JPH0454490Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pressure regulating valve for regulating fluid pressure, particularly the pressure of water flowing in a pipe, within a predetermined range.

[Conventional technology]

Traditionally, water supply systems are often directly connected to various devices such as electric water heaters, oil/gas hot water boilers, small oil water heaters, gas instantaneous water heaters, etc., and the supply water pressure is required to be within a predetermined range. , for example, 0.6 to 0.65 using a pressure reducing valve etc.
Adjustments are made to Kg/ ^cm2 , etc.

In such a conventional pressure reducing valve, for example, as shown in FIG. It is designed to be supplied from the next port 7. A diaphragm 8 is installed on one side wall of the secondary chamber 6 so as to receive the water pressure in the secondary chamber, and a valve rod 9 is installed so as to be able to slide through the partition wall between the primary chamber and the secondary chamber. The main valve body 9a is configured to be driven through the main valve body 9a. In this pressure reducing valve, when the pressure in the secondary chamber increases, the valve stem 9 is pulled upward, and the main valve element 9a provided on the valve stem 9 is moved to the main valve seat 5.
is starting to close. The pressure inside the secondary chamber is controlled by the main spring 1 installed behind the diaphragm 8.
The zero compression force is adjusted by rotating the spring receiver 11. However, such pressure reducing valves do not have an adjustment function when the secondary pressure is too high, so it is only possible to adjust the water pressure within a specified range by installing another relief valve on the secondary side. It was possible.

Therefore, a pressure regulating valve with a structure as shown in FIG. 3 has been proposed as a pressure regulating valve that also has a relief valve function. When the next pressure increases, the valve seat 8a separates from the relief valve body 9b provided at the end of the valve stem 9, and the fluid exits through the discharge chamber 12 to the outside.

However, although these valves are all equipped with a strainer 2, it is difficult to completely prevent small particles from entering the valve.
Limescale, dirt, etc. become trapped in sliding parts such as the O-ring 13 provided around the valve stem 9, increasing sliding resistance, which not only causes the pressure reducing valve to close incompletely, but also causes the relief valve to close. This causes the inconvenience that the fluid continues to flow out without stopping. In such cases, conventionally the only option was to manually remove the debris that had clogged the pressure reducing valve.

[The problem that the idea aims to solve]

The present invention aims to eliminate the above-mentioned inconveniences and provide a pressure regulating valve with a relief valve function that automatically removes trapped dirt and the like.

[Means to solve the problem]

The pressure regulating valve of the present invention that can achieve such a purpose includes a main valve provided between a primary chamber and a secondary chamber, and a diaphragm provided in the center of a diaphragm that partitions the secondary chamber and the relief chamber. A pressure regulating valve is provided with a relief valve, and is configured such that the main valve opens when the pressure in the secondary chamber decreases, and the relief valve opens when the pressure in the secondary chamber increases. A main valve body, a relief valve body, and an opening limit means for the relief valve are provided on a valve stem that slidably penetrates the wall between the chamber and the pressure regulating valve. A relief valve body and relief valve opening limit means are provided on both sides of a diaphragm with a valve seat of the relief valve in between.

[Effect]

In the pressure regulating valve of the present invention, when the sliding part of the valve stem becomes clogged with foreign matter and becomes difficult to move,
If the main valve does not close completely and the secondary pressure increases, the relief valve opens first and fluid flows out into the discharge chamber, but the relief valve is limited by the opening limit means and does not open wide. Therefore, the secondary pressure further increases and pushes up the diaphragm, and also pulls up the valve stem via the opening limit means, so the dust clogging is cleared as soon as the main valve is closed, and as the secondary pressure decreases, the valve stem is also lifted up. The relief valve and main valve also return to normal operation.

Furthermore, even if the clog is not cleared, the main valve remains closed, so fluid will not continue to flow out from the relief valve.

〔Example〕

An example of the pressure regulating valve of the present invention will be explained with reference to FIG.

In this example, the structure of the primary chamber, secondary chamber, main valve, relief valve, etc. is almost the same as that of the conventional pressure regulating valve shown in FIG. A connecting bolt 9c is attached so as to pass through the center of the opening limit means 9d, thereby fixing the opening limiting means 9d so as to face the relief valve body 9b with the diaphragm 8 in between. The opening limiting means 9d is installed so that the distance between the surface facing the relief valve 9b is slightly larger than the thickness of the valve seat portion of the diaphragm 8, and
It is formed in such a shape that even when it makes contact with the relief valve, the fluid passing through the relief valve cannot be prevented from flowing into the discharge chamber 12.

When using the pressure regulating valve of the present invention to regulate the pressure of water supply, for example, rotate the spring receiver 11 so that the primary pressure is 3.5 Kg/cm ² and the secondary pressure is about 0.85 Kg/cm ² . Adjust the main spring 10. At this time, as the secondary pressure rises and approaches the set pressure, the diaphragm 8 is pushed up, but the main valve body 9a is pushed up by the valve spring 14, so the relief valve body 9b comes into contact with the valve seat 8a. The main valve is throttled while the relief valve remains closed.

Furthermore, if the sliding resistance of the valve stem 9 increases due to clogging with dirt, etc., only the diaphragm 8 will be pushed up and the relief valve will open without throttling the main valve. Since the valve stem 9 is pulled up by the diaphragm 8 to come into contact with the degree limiting means 9d, the main valve is forced closed while the relief valve remains slightly open. Therefore, when the secondary pressure decreases, the relief valve is also closed, and as a result of the primary pressure pushing the main valve element 9a, the main valve opens, returning to the normal operating state.

[Effect of idea]

The pressure regulating valve of the present invention includes a conventional main valve provided between a primary chamber and a secondary chamber, and a relief valve provided in the center of a diaphragm that partitions the secondary chamber and the relief chamber. A pressure regulating valve configured such that the main valve opens when the pressure in the next chamber decreases, and the relief valve opens when the pressure in the secondary chamber increases, is improved so that the pressure between the primary chamber and the secondary chamber is increased. A main valve body, a relief valve body, and means for restricting the opening of the relief valve are installed on both sides of the diaphragm with the valve seat of the relief valve in between, on a valve stem that slidably penetrates the wall. It has the advantage of automatically removing debris and restoring the system even when it becomes difficult to operate, and the loss of water and other water in such a case is minimal.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of an example of the pressure regulating valve of the present invention, and FIGS. 2 and 3 are structural diagrams of a conventional pressure regulating valve. 1...Primary port, 2...Strainer, 3...Check valve, 4...Primary chamber, 5...Main valve seat, 6...Secondary chamber, 7...Secondary port, 8...Diaphragm, 8a...
...Relief valve seat, 9...Valve stem, 9a...Main valve body, 9
b...Relief valve body, 9c...Connection bolt, 9d...
... Opening limit means, 10 ... Main spring, 11 ... Spring receiver, 12 ... Discharge chamber, 13 ... O-ring, 14
...Valve spring.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A main valve provided between a primary chamber and a secondary chamber, and a relief valve provided in the center of a diaphragm separating the secondary chamber and the relief chamber; A wall between the primary chamber and the secondary chamber in a pressure regulating valve configured such that a decrease in pressure in the secondary chamber causes the main valve to open and an increase in pressure in the secondary chamber causes the relief valve to open. 1. A pressure regulating valve characterized in that a main valve body, a relief valve body, and an opening degree limiting means for the relief valve are provided on a valve stem that slidably passes through the valve stem. (2) The pressure regulating valve according to claim 1, wherein a relief valve body and an opening limit means for the relief valve are provided on both sides of a diaphragm with a valve seat of the relief valve in between.