JP2007309412A - Water stop valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent water from remaining in a secondary side flow path of a water stop valve. <P>SOLUTION: In the water stop valve, a drain path 13 is provided passing from a flow path on the side of a flow-out port 6 beyond a water stop valve body 4 of the water stop valve 1 to the outside of the water stop valve body 2 for functionally draining water from the flow path on the side of the flow-out port 6 beyond the water stop valve body 4 via the drain path 13 to the pipe outside in a valve closed condition. The drain path 13 is drawn out of the lower part of the flow path on the side of the flow-out port 6 and guided to a drain port 11 provided in the lower part of the water stop valve body 2, and an openable/closeable drain valve 10 is provided in the drain port 11. The water stop valve body 4 is rotated with the rotating operation of a spindle 7 to open/close the flow path, and the drain valve 10 is rotated together with the water stop valve body 4 to open the drain port 11 in the valve closed condition of the flow path and to close the drain port 11 in the valve opened condition of the flow path. The drain path 13 is lower than the secondary side flow path to prevent water from remaining in the secondary side flow path of the water stop valve 1. The operation of the drain valve 10 is linked with the opening/closing operation of the water stop valve 1, and so the operation can be conveniently made unnecessary. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a stop cock used for water pipes and the like.

  Among the stopcocks provided in water supply pipes, etc., especially those used in cold regions, water that has accumulated on the secondary side in the closed state where the flow of water from the primary side to the secondary side is stopped In order to prevent freezing, there is a water drainage mechanism that drains the secondary side water out of the pipe.

  In general, a stop cock equipped with this type of drainage mechanism is installed in a meter box or the like, and is provided below the outflow side pipe line extending to the secondary side, and is mainly buried in the ground. Yes. For this reason, in the closed state of the stop cock, the water remaining in the stop cock is discharged outside the pipe by the water pressure on the secondary side.

For example, in the water stop valve described in Patent Document 1, in its open state, water flows from a primary side (inlet side) to a secondary side (outlet side) through a stop valve body that opens and closes the flow path. At the same time, the water on the secondary side also flows into a drainage drainage channel (bypass channel) that extends above the stop cock body due to the water pressure.
This drainage drainage channel leads to a drainage hole formed in the spindle for opening and closing operation that rotates integrally with the water stop valve body, and the drainage hole of the spindle is the amount of opening of the water stop valve body, that is, According to the rotation angle of the spindle, the drainage channel is switched between communication and non-communication, and the water stop valve body is in a non-communication state in a plugged state and in a closed state.
For this reason, when the stop cock is closed and the drainage drainage channel and the drainage hole of the spindle communicate with each other, the water on the secondary side is transferred from the drainage channel to the drainage hole by the water pressure on the secondary side. It flows in and is discharged out of the pipe from an outlet provided at the top of the spindle (see, for example, Patent Document 1).

Further, in the stop cock described in Patent Document 2, the drainage drainage channel extending from the secondary side leads to the drainage hole formed in the spindle above the stop valve body, and the drainage of the spindle A check valve is provided in the middle of the flow path leading from the hole to the drain opening that opens to the outside. (For example, refer to Patent Document 2).
Japanese Utility Model Publication No. 5-64579 Japanese Unexamined Patent Publication No. 2000-345591 (page 6, FIGS. 1 and 3)

  However, in the stop cocks described in Patent Documents 1 and 2, since the drain outlet for discharging the water on the secondary side to the outside of the pipe is in the upper part of the stop cock body, the secondary side flow of the stop cock There was a problem that all the water remaining on the road could not be discharged and the remaining water was frozen.

  Then, this invention makes it a subject to prevent water from remaining in the secondary side flow path of a water stop cock.

In order to solve the above-mentioned problems, the present invention draws out a drainage drainage channel extending from the secondary side flow path of the stop cock from the lower part of the secondary side flow path and leads it to the lower part of the stop cock body. The drain valve for opening and closing the drainage channel is provided at the lower part of the stop cock body.
If it does in this way, since the drainage channel is led to the lower part of the water stop valve body, it becomes lower than the secondary side channel. For this reason, it can prevent that water remains in the secondary side flow path of a water stop cock.

  In this invention, a drainage drainage channel extending from the secondary flow path of the stopcock is led to the lower part of the stopcock body, and a drain valve for opening and closing the drainage channel is provided at the lower part of the stopcock body. Therefore, it is possible to prevent water from remaining in the secondary-side flow path of the stop cock and to prevent freezing of water in the stop cock.

  As an embodiment of the present invention, a flow path connecting an inflow port and an outflow port is provided in the water stopcock body, and the flow path can be opened and closed by a water stop valve body. A drainage channel that leads from the flow channel to the outside of the water stop cock body is provided, and in the closed state of the flow channel, water in the flow channel on the outlet side of the water stop valve body is discharged outside the pipe through the drainage channel. In the stop cock having a function of allowing the drainage channel to be drawn out from the lower part of the flow path on the outlet side of the stop valve body and led to a drain outlet provided in the lower part of the stop cock body, A configuration with a drain valve that can be opened and closed at the mouth is adopted.

In this way, the flow path on the outlet side of the water stop valve body, that is, the water in the secondary flow path of the water stop cock can be drained out of the water stop cock after being closed. No water remains in the secondary channel. For this reason, freezing of the water in a pipe | tube can be prevented.
Moreover, since the drain outlet is provided in the lower part of the stop cock main body, the drainage channel and the discharged water do not interfere with the opening / closing operation of the stop cock. Further, since the water is drained below the stop cock, the stop cock main body is not wetted.

In the above configuration, the water stop valve body is rotated by a rotation operation of a spindle provided in the water stop cock body to open and close the flow path, and the drain valve rotates together with the water stop valve body and rotates. Accordingly, it is possible to employ a configuration in which the drain port is opened in the closed state of the flow path and the drain port is closed in the open state of the flow path.
In this way, the operation of the drain valve that opens and closes the drainage drainage channel is linked to the opening and closing operation of the stop cock, so that the operation of opening and closing the drain valve can be omitted, which is convenient.

Further, a check valve is provided in the flow path on the outlet side of the stop valve body, and the check valve is provided in a cylindrical socket inserted in a watertight manner in the outlet, and the drainage channel Is configured such that a flow path on the outlet side of the water stop valve body and the drain outlet are communicated with each other via a pool space provided between the cylindrical socket and the inner surface of the outlet. Can be adopted.
If it does in this way, it will become easy to provide the drainage channel for draining, and the number of parts of a water stop cock can be decreased.

  One embodiment will be described with reference to FIGS. This embodiment is a water stopcock 1 attached to a water pipe in a meter box or the like buried in the ground, and uses a rotary ball valve body as a water stop valve body 4 for opening and closing a flow path. is there.

  The structure of the stop cock 1 is that a flow path connecting the inlet 3 and the outlet 6 is provided in the stop cock main body (casing) 2 so as to pass through the inlet 3 and the primary side of the water pipe. The flow path is configured such that the secondary side flow path of the water pipe is connected to the outlet 6 via the check valve 20.

The water stop valve body 4 has a spherical shape as shown in FIGS. 1 and 4, and a spindle 7 rotatably supported by the water stop valve body 2 in a groove 4 c formed in the upper part of the water stop valve body 4. The lower end 7a is fitted. The upper end of the spindle 7 protrudes from the upper part of the stop cock body 2, and if the handle 8 attached to the upper end of the spindle 7 is manually operated to rotate the spindle 7 around the axis, the stop valve body 4 is also the same. It is designed to rotate in the same direction by the same angle.
Due to the rotation of the water stop valve body 4, the inner hole 4 a formed in the water stop valve body 4 and penetrating in the lateral direction changes its direction, and opens and closes the flow path connecting the inlet 3 and the outlet 6. 4 shows an opened state in which the direction of the middle hole 4a is the same as the direction of the flow path, and FIG. 1 shows a closed state in which the direction of the middle hole 4a is a direction perpendicular to the direction of the flow path. ing.

  Further, the stop valve 1 is provided with a check valve 20 in the secondary flow path located on the outlet 6 side of the stop valve body 4. The check valve 20 prevents the water that has passed through the water stop valve body 4 and supplied from the primary flow path to the secondary flow path from flowing back into the primary flow path again.

  The check valve 20 has a configuration in which a cylindrical socket 5 having a cylindrical insertion portion 5b is inserted into the outer periphery of the water stop cock 1 through a circular packing 5c, 5c that fits on the outer periphery thereof. It can be inserted in a watertight manner. The cylindrical socket 5 is movable in the cylinder axis direction with respect to the water stop valve body 2 while maintaining its watertight state. Further, the cylindrical socket 5 is fixed to the outlet 6 by screwing and tightening a nut 26 to the end (outer periphery) of the outlet 6 via a packing 5d or the like.

The valve body 21 of the check valve 20 can be brought into contact with and separated from the valve seat 24 of the valve hole 25 provided in the water passage portion 9 in the cylindrical socket 5. Further, the valve body 21 is urged in a direction to contact the valve seat 24 by the elastic force of the spring 22.
In the open state shown in FIG. 4, if water flows in the direction of arrow A, the valve body 21 is pushed rightward in the figure to leave the valve seat 24 and passes through the flow path 23 as shown by arrow B. Water is supplied to the secondary channel. In the closed state shown in FIG. 1, the valve element 21 abuts on the valve seat 24 by the biasing force of the spring 22 to close the valve hole 25.

A drainage channel 13 is provided from the secondary side channel located further to the end of the flow than the check valve 20 to the outside of the stop cock body 2.
The drainage channel 13 is drawn out from the secondary-side flow path via a pool space 13 b provided between the cylindrical socket 5 and the inner surface of the outlet 6, and a water stop valve body at the lower part of the water stopcock body 2. 4 is led to a drain port 11 provided immediately below. The drain port 11 opens to the outside of the water stop valve body 2.
The reservoir space 13b is formed in a portion sandwiched between the packings 5c and 5c by forming a recess 5a on the entire outer periphery of the cylindrical socket 5 so that the entire periphery of the reservoir space 13b is formed between the inner periphery of the outlet 6 and the outer space. Continuously.
The water passing portion 9 in the cylindrical socket 5 and the pool space 13b communicate with each other through an inner and outer through hole 13a formed in the cylindrical socket 5, and the pool space 13b is The drainage port 11 is reached through a drainage hole 13c provided on the water stop valve body 2 side. Since the pool space 13b is provided over the entire circumference, it is necessary to adjust the direction (circumferential position) of the cylindrical socket 5 with respect to the outlet 6 when the position of the drain hole 13c and the pool space 13b are communicated. There is no.

  A drain valve 10 is provided at a drain port 11 provided immediately below the water stop valve body 4 so that the drain channel 13 can be switched between open and closed outside the stop cock body 2. .

  The valve body 12 of the drain valve 10 has a circular cross section, and the outer peripheral portion 12b slides in a watertight manner on the inner periphery of the drain port 11 that also has a circular cross section through a packing 14a. Further, the valve body 12 is supported so that the shaft part protruding upward fits into a hole 2a formed in the lower part of the water faucet body 2 via the packing 14b so as to be rotatable about the axis. An upper end 12 e of the shaft portion extends into the water stop cock body 2 and is fitted into a groove 4 b formed in the lower part of the water stop valve body 4. For this reason, the valve body 12 of the drain valve 10 rotates in the same direction by the same angle as the water stop valve body 4 rotates.

  Further, the valve body 12 is provided with a screw shaft 12c protruding downward, and the screw shaft 12c is attached to the lower part of the stop cock body 2 so as to cover the drainage port 11 via a screw 16. A nut 12d is screwed into the lower end of the cover 15 that passes through the cover. If the nut 12d is fastened to the screw shaft 12c with a strength that does not hinder the rotation of the valve body 12, the cover 15 and the valve body 12 are supported in a relatively rotatable state.

In addition, the valve body 12 of the drain valve 10 is formed with a discharge hole 12a, and the cover 15 is also formed with a discharge hole 15a having an inner diameter similar to that of the discharge hole 12a. In this embodiment, the discharge hole 15a has a slightly larger diameter than the discharge hole 12a.
If the valve main body 12 of the drain valve 10 rotates with rotation of the water stop valve body 4, the discharge hole 12a will move along the rotation direction. If the positions of both the discharge holes 12a and 15a coincide with each other by this movement, the drain port 11 is opened to the outside (see FIG. 2), and if the positions are different, the drain port 11 is closed (see FIG. 5).

  With the above configuration, as shown in FIG. 4, the drain valve 10 closes the drain port 11 in the state where the water stop valve body 4 opens the flow path, and the water stop valve body as shown in FIG. 1. Since the drain valve 10 opens the drain port 11 in a state where the channel 4 is closed, the drain valve 10 stays in the channel further on the end side than the check valve 20 via the drain channel 13 in the closed state. Water can be discharged out of the pipe as indicated by arrows C and D shown in FIG.

An example is shown, and the drain valve is opened in the closed state. 1 is a partially cut perspective view showing the drain valve of FIG. Bottom view showing the cover of FIG. The same Example is shown, and the drain valve is closed in the open state. FIG. 4 is a partially cut perspective view showing the drain valve of FIG. Bottom view showing the cover of FIG. Enlarged perspective view of the main part of the cylindrical socket

Explanation of symbols

1 Faucet 2 Faucet body (casing)
DESCRIPTION OF SYMBOLS 3 Inflow port 4 Water stop valve body 5 Cylindrical socket 6 Outlet port 7 Spindle 8 Handle 9 Water flow part 10 Drain valve 11 Drain port 12 Valve body 12a, 15a Drain hole 13 Drain passage 13a Through-hole 13b Reservation space 13c Drain hole 15 Cover 20 Check valve 21 Valve body 22 Spring 25 Valve hole

Claims (3)

A flow path connecting the inlet 3 and the outlet 6 is provided in the water stopcock body 2 so that the flow path can be opened and closed by the water stop valve body 4. A drainage channel 13 that leads from the channel to the outside of the stop cock body 2 is provided, and in the plugged state of the channel, water in the channel on the outlet 6 side from the stop valve body 4 is passed through the drainage channel 13. In a stop cock with the function of discharging outside the pipe,
The drainage channel 13 is drawn from the lower part of the flow path on the outlet 6 side of the stop valve body 4 and led to the drain port 11 provided at the lower part of the stop cock body 2, and can be opened and closed freely. The water stop valve characterized by providing the drain valve 10 of the above.   The water stop valve body 4 is rotated by a rotation operation of a spindle 7 provided in the water stop cock body 2 to open and close the flow path, and the drain valve 10 is rotated together with the water stop valve body 4, The water stop valve according to claim 1, wherein the drainage port 11 is opened in a closed state of the flow path by rotation and the drainage port 11 is closed in a closed state of the flow path.   A check valve 20 is provided in the flow path on the outlet 6 side of the water stop valve body 4, and the check valve 20 is provided in a cylindrical socket 5 inserted in the outlet 6 in a watertight manner. The drainage channel 13 is connected to the flow path on the outlet 6 side of the water stop valve body 4 through the pool space 13b provided between the cylindrical socket 5 and the inner surface of the outlet 6. The water stop valve according to claim 1 or 2, wherein the water discharge port (11) is formed in communication with the water discharge port (11).

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