JP2015194950A - Reduction valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breakage of an inlet chamber wall due to freezing of an upstream side.SOLUTION: A reduction valve actuates a main valve 40 by displacement of a diaphram 31 by pressure fluctuation of a water outflow port 21 for reducing water pressure from a water inflow port 11 toward the water outflow port, and a release valve 50 is positioned on a side opposite to the water inflow port with respect to the main valve 40, on the water inlet chamber. Freezing of the water inlet chamber progresses gradually from the water inflow port side toward a depth side, and a side opposite to the water inflow port is frozen the latest, so that the vicinity of the release valve disposed on the side opposite to the water inflow port is not frozen even when the water inflow port side is frozen, and following to freezing from the water inflow port side, water pressure in the vicinity of the release valve is increased gradually. Therefore, when the water pressure reaches a required value, the release valve is released and the pressure is reduced, for suppressing breakage of the inlet chamber wall as much as possible. The required pressure during release, is optionally set based on an experiment in consideration of proof pressure of a valve box (inlet chamber wall). The proof pressure becomes lower when the material of the valve box is made of resin, compared with the case that the material is metal.

Description

  The present invention relates to a pressure reducing valve used in a hot water supply facility or the like, and more particularly, to a pressure reducing valve that prevents damage to a valve box due to freezing of a water pipe upstream of a water hammer or a water heater.

For example, a hot water supply facility is provided with a pressure reducing valve for supplying tap water to a hot water storage tank having a heater at an appropriate pressure (see Patent Document 1, paragraphs 0008 to 0009 and FIG. 1).
The pressure reducing valve, for example, partitions the inside of the valve box into an inlet chamber having a water inlet, an outlet chamber having a water outlet and a diaphragm chamber (pressure sensing chamber) by a partition, and the diaphragm chamber and the outlet chamber communicate with each other. A through hole is formed in the partition wall from the inlet chamber to the outlet chamber, and a pressure regulating valve mechanism that is operated by the diaphragm of the diaphragm chamber is configured in the through hole (Patent Document 1, Paragraph 0010, FIG. 2, Patent Document 2). (See paragraphs 0002 and 0008, FIG. 1).
This pressure reducing valve distributes water from the water inlet to the water outlet through the pressure regulating valve mechanism, and operates the pressure regulating mechanism valve by the displacement of the diaphragm due to the pressure fluctuation of the water outlet to adjust the water pressure from the water inlet to the water outlet. The pressure is adjusted and tap water is supplied at an appropriate pressure downstream (see paragraph 0011 of Patent Document 1).

In such a pressure reducing valve, when a water hammer occurs in the water pipe on the upstream side or the pipe line freezes when the valve is closed, the water hammer pressure or water freezes and expands in the inlet chamber of the valve box. Pressure is applied and the wall of the inlet chamber may be damaged by the pressure. In particular, when the valve box is made of resin, the risk is high.
For this reason, conventionally, a mechanism has been proposed in which a water hammer or pressure due to freezing and expansion is released from the inlet chamber into the inlet chamber.
As an example of the mechanism, there is a passage provided in the wall of the inlet chamber, and a valve is provided in the passage to release the pressure to the outside when abnormal pressure such as freezing and expansion occurs in the inlet chamber. (See Patent Document 1, Paragraphs 0010 and 0012, FIG. 2, Paragraph 0016, FIG. 3, Patent Document Paragraphs 0009 and 0012, FIG. 1 and FIG. 2).

JP 2008-186106 A JP 2013-142945 A

The valve for releasing the abnormal pressure in the conventional pressure reducing valve is located on the water inlet side of the inlet chamber (see FIGS. 2 and 3 of Patent Document 1 and FIG. 1A of Patent Document 2).
However, since freezing gradually occurs in the inlet chamber from the water inlet (opening) side toward the back, even if the water inlet side of the inlet chamber is frozen, the back is often not frozen. For this reason, if the vicinity of the relief valve freezes first, the action of the relief valve is not performed, and if the entire inlet chamber is frozen by finally freezing to the back side of the inlet chamber, the volume of the water is about Since it is going to expand about 10%, an inlet chamber wall may be damaged.

  This invention makes it a subject to prevent the failure | damage of the inlet chamber wall by the said freezing under the above actual condition.

In order to achieve the above object, the present invention pays attention to the fact that the above-mentioned freezing gradually occurs from the water flow inlet side toward the back, and the relief valve is used as a pressure regulating valve (the regulating valve mechanism) in the inlet chamber. On the other hand, it is located on the opposite side of the water inlet.
As mentioned above, the freezing of the inlet chamber gradually occurs from the water inlet side toward the back, and the opposite side of the water inlet freezes the slowest, so the vicinity of the relief valve located on the opposite side is the water inlet Even if the side freezes, the water pressure gradually increases with freezing from the water inlet side without immediately freezing. For this reason, when the water pressure reaches a required value, the relief valve is opened, the pressure in the inlet chamber can be lowered, and damage to the inlet chamber wall can be suppressed as much as possible. The required pressure at the time of opening is appropriately set by experiment or the like in consideration of the pressure resistance of the valve box (inlet chamber wall). The pressure resistance depends on the valve box material, but is lower in the case of resin than in the case of metal.

  As a configuration of the present invention, the inside of the valve box is partitioned by a partition into an inlet chamber having a water inlet, an outlet chamber having a water outlet, and a diaphragm chamber. The diaphragm chamber and the outlet chamber communicate with each other, and the outlet from the inlet chamber A through-hole is formed in the partition wall to the chamber, and a pressure regulating main valve is formed in the through-hole, and water is circulated from the water inlet to the water outlet through the main valve, and the diaphragm is displaced by the pressure variation of the water outlet. In the pressure reducing valve that operates the main valve to reduce the water pressure from the water inlet to the water outlet, the relief valve is provided in the partition located on the opposite side of the water inlet to the main valve in the inlet chamber. Can be adopted.

The through hole may be located at any position of the partition wall from the entrance chamber to the exit chamber, but if formed in the partition wall between the entrance chamber and the diaphragm chamber (see the embodiment in FIG. 1), it is described in Patent Documents 1 and 2. Unlike the pressure reducing valve, the valve box can be downsized because it does not have a cylinder mechanism.
In addition, the relief valve may be at any position as long as it is located on the opposite side of the water flow inlet with respect to the main valve in the inlet chamber, but usually, the partition located on the opposite side is divided between the inlet chamber and the outlet chamber. It becomes a partition between them. When the partition wall is between the two, a relief valve is provided in the partition wall, and the outlet port of the relief valve can be opened (facing) to the outlet chamber. In this way, when the outlet (drainage) port of the relief valve is opened to the outlet chamber, the drain water from the relief valve is processed in the piping of the hot water supply equipment, etc., so that treatment with a drain hose or the like becomes unnecessary, and the valve An O-ring for preventing water leakage to the outside of the box is also unnecessary. Normally, a hot water supply facility is provided with a valve for avoiding abnormal pressure when water pressure from a pressure reducing valve or the like becomes abnormal. However, the outlet of the relief valve may be any as long as it is outside the inlet chamber.

  Since the present invention is configured as described above, it is possible to prevent damage to the inlet chamber wall due to freezing.

Sectional drawing at the time of valve closing of one Embodiment of the pressure reducing valve which concerns on this invention Sectional view at the time of valve opening of the embodiment Action explanatory diagram of the same embodiment Sectional view of the other embodiment Sectional view of the other embodiment Cross-sectional view of yet another embodiment

1 to 3 show an embodiment of a pressure reducing valve A according to the present invention. This pressure reducing valve A supplies tap water to a hot water storage tank having a heater at an appropriate pressure in the hot water supply facility described in Patent Document 1. It is attached to do.
As shown in FIGS. 1 and 2, the pressure reducing valve A has a structure in which an inlet chamber 10 having a water inlet 11 serving as a primary side of a water pipe is formed by a partition wall 2 in a valve box 1 which is a resin molded product. An outlet chamber 20 having a water outlet 21 on the next side and a diaphragm chamber (pressure sensitive chamber) 30 are partitioned.
A through hole 3 is formed in the partition wall 2 between the inlet chamber 10 and the diaphragm chamber 30, and a main valve 40 is provided in the through hole 3.

  The main valve 40 includes an annular valve seat member 42 that is water-tightly fitted in the through hole 3 with an O-ring 41 interposed therebetween, and a valve body member 43 that is positioned below the valve seat member 42. The inner peripheral edge of the valve seat member 42 on the inlet chamber 10 side is a valve seat 42a, and a valve body valve seat 43a made of rubber packing is fitted into a portion of the valve body member 43 facing the valve seat 42a. The valve body member 43 is fitted to the cylindrical portion 44 in the valve box 1 through the O-ring 41 so as to be movable in the vertical direction, and is urged toward the valve seat member 42 by the support spring 45.

  A valve shaft 46 is fitted on the central axis of the valve body member 43, and the valve shaft 46 is divided into a member on the valve body member 43 side and a member on the diaphragm chamber 30 side, and both are screwed together to be integrated. ing. The valve body member side member is fixed to the valve body member 43 by a bolt 46 a, and the diaphragm chamber side member is nut-fastened at the center of the diaphragm 31. A diaphragm retainer 32 is fixed to the upper surface of the diaphragm 31 by the nut fastening, and a coil-shaped pressure adjusting spring 33 is provided around the axis of the diaphragm 31 on the upper surface. The upper end of the pressure adjusting spring 33 is in contact with a pressure adjusting screw 35 screwed into the upper wall of the valve box 1 via a spring receiver 34. By adjusting the screwing degree of the pressure adjusting screw 35, the urging force of the spring 33 to the diaphragm 31 is adjusted. That is, the opening degree of the main valve 40 is adjusted.

Relief to the partition wall 2 located on the opposite side of the water inlet 11 with respect to the main valve 40 in the inlet chamber 10 (the inlet chamber 10 positioned in the axial direction of the water inlet 11 and the water outlet 21 and the partition wall 2 of the outlet chamber 20). A valve 50 is provided.
As shown in FIG. 3, the relief valve 50 includes a cylindrical valve body 51, a rubber packing 52 that forms a valve body fitted in the head of the valve body 51, and the valve body 51 in the cylinder axis direction. It consists of a cylindrical valve lid member 53 housed movably, and a coiled pressure regulating spring 54 that is loaded in the valve body 51 and interposed between the lid member 53 and the valve body 51. The lid member 53 is fitted into the mounting cylindrical portion 2a of the relief valve 50 of the partition wall 2 with a gap 55 in front thereof.

  When the relief valve 50 is attached (fitted), the relief valve 50 is located on the same axis as the inlet chamber 10 and the outlet chamber 20, and the relief valve 50 is assembled from the outlet chamber 20. This assembly eliminates the need to form a new assembly portion outside the valve box 1 and can be made compact. If the water outlet (discharge) port of the relief valve 40 faces the outlet chamber 20, it does not have to be on the same axis, but the axis of the relief valve 50 and the axis of the outlet chamber 20 are It is preferable that they are parallel.

  The valve body 51 has a spline shaft-like outer peripheral surface or a non-circular cross section or the like, and a gap extending over the entire length of the valve body head outer periphery is shown in FIG. As described above, when the packing 52 is separated from the valve seat of the partition wall 2, the water a in the inlet chamber 10 reaches from the valve hole 56 of the partition wall 2 through the gap on the outer periphery of the valve body head into the lid member 53. It flows out to the outlet chamber 20 through the through hole 57 of the lid member 53. A plurality of through holes 57 are provided around the wall of the lid member 53.

  The water a from the diaphragm chamber 30 flows into the lid member 53 through the gap 55 in front of the lid member 53, and the water pressure is applied to the valve body 51. For this reason, the biasing force of the spring 54 is applied to the packing 52 before the peripheral wall of the inlet chamber 10 cannot withstand the water pressure of the inlet chamber 10 and breaks (cracks) in consideration of the applied pressure. It sets by experiment etc. so that it may leave | separate from the valve seat of the partition 2.

The pressure reducing valve A of this embodiment is configured as described above. As shown in FIG. 1, when water is not used on the downstream side, the sum of the urging force of the support spring 45 and the water pressures of both the inlet chamber 10 and the diaphragm chamber 30. Exceeds the urging force of the pressure regulating spring 33, and the main valve 40 is closed (closed). In this closed state, when water is used on the downstream side, the water pressure in the outlet chamber 20 decreases, and the water pressure in the diaphragm chamber 30 communicating with the outlet chamber 20 also decreases.
Then, as shown in FIG. 2, the biasing force of the pressure regulating spring 33 is greater than the sum of the biasing force of the support spring 45 and the water pressures of both the inlet chamber 10 and the diaphragm chamber 30. The valve body member 43 of the main valve 40 is pushed down through the valve shaft 46, the valve body valve seat 43a is separated from the valve seat 42a, and the main valve 40 is opened (opened). For this reason, water a flows from the upstream side (primary side) to the downstream side (secondary side) from the inlet chamber 10 through the through-hole 3, the diaphragm chamber 30, and the outlet chamber 20 (state of FIG. 2).

During this use, the water pressure in the outlet chamber 20 changes according to the amount of water used on the downstream side, and the diaphragm 31 expands and contracts in response to the change (bends up and down in FIG. 1). The degree of opening and closing of the valve 40 (the degree of clearance between the valve seats 42a and 43a) is adjusted, and water (water having an appropriate pressure) not more than a predetermined pressure is supplied downstream.
In this way, water of a required pressure is supplied to the downstream side by the pressure reducing valve A, and when the use is stopped, the water pressure in the outlet chamber 20 rises, the water pressure in the diaphragm chamber 30 also rises, and the support spring 45 eventually. The sum of the urging force and the water pressures of the inlet chamber 10 and the diaphragm chamber 30 exceeds the urging force of the pressure adjusting spring 33, the diaphragm 31 is bent upward, and the main valve 40 is closed (state shown in FIG. 1).

  In the valve-closed state shown in FIG. 1, because the upstream side is made of an iron pipe or the like and exposed to the outside, when the water in the pipe starts to freeze, the freezing is deepened from the water inlet 11 side. It occurs gradually (to the relief valve 50). For this reason, in the vicinity of the relief valve 50, the water pressure gradually increases with freezing from the water inlet 11 side without freezing even if the water inlet 11 side freezes. When the water pressure reaches a required value, the valve body 51 of the relief valve 50 is pushed against the spring 54 through the hole 56 by the water pressure, as shown in FIGS. 50 opens and releases the water pressure to the outlet chamber 20. By this escape action, an increase in the water pressure in the inlet chamber 10 is suppressed, and the wall is prevented from being cracked or broken. The increase in the water pressure in the outlet chamber 20 is suppressed by the relief valve of the downstream hot water supply equipment.

When the freezing of the inlet chamber 10 is eliminated, the water pressure is lowered, so that the valve body 51 of the relief valve 50 is returned by the spring 54 and closed as shown in FIG.
If for some reason a water hammer occurs on the upstream side, the water pressure in the inlet chamber 10 increases, and the relief valve 50 is opened by the increased pressure to release the pressure and cause cracks or breakage of the valve box 1. To prevent.

In the above embodiment, the flowing water from the relief valve 50 is guided to the outlet chamber 20, but may be guided to the outside of the valve box 1 as shown in FIG. 4. In this case, a drain pipe or the like is connected to the outlet (drain port) of the relief valve 50 so as to flow to an appropriate place. The embodiment of FIG. 1 and the like has an advantage that this drain pipe is unnecessary.
Further, as an embodiment of the relief valve 50, as shown in FIG. 5, a cylindrical valve main body 51 ′, a ball-shaped valve body 52 ′ and a pressure adjusting spring 54 ′ loaded in the main body 51 ′, a lid member 53 ′, A conventionally well-known configuration such as a relief valve 50 'composed of

In the pressure reducing valves shown in Patent Documents 1 and 2, as shown in FIG. 6, if the relief valves 50 and 50 'of the present invention are formed in the partition wall 2 of the inlet chamber 10 and the outlet chamber 20, the relief valve is provided. Is located on the opposite side of the water inlet 11 with respect to the pressure regulating valve (main valve 40), and the effects of the present invention can be obtained. In FIG. 6, the same reference numerals as those in the above-described embodiments denote the same components. Except for the relief valves 50 and 50 ′, each member of Patent Documents 1 and 2, such as the piston head 60 (“32” in the same document), etc. Have the same configuration.
Thus, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Valve box 2 Partition 3 Partition through-hole 10 Inlet chamber 11 Water inlet 20 Outlet chamber 21 Water outlet 30 Diaphragm chamber 31 Diaphragm 33 Pressure regulating spring 35 Pressure regulating screw 40 Main valve 42 Valve seat member 43 Main valve body 45 Support springs 50, 50 'Relief valve 51, 51' Valve body 52, 52 'Relief valve body 54, 54' Tuning pressure spring A Reducing valve a Water

Claims (3)

The inside of the valve box (1) is partitioned by a partition wall (2) into an inlet chamber (10) having a water inlet (11), an outlet chamber (20) having a water outlet (21), and a diaphragm chamber (30), and the diaphragm chamber (30) communicates with the outlet chamber (20), a through hole (3) is formed in the partition wall (2) from the inlet chamber (10) to the outlet chamber (20), and the through hole (3) is formed. A pressure regulating main valve (40) is constructed, and water (a) is circulated from the water inlet (11) through the main valve (40) to the water outlet (21), and a diaphragm due to pressure fluctuation at the water outlet (21). In the pressure reducing valve that operates the main valve (40) by the displacement of (31) and adjusts the water pressure from the water inlet (11) to the water outlet (21) to be reduced,
A pressure reducing valve provided with a relief valve (50) in the partition wall (2) located on the opposite side of the water inlet (11) with respect to the main valve (40) in the inlet chamber (10).   The through hole (3) is formed in the partition wall (2) between the inlet chamber (10) and the diaphragm chamber (30), and the relief valve (50) is connected to the inlet chamber (10) and the diaphragm chamber (30). The pressure reducing valve according to claim 1, wherein the pressure reducing valve is formed in the partition wall (2).   The pressure reducing valve according to claim 1 or 2, wherein a water outlet of the relief valve (50) is opened to the outlet chamber (20).

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