JP3786504B2 - Check valve with drainage mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a check valve provided with an integrated drainage mechanism, and more specifically, a check valve provided with an integrated drainage mechanism capable of draining not only the downstream side of the check valve but also the upstream side. Regarding the valve.
[0002]
[Prior art]
In cold regions, drain plugs are used to prevent water from freezing in winter. For example, as shown in FIG. 1, a stop cock 3, a pressure reducing valve 5, a meter 7, and a check valve 9 are installed in a water distribution pipe 1 drawn from a main pipe, and a faucet 11 or the like is attached to the tip of a rising pipe 10. However, in this case, a drain plug 13 is installed on the downstream side of the check valve 9 and is operated before going to bed at night to drain water in the rising pipe 10 to prevent freezing.
[0003]
By the way, in an area where the cold is extremely severe and the depth of freezing is deep, the water remaining in the meter 7 and the like installed at 4, 50 cm underground is frozen. The drain plug currently used is for draining the water in the downstream portion. In the case of FIG. 1, the drain plug 13 cannot drain the water in the upstream meter 7 or the like. It is conceivable to install these meters 7 etc. deeply, but at a very deep freezing depth, deeper than this freezing depth (some areas are defined as 2 meters). It is extremely inconvenient in the work such as meter reading.
[0004]
Therefore, as shown by a dotted line in FIG. 1, a drain plug 14 may be installed at a position deeper than the freezing depth on the upstream side of the stop cock 3. In this case, if the check valve 9 is in the position shown in FIG. Therefore, there is a drain plug 14 with a check valve attached thereto, but it is provided in a narrow space, and there is a disadvantage such as a large head loss. Further, it is not preferable that the downstream sewage flows into the meter 7 or the like due to the reverse flow generated during the pressure reduction on the upstream side, and it is preferable that the check valve 9 is installed on the downstream side.
[0005]
Also, in apartment houses and the like, a space called a pipe shaft is provided for each house, and various devices such as gas pipes, water pipes and meters are installed therein. Such a pipe shaft cannot be provided with a drain plug of the type installed in the ground as indicated by reference numeral 13 or 14 in FIG. 1, for example, a drain valve 15 as shown in FIG. It may be installed instead of the drain plug 13 of FIG. Reference numeral 16 is an inlet, 17 is an outlet, and 18 is a drain, and the handle 19 is operated to move the spindle 20 up and down to switch between water flow and water drainage. However, as is clear in this case, water cannot be drained upstream of the drain valve 15. The pipe shaft is prohibited from being sealed by the Fire Service Act, and the entire pipe shaft cannot be kept warm, and water freezes inside the meter or the like at low temperatures. In addition, since the pipe shaft is extremely narrow, there is a limit to the number of devices to be installed.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and is provided with an integrated drainage mechanism in the check valve, and by allowing not only the downstream side but also the upstream side drainage, When using it in a general house, installation in a deep position is not necessary, and even when using it in a pipe shaft of a collective house, water is also drained from the meter etc. to completely prevent freezing, together with installation space This is also an attempt to solve the problem of improvement of work efficiency.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the following means are employed in the present invention. That is, a main body having a through-flow passage for allowing water to flow from the upstream side to the downstream side therein, a valve seat provided in the middle of the through-flow passage of the main body, and a biasing means toward the valve seat And a check valve body that allows the flow from the upstream side to the downstream side of the through-flow passage and prevents the flow from the downstream side to the upstream side. And a first opening communicating with the through-flow passage of the main body on the upstream side of the valve seat, a second opening communicating with the through-flow passage on the downstream side of the valve seat, and a drain port. A valve chamber is provided, and switching valve means disposed in the valve chamber is disposed. The switching valve means is configured to simultaneously switch the communication between the first opening and the second opening and the blocking of the drain outlet.
[0008]
In a specific embodiment, the switching valve means includes a first flow path capable of directly communicating one of the first opening and the second opening and the drain outlet, and the first flow path. A second flow path is provided that allows the other opening of the first opening and the second opening to communicate with the first flow path.
[0009]
More specifically, the switching valve means is rotatably held in the valve chamber by sealing sheets respectively disposed around one of the first and second openings and the drain port. A ball valve body, a through hole communicating with the one opening and the drain port when the valve body is rotated to a predetermined position, and an outer surface of the valve body. A lateral hole communicating with the through hole is formed. The through-hole can directly connect the first opening and the drain port.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 3 is a cross-sectional view of the check valve 21 with a drainage mechanism according to a specific embodiment of the present invention in a water passage state, and FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. Water flows in the direction of the arrow in FIG.
[0011]
Reference numeral 23 denotes a main body, which is provided with a through-flow passage 25 for flowing water from the upstream side (left side in FIG. 3) to the downstream side. A known check valve 27 for a check valve is disposed in the flow path 25.
[0012]
That is, the check cartridge 27 includes a saddle type valve body 29 biased by a spring 31 and a non-closed frame body 33. The frame 33 includes a base 35 having a shaft 37 for guiding the valve body 29, a plurality of lateral ribs 41 extending radially outward from the base and connected to the base annular part 39, and a base annular part. 39 and a plurality of vertical ribs 45 extending in the same direction as the shaft 41 and coupled to the valve seat ring part 43. A valve seat member 47 made of an elastic material such as rubber and formed integrally with the metal ring 49 is attached to the valve seat ring portion 43. When the water flow stops, the valve body 29 comes into contact with the valve seat 51 formed on the inner peripheral side of the valve seat member 47 by the urging force of the spring 31 to prevent the backflow of water. The check cartridge 27 is a cartridge in which the front surface of the valve seat member 47 abuts on the surface of the inner flange 26 formed inside the main body 23 and the rear surface of the base annular portion 39 is attached to the main body 23 by screw connection. In a state of being pressed by the presser 53, it is fixedly disposed in the main body 23.
[0013]
Reference numeral 61 denotes a drainage valve chamber formed on the side of the main body 23, and communicates with the flow path 25 through an opening 63 formed in the main body on the upstream side of the valve seat 51. A ball valve element 65 is disposed in the valve chamber 61 and is prevented from coming off by a ball press 73 having a discharge port 71. That is, the ball valve element 65 is maintained in a sealed state between the ring-shaped sheets 75 and 77 made of an elastic material, which are respectively disposed around the opening 63 and the drain port 71 in the valve chamber 61. It is pinched by. The ball valve body 65 includes a through-hole 67 that penetrates in the diameter direction, and an outer periphery of the ball valve body 65 in a direction perpendicular to the through-hole 67 (in FIG. 3, from the front side of the paper surface to the vertical direction of the paper surface) A lateral hole 69 that extends from the through channel 67 to the through channel 67 is formed.
[0014]
As shown in FIG. 3, a spindle 85 is attached to the ball valve body 65 on the opposite side of the lateral hole 69 in the diametrical direction. The spindle 85 extends out of the main body 23 and is operated from the outside. Thus, the ball valve body 65 can be rotated around an axis perpendicular to the paper surface in FIG. Reference numeral 87 denotes an O-ring for sealing, and reference numeral 89 denotes a spindle press attached to the main body 23 by screw connection.
[0015]
In FIG. 3, reference numeral 79 denotes one end of which communicates with the flow path 25 through an opening 81 formed in the main body 23 on the downstream side of the valve seat 51, and the other end of the opening 83 formed in the side wall of the valve chamber 51. This is a bypass flow path communicating with the valve chamber 51 via the. Reference numeral 93 denotes a plug that closes an air intake hole 91 described later.
[0016]
The check valve 21 with a drainage mechanism having the above-described configuration is installed instead of the check valve 9 in FIG. 1, for example. In this case, the drain plug 13 is unnecessary, and of course, it is not necessary to provide the drain plug 15 as well.
[0017]
3 and 4 show a water flow state, for example, a state where the faucet 11 of FIG. 1 is opened. At this time, the valve element 29 of the check cartridge 27 overcomes the force of the spring 31 by the water pressure, leaves the valve seat 51, and water flows from the upstream side to the downstream side. The ball valve body 65 prevents water from flowing into the valve chamber 61 from the opening 63 formed in the main body 23 on the upstream side of the valve seat 51. Further, the water flowing into the valve chamber 61 from the opening 81 formed in the main body 23 on the downstream side of the valve seat 51 through the bypass flow path 79 and the opening 83 is closed in the opening of the seat 77 by the ball valve body 65. Therefore, it does not flow to the drain port 71.
[0018]
When the faucet 11 is closed and the water flow is stopped, the valve body 29 of the check cartridge 27 is seated on the valve seat 51 to prevent the water from flowing back downstream. Back flow through the bypass channel 79 is also prevented by the ball valve body 65.
[0019]
FIG. 5 is a sectional view showing a drained state, and FIG. 6 is a sectional view taken along line 6-6 of FIG. As is apparent from the figure, this state is a state in which the ball valve body 65 is rotated 90 degrees clockwise around an axis perpendicular to the paper surface using the spindle 85 from the state of FIG.
[0020]
Prior to this draining state, the water stop cock 3 shown in FIG. And the faucet 11 is opened. However, for example, when an intake valve is attached to the riser 10, it is not necessary to open the faucet 11. In this state, the ball valve body 65 is rotated using the spindle 85 as described above. At this time, the plug 93 is loosened and the air intake hole 91 is opened. If a vertical groove is formed in the threaded portion of the plug 93, it is not necessary to completely remove the plug.
[0021]
In this state, the water in the pipe upstream from the check valve 21, the stop cock 3, the pressure reducing valve 5, the meter 7, etc. passes from the flow path 25 to the through hole 67 of the ball valve body 65 through the opening 63. It flows in and drains from the drain port 71. On the other hand, the water downstream from the check valve 21 enters the empty space around the ball valve body 65 in the valve chamber 61 through the bypass flow path 79 from the opening 81 and passes through the lateral hole 69 of the ball valve body 65. Then, it flows into the through hole 67 and is drained from the drain port 71. In that case, air flows in from the air intake port 91 and can be easily drained. In this way, not only the riser portion but also various devices installed on the upstream side can be drained, which is very convenient. Instead of the plug 93 attached to the air intake port 91, it is possible to use a float that floats on water.
[0022]
In the above-described embodiment, the through hole 67 of the ball valve body 65 directly communicates the opening 63 communicating with the upstream side of the flow path 25 and the drain port 71 in the drained state. However, by changing the arrangement of the openings 63 and 83 and the drain port 71, it is possible to adopt a configuration in which the opening 83 communicating with the downstream side is directly communicated with the drain port 71.
[0023]
【The invention's effect】
As is clear from the above description, if the check valve with a drainage mechanism according to the present invention is used, not only the drainage on the downstream side, but also various devices on the upstream side that could not be achieved with conventional drainage plugs. The water inside can also be drained, and freezing in these devices, which has been a problem in the past, can be reliably prevented. In addition, as described with reference to FIG. 1, it is not necessary to install a drain plug at a deep position, and inconvenience when a check valve is formed integrally therewith can be avoided. In particular, a check valve can be installed on the downstream side of a meter or the like as in the past, so that backflow water can be prevented from flowing into the meter or the like, and contamination of the meter or the like due to the backflow of upstream sewage can be prevented.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an arrangement example of a check valve, a drain plug, and the like.
FIG. 2 is a cross-sectional view showing an example of a drain valve used in a conventional pipe shaft.
FIG. 3 is a cross-sectional view showing a water flow state of a check valve with a drainage mechanism according to an embodiment of the present application.
4 is a cross-sectional view taken along line 4-4 of FIG.
FIG. 5 is a cross-sectional view showing a drained state.
6 is a cross-sectional view taken along line 6-6 of FIG.
[Explanation of symbols]
21 Check valve 23 with drainage mechanism Main body 25 Through passage 29 Valve body 51 Valve seat 61 Valve chamber 63 Opening 65 Ball valve body 67 Through hole 69 Side hole 71 Drain port 75, 77 Seat 79 Bypass passage 81, 83 Opening

Claims (4)

A main body having a through-flow passage for flowing water from the upstream side to the downstream side inside, a valve seat provided in the middle of the through-flow passage of the main body, and biased toward the valve seat by a biasing means And a check valve body that allows a flow from the upstream side to the downstream side of the through-flow passage and prevents a flow from the downstream side to the upstream side, and the penetration of the main body upstream of the valve seat. A first opening communicating with the flow path, a second opening communicating with the through flow path on the downstream side of the valve seat, a valve chamber having a drain port, and a switching valve means disposed in the valve chamber The drain valve mechanism is characterized in that the switching valve means is configured to simultaneously switch between the first opening and the second opening and communication with the drain outlet. With check valve. 2. The check valve with a drainage mechanism according to claim 1, wherein the switching valve means is capable of directly communicating one of the first opening and the second opening with the drain port. A second flow path capable of communicating the flow path and the other opening of the first opening and the second opening in the middle of the first flow path is provided. A check valve with a drainage mechanism. 3. The check valve with a drainage mechanism according to claim 2, wherein the switching valve means is disposed in the valve chamber around either one of the first and second openings and the drain port. A ball valve body rotatably held by a seat, and a through-hole communicating with the one opening and the drain port when the valve body is rotated to a predetermined position inside the valve body A check valve with a water draining mechanism is characterized in that a lateral hole that leads from the outer surface of the valve body to the through hole is formed. The check valve with a drainage mechanism according to claim 3, wherein the one opening is the first opening.

Images