JPH04409Y2 - - Google Patents

Description

[Detailed explanation of the invention] Industrial application field In recent years, as the level of living and culture has improved, the demand for water heaters such as electric water heaters, gas/oil boilers, and solar water heaters has been increasing. The present invention relates to a pressure reducing valve used in these water heaters connected directly to the water supply system.

BACKGROUND ART As shown in FIG. 11, a conventional pressure reducing valve of this type includes a union joint 23, a primary strainer 24, a pressure reducing valve 25, and a primary water supply circuit 22 of a water heater 21.
The cheese 26, safety valve 27, etc. were connected by piping. The operation will be explained below. The filtered water supplied by the primary strainer 24 connected to the primary water supply circuit 22 via the union joint 23 is reduced to a predetermined water pressure by the pressure reducing valve 25, and then branched by the cheese 26. , the water heater 21 , and the water supply port 28 . Further, the expanded water in the water heater 21 is discharged from a safety valve 29 provided in the hot water supply circuit. If the safety valve 29 malfunctions due to a failure or abnormality, the safety valve 27 operates to protect the water heater 21 from destruction due to an abnormal increase in internal pressure. Further, the water supply branching by the cheese 26 makes the hot water supply and water supply pressures the same and improves the mixing characteristics at the faucet. In this way, the pressure reducing valve 25, the safety valves 27, 2
9. The water supply branch port is indispensable for safely and comfortably using the water heater 1 for a long period of time without trouble.

Problems to be solved by the invention However, in the above configuration, many piping connecting parts such as piping, cheeses, elbows, etc. are required to connect the individual element parts.
It had problems such as poor workability, trouble in procuring parts, variations in the level of construction technology, variations in reliability due to dust traps, poor maintenance, and poor piping space.

In addition, if the pressure reducing valve 25 is installed in the lower part in order to reduce the piping space and length, in an electric water heater etc., hot water may backflow from the water inlet 22 immediately after boiling, or from the water inlet 22 during a water outage. It also had problems in terms of usability and safety, such as backflow of hot water.

The present invention is intended to solve these conventional problems, and aims to provide a pressure reducing valve that is excellent in construction, maintainability, reliability, space saving, usability, and safety.

Means for Solving the Problems In order to solve the above problems, the pressure reducing valve of the present invention has a water supply inlet connection port and a check valve in the valve body, from the inflow side to the outflow side of the water. The pressure reducing mechanism section, the backflow resistance valve, and the water supply outlet connection port are arranged in the above order, and the secondary water supply branch port is branched from between the pressure reduction mechanism section and the backflow resistance valve.

Function: Due to the above-described structure, the present invention already has a water supply inlet connection port, a pressure reducing valve, a secondary water supply branch port, a safety valve, a water supply outlet connection port, etc. that are combined into one compact unit. There is no need to assemble the above-mentioned parts at the construction site as in the past, and it is possible to improve workability, space saving, reliability, maintainability, usability, safety, and cost performance.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings.

In Figures 1, 2, 3, and 10,
1 is a valve body of a pressure reducing valve, and this valve body 1 includes a pressure reducing mechanism section 2, a primary side strainer 3, a negative pressure operated valve 4,
Check valve 5, secondary water supply branch port 6, backflow resistance valve 7, safety valve 8, secondary strainer 9, water supply inlet connection port 1
0, the water supply outlet connection ports 11 are assembled and connected in the arrangement shown in FIG.

With the above configuration, a portion of the water filtered by the primary strainer 3 is supplied to the secondary water supply branch 6 through the check valve 5 and the pressure reducing mechanism 2, and the rest is supplied to the backflow resistance valve. 7, the secondary strainer 9 and the water supply outlet connection port 11 are supplied to the water heater 12 shown in FIG.

By the way, when the internal pressure on the water heater 12 side rises too much, the expanded water in the water heater 12 is filtered by the secondary strainer 9 and then discharged from the safety valve 8. In this case, it is conceivable that dirt and scale from inside the tank may adhere to the secondary strainer 9;
There is no problem because the water is washed in the forward direction. On the other hand, when the secondary faucet 13 is opened immediately after the water heater 12 is boiled, the hot water in the water heater 12 flows back from the secondary faucet 13 due to the difference between the set pressures of the pressure reducing mechanism section 2 and the safety valve 8. Although the hot water tries to be tapped, the backflow resistance valve 7 prevents this. Further, even if the secondary water tap 13 is opened inadvertently during a water outage, backflow of hot water can be prevented in the same way.

Note that the backflow resistance valve 7 is integrally coupled with the secondary strainer 9 and fitted into a part of the valve body 1. Further, as shown in FIG. 5, the backflow resistance valve 7 is made of a resilient material such as silicone rubber, fluorocarbon rubber, polyethylene, or polypropylene, and has an umbrella shape with an assembly protrusion 15A in the center. It is a check valve, and its protrusion is inserted and fixed into the central hole of the bottom plate of the cylindrical secondary strainer 9 as shown in FIG.
It is said that Note that 15 is a pore for pressure transmission. Here, its operation will be explained.

When water is not flowing, the backflow resistance valve 7 is stationary in the shape shown in FIG. 7, but when hot water is being tapped, it is reversed as shown in FIG. 8 due to the forward water flow and does not create water flow resistance. However, when the tap water stops flowing, it returns to its original shape due to its own elastic force. In addition, when the internal pressure of the water heater 12 increases due to boiling, or when the water is cut off,
As shown in FIG. 9, the backflow resistance valve 7 is in pressure contact with the valve seat on the bottom plate of the secondary strainer 9 and is in the closed state. Expanded water in the machine 12 will not flow back into the water tap 13.

As shown in FIG. 5, by providing the backflow resistance valve 7 with pressure transmission pores 15 that do not significantly impair the backflow prevention effect, stable secondary pressure can be detected and the secondary pressure can be detected with little fluctuation. It is something that can be controlled. Furthermore, there is no risk of backflow in actual use.

Furthermore, the pressure reduction mechanism section 2, the primary side strainer 3,
The negative pressure operating valve 4, check valve 5, backflow resistance valve 7, safety valve 8, secondary strainer 9, etc. are collectively connected to the valve body 1 of the pressure reducing valve, so there may be problems due to water quality or on-site piping work. Debris, foreign objects, etc. in the water
Problems caused by adhesion to the pressure reducing mechanism section 2, check valve 5, backflow resistance valve 7, and safety valve 8 are also eliminated, and the reliability of the pressure reducing valve and the ease of on-site piping work are improved.

Effects of the invention As described above, the pressure reducing valve of the present invention has a water supply inlet connection port, a check valve, a pressure reduction mechanism part, a secondary water supply branch port, a backflow resistance valve, a safety valve, and a water supply outlet connection port in the valve body of the pressure reduction valve. are installed in this order, which improves ease of construction, maintainability, reliability, space saving, usability, safety,
It has excellent cost performance and is extremely useful in practice.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the pressure reducing valve of the present invention.
Fig. 2 is a partial sectional view of the right side, Fig. 3 is a front view, Fig. 4 is a block layout diagram, Fig. 5 a is a perspective view showing an embodiment of the backflow resistance valve, and b is a cross section of the same. 6 is a perspective view showing an embodiment of the secondary strainer, FIG. 7, FIG. 8, and FIG. 9 are conceptual cross-sectional views for explaining the operating state of the backflow resistance valve. FIG. 11 is a block diagram showing an example of how the pressure reducing valve of the present invention is used in a hot water supply piping system, and FIG. 11 is a block diagram showing an example of how a conventional pressure reducing valve is used in a hot water supply piping system. 1... Valve body, 2... Pressure reducing mechanism section, 5... Check valve, 6... Secondary water supply branch port, 7... Backflow resistance valve,
8...Safety valve, 10...Water supply inlet connection port, 11...
...Water supply outlet connection port, 15...Small hole for pressure transmission.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In the valve body, from the inflow side to the outflow side, the water supply inlet connection port, the check valve, the pressure reducing mechanism, the backflow resistance valve, and the water supply outlet connection. and a secondary water supply branch port arranged in the above order, and a secondary water supply branch port is branched from between the pressure reducing mechanism section and the backflow resistance valve. (2) The pressure reducing valve according to claim 1 of the utility model registration claim, wherein the backflow resistance valve portion is provided with a pore for transmitting pressure. (3) The pressure reducing valve according to claim 1, wherein the backflow resistance valve is an umbrella-type check valve. (4) The pressure reducing valve according to claim 1 of the utility model registration claim, which includes a safety valve between the backflow resistance valve and the water supply outlet connection port.