JP4224600B2 - Underground decompression stop cock - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an underground buried type pressure reducing stopcock in which a function as a pressure reducing valve is incorporated in a stop cock mainly installed before a meter of a water supply pipe in the ground.
[0002]
[Prior art]
Conventionally, in high-pressure areas, it has been common to use pressure reducing valves for the purpose of water economy, vibration due to water hammer effects, prevention of damage to piping equipment, etc. Since it does not have a water device, a water stop cock is installed separately on the upstream side of the pressure reducing valve, or the water stop device is coaxially located above the pressure reducing piston as in Japanese Utility Model Publication No. 8-7456 by the same applicant. There has been a method of adopting the one made above.
[0003]
However, in the former case, there is a problem that the cost is high, the installation length is long, and it cannot be accommodated in the conventional meter box. When a pressure reducing valve breaks down, it is necessary to search for a stop valve on the upstream side, which makes it difficult to repair and replace the pressure reducing valve, and because of its structure, it is difficult to install a strainer. After all, there was a defect that easily caused an accident.
[0004]
[Problems to be solved by the invention]
In view of the above points, in the present invention, the pressure reducing valve can be repaired, the strainer can be easily installed and inspected, and the function as the pressure reducing valve can be maintained for a long time. The purpose is to provide.
[0005]
[Means for Solving the Problems]
Therefore, in the present invention, a water stop device that reliably stops water by rotating a screw with a water stop with an upward facing water stop valve seat on the upstream side of the valve box and a piece packing at the lower end, and its downstream valve A decompression unit body that is connected to the box in parallel as close as possible to the waterstop, and that has a cylindrical strainer attached to the outer periphery, and is housed therein and formed under the decompression spring and the decompression unit body It is basically composed of a decompression piston that moves up and down by the secondary pressure in the secondary chamber, so that sewage does not enter the air chamber formed above the decompression piston, but rises in the air chamber An O-ring is attached as a check valve to a plug connected to the upper end of the air chamber so that the pressure is released to the outside.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0007]
FIG. 1 shows an embodiment of the present invention. In the valve box 1, an upward water stop valve seat 3 is provided downstream of the inflow port 2, a primary chamber 4 is provided above it, and a guide is provided below and downstream thereof. The secondary chamber 6 surrounded by the wall 5 is further provided on the downstream side with an outlet 7 on the same axis as the inlet 2. A gland 8 is connected and fixed to the upper end portion of the same axial center as the water stop valve seat 3 of the valve box 1, and a decompression section main body 9 is screwed to the upper end portion of the same axial center as the guide wall 5.
[0008]
The gland 8 has an internal working screw 10, and a waterstop 12 having an internal working screw 11 that is screwed to the gland 8 rotates up and down, and a piece packing 13 attached to the lower end closely contacts the waterstop valve seat 3. , To leave, and stop water and water.
[0009]
The decompression section main body 9 has a cylindrical strainer 14 attached to the outer peripheral portion so as not to be easily detached by the frictional force of the strainer packing 15, and a plurality of water passage holes 16 are formed at corresponding positions on the side. The cylinder 17 is provided above, and a downward pressure reducing valve seat 18 having the same diameter as the cylinder 17 is formed below.
[0010]
Reference numeral 19 denotes a pressure reducing piston. An annular packing 20 that is in close contact with the cylinder 17 is attached to the upper end portion, and a taper-like pressure reducing packing 21 that is in close contact with and released from the pressure reducing valve seat 18 is attached to the lower end portion of the guide wall 5. The valve piece 22 is attached so as not to be detached. Further, a spring chamber 23 is provided by piercing the inner upper end portion, and an air chamber 25 surrounded by a screw 24 is formed above the spring chamber 23.
[0011]
A plug 26 is connected to the upper end of the screw 24, and an adjustment ring 27 is screwed below it. Reference numeral 28 denotes a pressure reducing spring which is mainly accommodated in the spring chamber 23 and is locked to the adjustment ring 27 to apply a downward pressing force to the pressure reducing piston 19.
[0012]
A taper portion 30 is formed at the lower end of the flange portion 29 of the plug 26 and a parallel portion 31 is formed thereunder. The O-ring 32 is not constrained between the outer diameter and the upper end portion, and a certain gap is provided. The part 30 and the parallel part 31 are attached so as to be in close contact with the flat part 33 of the decompression part main body 9.
[0013]
FIG. 1 shows a state in which the faucet at the end of the pipe is slightly opened and water is flowing, and the high-pressure primary water that has passed through the primary chamber 4 from the inlet 2 passes through the strainer 14 and the water passage hole 16. It passes through the gap between the pressure reducing valve seat 18 and the pressure reducing packing 21 and flows into the secondary chamber 6 as low-pressure secondary water and flows out of the faucet. The secondary pressure decreases and is pressed by the pressure-reducing spring 28, so that the pressure-reducing piston 19 is lowered and the flow rate is further increased. When the faucet is closed, the secondary pressure becomes maximum, the pressure reducing spring 28 is pressed, the pressure reducing piston 19 rises to the maximum, and the pressure reducing packing 21 is pressed by the pressure reducing valve seat 18 to block the primary water in the primary chamber 4. The pressure reducing spring 28 may be adjusted in advance so that the secondary pressure at that time becomes the set pressure. When the adjustment ring 27 is lowered, the set pressure increases, and when the adjustment ring 27 is raised, the set pressure decreases. However, the adjustment ring 27 can be omitted by inserting a pressure adjustment plate having a constant thickness. At this time, one end of the pressure reducing spring 28 is locked to the plug 26. In the present invention, since the spring chamber 23 is formed by piercing the upper end portion of the pressure-reducing piston 19, the pressure-reducing portion main body 9 can be made shorter and more compact. However, when the adjustment ring 27 is omitted, the plug 27 The spring chamber 23 can also be formed by drilling.
[0014]
If the cylinder 17 and the pressure reducing valve seat 18 are formed to have the same diameter, even if the primary pressure fluctuates, the fluctuation of the secondary pressure can be kept small. When the decompression piston 19 moves up and down, the annular packing 20 portion is restrained by the cylinder 17 and the valve piece 22 is restrained by the guide wall 5, so that it operates stably. Since the decompression packing 21 is formed in a taper shape along the stream line, there is no sudden change of the flow path, so there is little loss resistance and a larger flow rate can be expected.
[0015]
In the event that water enters the air chamber 25, the pressure in the air chamber 25 increases, but as a result, the secondary pressure also increases and the function as a normal pressure reducing valve is lost. End up. However, in the present invention, since the O-ring 32 that is not restrained outward and upward is attached to the plug 26, the O-ring 32 is overcome outwardly by expanding the rubber elasticity, and the pressure is released. It becomes possible to prevent an increase in the next pressure. If the pressure in the air chamber 25 decreases, the O-ring 32 contracts due to rubber elasticity. At this time, the O-ring 32 is not displaced upward by the taper portion 30 and is closely attached to the flat portion 33. Therefore, underground sewage does not enter the air chamber 25. That is, the O-ring 32 functions as a kind of check valve.
[0016]
The pressure reducing valve seat 18 is a cylinder having the same diameter as that of the cylinder 17, and an annular packing 20 is used as the pressure reducing packing 21. The pressure reducing valve seat 18 can be separated from the cylinder downward to allow water to pass therethrough. It is simple, easy to assemble and disassemble, and can reduce costs. At this time, the guide wall 5 may be omitted.
[0017]
When the strainer 14 is clogged, the packing of the decompression piston 19 is in an accident, etc., when the water stop 12 is rotated, the operating male screw that engages with the operating female screw 10 formed in the gland 8 11, the waterstop 12 is lowered while rotating, and the piece packing 13 is in close contact with the waterstop valve seat 3 to block the water from the inlet 2. Thereafter, the decompression section main body 9 is removed from the valve box 1. Repair and inspection may be performed. Since the piece packing 13 is pressed against the water stop valve seat 3, water stop is also performed reliably. Further, the strainer 14 is not easily detached due to the frictional force of the strainer packing 15, but can be easily removed by applying a force.
[0018]
【The invention's effect】
As described above, in the present invention, the water stop valve seat is pressed against the water stop valve seat by the rotation of the screw, and the water stop rod is securely stopped, and the cylindrical strainer is attached to the outer peripheral portion. Since the pressure reducing unit body, which can be easily detached, is placed in parallel as close as possible, the mounting span can be shortened, and the pressure reducing valve and strainer can be easily inspected and repaired. Since it is possible to effectively prevent water from entering the air chamber and increasing the secondary pressure, the function as a pressure reducing valve can be maintained for a long time.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view in a water passage state showing an embodiment of the present invention.
[Explanation of symbols]
1 Valve box 2 Inlet 3 Water stop valve seat 4 Primary chamber 6 Secondary chamber 7 Outlet
8 Gland 9 Decompression unit body 11 Male screw 12 for operation 12 Water stop 13 Block packing 14 Strainer
15 Strainer packing 16 Water passage hole 17 Cylinder 18 Pressure reducing valve seat 19 Pressure reducing piston 20 Annular packing 21 Pressure reducing packing 23 Spring chamber 25 Air chamber 26 Plug 28 Pressure reducing spring
29 parts
30 taper section
31 parallel part 32 O-ring
33 flat part

Claims (2)

Via the upward water stop valve seat (3) , the primary chamber (4) is located upstream and downstream of the inflow port (2) , the secondary chamber (6) is located downstream of the primary chamber (4) , and further downstream thereof. A valve box (1) having an outlet (7) on the same axis as the inlet (2) on the side, and a piece packing (13) for closing the water stop valve seat (3) at the lower end are mounted. box (1) and the water stop rod (12) which rotates vertically moved by actuating external thread the connected in the ground (8) to the upper portion (11), a cylindrical stress on the outer peripheral portion - Na (14) stress - Napakkin easily by friction (15) mounted so as not to leave, bored a plurality of water passing holes at corresponding positions of the lateral (16), inside, the water passage hole (16) the cylinder (17) above the, downward earned cylinder (17) and the diameter of the downward pressure reducing valve seat (18), and parallel to Tomesui桿(12) in, Rudake proximity to the valve box (1) connected to vacuum body to the upper end (9), in close contact with the annular packing (20) and the pressure reducing valve seat that slides the cylinder (17) (18), disengaged The pressure reducing piston (19) to which the taper- shaped pressure reducing packing (21) is attached and the air pressure chamber (25) formed at the upper end of the pressure reducing piston (19) are accommodated in the downward direction to the pressure reducing piston (19) . An underground buried pressure reducing stopcock comprising a pressure reducing spring (28) that gives a pressing force of. A plug (26) in which a taper portion (30) having a lower width is formed at the lower end of the flange portion (29) and a parallel portion (31) is connected to the upper end portion of the pressure reducing portion main body (9), and The plug (26) has an O-ring (32) in close contact with the flat portion (33) of the taper portion (30), the parallel portion (31), and the decompression portion main body (9), and the O-ring (32 The outer diameter and the upper end of () are not restricted, and are installed with a fixed gap to prevent the entry of sewage from the outside and to release the rising pressure in the air chamber (25) outward. Underground decompression stop cock as described.

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