JPS6127377A - Automatic pressure regulation valve - Google Patents

Abstract

PURPOSE:To prevent mixture of cold and hot waters by providing a hot water side valve body for reducing the primary pressure and a cold water side valve body. CONSTITUTION:Piston 15 will slide through the differential pressure between secondary pressure chambers 13, 14 while the valve bodies 11, 12 will perform open/ close operation of flow path reverse proportionally thus to maintain secondary pressure of hot and cold waters uniform. Since sealing member is provided to the piston 15, mixture of hot and cold waters is prevented while since secondary pressure of hot and cold water after pressure reduction is applied onto the piston 15, the pressure level will be low and the differential pressure is also low. Consequently, mixing of hot and cold waters can be prevented completely while the load to be applied onto the sealing member can be reduced to suppress the sliding resistance to the minimum.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an automatic pressure regulating valve that is mainly provided immediately before a hot water mixing device to adjust the pressure of hot water and stabilize the function of the hot water mixing device. .

Conventional Structure and Problems There has been a conventional automatic pressure regulating valve of this type as shown in FIG.

In FIG. 1, 3 connected to the inside of cylinder 1
There are two pistons 2.3.4, and the hot water sent from the hot water side primary flow path 5 passes through the center of the piston 2, is depressurized, flows out to the hot water side secondary flow path 6, and flows through the water side primary flow path. The water sent from 7 passes through the center of the piston 4, is depressurized, and flows out to the water side secondary flow path 8.

Since the pressure receiving areas of the pistons 2.3.4 are configured to be equal, the primary pressures of hot water and water in the flow path 5.7 cancel each other out between the pistons, and the primary pressures of the hot water and water in the flow path 6.8 cancel each other out.
The piston moves due to the next pressure difference. Said secondary flow path6.
8, the piston becomes stable when the secondary pressure becomes equal, and when the other pressure fluctuates, the piston moves in the direction of equalizing it, thereby changing the rate of decompression of the primary pressure and increasing the pressure of the secondary pressure. This is called death by equal pressure. However, such a conventional configuration has the following problems.

(1) Since there is no sealing material on the piston that passes through the hot water side flow path and the water side flow path, there is a possibility that hot water and water may get mixed in.

(2) High-precision machining is required for the cylinder and piston, and minute variations and dimensional errors are not allowed. .

(3) In the gap between the cylinder L piston, minute fluid constituents may precipitate and easily cause scale adhesion, which may impair functionality.

OBJECT OF THE INVENTION The present invention solves the problems of the conventional art, and aims to provide an automatic pressure regulating valve that prevents mixing of hot water and water, does not adhere to scale, has excellent durability, and can be mass-produced at low cost. The purpose is

Structure of the Invention In order to achieve this object, the present invention has a hot water side flow path, a water side flow path, and a hot water side valve body and a water side valve body that reduce the primary pressure of these two flow paths. , these two valve bodies have a structure that allows for a balance between the two valve bodies.

The hot water side secondary royal room and the water side 2 are depressurized by the above two valve bodies.
and a piston operated by a pressure difference between these two secondary royal chambers and connected to the two valve bodies;
A sealing material is provided on the piston to prevent hot water and water from entering the piston.

In operation, the piston slides due to the force difference between the two coalfields after pressure reduction, and the two connected valve bodies open and close the flow passages in inverse proportion to each other, reducing the secondary pressure on the hot water side and the secondary pressure on the water side. This stabilizes the pressure difference.

Description of examples Hereinafter, one embodiment of the present invention will be described using FIG. 2.

It has a hot water side flow path 9, a water side flow path 10, a hot water side valve body 11 and a water side valve body 12 that reduce the primary pressure of these two flow paths, and after the hot water side valve body 11, a hot water side 2 is provided. Secondary pressure chamber 13, water side valve body 1
A water-side secondary pressure chamber 14 is provided after 2, and there is a piston 15 that operates due to the pressure difference between these two secondary pressure chambers. and are connected. The splintered hot water side valve body 11;
The water side valve body 12 has a pressure-balanced configuration, so that the primary pressure of hot water and water is balanced by the shape of the valve body, and the secondary pressure is balanced by the shape of the hot water side valve body. 11
A back pressure chamber 16 on the pumping hot water side into which secondary pressure on the hot water side is introduced to the rear of the valve body 12 , and a Narcissus back pressure chamber 1 into which secondary pressure on the water side is introduced into the rear of the water side valve body 12
7 was installed to balance the secondary pressure of hot water and water.

In such a configuration, there is a gap between the hot water side back pressure chamber 16 and the water side back pressure chamber 17, which are the secondary pressure introduction parts that introduce the secondary pressure, and the hot water side flow path 9 and the water side flow path 10. Although it is customary to use a sealing material, the pressure regulating valve installed just before the hot water mixing device is
It is required to operate sensitively to even the slightest disruption of the power balance.

Therefore, a structure was adopted in which no sealing material was used so as not to cause sliding resistance.

” In the configuration described above, the two secondary pressure chambers 13 and 14
The piston 15 slides due to the pressure difference, and the two valve bodies 11 and 12 connected to each other operate to open and close the flow passage in inverse proportion to keep the secondary pressures of hot water and water equal. do.

Since the piston 15 is provided with a sealing material, it is possible to prevent hot water and water from getting mixed in. Since the piston is subjected to the secondary pressure after depressurizing the hot water and water, the pressure level is low and the differential pressure is also small. As a result, the load applied to the sealing material can be reduced, and the sliding resistance can also be minimized. Furthermore, since a Teflon ring is used as the sealing material, the sliding movement is smooth, and the function as a pressure regulating valve is that of constant current.

In addition, since the two valve bodies are configured with a balanced capacity, the valve body will not receive any direct load from sudden fluctuations in the primary and secondary pressures of hot water and water. It is able to respond sensitively to even the slightest disruption of the two-coal field balance and maintain stable functionality.

In the configuration of the above embodiment, the pressure regulating valve operates so that the secondary pressures of hot water and water are equal, but if the pressure on the hot water side is extremely low, the pressure on the water side will be adjusted to match the hot water side. However, if a pressure regulating valve is provided just before the hot water mixing device, a large amount of mixed hot water cannot be obtained. Therefore, by providing springs to bias the hot water side valve body and the water side valve body, and making the set loads of the springs asymmetric between the hot water side and the water side, the pressure can be regulated with a certain degree of pressure difference. For example, by setting the secondary pressure on the water side high and increasing the cent load of the spring on the hot water side, the amount of mixed hot water will be greater than when the load is the same.

Effects of the Invention As described above, the automatic pressure regulating valve of the present invention provides the following effects.

(1) In addition to providing a sealing material on the histone, the piston is in contact with the secondary pressure of hot water and water, so the pressure before and after the sealing material is small, and the pressure difference is minute, so there is no possibility of contamination of hot water or water. Furthermore, since there is no sealing material between the cylinder and piston, there is no need for high-precision machining of the cylinder and piston, allowing mass production at low cost.

(2) The piston is directly actuated by the secondary pressure difference between the water side and the hot water side, and the reduced pressure level of the primary pressure is controlled, so high pressure is not applied to the sealing material and sliding resistance is minimized. This allows it to respond sensitively to minute imbalances in secondary pressure.

(3) Since both the hot water side valve body and the water side valve body have a pressure-balanced structure, the valve body does not receive any load even when sudden changes in the water side primary pressure and the hot water side primary pressure occur. , can maintain stable functionality.

(Brown) Because the structure is simple and compact, it is easy to integrate with a hot water mixing device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional automatic pressure regulating valve, and FIG. 2 is a sectional view showing an embodiment of the automatic pressure regulating valve of the present invention. 9... Hot water side flow path, 10... Water side flow path,
11...Hot water side valve body, 12 Water side valve body, 13...
...Hot water side secondary pressure chamber, 14...Water side secondary pressure chamber,
15...Piston, 18...Sealing material.

Claims (2)

[Claims] (1) A hot water side flow path, a water side flow path, a hot water side valve body and a water side valve body configured to reduce the primary pressure of these two flow paths, each having a pressure balance, and the hot water side valve. It has a hot water side secondary pressure chamber and a water side secondary pressure chamber provided after the body and the water side valve body, and a piston filled with a sealing material that is activated by the pressure difference between these two secondary pressure chambers. The side valve body and the water side valve body are symmetrically connected to the piston, and the automatic pressure regulating valve opens and closes the flow passage in inverse proportion to the secondary pressure difference after pressure reduction. (2) The automatic pressure regulating valve according to claim 1, wherein the sealing material is a Teflon ring.