JP5116435B2 - Pressure regulating valve and fire extinguishing equipment - Google Patents

Description

  The present invention relates to a fire extinguishing equipment that extinguishes a fire and a pressure regulating valve used in the fire extinguishing equipment.

  Conventionally, sprinkler fire extinguishing equipment is known as a representative example of fire extinguishing equipment. In sprinkler fire extinguishing equipment, a sprinkler head is usually attached to the secondary side pipe on the secondary side of the water flow detection device to fill the inside of the pipe.

  In recent years, a sprinkler fire extinguishing equipment having a pressure adjusting function that can maintain the pressure in the secondary side pipe with respect to the pressure fluctuation in the pipe has been developed. The sprinkler fire extinguishing equipment having a pressure regulation function includes a pressure relief valve and a pressure regulation valve as pressure regulation valves, and each is connected to a secondary side pipe (see Patent Document 1).

  The exhaust pressure valve opens when the pressure in the secondary side pipe becomes high, drains the water in the secondary side pipe to the outside, and reduces the pressure in the secondary side pipe. The pressure regulating valve opens when the pressure in the secondary side pipe becomes low, and supplies high-pressure water from the primary side pipe to the secondary side pipe to increase the pressure in the secondary side pipe. It is.

  FIG. 4 is a drawing schematically showing the exhaust pressure valve. 1 is an exhaust pressure valve, and 2 is its main body. The main body 2 has a spring chamber 3 on the upper side and a pressurizing chamber 4 on the lower side, and both chambers are partitioned by a diaphragm 5. Reference numeral 6 denotes a valve body, both ends of which are connected to the diaphragm by 5, and the other end side of the diaphragm 5 is fixed to the main body. The valve body 6 is pressed against the valve seat 8 by a spring 7 provided on the spring chamber 3 side. The valve seat 8 is provided below the main body 2, and an opening 9 is formed inside the valve seat 8. Normally, the valve body 6 closes the opening 9. A water inlet 10 is provided in the pressurizing chamber 4 and is connected to a filled secondary side pipe. Reference numeral 11 denotes a drain outlet formed at the lower end of the main body 2, which communicates with the opening 9 and is connected to the drain pipe.

The operation of the exhaust pressure valve 1 will be described. Normally, the valve body 6 is pressed against the valve seat 8 by the spring 7 and the opening 9 is closed, so that the water in the secondary side pipe reaches the pressurizing chamber 4, but the drain 11 Will not be drained from. Here, when the pressure in the secondary side pipe becomes high, the water pressure in the pressurizing chamber 4 increases, and the valve body 6 is pushed upward against the spring 7. Thereby, the opening 9 is opened, the water in the pressurizing chamber 4 is drained from the drain port 11, and the water pressure in the pressurizing chamber 4 is lowered. Then, the force of the spring 7 is increased, and the valve body 6 is again pressed against the valve seat 8 to close the opening 9. As described above, when the pressure in the secondary side pipe becomes high, the exhaust pressure valve 1 opens, drains the water in the secondary side pipe to the outside, and reduces the pressure in the secondary side pipe.
JP 11-4907 A

  When there is dust in the pipe, the secondary pipe becomes high pressure, and the valve body opens, when this dust passes from the inlet port to the drain port between the valve body and the valve seat, It may be caught. In this case, the dust is sandwiched between the valve seat and the valve body, and the valve body is pressed by the spring, so that the sandwiched state is maintained. As a result, the opening is not completely blocked, and there arises a problem that water in the secondary side pipe continues to be drained through the pressurizing chamber. SUMMARY OF THE INVENTION An object of the present invention is to prevent the pressure regulating valve from biting dust.

A first invention is a pressure regulating valve used in a fire extinguishing equipment, a main body partitioned by a diaphragm into a spring chamber and a pressurizing chamber, a spring provided on the sealed spring chamber side, A valve body provided in the center of the diaphragm, biased by the spring , and provided in the pressurizing chamber so as to face the valve body, and an opening formed inside by being pressed against the opposing valve body is closed. a valve seat which, the provided pressure chamber, a water inlet connected to a pipe which is filled with water, the pressure regulating valve and a drain port connected to the drain pipe in communication with the opening, the When the water pressure in the pressurizing chamber increases, the valve body opens against the biasing force of the spring. The valve body is recessed below the valve seat around the opening , and the water in the pipe is shaved into the passing water. dust from falling the dust by its weight if it contains dust cake like A groove for fit, is characterized in that as the dust does not get caught between the valve body and the valve seat.

The second invention, comprising: a water flow detection device, provided on the secondary side of the flow water sensing unit, and a secondary pipe which is filled with water, and a head attached to the secondary pipe extinguishing The facility further comprises the pressure regulating valve according to claim 1 as a pressure reducing valve having a pressurizing chamber connected to the secondary side pipe and a drain outlet connected to a drain pipe, and the pressure reducing valve and the secondary The connecting pipe that connects the side pipe is provided with a water control valve that is always open and a strainer for removing dust.

  According to a first aspect of the present invention, in the pressure regulating valve including a valve body that closes the opening formed inside the valve seat, a dust storage groove recessed downward from the valve seat is provided around the opening. For this reason, when water passes from the water inlet to the drain through the opening, if the passing water contains dust, it falls into the recessed groove due to the weight of the dust, and the dust falls into the groove. Will stay. Therefore, since only water without dust passes through the opening, it is possible to prevent the valve body from biting dust when the water pressure in the pressurizing chamber is lowered and the valve body is lowered.

  Further, according to the second aspect of the present invention, in the sprinkler fire extinguishing equipment provided with the exhaust pressure valve, since the water control valve that is always open is provided in the connection pipe that connects the exhaust pressure valve and the secondary side pipe, At this time, by closing the water control valve and then passing water to the secondary side pipe, it is possible to prevent water mixed with a lot of dust from flowing into the pressure relief valve. Can prevent biting of garbage.

  In addition, since a strainer for dust removal is provided, when water flows from the secondary side pipe to the drain pipe through the exhaust pressure valve as the pressure in the secondary side pipe rises, the water flowing into the secondary side pipe After the contained dust is removed by the strainer, it can flow to the exhaust pressure valve side. For this reason, it becomes possible to further prevent the exhaust pressure valve from being bitten by dust.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of an exhaust pressure valve as an example of the pressure regulating valve of the present invention, and FIG. 2 is a partially enlarged cross-sectional view of FIG. In the figure, the same parts as those of the prior art are denoted by the same reference numerals and the description thereof is omitted.

  1 and 2, the exhaust pressure valve 1c is composed of a main body having a spring chamber 3 on the upper side and a pressurizing chamber 4 on the lower side, like the conventional exhaust pressure valve 1 shown in FIG. The chamber is partitioned by a valve body 6 and a diaphragm 5. The main body 2 is configured by fixing the upper case to the lower main body with screws. The valve body 6 includes an upper valve body and a lower valve body, and is connected in the vertical direction and sandwiches one end of the diaphragm 5. The other end of the diaphragm 5 is sandwiched between the lower body and the upper case. The valve body 6 is pressed against the valve seat 8 by a spring 7 provided on the spring chamber 3 side.

  The valve seat 8 is provided below the main body 2, an opening 9 is formed inside the valve seat 8, and is normally closed by the valve body 6. The valve seat 8 is in pressure contact with a rubber sheet portion provided at the center of the lower portion of the valve body 6. A water inlet 10 communicates with the pressurizing chamber 4 and is connected to a filled secondary side pipe. A drain outlet 11 is formed at the lower end of the main body 2 and communicates with the opening 9 to which a drain pipe is connected.

A feature of the present invention is that a recess recessed below the height of the valve seat 8 is formed around the opening 9, that is, in the outer peripheral direction of the valve seat 8, and this recess is an annular groove 20 for collecting dust. It is. The width of the groove 20 is substantially equal to the inner diameter of the water conduit that communicates the pressurizing chamber 4 and the water inlet 10, and is approximately half the inner diameter of the drain outlet 11. Further, the depth of the groove 20 is slightly smaller than the width of the groove 20. The width and depth of the groove 20 can be changed as appropriate, but it is desired that the depth is sufficiently deeper than at least the height of the valve seat 8 and that dust can be secured.

  In the exhaust pressure valve 1c, when the pressure in the secondary side pipe becomes high, the water pressure in the pressurizing chamber 4 increases, the water pressure affects the diaphragm 5, and the valve body 6 is pushed up against the spring 7. By opening the valve body 6, the water in the pressurizing chamber 4 is drained from the drain port 11, the water pressure in the pressurizing chamber 4 is lowered, and as a result, the pressure in the secondary side pipe is lowered. Due to the decrease in pressure, the valve body 6 is pressed against the valve seat 8 by the spring 7 and closes the opening 9.

  Thus, when the valve body 6 is opened, water passes from the water inlet 10 to the drain outlet 11 through the opening 9. At this time, if the passing water contains dust, the dust passes through the water inlet 10 and then falls into the recessed groove 20 in the pressurizing chamber 4 due to the weight of the dust. Will remain in the groove 20. Here, water continues to flow, but since the depth of the groove 20 is sufficiently deep, dust cannot flow out of the groove 20 and cannot reach the valve seat 8 or the opening 9. Therefore, since only water without dust passes through the opening 9, it is possible to prevent the valve body 6 from biting dust when the water pressure in the pressurizing chamber 4 is lowered and the valve body 6 is lowered.

  As described above, it is possible to prevent the exhaust pressure valve 1 from biting dust, but it is possible to prevent the exhaust pressure valve 1 from biting dust more by improving the system of the sprinkler fire extinguishing equipment in which the exhaust pressure valve 1 is used. it can. FIG. 3 is a system diagram of a sprinkler fire extinguishing facility as a fire extinguishing facility using the exhaust pressure valve 1 of FIGS. This sprinkler fire extinguishing equipment has a pressure regulating function that makes the pressure of the secondary side pipe constant by the exhaust pressure valve 1 and the pressure regulating valve.

  In this figure, 19 is a running water detection device, the secondary side piping 21 is provided in the secondary side, and the primary side piping 22 is provided in the primary side. On the proximal end side of the primary side pipe 22, a pressurized water supply device including a water tank, a pump, and the like (not shown) is provided. The secondary side piping 21 is filled with water, and a sprinkler head as a head (not shown) is attached.

  The pressurizing chamber 4 of the exhaust pressure valve 1 is connected via a secondary side pipe 21 and a connection pipe 23. The connection pipe 23 is provided with a water control valve 25 that is always open for maintenance on the secondary side pipe 21 side, and a strainer 26 for dust removal on the exhaust pressure valve 1 side.

Reference numeral 27 denotes a drain pipe, one end of which is connected to the secondary chamber of the flowing water detector 19 , and a drain valve 28 that is normally closed is provided in the middle of the pipe. In the drain pipe 27, the secondary side of the drain valve 28 and the drain port 11 of the drain pressure valve 1 are connected via a pipe. With this configuration, when the water pressure in the secondary side pipe 21 is increased and the valve body 6 of the exhaust pressure valve 1 is opened, water is drained from the other end side of the drain pipe 27.

  In sprinkler fire extinguishing equipment, piping is cut to the required length and connected, so shavings, etc. at that time remain in the pipe. Pass water and clean the inside. If it is normal equipment, the terminal test valve provided at the end of the secondary pipe 21 is opened and water is passed through the secondary pipe 21 to remove dust such as dust substances and chips in the pipe. To do.

  When water is poured into the pipe at the first stage of installation of this equipment, there is a large amount of dust in the pipe. Therefore, if water is allowed to flow through the exhaust pressure valve 1 or the like, dust biting is likely to occur. Therefore, at the time of initial water flow of this facility, the water control valve 25 of the connection pipe 23 is closed, and then water is passed to the secondary side pipe 21. Since the water control valve 25 is closed, water does not flow through the exhaust pressure valve 1, so that the exhaust pressure valve 1 can be prevented from biting dust.

  In addition, since the strainer 26 is provided in the connection pipe 23, the pressure in the secondary side pipe 21 is increased during normal times, and water is supplied from the secondary side pipe 21 to the drain pipe 27 via the exhaust pressure valve 1. When the water flows, the strainer 26 can remove dust contained in the water. For this reason, it becomes possible to further prevent the exhaust pressure valve 1 from being bitten by dust.

  In this embodiment, the exhaust pressure valve is used as the pressure adjustment valve. However, the present invention may be applied to another pressure adjustment valve such as a pressure adjustment pilot valve. Further, although the sprinkler fire extinguishing equipment has been described as the fire extinguishing equipment, the present invention may be applied to other fire extinguishing equipment such as a foam fire extinguishing equipment.

It is a longitudinal cross-sectional view of the exhaust pressure valve of this invention. It is a partially expanded sectional view of FIG. It is a system diagram of the fire extinguishing equipment using the exhaust pressure valve. It is a longitudinal cross-sectional view of the exhaust pressure valve of a prior art.

Explanation of symbols

1 exhaust valve, 2 body, 3 spring chamber, 4 pressurizing chamber,
5 Diaphragm, 6 Valve body, 7 Spring, 8 Valve seat,
9 opening, 10 water inlet, 11 drainage port,
19 Flowing water detection device, 20 groove, 21 secondary side piping,
22 Primary piping, 23 Connection piping, 25 Water control valve,
26 Strainer, 27 Drain pipe, 28 Drain valve,
S sprinkler head, tt

Claims (2)

A pressure regulating valve used in fire extinguishing equipment,
A main body partitioned by a diaphragm into a spring chamber and a pressurizing chamber;
A spring provided on the side of the sealed spring chamber;
A valve body provided at the center of the diaphragm and biased by the spring;
A valve seat that is provided in the pressurizing chamber so as to face the valve body, is pressed against the opposing valve body, and an opening formed therein is closed;
A water inlet provided in the pressurizing chamber and connected to a filled pipe;
A drain outlet connected to the drain pipe in communication with the opening;
A pressure regulating valve comprising:
The valve body opens against the urging force of the spring when the water pressure in the pressurizing chamber increases.
A recess is provided around the opening so as to be recessed below the valve seat, and when the passing water contains dust such as shavings in the pipe, a dust storage groove into which the dust falls due to its weight, A pressure regulating valve characterized by preventing the dust from being caught between a valve seat and the valve body. In fire extinguishing equipment provided with a running water detection device, a secondary side pipe provided on the secondary side of the running water detection device and filled with water, and a head attached to the secondary side piping,
The pressure regulating valve according to claim 1 is further provided as a pressure reducing valve having a pressurizing chamber connected to the secondary side pipe and a drain port connected to the drain pipe, and the pressure reducing valve, the secondary side pipe, A fire extinguishing system, characterized in that a water control valve that is always open and a strainer for dust removal are provided in the connection pipe that connects the pipe.