JP2012057323A - Water supply control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent water conduction (water service opening) to a water meter without being authorized by a manager of water service in water supply piping and to eliminate the need of troublesome management of a stop valve performed in order to prevent unauthorized water conduction.SOLUTION: Before opening the water service, a check valve 4 is attached to the inflow port of the water meter 3 in the direction of stopping water flow to the water meter 3 from the inflow port. When opening the water service, the check valve 4 is taken out from the inflow port, the attaching direction is inverted so that the check valve 4 does not stop the water flow from the inflow port to the water meter 3, and then the check valve 4 is reattached to the outflow port of the water meter 3. Thus, without detaching and managing a handle 14 of a stop valve 1, the unauthorized water service opening is prevented, and the need of the attaching/detaching work of the handle or the like and troublesome management jobs is eliminated.

Description

  The present invention relates to a water supply control method for managing water supply to a water supply user, and more particularly, to a water supply control method using a check valve for preventing a backflow that occurs when water is shut off.

  Conventionally, purified tap water is sent from a distribution reservoir or the like to each region by a distribution pipe, and is further supplied to many water users by a water supply pipe branched from the distribution pipe.

  A water meter for measuring the amount of water used is connected to the water supply pipe. When installing a water meter, a water stop cock is usually installed upstream and a check valve is installed downstream. In this case, for example, as shown in FIG. 3B, the connecting pipe is connected from the upstream in the order of the handle ball stop cock 1, the water meter 3, and the packing integrated check valve 4.

  Here, the check valve is attached for the purpose of preventing water from flowing back into the water meter from downstream when the water is shut off, and for example, a check valve incorporated in the outlet of the water meter is disclosed. (See Patent Document 1)

By the way, when water supply work is performed in conjunction with the construction of a residential land or the construction of a new apartment, the water faucet is closed to prevent water from flowing into the water meter until the water user moves in and cannot be opened without permission. It is necessary to do so. This is because if the operation to start water supply to the water user (water tap opening) is performed without permission from the water administrator, it will be difficult to measure the appropriate amount of water usage, resulting in water management problems. is there.
For this reason, when the stop cock is closed, the manager of the water supply sometimes removes the operation handle from the stop cock and stores it. Further, in order to prevent the removed handle from being easily attached, as shown in FIG. 6, the attachment portion of the handle is also covered with a cover.

In this figure, a cap 9 is provided at the upper part of the water stop cock 8, and a protective cap 10 is screwed onto the upper part of the cap 9 to cover the plug bar 11.
And as an operation tool for opening and closing the water stopcock, the stopper rod presser 12, the handle shaft 13, and the handle 14 are integrated, and are stored in a separate place by the manager of the water supply except when they are operated.

  In addition, as a method for preventing opening (passing water) without permission, there is also disclosed a method of preparing two types of handles, a handle that can be opened and closed and a handle that can be closed only. (See Patent Document 2)

According to this, a handle that can only be plugged is handed over to water users and construction companies so that only water can be plugged (water-stopping) when water leaks or waterworks start. After completion, the water supply administrator will open (pass) water using a handle that can be opened.
This method is convenient for water users and construction contractors because it can be closed immediately when needed, and it is also beneficial for water managers because it does not open without permission. It is.

Japanese Patent Laid-Open No. 11-201785 JP 2007-255059 A

  However, when the operation handle is removed from the stop cock and stored, management work for the removed handle occurs, increasing the burden on the administrator.

  Further, in the water stopcock 8 shown in FIG. 6, every time an opening / closing operation is performed, the protective cap 10 must be removed, the handle shaft 13 inserted into the plug bar 11, and the plug bar presser 12 must be screwed into the cap 9. Not only is there inconvenience, but if the cap 9 or the protective cap 10 is broken, the opening / closing operation may be possible.

  In addition, when the installation location of the handle is closed with a cover, the cover must be attached and removed each time the stop cock is opened and closed, and the removed cover must be managed.

  An object of the present invention is to easily manage the water flow to a water meter and the water stoppage without removing the handle of the water stopcock and storing the same.

In order to solve the above-mentioned problem, the water supply control method of the present invention has a check valve on either the inlet side or the outlet side of the water meter until the water tap for starting water supply is opened. Attach the check valve to either the inlet side or the outlet side of the water meter when opening the water tap, so that the water flow from the inlet to the water meter is stopped. It was decided to change the direction of water flow from the water meter to the water meter.
According to this invention, it is not necessary to attach or detach the handle of the water faucet, and management work for the handle or the like is also unnecessary.

Further, in the water supply control method of the present invention, until the water tap for starting water supply is performed, a check valve is provided at the water meter inlet, and the flow of water from the inlet to the water meter is stopped. When attaching and opening the water tap, the check valve can be reattached to the outlet of the water meter in the direction in which water flows from the inlet to the water meter.
According to this invention, water flow to the water meter can be controlled more reliably.

Furthermore, the check valve can be a packing integrated check valve.
According to this invention, the check valve can be easily removed and reattached.

  As described above, the present invention can prevent a water tap from being opened without permission without performing troublesome management of the handle of the stop cock.

It is piping sectional drawing before opening in 1st Embodiment, (a) is a water meter upstream side, (b) is a figure of a water meter downstream. It is piping sectional drawing after the opening in 1st Embodiment, (a) is a water meter upstream side, (b) is a figure of a water meter downstream. It is a piping diagram in a 1st embodiment, (a) is a state before opening, (b) is a figure after opening. It is a piping diagram in a 2nd embodiment, (a) is a figure before opening, (b) is a figure after opening. It is a piping diagram in a 3rd embodiment, (a) is a figure before opening, (b) is a figure after opening. It is a piping diagram of the conventional water meter upstream.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the left side is drawn as the upstream side of the piping (the right side is the downstream side).
First, a first embodiment will be described with reference to FIGS.

  FIG. 1 is a cross-sectional view of piping near a water meter before opening in the first embodiment of the present invention, (a) is an upstream side of the water meter, and (b) is a downstream side of the water meter. .

In FIG. 1A, 3 is a water meter, and a male screw is machined on the outer surface of the tip of the inflow port 31. A female screw on the inner surface of the cap nut 5 is screwed into the male screw.
A flange 51 protrudes inward from the upstream end of the cap nut 5 and engages with a protrusion 21 provided at the downstream end of the telescopic socket 2 in the axial direction of the pipe.

  A packing part 41 of the check valve 4 is sandwiched between the downstream end of the telescopic socket 2 and the end of the inflow port 31. That is, when the cap nut 5 is tightened to the male screw of the inflow port 31, the flange 51 pulls the ridge 21 downstream and tightens the packing portion 41 between the telescopic socket 2 and the inflow port 31. Yes.

The check valve 4 is a so-called packing-integrated check valve, and is mainly used for a pipe connection portion of a water supply pipe. As shown in FIG. 1 (a), this packing-integrated check valve includes a cylindrical valve main body 45 including a coil spring, a valve body 42, a valve seat 43, and the like, and an annular packing portion 41 including an elastic material. Are integrally formed.
Fixing to the pipe is performed by clamping the annular packing portion 41 between the ends of both pipes. That is, the seal of the connecting portion of the piping and the check valve are fixed by tightening with the packing portion 41 sandwiched during piping.

  The check valve 4 before water tap opening is attached with the valve main body 45 on the upstream side and the packing portion 41 on the downstream side. The check valve is installed in a direction opposite to that normally used to prevent backflow.

  Here, the valve body 42 of the check valve 4 is urged to the downstream side by the elasticity of the coil spring, and the urging force and the water pressure act so that the outer surface of the top-shaped valve body 42 has a ring-shaped valve seat 43. To completely shut off the flow path.

The upstream end 22 of the telescopic socket 2 is inserted into the joint 15 on the stop cock 1 side. The telescopic socket 2 is fixed in a state in which the pushing allowance remains for a distance L until the tip 22 abuts against the reduced diameter portion 16 at the inner surface of the joint portion 15.
Thus, the connection structure between the expansion socket 2 and the joint portion 15 is an expansion joint structure.
Therefore, if the cap nut 5 is loosened and removed from the inlet 31, the telescopic socket 2 can be moved upstream by the length L in the joint portion 15.

In FIG.1 (b), the external thread of the front-end | tip of the outflow port 32 is processed into the external thread. A female screw provided on the inner surface of the cap nut 5 ′ is screwed into the male screw.
An inward flange 52 projects from the downstream end of the cap nut 5 ′ and engages with a protrusion 71 provided at the upstream end of the socket 7 in the tube axis direction.

Here, a ring-shaped packing 6 ′ is sandwiched between the tip of the outlet 32 and the protrusion 71, and when the cap nut 5 ′ is tightened to the male screw of the outlet 32, the flange 52 is protruded. The structure is such that 71 is drawn upstream and the packing 6 ′ is sandwiched between the socket 7 and the outlet 32 and tightened.
The above is the piping state before water tap opening.

Then, the operation content when performing water tap opening is demonstrated.
First, the water stopcock handle 14 is turned to stop water, the cap nut 5 is loosened and removed from the inlet 31, and the telescopic socket 2 is axially moved in the joint portion 15 toward the upstream side. At this time, the check valve 4 inserted on the downstream side of the telescopic socket 2 is extracted.

After extracting the check valve 4, instead of the check valve 4, a ring-shaped packing 6 is set at the tip of the inlet 31, the telescopic socket 2 is moved axially toward the downstream side, and returned to the inlet 31. The packing 6 is sandwiched between the ridges 21.
As it is, the cap nut 5 is fastened to the male screw of the inlet 31, the ridge 21 is pulled out by the flange 51, and the packing 6 is clamped between the ridge 21 and the inlet 31.

  Next, the cap nut 5 ′ is loosened and the cap nut 5 ′ is removed from the outlet 32. Accordingly, the packing 6 ′ and the socket 7 sandwiched between the outlet 32 and the protrusion 71 are also separated from the outlet 32.

The valve body 45 of the check valve 4 removed from the inlet 31 side is inserted into the upstream tip of the socket 7, and the cap nut 5 ′ is screwed into the outlet 32 with the packing portion 41 facing the upstream side, The annular packing portion 41 is clamped between the protrusion 71 and the outlet 32.
In this way, the check valve 4 at the time of opening is attached in such a direction that the valve main body 45 is on the downstream side and the packing part 41 is on the upstream side. The direction of the check valve is the same as that normally used for preventing backflow.

  When the replacement of the check valve 4 and the packing 6 is completed and the cap nuts 5 and 5 'are completely tightened, the handle 14 of the stop cock is turned to pass water, and the water tap is opened.

Then, the piping state after water tap opening is demonstrated.
FIG. 2 is a cross-sectional view of a pipe in the vicinity of a water meter after opening in the first embodiment of the present invention, where (a) is an upstream side of the water meter and (b) is a downstream side of the water meter. is there.

The cap nut 5 is screwed into the male screw of the inflow port 31, the hook 51 is hooked on the protrusion 21, and the expansion / contraction socket 2 is pulled downstream, and the packing between the downstream end of the expansion / contraction socket 2 and the end of the inflow port 31 6 is sandwiched.
Further, the cap nut 5 ′ is screwed into the male screw of the outlet 32, and the flange 52 is hooked on the protrusion 71 to pull the socket 7 upstream, and is located between the upstream tip of the socket 7 and the tip of the outlet 32. The packing part 41 is sandwiched.

The check valve 4 is fixed in a pipe with a packing portion 41 sandwiched toward the upstream side. A cylindrical portion extending downstream from the packing portion 41, that is, a valve body portion 45 including a coil spring, a valve body 42, a valve seat 43, etc., is inserted into the socket 7. ing.
Thus, the check valve 4 after water tap opening is attached in such a direction that the valve main body 45 is on the downstream side and the packing part 41 is on the upstream side. The direction of the check valve is the same as that normally used for preventing backflow.

Here, the valve body 42 of the check valve 4 is urged upstream by a coil spring, but since the action of the water pressure from the upstream is larger than this urging force, the valve body 42 is pushed and moved downstream. It is away from the seat 43. Water flows downstream from a gap formed by separating the valve body 42 from the valve seat 43.
When the water pressure on the downstream side becomes higher due to water breakage or the like, the valve body 42 is pushed and moved upstream by the water pressure from the downstream side and the bias of the coil spring, stops contacting the valve seat 43, and flows from the downstream side. Shut off (reverse flow).

  FIG. 3 is an overall view of a water supply pipe in the vicinity of a water meter in the first embodiment of the present invention, where (a) is a state before opening and (b) is after opening.

Next, a second embodiment will be described with reference to the drawings. In addition, about the member which is common with piping of the water supply pipe mentioned above, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
FIGS. 4A and 4B are overall views of a water meter pipe according to the second embodiment of the present invention. FIG. 4A is a view before opening, and FIG. 4B is a view after opening.

  Before the water tap is opened, the check valve 4 is fixed to the pipe by the packing part 41 being sandwiched between the inlet 31 and the telescopic socket 2 with the packing part 41 facing downstream. The check valve is installed in a direction opposite to that normally used to prevent backflow. Therefore, this check valve 4 prevents water from flowing into the water meter 3 from upstream.

  When performing water tap opening, after closing the stop cock 1 and stopping water, the check valve 4 is once taken out. Then, the check valve taken out is inverted so that the packing portion 41 faces the upstream side, and then attached to the same place. When the check valve has been reattached, turn the handle of the stop cock to pass water (open).

  After the water tap is opened, the check valve 4 is fixed to the pipe by directing the packing portion 41 toward the upstream side and sandwiching the packing portion 41 between the inlet 31 and the telescopic socket 2. The direction of the check valve is the same as that normally used for preventing backflow. Therefore, the check valve 4 allows water from upstream to pass but prevents backflow from downstream.

Subsequently, a third embodiment will be described with reference to the drawings. In addition, about the member which is common with piping of the water supply pipe mentioned above, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
FIGS. 5A and 5B are overall piping diagrams of a water meter according to a third embodiment of the present invention. FIG. 5A is a view before opening, and FIG. 5B is a view after opening.

  Before the water tap is opened, the check valve 4 is fixed by directing the packing portion 41 to the downstream side and sandwiching the packing portion 41 between the outlet 32 and the socket 7. The check valve is installed in a direction opposite to that normally used to prevent backflow. Therefore, the check valve 4 prevents water from flowing out from the water meter 3 downstream. As a result, water does not flow into the water meter 3 from upstream.

  When performing water tap opening, after closing the stop cock 1 and stopping water, the check valve 4 is once taken out. Then, the check valve taken out is inverted so that the packing portion 41 faces the upstream side, and then reattached to the original position. When reattachment of the check valve is completed, the handle 14 of the stop cock is turned to pass water (open).

  The check valve 4 after water tap opening is fixed to the pipe by directing the packing part 41 to the upstream side and sandwiching the packing part 41 between the outlet 32 and the socket 7. The direction of the check valve is the same as that normally used for preventing backflow. Therefore, the check valve 4 allows water flowing downstream from the water meter 3 to pass therethrough but prevents back flow from the downstream to the water meter 7.

1, 8 Handle type ball stop cock (stop cock)
2 Telescopic socket 3 Water meter 4 Packing integrated check valve (check valve)
5, 5 'Cap nut 6, 6' Packing 7 Socket 9 Cap 10 Protective cap 11 Plug bar 12 Plug bar presser 13 Handle shaft 14 Handle 15 Joint portion 16 Reduced diameter portion 21, 71 Projection 22 Tip 31 Inlet 32 Outlet 41 Packing part 42 Valve body 43 Valve seat 45 Valve body part 51, 52 鍔

Claims (3)

A water supply control method for managing water supply to water users,
Install a check valve on either the inlet or outlet side of the water meter to stop the flow of water from the inlet to the water meter until the tap is opened to start water supply. ,
When performing the water tap opening, the check valve is reattached to either the inlet side or the outlet side of the water meter so that water flows from the inlet to the water meter. Control method. A water supply control method for managing water supply to water users,
Install a check valve at the inlet of the water meter to stop the flow of water from the inlet to the water meter until the tap is opened to start water supply.
A water supply control method, wherein when the water tap is opened, the check valve is reattached to the outlet of the water meter so that water flows from the inlet to the water meter.   The water supply control method according to claim 1 or 2, wherein the check valve is a packing integrated check valve.

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