the core housing 30 is operated up / down by the electromagnetic force formed by the coil 33 and the operating support 35 to block the blocking member 20 Is configured to open the gas passage through the opening and closing shaft 17, the manual opening and closing means 51 is installed on the top of the opening and closing actuator 40 when the power outage manually operates the opening and closing actuator 40 It is configured to automatically return to the original position when the power failure is released.

In addition, the blocking member 20, the rubber blocking film 21 of the corrugated plate shape to prevent the gas flowing into the gas entry port 10 through the hole 13 of the opening and closing shaft 17, and the It is made of a metal cap 25 is seated on the upper center portion of the rubber barrier membrane 21 and in contact with the bottom surface of the opening and closing actuator (40).

The opening and closing actuator 40 is inserted into the central hole 36 of the operation support member 35 inserted into the lower end of the cylindrical core 31 and pressed to open and close the upper surface of the metal cap 25 of the blocking member 20. An operating shaft 41 for opening the member 15, and connected to the operating shaft 41 to be inserted into the cylindrical core 31 of the core housing 30 to the electromagnetic force of the coil 33 and the operating support 35. Correspondingly, the upper and lower working bodies 43 and the projections 43 connected to the actuators 43 and protruding slightly upward on the upper end of the plate in the form of a plate protruding outward from the cylindrical core 31 are provided. It is inserted between the operation plate 45 and the operation support 43 of the actuator 43 and the cylindrical core 31 so that the operating shaft 41 contacts the metal cap 25 by external vibration when the valve is closed. It is made of a buffer spring (49) to prevent.

The manual opening and closing means 51 is an operation switch 52 for randomly moving left and right when the valve is manually opened, and is installed at the lower end of the operation switch 52 to open and close the operation switch 52. A projection 53 which is in contact with the projection 46 of the operation plate 45 of the sieve 40 to operate the opening / closing operation body 40 downward, and is provided at one side of the projection 53 to operate the operation switch 52. It is made of a return spring 54 for applying elasticity to return to the original position, but automatically returning the operation switch 52 to the original position at the same time as the downward movement of the opening and closing actuator 40 after manual operation.

3 is a cross-sectional view showing a valve closing state according to an embodiment of the present invention, Figure 4 is a cross-sectional view showing a valve opening state in an embodiment of the present invention.

As shown in the figure, the gas entry port 10 has a gas inlet IN and an outlet OUT formed therein, and the opening and closing member 15 for opening and closing the gas passage between the gas inlet and the outlet. And an opening / closing shaft 17 which is formed integrally with the opening / closing member 15 and protrudes outward through the hole 13 of the gas access port 10, and is provided at a lower end of the opening / closing member 15. Closing springs 19 for closing the opening and closing members 15 by applying an elastic force to the top are respectively installed.

The blocking member 20 is disposed on an upper end of the opening / closing shaft 17 protruding to the outside of the gas access port 10 through one side hole 13 of the gas access port 10, and the blocking member 20 A rubber barrier film 21 which prevents gas flowing into the gas entry port 10 from leaking through the hole 13 of the opening / closing shaft 17 and a rubber blocking film 21 seated on an upper end of the rubber blocking film 21 to open and close the actuator 40. It consists of a metal cap 25 in contact with the bottom surface of the operating shaft (41) of.

The upper end of the blocking member 20 is fixed to the gas entry port 10 and the core housing 30 is generated to generate an electromagnetic force to open and close the gas by winding the coil 33 to the inner cylindrical core 31 and The opening and closing actuator 40 is inserted into the cylindrical core 31 positioned at the center of the core housing 30, and the opening and closing actuator 40 is formed by the coil 33 wound on the cylindrical core 31. It is operated to the lower end by the electromagnetic force formed to open the gas passage through the opening and closing shaft 17 by the operating shaft 41 presses the metal cap 25 of the blocking member 20.

The outer housing 50 having the manual opening and closing means 51 is set around the core housing 30 and the opening and closing actuator 40, and the manual opening and closing means 51 is disposed on the upper end of the outer housing 50. This is disposed, the manual opening and closing means 51 is installed on the top of the opening and closing actuator 40 to operate the opening and closing actuator 40 manually when the power failure, the manual opening and closing means 51 when the power failure It is configured to return to the original position automatically.

Therefore, a passage through which gas can flow toward the valve seat 11 side of the opening / closing member 15 of the gas entry port 10 forming the inlet and the outlet is provided, and the opening and closing of the passage is formed on the top of the opening and closing member 15. The passage is closed or opened by the downward movement. The up / down movement of the opening and closing member 15 is interlocked according to the up and down movement of the opening and closing shaft 17 which is integrally connected.

Meanwhile, in FIG. 3, the opening / closing member 15 and the opening / closing shaft 17 are driven by the elastic force of the closing spring 19 in the gas entry port 10 in a state where power is not applied to the coil 33 of the core housing 30. ) Shows a state in which an elastic force is applied in an upward direction to close the gas passage.

Subsequently, when power is applied to the coil 33 to open the valve, an electromagnetic force that pulls the open / close actuator 40 downward acts strongly, and the open / close actuator 40 moves downward by the electromagnetic force, thereby opening and closing the open / close actuator 40. The operating shaft 41 of the actuator 40 presses the metal cap 25 of the blocking member 20 to move the opening / closing shaft 17 disposed at the lower end of the rubber blocking membrane 21 to the lower side, thereby opening and closing the member 15. Is kept open as the valve seat 11 is spaced apart.

When the power applied to the coil 33 is stopped, electromagnetic force for moving the switch actuator 40 to the lower end is not generated, and the actuator 43 of the switch actuator 40 and the cylindrical core 31 are not generated. The opening and closing actuator 40 returns to its original position due to the elastic force of the shock absorbing spring 49 inserted into the opening, and the opening and closing member 15 moves to the top due to the elastic force of the closing spring 19 to maintain the gas passage closed. .

On the other hand, during a power outage, the power applied to the coil 33 is stopped and the gas valve is automatically locked. In this case, the valve must be opened manually, and the state in which the valve is manually opened is shown in FIG. 5. 4 shows a state in which the manual switch is returned to its original position upon return.

That is, when the gas valve is locked due to a power failure, when the operation switch 52 of the manual opening / closing means 51 is pushed to one side, the protrusion 53 formed at the lower end of the operation switch 52 opens and closes. While seated on the projection 46 of the operation plate portion 45 of the 40, the opening and closing actuator 40 is pushed downward and the opening and closing member 15 is opened by moving the opening and closing actuator 40 downward.

That is, the manual opening and closing means 51 is formed on the upper end of the outer housing 50, the user switch arbitrarily moved to the left and right, the lower end of the operation switch 52, that is, of the outer housing 50 A projection 53 is formed on the bottom to interlock in accordance with the movement of the operation switch 52, and the projection 53 is an operation plate 45 of the opening and closing actuator 40 when the operation switch 52 is operated left and right. By pressing the projections 46 of the opening and closing actuator 40 is operated to the lower side, one side of the projections 53 is provided with a return spring 54 so that a repulsive force is applied to the manual operation of the operation switch 52. It has a structure.

In addition, the projections 46 of the operation plate 45 and the projections 53 of the operation switch 52 are manufactured in a pair of uneven shapes so that the projections 53 of the operation switch 52 are operated by the operation plate portion ( When pressing the projection 46 of 45), it is preferable to prevent slipping.

Due to this structure, when the operation switch 52 is pushed to the left or right side, the protrusion 53 at the bottom is also interlocked to press the protrusion 46 of the operating plate part 45 of the opening and closing actuator 40, and the operating plate part 45 is provided. In accordance with the pressing of the projection 46, the operating shaft 41 of the opening and closing actuator 40 connected integrally is lowered, and the opening and closing member 15 is pressed by pressing the opening and closing shaft 17 through the blocking member 20. The gas passage is opened apart from the surface of the seat 11.

In this manner, the gas trapped in the gas entry port 10 flows through the passage on the valve seat 11 side due to the difference in the pressure of the gas entry port 10.

Therefore, the manual opening and closing means 51 is forcibly opening the gas passage through the operation switch 52 when the power supply is not supplied in a manner for manual control of the gas valve in the case of power failure, rather than electric control.

However, as shown in FIG. 4, between the opening and closing actuator 40 and the core housing 30 due to the close contact between the opening and closing actuator 40 and the core housing 30 in the open state by the electromagnetic force of the coil 33. There is no interval of, but in the manual open state in which the operation switch 52 is operated as shown in FIG. 5, the opening and closing actuator 40 and the core housing 30 are at regular intervals, that is, the operation plate part of the opening and closing actuator 40 ( It is desirable to maintain the spacing between 45) and the top surface of the core housing 30 to an extent of 0.3 mm to 1.5 mm.

This is to secure the space of the lower end of the opening and closing actuator 40 when the power is applied to the coil 33 after the power failure is restored later, and at this time, the projection 46 and the operation switch of the opening and closing actuator 40 ( The projection 53 of the 52 is slightly spaced apart and at the same time to return the operation switch 52 to the original position by the restoring force of the return spring 54, and the projection 46 of the operation plate 45 made of the uneven shape The projection 53 of the operation switch 52 has a depth of the groove 46-1 or a height of the projection 53 between the opening and closing actuator 40 and the core housing 30 (0.3 mm to 1.5 mm). Naturally, it must be designed smaller.

That is, FIG. 4 shows that when power is supplied to the electronic gas valve when the power failure is released, the core housing 30 pulls the opening and closing actuator 40 downward to closely contact with the opening and closing actuator 40, which was generated during manual operation. The gap of the core housing 30 is lost.

Therefore, the opening and closing actuator 40 and the core housing 30 are brought into close contact with each other by the electrostatic release, so that the protrusion 46 of the operation switch 52 and the protrusion 46 of the operation plate 45 of the opening and closing actuator 40 are 0.3 mm or more. It is spaced at an interval of about 1.5mm, at this time, the structure that is bound between the projection 46 of the opening and closing actuator 40 and the projection 53 of the operation switch 52 is released and the operation switch 52 is returned. It is returned to the original position by the spring 54.

That is, the valve maintains the open state as shown in FIG. 4 due to power supply in the manual open state, and when the power is not applied or cuts off the power, the closed state by the closing spring 19 as shown in FIG. Keep it.

Therefore, even if the manual opening state is maintained, the valve can be automatically opened and closed by applying power even without a separate manual operation.

Although specific embodiments of the present invention have been described and illustrated above, it should be understood that the present invention is not limited to gas valves but can also be used as fluid valves, such as liquids. It is obvious that simple design changes or material changes are possible. Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, but should fall within the claims appended to the present invention.

As described above, in the present invention, by dividing the gas valve into the valve side of the gas passage and the control side controlling the valve opening and closing of the valve side, when a problem occurs in a specific part, partial separation is easy and maintenance is very easy. There is an easy advantage.

In addition, by installing a closing spring at the lower end of the opening and closing member for opening and closing the gas passage, it is possible to increase the passage sealing force of the opening and closing member when the valve is closed, and by installing a rubber barrier membrane at the portion where the valve side and the control side is engaged, the gas leak It can be completely blocked, the control side has the advantage to ensure the stability of the operation according to the vibration by installing a buffer spring to eliminate the valve opening and closing malfunction due to external vibration.

In addition, when a power failure or a problem occurs in the valve device, a manual open / close function for user operation and an automatic return function for automatically canceling the manual state when the power failure is released are automatically switched to the electronic mode when the power failure is released after manual operation. Regardless of the situation, there is an advantage to ensure the convenience and stability of the operation.

1 is a cross-sectional view showing the structure of an electronic gas valve according to the prior art,

Figure 2a is an assembled perspective view of the electronic gas valve according to the present invention,

Figure 2b is a partially separated perspective view showing an electronic gas valve according to the present invention,

3 is a cross-sectional view showing a valve closing state according to an embodiment of the present invention,

Figure 4 is a cross-sectional view showing a valve open state in one embodiment of the present invention,

5 is a cross-sectional view showing a manual opening state of the valve according to an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

10: Gas entry port 11: Valve seat

13: hole 15: opening and closing member

17: opening and closing shaft 19: closing spring

20: blocking member 21: rubber barrier film

25: metal cap 30: core housing

31: cylindrical core 33: coil

35: working support 36: working support hole

40: opening and closing actuator 41: operating shaft

43: actuator 45: operating plate portion

49: shock absorbing spring 50: outer housing

51: manual opening and closing means 52: operation switch

53: protrusion 54: return spring

Claims (12)

The operating rod, by the generation of magnetic field of the coil attached to the working body seungha drop which the gas is operating up / down in correspondence with the electromagnetic force of the gas access port, the coil into and out of works with working body, the load seungha drop opening In an electronic gas valve for manually opening and closing the shaft and the actuator to generate a magnetic field according to the current applied from the outside to open and close the valve. An opening / closing member (15) installed in the gas entry port and operated according to a predetermined control signal to open or close the gas passage; A closing spring (19) for closing the gas passage by elastically supporting the opening / closing shaft (17) integrated with the opening / closing member upwardly; A blocking member 20 installed in close contact with an upper end of the opening / closing shaft and sealing the gas access port from the outside; A core housing 30 fixedly seated at an upper end of the blocking member, the coil being wound around a central cylindrical core 31 to generate electromagnetic force through an operation support inserted into the lower end of the cylindrical core and the cylindrical core; An operating shaft 41 inserted into the cylindrical core of the core housing to open the opening and closing member by pressing an upper surface of the metal cap of the blocking member; An actuator 43 connected to the operation shaft and inserted into a cylindrical core of the core housing and operating up and down in response to the electromagnetic force of the coil; And an actuating actuator (40) having an operating plate portion (45) connected to the actuator and having a protrusion (46) protruding upward on an upper end thereof in a plate shape protruding outside the cylindrical core. And An operation switch 52 installed at an upper portion of the opening / closing actuator to randomly move from side to side when manually opening the valve; A protrusion 53 installed at a lower end of the operation switch to contact the protrusion 46 of the operation plate of the opening and closing actuator to operate the opening and closing actuator downward; And a return spring (54) installed on one side of the protrusion (53) to apply elasticity to return the operation switch to its original position, and to automatically return the operation switch to the original position at the same time as the lower side of the opening / closing actuator when the power is applied after the operation. Equipped with a manual operation of the opening and closing the actuator when the power outage, the manual opening and closing means for automatically returning to the original position when the power failure is released; Electronic gas valve comprising a. The method according to claim 1, The valve-side device including the opening / closing member 15, the opening / closing shaft 17, the closing spring 19, and the gas access port 10 with the blocking member 20 as the center , the core housing 30, and the opening / closing actuator ( An electronic gas valve having a structure that is divided into two parts by a valve control side device including a 40) and a manual opening and closing means (51). The method according to claim 1, The closing spring 19 is elastically applied in a direction in which the opening and closing member is closed inside the gas access port, and a gas opening current is applied to the opening and closing shaft of the opening and closing member, or the gas passage is opened by the manual opening and closing means. Electronic gas valve, characterized in that configured to maintain the opening and closing member in a gas closed state. The method according to claim 1, The blocking member 20 may include a rubber barrier layer 21 disposed at an upper end of a hole through which the opening and closing shaft of the gas entry port is exposed, and preventing gas in the gas entry port from leaking to the outside through the hole; And a metal cap (25) seated on an upper end of the rubber barrier membrane and in contact with a lower surface of an operating shaft of the opening / closing actuator. The method according to claim 1, The actuating support is mounted on the top of the blocking member and is inserted into the lower end of the cylindrical core to support the cylindrical core and configured to act as a mutual attraction with the opening and closing actuator when the power is applied to the coil. delete The method according to claim 1, Between the actuator 43 of the opening and closing actuator 40 and the operating support 35 of the cylindrical core 31, a buffer spring 49 for preventing the malfunction of the opening and closing actuator 40 due to vibration is further disposed. Electronic gas valve, characterized in that. delete The method according to claim 1, In the state of manually opening and closing the valve using the operation switch of the manual opening and closing means, when power is applied to the coil, the separation between the projection 46 of the operating plate portion and the projection 53 of the operation switch due to the lower movement of the opening and closing actuator. And a structure in which the operation switch is returned to its original position by the elastic force of the return spring (54). The method according to claim 1, The projection 53 of the operation switch and the projection 46 of the operation plate portion of the opening and closing actuator is an electronic gas valve, characterized in that configured in a pair of uneven shape. The method according to claim 1, When opening the valve by applying power to the coil of the core housing, the operation plate 45 of the opening and closing actuator is in close contact with the upper surface of the core housing 30, but the valve is opened using the manual opening and closing means 51. When opening, the electronic gas valve, characterized in that the operating plate portion 45 of the opening and closing actuator is configured to open the valve in a state slightly separated from the upper surface of the core housing (30). The method according to claim 11, When the valve is opened using the manual opening and closing means, an interval between the operating plate 45 and the upper surface of the core housing 30 of the opening and closing actuator is about 0.3 mm to 1.5 mm. .