JPH0436711B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an automatic valve used in fire extinguishing systems for buildings, tunnels, plants, etc., and more specifically to a straight type automatic valve that can be used even in narrow spaces.

Conventional technology There are two types of automatic valves used in fire extinguishing equipment, etc.: pressurized release type automatic valves and pressure reduction release type automatic valves.In this pressurized release type automatic valve, both the main valve and the main piston receive water pressure on the primary side. , seated due to the difference in pressure receiving area,
The valve is configured to close and open by changing the back pressure of the main piston to change the above-mentioned received pressure difference, and adjust the degree of opening when the valve is opened to reduce the secondary water pressure. is adjustable, and the main valve and main piston are operated with primary water pressure in a large opening chamber, and when the valve is opened, primary water pressure is applied to the back pressure side of the main piston, neutralizing the previous pressurization of the main piston. There is a structure that allows a large valve-opening force to be obtained. (Tokuko Akira
(Refer to No. 53-533) In addition, as a pressure reduction release type automatic valve, an opening that communicates with the water conveyance section is provided on the opposite surface of the water conveyance section opening, and a valve that opens and closes the passage is arranged at an appropriate distance from the opening. There is one in which the valves are cylinder-shaped and have an appropriate length. (Refer to Utility Model Publication No. 47-10398) Problems to be Solved by the Invention Conventional automatic valves have a structure in which the valve part operates perpendicularly to the direction of water flow, so all of them have a protrusion larger than the diameter of the flange. It has a department. Therefore, it requires a large space to install, making it impossible to install it in narrow places such as tunnels.

Furthermore, in these automatic valves, the flow path is greatly bent when the valve is opened, resulting in a large pressure loss.

Furthermore, these automatic valves can only be used as either a pressure release type or a pressure reduction release type.

Means for Solving the Problems The present invention partitions a first chamber and a second chamber facing each other in the axial direction by a valve seat having an opening formed therein; A cylinder chamber having a cylinder with a larger diameter than the opening is provided, a hollow piston passing through the cylinder chamber is fitted into the opening, the tip of the piston on the second chamber side is closed with a valve umbrella, and the valve seat of the piston is closed. A communication hole is provided in the first chamber, and a flange valve with a larger pressure receiving area than the valve head is provided on the piston on the first chamber side.
The flange valve is slidably fitted to the cylinder to form a depressurization chamber and a pressurization chamber, and a first hole is provided to communicate the decompression chamber and the outside of the machine, and the pressurization chamber and the outside of the machine are communicated. This is a straight type automatic valve characterized in that it is provided with a second hole for closing the valve.

Function: In the case of depressurization release, pressurized fluid is supplied to the decompression chamber through the first hole, and the difference between the pressure acting on the flange valve and the pressure of the fluid in the first chamber acting on the valve head causes the valve head to open. is seated on the valve seat, blocking the communication path and cutting off communication between the first and second chambers, but the pressurized fluid in the decompression chamber flows out from the first hole and the fluid pressure acting on the flange valve causes the valve head to When the applied pressure becomes large, the valve head separates from the valve seat and opens a communication passage, the first chamber and the second chamber communicate with each other, and the fluid in the first chamber flows out into the second chamber.

In addition, in the case of pressurized release, the valve umbrella is pushed by the pressurized fluid in the second chamber and sits on the valve seat, blocking the communication path and cutting off communication between the second chamber and the first chamber. When pressurized fluid is supplied to the pressurizing chamber and fluid pressure is applied to the flange valve, the flange valve slides on the cylinder and rises, and the valve head moves away from the valve seat to open a communication path and connect the second chamber and the first chamber. The chambers communicate and fluid in the second chamber flows into the first chamber.

Embodiments Embodiments of the present invention will be described with reference to the accompanying drawings, and the same reference numerals in the drawings have the same names and functions.

In the figure, 1 is a first chamber, 2 is a second chamber facing the first chamber in the axial direction, 3 and 4 are flanges connecting the first chamber and the second chamber, and 5 is a valve with an opening 6 formed in the center. A seat 7 is a valve body, which includes a hollow piston 9 inserted into the opening 6, a valve umbrella 8 that closes the tip of the piston 9 and is located on the second chamber 2 side, and a valve body 8 that is located at the rear of the piston 9. It consists of a flange valve 10 provided at the end and having a larger pressure receiving area than the valve head 8, and a plurality of communication holes 11 provided in the valve seat portion of the piston 9. 12 is a cylinder chamber, 13 is a first cylinder having a larger diameter than the opening 6 of the valve seat 5;
0 are slidably fitted to form a decompression chamber 14 and a pressurization chamber 15.
is formed. A first hole 16 communicating with the outside of the machine is formed near the valve seat of the decompression chamber 14, and a second hole 18 communicating with the outside of the machine is formed in the second cylinder 17 side of the pressurizing chamber 15.
form.

Although the straight type automatic valve of this embodiment can be used for both a pressure release type and a pressure release type, the pressure reduction release type will be explained first with reference to FIG. 1.

1st chamber side main pipe 19, branch pipe 20, orifice 21
The pressurized chamber 15 is connected to the first hole 16 through the second hole.
It is communicated with the atmosphere through the hole 18.

When the pilot valve 22 for valve opening control is closed and pressurized fluid such as fire extinguishing water is allowed to flow into the main pipe 19, the pressurized fluid flows in the direction of arrow A7 and presses the valve head 8 of the valve body 7. Decompression chamber 14 through first hole 16
Flow pressure in the direction of arrow A10 is applied to the flange valve 10, but since the pressure receiving area of the flange valve 10 is formed larger than the pressure receiving area of the valve head 8, the pressure receiving area of the flange valve 10 is larger than that of the valve head 8.
A large force is applied to the

Therefore, the flange valve 10 moves in the direction opposite to the arrow A7 direction while sliding on the first cylinder 13, so the valve body 7 moves from the position 8A in the opposite direction to the arrow A7 direction, and the valve body 7 moves to the valve seat 5 in the opposite direction to the arrow A7 direction. The umbrella 8 is seated and the communication hole 11 is opened.
is closed to cut off communication between the first and second chambers.

Also, when the pilot valve 22 for valve opening control is opened,
The pressurized fluid in the decompression chamber flows out from the discharge pipe 23 through the first hole 16 and reduces the pressure in the decompression chamber 14, and the pressure in the A10 direction in the decompression chamber 14 is changed to the force in the A7 direction, that is, the valve umbrella 8. When the fluid pressure becomes smaller than the fluid pressure applied to , the valve element 7 moves in the direction of arrow A7 and stops when the flange valve 8 stops at the upper part 12a of the cylinder chamber 12, and the valve head 8 becomes the state 8A, and the valve body 7 moves in the direction of arrow A7. Since the communication hole 11 is formed apart from the first
The chamber 1 and the second chamber 2 communicate with each other, and the pressurized fluid in the first chamber side main pipe 19 flows out into the second chamber side main pipe 24 .

Note that atmospheric pressure is applied inside the pressurized chamber.

Next, to explain the pressurized open type with reference to FIG. 2, the second chamber side main pipe 24 is connected to the second hole 18 via the branch pipe 20 and the pilot valve 22 for valve opening control, and the pressure-reducing chamber is opened. 14 is communicated with the atmosphere through the first hole 16.

When the pilot valve 22 for valve opening control is closed and the pilot valve 25 for valve closing control, for example, a solenoid valve, is opened to flow pressurized fluid such as fire extinguishing water into the main pipe 24 on the second room side, the pressure is increased. Pressure fluid flows in the direction of arrow A7,
Press the valve head 8 of the valve body 7. Therefore, the valve body 7 is 8
Proceed in direction A7 from position A, and place valve umbrella 8 on valve seat 5.
is seated, the communication hole 11 is closed, and communication between the second chamber and the first chamber is cut off.

Note that when the spring 26 is stretched between the valve seat 5 and the flange valve 10 in the decompression chamber, the spring 26
Since the valve body 7 is moved in the direction of the arrow A26 by the restoring force of the valve body 8, even if the supply of pressurized fluid is stopped midway, or if the flow velocity is slow and the force to press the main valve 7 is insufficient, the valve body 8 completely seats on the valve seat 5 and closes the communication hole 11.

Further, when the pilot valve 22 for valve opening control is opened and the pilot valve 25 for valve closing control is closed, the pressurized fluid in the second chamber side main pipe 24 flows in the direction of arrow A7 and simultaneously presses the valve body 7. It enters the pressurizing chamber 15 through the second hole 18 and applies a force in the direction opposite to the arrow A7 to the collar valve 10, but since the pressure receiving area of the collar valve 10 is larger than the pressure receiving area of the valve cap 8, the valve cap A larger force is applied to the tsuba valve 10 than to the tsuba valve 8.

Therefore, the valve body 7 advances in the direction opposite to the arrow A7 direction, and when the flange valve 8 stops at the upper part 12a of the cylinder chamber, it enters the state of 8A and separates from the valve seat 5 to open the communication hole 11. The second chamber 2 and the first chamber 1 communicate with each other, and the pressurized fluid in the second chamber main pipe 24 flows out into the first chamber main pipe 19 .

Note that atmospheric pressure is applied inside the decompression chamber.

Effects of the Invention The present invention has a first chamber and a second chamber facing each other in the axial direction.
The first chamber is partitioned by a valve seat having an opening, and the first chamber is provided with a cylinder chamber that faces the opening and has a cylinder having a larger diameter than the opening, and the opening has a hollow piston that penetrates the cylinder chamber. mated and the second
The piston on the chamber side is provided with a valve head and a communication hole, and the piston on the first chamber side is provided with a flange valve that has a larger pressure-receiving area than the valve head, and the flange valve is slidably fitted into the cylinder. The outer diameter is approximately the same as the diameter of the flange, and the communication path can be opened and closed along the water flow direction.

Therefore, since there is no protrusion like in the conventional example, it is compact and can be used easily in narrow spaces.In addition, there are fewer bends in the flow path from the primary side to the secondary side, so the pressure is lower than that of the conventional example. Less loss.

In addition, a first hole is provided to communicate the decompression chamber with the outside of the machine, and a second hole is provided to communicate the pressurization chamber with the outside of the machine.
Since the holes are provided, when the first hole is communicated with the primary side main pipe, it becomes a pressure reduction release type automatic valve, and when the second hole is communicated, it becomes a pressurization release type automatic valve.

Therefore, the automatic valve of the present invention can be used for both pressure release type and depressurization release type.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention, Fig. 2
The figure is a longitudinal sectional view showing another embodiment. 1...First chamber, 2...Second chamber, 5...Valve seat, 6
...opening, 7...valve body, 8...valve head, 9...piston, 10...flange valve, 11...communication hole, 12...
...Cylinder chamber, 13...First cylinder, 14...
Decompression chamber, 15... Pressurization chamber, 16... First hole, 17
...Second cylinder, 18...Second hole, 26...Spring.

Claims (1)

[Claims] 1. A first chamber and a second chamber facing each other in the axial direction are partitioned by a valve seat having an opening, and the first chamber has a valve seat that faces the opening and has a larger diameter than the opening. A cylinder chamber having a cylinder is provided, a hollow piston passing through the cylinder chamber is fitted into the opening, the tip of the piston on the second chamber side is closed with a valve umbrella, and a communication hole is formed in the valve seat of the piston. A flange valve having a larger pressure receiving area than the valve head is provided on the piston on the first chamber side, and the flange valve is slidably fitted to the cylinder to form a decompression chamber and a pressurization chamber, and the decompression chamber and the pressurization chamber are formed. A straight type automatic valve, characterized in that a first hole is provided for communicating with the outside of the machine, and a second hole is provided for communicating the pressurizing chamber with the outside of the machine. 2. The straight type automatic valve according to claim 1, wherein the pressure reducing chamber has a spring stretched between the valve seat and the flange valve. 2. The straight type automatic valve according to claim 1, wherein the communication hole is provided in a sliding portion with an opening of a hollow piston. 3. The straight type automatic valve according to claim 1, wherein the pressure reducing chamber has a spring stretched between the valve seat and the flange valve.