KR101631050B1 - Pre-action valve using U-shaped disk packing - Google Patents

Pre-action valve using U-shaped disk packing Download PDF

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Publication number
KR101631050B1
KR101631050B1 KR1020160013188A KR20160013188A KR101631050B1 KR 101631050 B1 KR101631050 B1 KR 101631050B1 KR 1020160013188 A KR1020160013188 A KR 1020160013188A KR 20160013188 A KR20160013188 A KR 20160013188A KR 101631050 B1 KR101631050 B1 KR 101631050B1
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KR
South Korea
Prior art keywords
disc
disk
packing
bent portion
seat ring
Prior art date
Application number
KR1020160013188A
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Korean (ko)
Inventor
조시연
Original Assignee
조시연
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Priority to KR1020160013188A priority Critical patent/KR101631050B1/en
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Publication of KR101631050B1 publication Critical patent/KR101631050B1/en

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    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C35/00—Permanently-installed equipment
    • A62C35/58—Pipe-line systems
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C35/00—Permanently-installed equipment
    • A62C35/58—Pipe-line systems
    • A62C35/68—Details, e.g. of pipes or valve systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Lift Valve (AREA)

Abstract

The present invention relates to a pre-actuated valve with U-shaped disk packing.
The valve body of the present invention includes a body 10 having a communicating hole 12 formed therein and a seat ring 14 provided on the communicating hole 12 of the body 10, A disk 20 hinged on one side of the body 10 and a free end on the other side to selectively open and close the communication hole 12 in contact with the seat ring 14, A disc packing 30 disposed in contact with the outer surface of the disc 20 and contacting the seat ring 14 in a hermetic manner to contact the outer surface of the disc 20, And a disk washer 40. The disk packing 30 has a bent portion 32 extending around the edge of the disk washer 40. The disk 20 has a disk- A reinforcing portion 24 surrounding the bent portion 32 of the packing 30 protrudes downward, Wherein the washer (40) is provided with a step portion (42) at an edge portion and the step portion (42) is fitted to the bent portion (32) of the disc packing (30) The bent portion 32 is separated from the outer peripheral surface of the step portion 42 of the disc washer 40. The end portion 32a of the bent portion 32 is separated from the disc washer 40 and the step portion 42, A pressure receiving space 42b is formed between the end portion 32a and the step 42a of the bending portion 32 so as to be spaced apart from the boundary step 42a of the communication hole 12, The bending portion 32 is received in the receiving space 42b and exerts an external force so that the outer surface of the bent portion 32 is brought into close contact with the seat ring 14. [
According to the present invention, the disc washer does not utilize the pressing force of the disc packing, but the U-shaped bent portion extended in the disc packing is detachable from the surface of the disc washer and formed a gap, In order to make the principle more efficient, the inner edge of the bent portion is formed in a curved shape so that the bent portion is easily deformed by the fluid pressure. By forming the corner of the seat ring in a round shape, The bending portion is less likely to be damaged at the edge of the seat ring by the sealing method by the sub-deformation, the length of the push bar 60 is adjusted to determine the pressing position of the locking lever 70, Even if the stopper for restricting the rotation of the disc is not provided, fluid sealing can be smoothly performed It is.

Description

[0001] Pre-action valve using U-shaped disk packing [0002]

A U-shaped disk packing is provided in which a bent portion of a U-shaped bent disk is deformed to receive a pressure of a fluid and is closely attached to a seat ring, thereby increasing a sealing efficiency as a hydraulic pressure is increased. To a ready-made actuated valve.

Generally, the water level detection device is divided into a wet type, a dry type, and a preparatory operation type. In the wet type water level detection device, the fluid remains in the primary side where the fluid (pressurized water) When the head of the sprinkler head (sealed type) is melted or detached by the fire, the secondary side pressure water is waterproofed when the head is opened. As the secondary pressure is lowered, the pressure switch activates the fire pump by sending a signal to the alarm device And the dry water flow detection device is in balance with the primary pressurized water by injecting nitrogen gas or compressed air into the valve, and when the head is opened by fire, the pressure is lowered and the chamber in the valve is opened, Side pressurized water.

In addition, the ready-operated valve maintains atmospheric pressure without water, gas, or compressed air on the secondary side. When a fire occurs, the detector sends an electric signal to operate the electric ball valve to send and receive fire extinguishing water to the head. .

Although all three methods are different, dry and ready operation systems have a commonality that the secondary side is not filled with water. Therefore, parking systems are required to install two systems except for the wet system which requires pressurized water due to the risk of freezing.

Figure 1 shows the construction of a conventional ready-made valve. According to this, a conventional ready-made valve has a body 10 having an inlet 12 and an outlet 12a.

The inlet 12 is defined as the primary side through which the fluid flows, and the outlet 12a is defined as the secondary through which the fluid is discharged. A communication hole 12 is formed between the inlet 12 and the outlet 12a and a cylindrical seat ring 14 is provided in the communication hole 12. [ The communicating hole 12 is configured to be selectively closed by the disc 20 acting on one axial side of the seat ring 14. [

One end of the disk 20 is rotatably coupled to the hinge 22 and the other end is formed as a free end so as to open and close the communication hole 12 by rotation. On one side of the disk 20, a disk packing 30 which is in contact with the seat ring 14 and is substantially hermetic is fixed by a disk washer 40 and a fixing screw 80.

An actuator 52 is fixed to the diaphragm 50. The actuator 52 is fixed to the diaphragm 50. The diaphragm 50 is fixed to the actuator 52, The hinge 72 is engaged with the body 10 to press the locking lever 70 to restrict the rotation of the disk 20 to the closed position. The side where the actuator is installed is defined as a tertiary side to which another pressure acts.

However, in the conventional preparatory operation valve having such a configuration, since the disk packing is formed in a planar shape and the free end of the disk 20 is held strongly by the locking lever 70 so as to suppress the primary side water pressure, There is a problem that a pressed mark of the seat ring 14 is generated in the disk packing 30. [

Also, since the force pressing the seat ring 14 at the fixed end and the free end of the disk packing 30 is different, the disk packing 30 is not constantly pressed.

Therefore, when the disc is once opened and then closed again, the trailing edge pressed by the seat ring 14 is located at another position of the disc packing 30 and is not returned to the same position and leakage occurs. Further, There is a problem that most of the sheet leakage occurs due to the fact that the elasticity of the disk packing 30 is lost.

On the other hand, there is a problem in that the height of the upper end of the seat ring 14 and the center of rotation of the disk 20 during the body processing are small and the machining is difficult to be performed because of a small tolerance to the hinge 22. That is, if the hinge 22 is low, the free end of the disc 20 is not pressed even if the locking lever 70 is pushed too far, and if the hinge 22 is high, water leaks from the fixed end of the disc It is.

Further, since the disc 20 to be pressed by the locking lever 70 is pressed infinitely without any resistance means, excessive force is applied to the disc packing, and eventually the pressure on the tertiary side changes (decreases) There is a problem that leakage occurs due to deformation of the disc packing.

The applicant of the present invention has filed and filed a "preparatory actuated valve" (Korean Registered Patent No. 10-1523886, Patent Document 1) in order to solve the problem caused in the prior art.

The patent document 1 discloses that a bending portion surrounding the edge of the disc washer is formed around the disc packing and a reinforcing portion for bending the bending portion of the disc packing protrudes downward and a stopper for restricting the disc rotation is formed, The strength was changed so that leakage did not occur even in the change of the primary side pressure intensity.

The configuration disclosed in Patent Document 1 is shown in Figs.

When the actuator 60 is actuated by the pressure applied to the tertiary side to push the locking lever 70, the locking lever 70 is rotated about the hinge 72 and the upper surface of the disk 20 is rotated And the disc 20 is rotated in the direction of closing the seat ring 14 about the hinge 22. The rotation of the disc 20 is restricted at a position where the lower end of the stopper 26 protruding downward from the free end is in contact with the body 10. [

Therefore, in the closed state, the contact distance between the disk packing 30 and the seat ring 14 is constantly maintained at a constant interval. When the disk packing 30 is rotated by the pressing of the locking lever 70, No strong contact occurs, and only the contact state is maintained.

In particular, since the stopper 26 is provided, even if the pressure acts on the tertiary side for a moment, the disk 20 is not pressed any more, so that the problem of the seat ring mark being left or damaged in the disk packing 30 can be prevented.

On the other hand, in the above-described state, a high water pressure of the inflow fluid acts on the surface of the disk washer 40 on the primary side. This action force pushes the disc packing 30 through the disc washer 40.

At this time, the disc packing 30, which is a rubber material, is compressed between the discs 20 and eventually expands radially outward. The disk packing 30 extending radially outward is caught by the reinforcing portion 24 of the disk 20 and fills the inner space of the reinforcing portion 24 and pushes the disk packing 30 downward, And comes into pressure contact with the upper surface of the ring (14).

Therefore, as the fluid pressure increases, the force acting on the disk packing 30 increases, and the contact force between the disk packing 30 and the seat ring 14 increases in proportion thereto. The airtightness becomes higher.

Patent Document 1 proposes that the premise of the improvement of the sealing performance due to the hydraulic pressure is that the pressing force of the disk washer 40 against the disk packing 30 is changed by the pressing force of the disk washer 40, (30) is expanded under the compressive force.

However, the fluid is resistant to the action of pushing the disc washer 40, as well as the stretching of the disc packing 30. [

This is because the extending portion is the bent portion 32, because the position of the bent portion 32 is located in the opposite direction to the direction of the hydraulic pressure.

Further, since the disc washer 40 is fixed to the center of the disc washer 40 through the fixing screw 80, the portion deformed due to the elasticity due to the pressure is located on the outer side rather than the center, so that when the outer side portion partially presses the disc packing 30 There is a problem that the bending portion 32 is prevented from stretching.

In this case, if the height of the stopper is high due to the machining tolerance, the bending portion 32 will not be pressed against the sheet 14, and if it is low, the bending portion 32 Is excessively pressed against the sheet 14 and the bent portion 32 is damaged.

KR 10-1523886 (May 5, 2015)

The pre-actuated valve provided with the U-shaped disk packing of the present invention is intended to solve the problems occurring in the related art as described above. The disk washer does not use the pressing force of the disk packing, but the U- The bending portion is separated from the surface of the disc washer and a clearance is formed, and the sheet ring is deformed outwardly by the hydraulic pressure so that the pressure sealing can be efficiently performed by pressing the seat ring.

In order to make this principle more efficient, the inner edge of the bent portion is formed in a curved shape so that the bent portion can be deformed well by the fluid pressure.

Further, by forming the corner of the seat ring in a round shape, the bending portion is less likely to be damaged at the corner of the seat ring by the sealing method by the bending portion deformation.

In addition, through the above-described principle, the fluid sealing can be smoothly performed even if the stopper for restricting the rotation of the disk is not provided.

The valve body of the present invention includes a body 10 having a communicating hole 12 formed inside thereof and a communicating hole 12 communicating with the communicating hole 12 of the body 10, And the other side is formed as a free end so that the outer surface of the seat ring 14 is selectively in contact with the seat ring 14 to selectively connect the communication hole 12 with the seat ring 14, A disc packing 30 disposed in contact with the outer surface of the disc 20 and contacting the seat ring 14 to maintain airtightness; And a disk washer 40 screwed to the disk 20 and a bending portion 32 surrounding the edge of the disk washer 40 is extended around the disk packing 30, The disk 20 is provided with a reinforcing portion 24 surrounding the bent portion 32 of the disk packing 30, And the stepped portion 42 is formed at the edge portion of the disc washer 40. The stepped portion 42 is fitted to the bent portion 32 of the disc packing 30 In the valve for preparatory operation, the bent portion 32 has an inner peripheral surface separated from an outer peripheral surface of the step portion 42 of the disc washer 40, and an end portion 32a of the bent portion 32 is separated from the disc washer A pressure receiving space 42b is formed between the end portion 32a of the bent portion 32 and the step 42a so as to be spaced apart from the boundary step 42a between the stepped portion 42 and the stepped portion 42, The fluid directed toward the inside is received in the pressure receiving space 42b so that the bending portion 32 exerts an external force so that the outer surface of the bending portion 32 is brought into close contact with the seat ring 14 .

In the above configuration, a rounded portion 32b formed in a curved shape is formed on the inner edge of the end portion 32a of the bent portion 32. [

A seat ring round portion 14a is formed on the inner edge of the seat ring 14. As shown in Fig.

In addition, the lower end of the free end side of the disk 20 is spaced apart from the upper side of the body 10 around the communication hole 12.

The inner surface of the bent portion 32 surrounding the step portion 42 is round in shape and the outer peripheral surface surrounded by the reinforcing portion 24 is formed of a polygonal shape.

According to the present invention, the disc washer does not utilize the pressing force of the disc packing, but the U-shaped bent portion extended in the disc packing is detachable from the surface of the disc washer and formed a gap, So that the pressure sealing can be performed efficiently.

In order to make this principle more efficient, the inner edge of the end portion of the bent portion is curved so that the bent portion is deformed by the fluid pressure.

Further, by forming the corner of the seat ring round, the bending portion is less likely to be damaged at the corner of the seat ring by the sealing method by the bending portion deformation.

In addition, even if the stopper for restricting the rotation of the disc is not provided through the above-described principle, the fluid sealing can be smoothly performed.

Figs. 1 to 4 are diagrams showing a configuration of a conventional preparatory operation valve. Fig.
5 is a cross-sectional view of a ready-made valve with a U-shaped disc packing of the present invention.
Fig. 6 is an operational view showing a modified example of the bent portion when fluid pressure is generated in Fig. 5;
FIG. 7 is an operational view showing a state in which the disc is rotated in the state of FIG. 6;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

5, the preparatory actuated valve provided with the U-shaped disk packing of the present invention includes a body 10 having a communicating hole 12 formed therein and a valve body 12 provided in the communicating hole 12 of the body 10 A seat ring 14 and a disc 20 for selectively opening and closing the communication hole 12. [

More specifically, the disc 20 is formed in a disc shape, one of which is rotatably coupled to the hinge 22 and the other is formed as a free end, Respectively.

On one side of the disk 20, a disk packing 30 which is in contact with the seat ring 14 and is substantially hermetic is fixed by a disk washer 40 and a fixing screw 80.

The disk packing 30 is made of a rubber material and is disposed in contact with one surface of the disk 20 and is in contact with the seat ring 14 to maintain airtightness.

The disk washer 40 is a metal material and is in contact with one side of the disk packing 30 and is fixed to the disk 20 with screws 80.

5, a bending portion 32 surrounding the edge of the disk washer 40 is extended around the disk packing 30, and the disk (not shown) 20 has a reinforcing portion 24 protruding downward to surround the bent portion 32 of the disc packing 30.

Accordingly, the disk packing 30 takes a U-shaped shape as shown in the drawing.

The disc washer 40 is formed with a step portion 42 at an edge portion and the step portion 42 is fitted to the bent portion 32 of the disc packing 30.

A stopper 26 for restricting the rotation of the disc 20 toward the seat ring 14 may be formed at the free end of the disc 20 so as to protrude downward as in the prior art shown in FIG.

The stopper (26) is configured such that its lower end surface abuts the body (10) around the communication hole (12).

However, if the stopper 26 is provided as described above, if the height of the seat ring 14 is higher due to the machining tolerance, the bending portion 32 may not be pressed against the seat ring Since the sealing is not performed, it is preferable that the stopper 26 is not provided as shown in FIGS.

In the drawings, reference symbol a denotes a primary side, reference symbol b denotes a secondary side, and reference numeral 3 denotes a tertiary side.

5 to 7, the bending portion 32 has an inner peripheral surface separated from the outer peripheral surface of the step portion 42 of the disc washer 40, The end portion 32a of the bent portion 32 is spaced apart from the boundary step 42a between the disc washer 40 and the step portion 42 so that the pressure difference between the end portion 32a of the bent portion 32 and the step 42a And a receiving space 42b is formed.

This configuration has a different function from the operation of Patent Document 1. [

That is, although Patent Literature 1 discloses a method in which the disk washer 40 presses the disk packing 30 to deform as described above, the present invention is not limited to the one in which the pressure receiving space 42b is formed 6, when the pressure of the fluid is applied to the inside of the body 10 from the side of the primary side a, that is, the communication hole 12, the bending portion 32 has an inner circumferential surface, The fluid is introduced into the pressure receiving space 42b while being separated from the outer circumferential surface of the stepped portion 42 so that the pressure is applied to the pressure receiving space 42b. As a result, the inner circumferential surface of the bent portion 32 and the stepped portion of the disk washer 40 The outer peripheral surface of the bent portion 32 is brought into close contact with the seat ring 14 by applying a force to the outer peripheral side of the bent portion 32 as shown in FIG.

Furthermore, when the fluid is introduced into the space between the bent portion and the outer end of the step portion 42 as the pressure of the fluid is increased, the contact between the bent portion 32 and the seat ring 14 by the pressure of the inflow water And becomes more robust.

Accordingly, the higher the pressure of the fluid is, the stronger the pressing force of the outer surface of the bent portion 32 against the upper end of the seat ring 14 becomes, and the higher sealing performance is obtained.

In addition, as shown in the figure, a curved round portion 32b may be formed in the inner edge of the end portion 32a of the bent portion 32. In this case, .

However, if the force applied to the bent portion 32 is strong, the folded portion 32 may be damaged by the upper edge of the seat ring 14 in the conventional structure.

In order to solve this problem, as shown in the figure, the seat ring round portion 14a is formed on the inner edge of the seat ring 14, so that the bending portion 32 is not easily damaged.

As shown in the drawing, the lower end of the free end side of the disk 20 is located above the body 10 around the communication hole 12, as shown in the drawing, It is good to be separated.

Particularly, the above-described configuration can be achieved by deforming the bent portion 32 corresponding to the respective pressures of the portion where the disk 20 is coupled to the hinge 22 and the portion formed as the free end, It is possible to exhibit sufficient sealing performance while preventing the possibility of damage.

In addition, the present invention is not limited to preventing the inflow of water in the case of a conventional alarm valve, but merely has a simple alarm function, but also has an alarm function and effectively prevents water inflow. It will have a big operational difference.

The inner surface of the bent portion 32 surrounding the step portion 42 is round and the outer peripheral surface surrounded by the reinforcing portion 24 may have a polygonal shape.

10: Body 12: Communicating ball
14: seat ring 14a: seat ring round section
20: Disk 22: Hinge
24: reinforcing portion 26: stopper
30: disk packing 32:
32a: end portion 32b: round portion
40: disk washer 42: step
42a: step 42b: pressure receiving space
50: diaphragm 52: cover
60: push bar 70: locking lever
72: hinge 74: return spring
80: Securing screw

Claims (6)

A body 10 having a communicating hole 12 formed therein,
A seat ring 14 provided on the communication hole 12 of the body 10,
A disc 20 which is hinged to one side of the body 10 and the other side of which is formed as a free end and whose outer side is in contact with the seat ring 14 selectively to open or close the communication hole 12,
A disk packing 30 disposed in contact with the outer surface of the disk 20 and contacting the seat ring 14 to maintain airtightness,
And a disc washer 40 contacting the outer surface of the disc packing 30 and screwed to the disc 20,
Around the disc packing 30, a bent portion 32 surrounding the edge of the disc washer 40 is extended,
The disk 20 has a reinforcing portion 24 protruding downward to surround the bent portion 32 of the disk packing 30,
The disk washer 40 is provided with a step portion 42 at an edge portion thereof and the step portion 42 is fitted into the bent portion 32 of the disk packing 30 ,
The inner peripheral surface of the bent portion 32 is separated from the outer peripheral surface of the step portion 42 of the disk washer 40,
The rounded portion 32b is formed in the inner edge of the end portion 32a of the bent portion 32,
The end portion 32a of the bent portion 32 is spaced apart from the boundary step 42a between the disc washer 40 and the step portion 42 so that the pressure difference between the end portion 32a of the bent portion 32 and the step 42a A receiving space 42b is formed,
The fluid flowing inward from the side of the communication hole 12 is received in the pressure receiving space 42b so that the bending portion 32 exerts a force to spread outward so that the outer surface of the bent portion 32 contacts the seat ring 14,
Characterized in that a seat ring round portion (14a) is formed on the inner edge of the seat ring (14)
Ready-action valve with U-shaped disc packing.
delete delete The method according to claim 1,
Characterized in that the free end side lower end of the disk (20) is spaced above the body (10) around the communication hole (12)
Ready-action valve with U-shaped disc packing.
The method according to claim 1,
Wherein the bent portion (32) has a rounded shape on the inner surface surrounding the step portion (42), and the outer peripheral surface surrounded by the reinforced portion (24)
Ready-action valve with U-shaped disc packing.
delete
KR1020160013188A 2016-02-03 2016-02-03 Pre-action valve using U-shaped disk packing KR101631050B1 (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
KR1020160013188A KR101631050B1 (en) 2016-02-03 2016-02-03 Pre-action valve using U-shaped disk packing

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102095179B1 (en) * 2019-02-12 2020-03-31 추승호 Valve structure which has improved durability and which is ease to assemble
KR20210088815A (en) 2020-01-07 2021-07-15 주식회사 비케이지트레이딩 Alarm Valve Assembly
EP3855050A4 (en) * 2019-11-25 2021-12-22 Ningjin Apc Industries Co., Ltd. Traction straight-through deluge valve main valve
KR20230099144A (en) 2021-12-27 2023-07-04 세웅소방기술 주식회사 preaction valve
KR102576059B1 (en) * 2022-04-28 2023-09-08 권영규 pre-action valve for fire fighting

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101523886B1 (en) 2014-11-28 2015-05-28 조시연 pre-action valve

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101523886B1 (en) 2014-11-28 2015-05-28 조시연 pre-action valve

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102095179B1 (en) * 2019-02-12 2020-03-31 추승호 Valve structure which has improved durability and which is ease to assemble
EP3855050A4 (en) * 2019-11-25 2021-12-22 Ningjin Apc Industries Co., Ltd. Traction straight-through deluge valve main valve
KR20210088815A (en) 2020-01-07 2021-07-15 주식회사 비케이지트레이딩 Alarm Valve Assembly
KR20230099144A (en) 2021-12-27 2023-07-04 세웅소방기술 주식회사 preaction valve
KR102576059B1 (en) * 2022-04-28 2023-09-08 권영규 pre-action valve for fire fighting

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