JP2767550B2 - Pressure reducing valve for tap water - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a pressure reducing valve (constant pressure valve) for tap water used to reduce the pressure of tap water to a predetermined pressure. A pressure receiving body that operates by sensing the pressure on the secondary side is provided, and a spring that is pushed out to the secondary side is connected to the pressure receiving body, and a valve seat provided on a valve box is provided on a front end side facing the primary side. The present invention relates to an improvement on a tap water pressure reducing valve in the form of a single-shaft pressure reducing valve provided with a cylindrical valve body.

[0002]

2. Description of the Related Art The pressure of tap water has been increasing with the rise of buildings, so if this high-pressure tap water is used directly, it is difficult to control the amount of water discharged.
In addition, there is a problem that the water hammer phenomenon becomes serious. For this reason, a pressure reducing valve (constant pressure valve for water supply) is provided at a place where each household enters from a water main through a branch pipe, and high-pressure tap water is used at a pressure of 2-3 kg / cm ^2. ing. In particular, in high-rise apartments, the use of this tap water reducing valve is required to eliminate the pressure difference between the upper floor and the lower floor.

A conventional pressure reducing valve A for tap water used in this manner is disclosed in, for example, Japanese Patent Laid-Open No. 62-62.
065, specifically, FIG.
As shown in the figure, a pressure-sensitive body 2 formed in a cylindrical shape so as to move in the axial direction by sensing the pressure on the secondary side y of the case 1 is incorporated in a case 1 which is a valve box formed in a pipe shape, The front end of the pressure sensing element 2 facing the primary side w is connected to the base end of the valve element 3 of the cylindrical side seal valve, and the valve seat 4 faces the opening edge of the front end of the valve element 3. The valve seat metal fitting 5 for holding the
A spring 6 for pushing the pressure-sensitive element 2 toward the secondary side y is integrally mounted on the outer peripheral portion of the valve body 3 of the cylindrical side seal valve in the case 1. It is installed in a spring chamber z formed so as to be shielded from the side w, and the spring chamber z communicates with the outside of the case 1 through a communication hole 10, and
The connecting cylinders 11 and 12 are formed at the end of the secondary side w and the end of the secondary side y, respectively, to form a single-shaft pressure reducing valve.

[0004] Thus, the connecting cylinders 11 and 12
Is connected to the pipe on the primary side w and the pipe on the secondary side y, when tap water is supplied from the primary side w, and when the pressure on the secondary side y reaches a predetermined pressure, pressure-sensitive Body 2
Is pushed into the primary side w against the bias of the spring 6, and the opening edge 30 of the front end of the cylindrical valve body 3 continuous with the front end side of the pressure sensing body 2 abuts against the valve seat 4. Then, the communication between the primary side w and the secondary side y is interrupted by the cylindrical side wall surface of the valve body 3 so that the pressure on the secondary side y is maintained at a predetermined pressure set by the spring 6. It is.

Further, the conventional pressure reducing valve A for tap water configured as described above uses a large pressure reducing valve used for a boiler or the like as a base and a set pressure thereof is changed. As a result, not only is the size large and the cost is high, but also, first, the sealing performance of the valve is poor, and second, when the flow rate is changed from a small flow rate to a large flow rate, and from a large flow rate to a small flow rate. When the flow rate is changed, there is a problem that hysteresis for the flow rate change is poor, and thirdly, a change in pressure on the secondary side is large with respect to the flow rate change.

For this reason, when configuring the pressure reducing valve A for tap water, as shown in FIG. 2, the applicant has a connecting cylinder portion 11 connected to the primary side w at one end and a connecting cylinder 11 at the other end. Secondary side y
A cylindrical pressure receiving body 2 that moves in the axial direction due to a change in pressure on the secondary side y is fitted into a pipe-shaped valve box 1 having a connection cylindrical portion 12 connected to the secondary side y. The pressure sensitive element 2 is provided with a valve body 3 formed on a cylindrical side seal valve at the front end side of the pressure sensitive body 2 facing the primary side w, and a portion closer to the primary side in the case 1. In addition, a valve seat metal fitting 5 for holding a valve seat 4 abutting against an opening edge 30 at the front end of the cylindrical valve body 3 is formed separately from the case 1 and is movably fitted in the axial direction of the case 1. The valve seat 5 is assembled at a predetermined position by a stop ring a for preventing movement to the primary side and a spacer b for suppressing movement to the secondary side. b, a small gap D exists between the valve seat 5 and the valve seat 5 to maintain a degree of freedom. Watertight holding member 7 interposed between the inner peripheral surface of the outer peripheral surface and the casing 1 of the pressure sensitive element 2 fitted movably direction
Is fitted in an annular groove c formed on the inner peripheral surface of the case 1 to form the outer peripheral surface of the pressure-sensitive body 2 as a smooth surface.
The cylindrical wall 3a of the valve body 3 of the cylindrical side seal valve provided on the front end side of the pressure sensitive body 2 fitted movably in the axial direction in the case 1
It is formed to a thickness of 1 mm or less, and has an opening edge 3 at the front end thereof.
A means has been developed for forming the end face of 0 as a semicircular surface in a side cross section, and has been filed as Japanese Patent Application No. 6-27398.

[0007]

The pressure reducing valve A for tap water described above is either of the conventional type shown in FIG. 1 or the improved type developed by the applicant shown in FIG. However, since it is connected to the pipe as a single pressure reducing valve and used, the pressure reducing valve is increased by one, and the space is required by the increased pressure reducing valve, and in fact, As shown in FIGS. 3 and 4, the pipe B between the stop valve stv and the water meter M is cut in the middle and the pressure reducing valve A is connected thereto, or the stop valve stv and the water tap C are connected to each other. The piping B is cut in the middle and the pressure reducing valve A is assembled there. Therefore, in piping work, there is a problem that it takes time to connect the pressure reducing valve A to the pipe B. is there.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems occurring in the above-mentioned prior art means and prior art means, and provides a pressure reducing valve for tap water and a space for assembling the same. It is another object of the present invention to provide a new means that can be assembled without requiring piping work.

[0009]

According to the present invention, as a means for achieving the above object, one shaft end is provided.
A pipe-shaped case having an opening communicating with the secondary side and having an opening communicating with the secondary side on the other axial end side is provided on the inner peripheral surface of a body of a water supply device such as a stop valve connected to a water supply pipe. Formed into a shaft cylinder that fits through a seal member,
In the case, a valve seat located on the primary side, a cylindrical valve that moves in the axial direction opposite to the valve seat, and a cylindrical valve that is slidably penetrated through a shaft center portion. A sealing member for hermetically sealing the outer peripheral side of the cylinder to the primary side, a pressure-sensitive body integrally or integrally connected to the cylindrical valve, and moving in the axial direction by a pressure sensing operation on the secondary side, and the pressure-sensitive body And a spring for pushing out to the secondary side, the pressure reducing function section of the single-shaft type pressure reducing valve comprising the spring is stored and assembled in a cartridge shape to be incorporated in the body of a water supply device such as a stop valve. A pressure reducing valve is proposed.

[0010]

In the pressure reducing valve A for tap water according to the present invention configured as described above, the case 1 accommodating the pressure reducing mechanism v in the form of a cartridge has no connecting cylinder for connecting to the pipe B. Each case 1 is inserted into the body 90 of a water supply device such as a stop valve stv connected to the pipe B, and in that state, the body 90 of the water supply device such as the stop valve stv is inserted.
Is connected to the pipe B by connecting the connecting cylinder portion 91 to the pipe B, so that the pressure reducing valve A is connected to the pipe B
This eliminates the need for piping work for connecting the pressure reducing valve, and eliminates the need for a space for disposing the pressure reducing valve A.

[0011]

Next, an embodiment will be described in detail with reference to the drawings. In the drawings, the same reference numerals are used for components having the same effects as those of the conventional means.

FIG. 5 is a vertical sectional side view of a pressure reducing valve A for tap water in which the present invention is carried out. In the same figure, reference numeral 1 denotes a pipe-shaped case, v denotes a pressure reducing function part stored in the case 1, and 2 denotes a pressure reducing function. Pressure sensing element of the function part v, 3 is a cylindrical valve of the function part v, 4 is a valve seat of the function part v, 5 is a valve seat fitting of the function part v, 6 is a spring of the function part v, 8 Denotes a sealing material for the functional part v.

The case 1 is formed in a pipe shape from a metal material. An opening 1a communicating with the primary side w is opened at one shaft end side, and the opening 1a is formed at the other shaft end side with respect to the secondary side. The opening 1b for communicating with the opening is open.

The case 1 has an inner peripheral side, which is in contact with an outer end of the pressure sensing element 2 on the side facing the secondary side y, in the vicinity of the opening 1b communicating with the secondary side y. The step 1c to be formed is formed by bending the edge of the case 1 on the side of the opening 1b. A pressure-sensitive body sliding portion 1d that slides on the outer peripheral side of the pressure-sensitive body 2 is provided at a portion closer to the primary side w than the step portion 1c.
Are formed on the inner diameter corresponding to the outer diameter of the pressure-sensitive body 2. The outer end of the primary side of the sealing member 8 formed in a disk shape having a diameter larger than that of the pressure sensitive body 2 is brought into abutment with the end of the primary side w of the pressure sensitive body sliding portion 1d. The step portion 1 e is formed by expanding the diameter of the cylindrical wall of the case 1. In addition, this step 1
A portion 1f closer to the primary side w than e is formed with an inner diameter corresponding to the outer diameter of the sealing material 8 formed in a large-diameter disc shape,
The edge of the primary side w is formed in a form in which the portion 1f corresponding to the outer diameter of the sealing material 8 is extended before the pressure reducing function portion v is incorporated into the case 1.

The pressure-sensitive element 2 is formed in a ring shape having an outer diameter corresponding to the inner diameter of the pressure-sensitive element sliding portion 1d formed on the inner peripheral side of the case 1 and having a through hole 20 opened at the center. The base end of the cylindrical valve 3 is fitted into the through hole 20 at the center thereof, and is quickly connected integrally.

The cylindrical valve 3 is of a normal axial cylindrical shape in which the outer peripheral surface of the cylindrical wall is a side seal valve, and the base end is integrally formed with the through hole 20 at the center of the pressure sensing element 2 as described above. To the primary side w
The opening edge 30 on the front end side toward the front end is formed in a valve portion facing the valve seat 4. The tubular valve 3 may be formed of a metal material forming the pressure-sensitive body 2 so as to be integrally continuous with the pressure-sensitive body 2.

The sealing material 8 has an outer diameter of the step 1e of the case 1.
Is formed in a disk shape corresponding to the inner diameter of the portion 1f closer to the primary side w, and a through hole 80 which penetrates in the front and rear (axial direction) at the center portion slides on the cylindrical valve 3 described above. A spring seat for supporting one end of the spring 6 is formed on an end surface on the rear surface side (secondary side y).

The valve seat 4 is a normal sheet formed of a flexible material such as a synthetic resin material. The valve seat 4 is formed in a ring shape corresponding to the opening edge 30 on the front end side of the cylindrical valve 3 and is provided with a valve seat fitting. 5
It is attached to. The valve seat fitting 5 is formed in a disk shape having an outer diameter corresponding to the inner diameter of the portion 1 f defined by the primary side w of the case 1, and is located on the outer peripheral side of the valve seat 4 to be held. Are formed through the front and rear, and a ring-shaped support 51 protruding rearward is formed at the outer edge on the rear side facing the secondary side y.

Thus, the above-described pressure-sensitive body 2, the cylindrical valve 3 connected thereto, the spring 6 for pushing the pressure-sensitive body 2 to the secondary side y, the sealing material 8, and the valve seat metal fitting 5 for holding the valve seat 4 are provided. Are inserted into the case 1 from the opening 1a on the primary side w of the case 1 in that order.

Then, the outer end of the pressure sensing element 2 abuts the step 1c, the outer end of the secondary side y of the sealing material 8 abuts the step 1e, and the abutment 51 of the valve seat 5 is mounted. Primary side w of the sealing material 8
When it is in a state of abutting against the end face of the case 1, it is held in that state, and the edge of the opening 1a of the primary side w of the case 1 is bent and swaged to the end face of the primary side w of the valve seat fitting 5. Attachment 1
g, fixed in the state described above. Thereby, the pressure sensitive body 2
The change in the pressure on the secondary side y is controlled by the spring pressure of the spring 6 to move the cylindrical valve 3 integrally or integrally connected to the pressure-sensitive body 2 forward and backward with respect to the valve seat 4 to reduce the pressure to a predetermined pressure. An operating pressure reducing valve A is assembled.

The pressure reducing valve A thus assembled is
When connecting a water supply device such as a stop valve stv or a water meter M to the pipe B, a case in which a decompression function part v is incorporated inside the lumen of the body 90 of the water supply device as shown in FIG. Each one has an opening 1a on its primary side w,
An O-ring or the like previously installed on the inner peripheral surface of the body 90 is inserted between the outer peripheral surface of the case 1 and the inner peripheral surface of the body 90 between the outer peripheral surface of the case 1 and the inner peripheral surface of the body 90. A state in which the pressure reducing valve A is attached to the pipe B by connecting the pipe B to the connecting tubular portions 91 of the body 90 by interposing the seal members 92 and 92 to keep the water tight and airtight. I do.

At this time, through a communication hole 10 formed in the case 1, a portion of the body 90 is located in the middle of the seal members 92, which are previously assembled so as to be pressed against the outer peripheral surface of the case 1. An air hole 93 is provided for letting air that enters and exits from the outside of the body 90. Note that the body 90 is the body of the water appliance when the water appliance is, for example, a water meter M.

[0023]

As described above, the pressure reducing valve A for tap water according to the present invention is assembled into a cartridge by incorporating the pressure reducing function part v in the case 1, and the stop valve stv connected to the pipe B, etc. Case 1 in the body 90 of the water supply equipment
Because we are trying to assemble by fitting the whole,
The connection of the pressure reducing valve A to the pipe B can be omitted without the need for piping work for connecting the pressure reducing valve A to the pipe B.
Can be connected to the pipe B without exposing the outside to the outside, and without specially preparing a space for arrangement.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a pressure reducing valve for tap water by a conventional means.

FIG. 2 is a longitudinal sectional side view of a pressure reducing valve for tap water according to a preceding means.

FIG. 3 is a perspective view showing a state where the pressure reducing valve is connected to a pipe of a conventional means.

FIG. 4 is a vertical sectional side view of another connection mode of the same means to the piping of the pressure reducing valve.

FIG. 5 is a longitudinal sectional side view of a pressure reducing valve for tap water according to the means of the present invention.

FIG. 6 is a partially cutaway side view showing a state where the pressure reducing valve is connected to a pipe of the pressure reducing valve.

[Explanation of symbols]

A: pressure reducing valve for tap water, B: water supply pipe, C: water tap, D
... gap, M ... meter, a ... stop ring, b ... spacer, c ... annular groove, stv ... stop valve, v ... pressure reducing function part, w ... primary side, y ... secondary side, z ... spring chamber, 1 …
Case, 1a, 1b opening, 1c step, 1d pressure-sensitive body sliding part, 1e step, 1f part, 1g crimping,
DESCRIPTION OF SYMBOLS 10 ... Communication hole, 11 and 12 ... Connection cylinder part, 2 ... Pressure sensitive body, 2
0: through-hole, 3: cylindrical valve, 3a: cylindrical wall, 30: open edge,
4 ... valve seat, 5 ... valve seat fitting, 50 ... water passage, 51 ... abutment,
Reference numeral 6 denotes a spring, 7 denotes a watertight holding member, 8 denotes a sealing material, 80 denotes a through hole, 90 denotes a body, 91 denotes a connection tube portion, 92 denotes a sealing member, and 93 denotes an air hole.

Claims (2)

(57) [Claims] 1. A pipe-shaped case 1 having an opening 1a communicating with a primary side w on one shaft end side and an opening 1b communicating with a secondary side y on the other shaft end side is supplied with water. Piping B
Of water equipment such as stop valve stv to be connected to
A cylindrical shaft fitted to the inner peripheral surface of the cylinder 90 via a seal member 92
And a valve seat 4 located on the primary side in the case 1.
And a cylindrical valve 3 that moves in the axial direction opposite to the valve seat 4, and the cylindrical valve 3 is slidably penetrated through the center of the shaft so that the outer peripheral side of the cylindrical valve 3 is hermetically sealed to the primary side. A pressure-sensitive body 2 that is integrally or integrally connected to the cylindrical valve 3 and moves in the axial direction by a pressure sensing operation on the secondary side, and the pressure-sensitive body 2 is moved to the secondary side. A pressure reducing valve for tap water, wherein a pressure reducing function part v of a uniaxial pressure reducing valve comprising a spring 6 to be pushed out is stored and assembled in a cartridge shape to be incorporated in a body of a water supply device such as a stop valve stv. . 2. A case 1 is provided with a step portion for preventing the case 1 from coming into contact with an outer end on the secondary side of the pressure-sensitive body 2 at a position near the opening 1b communicating with the secondary side on the inner peripheral side thereof. 1c, and a pressure-sensitive body sliding portion 1d having an inner diameter corresponding to the outer diameter of the pressure-sensitive plate 2 is formed at a position closer to the primary side than the step portion 1c, and is formed on the primary side from the sliding portion 1d. A sealing material 8 larger in diameter than the pressure-sensitive plate 2
A step 1e which abuts with the outer end of the secondary side is formed, and the inside diameter of the portion 1f on the primary side from the step 1e is formed to the outside diameter of the sealing material 8, and the inside of the case 1 A pressure-sensitive plate 2 having a cylindrical valve 3 integrally or integrally connected to a shaft core portion from an opening 1a on the primary side thereof; a spring 6 for pushing the pressure-sensitive plate 2 to the secondary side; The sealing material 8 which fits air-tightly to the outer periphery of the cylindrical valve 3 by the through-hole 80 opened in the above, and the valve metal fitting 5 provided with the valve seat 4 facing the cylindrical valve 3 are inserted in this order. hand,
The pressure reducing valve for tap water according to claim 1, wherein the pressure reducing valve for tap water is assembled in the case 1 by caulking an edge portion of the opening 1 a on the primary side of the case 1.