Hot and cold water drain valve for foundation installation

Abstract

To provide a water / hot-water drain valve that improves workability, enables an increase in a degree of freedom of underfloor piping, and takes into consideration workability in maintenance and inspection after installation, in an installation environment where an installation space is limited.SOLUTION: A water / hot-water drain valve according to the present invention comprises a valve box installed such that a length direction of the valve box is horizontal. A piston that is linearly movable in the length direction is housed inside the valve box. A water side joint and a hot-water side joint are arranged around an outer periphery of the valve box. The hot-water drain valve further comprises an operation part that moves the piston. The water side joint comprises: an inflow joint through which water flows from upstream water supply piping; an outflow joint through which the water flows out to downstream water supply piping; a drainage joint that drains the water in the downstream water supply piping. The hot-water side joint comprises a hot-water receiving joint through which the hot-water from the hot-water supply piping flows, and a hot-water discharge joint through which the hot-water in the hot-water supply piping is discharged. These joints are arranged in series along the length direction of the valve box, and are independently rotatable in a circumferential direction of the valve box.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a hot and cold water faucet that can simultaneously discharge the water in the water supply pipe and the hot water in the hot water supply pipe to the outside of the pipe by a single operation, and particularly relates to a hot and cold water faucet suitable for installation on the foundation of a building without being buried underground.

Background Art

[0002] In cold regions, generally, a non-freezing faucet is installed in the middle of the building's water supply pipe for the purpose of preventing the water supply from freezing during winter. There are four types of non-freezing faucets, such as a non-freezing water drain faucet and a non-freezing water faucet post, according to their uses, shapes or structures. Among these, there is a hot and cold water faucet that can simultaneously discharge the water and hot water in the water supply pipe and the hot water supply pipe to the outside of the pipe by a single operation, and an example thereof is disclosed in Patent Document 1.

[0003] The hot and cold water faucet of Patent Document 1 is mainly considered for installation by being buried underground in a detached house, and has a valve box 13 buried underground and an above-ground part connected to the valve box 13 by a pipe 28. The valve box 13 has an inlet 14 and an outlet 15 connected to the water supply pipe, and a drain port 16 and a hot water drain port 17. The above-ground part has a hot water receiving port 32 connected to the hot water supply pipe. A piston 26 is housed in the valve box 13 and is connected to a hot water receiving rod 41 of the above-ground part via a rod 42.

[0004] In this hot and cold water drain valve, when the handle is operated to allow water to flow, water from the upstream water supply pipe flows from the inlet 14 to the outlet 15 and is supplied to the terminal fixture. At this time, the hot water receiving port 32 is blocked by the hot water receiving rod 41, so the hot water in the hot water supply pipe connected to the hot water receiving port 32 is not drained. When the handle is operated to drain the valve, the piston 26 moves, blocking the flow path between the inlet 14 and the outlet 15, and opening the outlet 15 to the drain port 16, allowing the water in the water supply pipe downstream of the hot and cold water drain valve to be drained from the drain port 16. At the same time, the hot water receiving rod 41, which is connected to the piston 26 via the rod 42, also moves, opening the hot water receiving port 32 to the drain port 17, allowing the hot water in the hot water supply pipe to be drained from the drain port 17. In this way, by draining the water and hot water inside the water supply pipe and the hot water supply pipe to the outside of the pipe, it is possible to prevent the water supply pipes from freezing.

[0005] The applicant manufactures and sells the hot and cold water drain valve disclosed in Non-Patent Document 1. This drain valve can be installed without burying it underground, mainly in apartment buildings and other multi-unit dwellings. It is common to install the drain valve inside the pipe shaft next to the entrance so that it is not directly exposed to the outside air. The valve has an inlet and an outlet that connect to the water supply piping, coaxially located on the lower side of the valve body. Below the inlet and outlet, there is a downward-facing drain outlet for discharging water from the downstream water supply piping to the outside. The orientation of each of the inlet, outlet, and drain outlet is fixed. The upper part of the valve body is provided with an inlet (hot water receiving port) that connects to the hot water supply piping and a drain outlet (hot water draining port) for discharging hot water from the hot water supply piping to the outside. The hot water receiving port and the hot water draining port can each rotate independently in the circumferential direction of the valve body and can be directed in any direction to the side. A piston is housed inside the valve body, and a hot water receiving rod is directly connected to the piston.

[0006] Similar to Patent Document 1, when this hot and cold water drain valve is set to the water-flow state by operating the handle, water from the upstream water supply pipe flows from the inlet to the outlet and is supplied to the terminal fixture via the downstream water supply pipe. At this time, the hot water in the hot water supply pipe connected to the hot water receiving port is not drained because it is blocked by the hot water receiving rod. When set to the draining state by operating the handle, the piston moves, blocking the flow path between the inlet and the outlet, opening the connection between the outlet and the drain port, and the water in the downstream water supply pipe is drained from the drain port. At the same time, the hot water receiving rod directly connected to the piston also moves, opening the connection between the hot water receiving port and the hot water drain port, and the hot water in the hot water supply pipe is drained from the hot water drain port via the hot water receiving port. As shown in Non-Patent Document 1, this hot and cold water drain valve can simultaneously discharge water and hot water from both water supply pipes to the outside of the pipes with a single operation.

[0007] Unlike the drain valve described in Patent Document 1, the drain valve described in Non-Patent Document 1 has a piston and a hot water receiving rod directly connected without a rod, and furthermore, the member provided with the inlet and outlet and the member provided with the hot water receiving port are directly connected without a pipe. Therefore, structurally, the drain valve described in Non-Patent Document 1 can be made shorter in overall length than the drain valve described in Patent Document 1. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Patent No. 3620519 [Non-patent literature]

[0009] [Non-Patent Document 1] Technical Data from Hikari Gokin Seisakusho Co., Ltd.: Hot and Cold Water Drain Valve WDL-20mm [Overview of the project] [Problems that the invention aims to solve]

[0010] In recent years, construction methods such as the raft foundation, which integrates the entire ground beneath the floor with concrete, have become widespread in detached houses. When installing a hot and cold water drain valve as shown in Patent Document 1 in a building constructed using this method, it is necessary to bury the valve body 13 of the hot and cold water drain valve in the ground and place the pipe 28 extending from the upper end of the valve body 13 above ground. To do this, a hole must be made in a part of the integrated concrete foundation ground to insert the components above the pipe 28. This creates a problem of increased labor costs due to the creation of a hole in the concrete foundation ground. Furthermore, creating a hole in the foundation ground may allow moisture from the ground and termites to enter through the hole, increasing the labor costs required to address the deterioration of building materials due to these effects. In addition, if the hot and cold water drain valve itself needs to be replaced due to maintenance inspection after installation, it is necessary to excavate the valve body 13 buried in the ground, and drilling work for replacement occurs in the integrated concrete foundation ground.

[0011] To install a hot and cold water drain valve without drilling holes in the concrete foundation, one could consider installing the hot and cold water drain valve described in Non-Patent Document 1 directly onto the concrete foundation. However, the hot and cold water drain valve described in Non-Patent Document 1 is intended for installation within a pipe shaft in apartment buildings and other multi-unit dwellings, where water supply piping is typically installed in a straight line from upstream to downstream. Therefore, this hot and cold water drain valve does not allow for the orientation of the inlet, outlet, and drain connected to the water supply piping to be freely changed. Consequently, in order to drain the water from the outlet to the terminal fixture out of the pipe by gravity through the hot and cold water drain valve, the outlet must be positioned above horizontal. However, since the relative positional relationship between the inlet and outlet cannot be changed, if the outlet is positioned above horizontal, the inlet must be positioned below horizontal, and water cannot be drained by gravity from any other position.

[0012] As described above, the hot and cold water drain valve described in Patent Document 1 has problems in terms of labor costs when used in a construction method in which the entire ground area under the floor is integrated with concrete. Furthermore, the hot and cold water drain valve described in Non-Patent Document 1 has a fixed orientation for both the inlet and outlet connected to the water supply piping, as well as the drain outlet. Therefore, even if it is used horizontally on a foundation ground integrated with concrete, it is not possible to properly supply water from the water supply piping or drain water from within the water supply piping. Moreover, the degree of freedom for piping in the underfloor space is reduced, and the piping configuration is restricted.

[0013] Therefore, the present invention aims to provide a hot and cold water drain valve that improves workability in installation environments with limited installation space, increases the degree of freedom for underfloor piping, and takes into account the ease of maintenance and inspection after installation. [Means for solving the problem]

[0014] The problem of the present invention can be solved by installing the valve body horizontally in the foundation space beneath the floor of a building, and configuring the hot and cold water drain valve so that the joints arranged on the outer circumference of the valve body can rotate freely around the valve body. In this specification, when referring to the foundation, it includes not only the foundation structure itself that forms the base of the building, but also the entire foundation space surrounded by the foundation structure, and the plane surrounding the foundation space includes the foundation ground, the wall surface of the foundation structure (referred to as the foundation wall surface), and the foundation side surface of the floor (referred to as the underside of the floor).

[0015] The present invention provides a water and hot water drain valve for foundation installation that can simultaneously discharge water from a water supply pipe and hot water from a hot water supply pipe to the outside of the pipe in a single operation. The water and hot water drain valve according to the present invention comprises a valve body installed so as to be horizontal in its longitudinal direction. Inside the valve body is a piston that is linearly movable along its longitudinal direction. A water-side fitting and a hot water-side fitting are arranged on the outer circumference of the valve body. The water and hot water drain valve further comprises an operating part for moving the piston.

[0016] The water-side fittings include an inlet fitting through which water flows in from the upstream water supply pipe, an outlet fitting through which water flows out into the downstream water supply pipe, and a drain fitting for discharging water from the downstream water supply pipe. The hot water-side fittings include a hot water receiving fitting through which hot water flows in from the hot water supply pipe, and a hot water drain fitting for discharging hot water from the hot water supply pipe. These fittings are arranged in series along the length of the valve body, and each is independently rotatable in the circumferential direction of the valve body.

[0017] In one embodiment, the operating unit includes an input unit for inputting a force to move the piston, and a transmission mechanism for transmitting the input force to the piston. Preferably, the input unit is positioned laterally with respect to the direction of piston movement.

[0018] In one embodiment, the operating section has a handle that generates rotational force around a rotation axis. The operating section further includes a handle-side bevel gear that rotates around a rotation axis coaxial with the rotation axis of the handle as the handle rotates, a bracket that supports the handle-side bevel gear, a piston-side bevel gear that is arranged to mesh with the handle-side bevel gear and rotates around a rotation axis perpendicular to the rotation axis of the handle-side bevel gear as the handle-side bevel gear rotates, and a spindle that is connected to both the piston and the piston-side bevel gear and rotates around the axis while moving linearly in the axial direction of the piston as the piston-side bevel gear rotates.

[0019] In one embodiment, the hot and cold water drain valve further comprises a gland connecting the operating part and the valve body, and having an axial hole through which a spindle passes. Preferably, the end of the spindle opposite to the end connected to the piston is supported by a bracket, and the end supported by the bracket and the end connected to the piston are further supported by an axial hole.

[0020] In one embodiment, the valve body is provided with a plurality of holes corresponding to the inlet fitting, outlet fitting, drain fitting, hot water receiving fitting, and hot water drain fitting, each at equal intervals along the circumference. In one embodiment, the hot and cold water drain valve further includes a mounting portion for a fixing device for horizontally installing the valve body. [Effects of the Invention]

[0021] According to the present invention, even in a construction method in which the entire floor surface under the floor is integrated with concrete, it is possible to provide a hot and cold water faucet with a high degree of freedom in piping in the under-floor space and few restrictions on the piping configuration without increasing the number of working hours. Furthermore, according to the present invention, it is possible to provide a hot and cold water faucet that enables easy maintenance and inspection even when product replacement is required after installation.

Brief Description of the Drawings

[0022] [Figure 1] A longitudinal sectional view of the water passing state of the hot and cold water faucet according to an embodiment of the present invention is shown. [Figure 2] A longitudinal sectional view of the water draining state of the hot and cold water faucet according to an embodiment of the present invention is shown. [Figure 3] An example of installing the hot and cold water faucet according to an embodiment of the present invention on the foundation floor of a detached house is shown, where (a) is the normal installation state and (b) is the installation state near the foundation wall surface.

Embodiments for Carrying Out the Invention

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a longitudinal sectional view of the water passing state of the hot and cold water faucet 1 according to an embodiment of the present invention, and FIG. 2 shows a longitudinal sectional view of the water draining state of the hot and cold water faucet 1. First, the structure of the hot and cold water faucet 1 will be described using FIG. 1.

[0024] [Structure of the hot and cold water faucet 1] The hot and cold water drain valve 1 comprises a hollow valve body 20 installed on the foundation ground of a building so as to be horizontal in its longitudinal direction, and a piston 60 that moves inside the valve body 20 along the longitudinal direction of the valve body 20. The valve body 20 is provided with a plurality of through holes 21d, 21e, 22d, 22e, and 22f that penetrate its walls. On the outer circumference of the valve body 20, water-side fittings 30 (31, 32, 33) and hot water-side fittings 40 (41, 42) are rotatably attached in the circumferential direction of the valve body 20 at positions corresponding to the through holes 21d, 21e, 22d, 22e, and 22f, respectively. The water-side fitting 30 includes an inlet fitting 31 into which water flows in from the water supply pipe, an outlet fitting 32 into which water flows out to the water supply pipe, and a drain fitting 33 for draining water from the water supply pipe downstream of the hot and cold water drain valve 1. The hot-water-side fitting 40 includes a hot water receiving fitting 41 into which hot water flows in from the hot water supply pipe, and a hot water drain fitting 42 for draining hot water from the hot water supply pipe. The inlet fitting 31, outlet fitting 32, drain fitting 33, hot water receiving fitting 41, and hot water drain fitting 42 can each be rotated independently.

[0025] An operating part 80 for linearly moving the piston 60 in the longitudinal direction of the valve body 20 is provided at one end of the valve body 20. In this specification, the left side of each component shown in Figure 1 is referred to as one end, and the right side as the other end. By rotating the handle 81 of the operating part 80, the piston 60 can be moved inside the valve body 20 in the left or right direction as shown in Figure 1. When the piston 60 is moved to the position shown in Figure 1, that is, the leftmost position, by the rotation of the handle 81, the hot and cold water drain valve 1 is in a water flow state. In this state, water from the upstream water supply pipe flows into the inside of the valve body 20 from the inlet joint 31, and the water that has flowed in flows out to the downstream water supply pipe from the outlet joint 32.

[0026] Furthermore, when the piston 60 is moved to the position shown in Figure 2, that is, the position furthest to the right, by the rotation of the handle 81, the hot and cold water drain valve 1 is in a draining state. In this state, water from the downstream water supply pipe flows into the valve body 20 from the outlet joint 32, and the water that has flowed in is discharged from the drain joint 33. At the same time, hot water from the hot water supply pipe flows into the valve body 20 from the hot water receiving joint 41, and the hot water that has flowed in is discharged from the hot water drain joint 42.

[0027] The structure of the hot and cold water drain valve 1 will be described in detail below, part by part. (Lunchbox 20) The hot and cold water drain valve 1 includes a hollow, cylindrical valve body 20. From the viewpoint of ease of manufacture, the valve body 20 is preferably constructed by combining two cylindrical parts. That is, the valve body 20 is preferably formed by screwing together a female thread 21g provided at the other end of a hollow cylindrical first valve body 21 with both ends open, and a male thread 22h provided at one end of a hollow cylindrical second valve body 22 with one end open and the other end closed. In another embodiment, the valve body 20 may be constructed as a single integrally formed member rather than by combining two parts. In yet another embodiment, the first valve body 21 and the second valve body 22 may be connected by welding their ends together. A male thread 21h is provided at one end of the first valve body 21, and a female thread 86c provided at the other end of the gland 86, which will be described later, is screwed into the male thread 21h.

[0028] (Valve box 20: First valve box 21) On the inner surface of the first valve body 21, cylinder portions 21a, 21b, and 21c are formed adjacent to each other in the longitudinal direction of the first valve body 21. As will be described later, the O-rings 70, 71, and 72 provided on the piston 60 slide over the cylinder portions 21a, 21b, and 21c as the piston 60 moves. Between cylinder portion 21a and cylinder portion 21b, six through holes 21d are provided at equal intervals in the circumferential direction of the first valve body 21. Between cylinder portion 21b and cylinder portion 21c, six through holes 21e are provided at equal intervals in the circumferential direction of the first valve body 21.

[0029] The through-hole 21d is located at a position corresponding to the inlet fitting 31, which will be described later, and the through-hole 21e is located at a position corresponding to the outlet fitting 32, which will be described later. When water is flowing, water from the upstream water supply piping flows into the first valve box 21 through the six through-holes 21d. The water that has flowed in flows out of the first valve box 21 through the six through-holes 21e. When the water is drained, water from the downstream water supply piping flows into the first valve box 21 through the six through-holes 21e.

[0030] The number of through-holes 21d and 21e is not limited to six each, as long as it does not hinder water supply and drainage. Furthermore, the diameters of the through-holes 21d and 21e are not particularly limited, as long as they do not create resistance to water flow. Also, the shape of the through-holes 21d and 21e is not limited to circular shapes; they may be other shapes, such as squares.

[0031] (Valve box 20: Second valve box 22) On the inner surface of the second valve body 22, an inner wall portion 22a and cylinder portions 22b and 22c are formed adjacent to each other in the longitudinal direction of the second valve body 22. As will be described later, the cylinder portions 22b and 22c are the parts on which the O-rings 73 and 74 provided on the piston 60 slide as the piston 60 moves. Between the inner wall portion 22a and the cylinder portion 22b, four through holes 22d are provided at equal intervals in the circumferential direction of the second valve body 22. Between the cylinder portion 22b and the cylinder portion 22c, four through holes 22e are provided at equal intervals in the circumferential direction of the second valve body 22. Between the cylinder portion 22c and the closed end of the second valve body 22, four through holes 22f are provided at equal intervals in the circumferential direction of the second valve body 22.

[0032] The through-hole 22d is located at a position corresponding to the drain fitting 33 described later, the through-hole 22e is located at a position corresponding to the hot water receiving fitting 41 described later, and the through-hole 22f is located at a position corresponding to the hot water drain fitting 42 described later. When the water is drained, water from the downstream water supply piping that flows into the first valve box 21 through the six through-holes 21e enters the second valve box 22 and flows out of the second valve box 22 through the four through-holes 22d. Also, when the water is drained, hot water from the hot water supply piping flows into the second valve box 22 through the four through-holes 22e. The flowing hot water flows out of the second valve box 22 through the four through-holes 22f.

[0033] The number of through-holes 22d, 22e, and 22f is not limited to four, as long as it does not hinder drainage and hot water discharge. Furthermore, the diameters of the through-holes 22d, 22e, and 22f are not particularly limited, as long as they do not create resistance to the flow of water or hot water. Also, the shape of the holes 22d, 22e, and 22f is not limited to circular shapes; they may be other shapes, such as squares.

[0034] In this embodiment, the inner diameters of the inner wall portion 22a and the cylinder portions 22b and 22c of the second valve box 22 are formed to be slightly smaller than the inner diameters of the cylinder portions 21a, 21b, and 21c of the first valve box 21. This is due to the difference in the amount of water flowing through each cylinder portion. Specifically, it is desirable for the cylinder portions 21a, 21b, and 21c of the first valve box 21 to have a larger water flow to supply water to the end fixtures in the room via the hot and cold water drain valve 1 from the upstream side of the hot and cold water drain valve 1, while the inner wall portion 22a and the cylinder portions 22b and 22c of the second valve box 22 only need to have a water flow sufficient to drain the water from the downstream water supply piping and the hot water from the hot water supply piping. However, there is no problem if the inner diameters of the inner wall portion 22a and the cylinder portions 22b and 22c of the second valve box 22 are enlarged to the same diameter as the inner diameters of the cylinder portions 21a, 21b, and 21c of the first valve box 21.

[0035] (Water side joint 30) The water-side fitting 30 includes an inlet fitting 31, an outlet fitting 32, and a drain fitting 33. The inlet fitting 31 is configured to connect to the water supply piping upstream of the hot and cold water drain valve 1, and has a ring portion 31a through which the first valve box 21 is inserted, and an inlet 31b that protrudes from the ring portion 31a and into which water from the water supply piping flows. The outlet fitting 32 is configured to connect to the downstream water supply piping that supplies water to the end fixtures inside the room, and has a ring portion 32a through which the first valve box 21 is inserted, and an outlet 32b that protrudes from the ring portion 32a and into which water flows out into the water supply piping. The drain fitting 33 has a ring portion 33a through which the second valve box 22 is inserted, and a drain port 33b that protrudes from the ring portion 33a and discharges water from the downstream water supply piping up to the end fixtures to the outside of the pipe.

[0036] The inlet fitting 31 is rotatably mounted circumferentially on the outer circumference of the multiple through holes 21d of the first valve box 21. O-rings 50 and 51 are fitted to the outer circumference of the first valve box 21, and the ring portion 31a slides against the O-rings 50 and 51 to rotate, thereby maintaining watertightness between the first valve box 21 and the inlet fitting 31. Similarly, the outlet fitting 32 is rotatably mounted circumferentially on the outer circumference of the multiple through holes 21e of the first valve box 21, and watertightness between the ring portion 32a and the first valve box 21 is maintained by O-rings 52 and 53 fitted to the outer circumference of the first valve box 21. Furthermore, the drain fitting 33 is rotatably mounted circumferentially on the outer circumference of the through hole 22d of the second valve box 22, and watertightness between the ring portion 33a and the second valve box 22 is maintained by O-rings 54 and 55 fitted to the outer circumference of the second valve box 22.

[0037] (Hot water side joint 40) The hot water side joint 40 includes a hot water receiving joint 41 and a hot water draining joint 42. The hot water receiving joint 41 is configured so that a hot water supply pipe that supplies hot water from the indoor hot water supply equipment to the terminal appliance branches off and is connected, and has a ring portion 41a through which the second valve box 22 is inserted, and a hot water receiving port 41b that protrudes from the ring portion 41a and into which hot water from the hot water supply pipe flows. The hot water draining joint 42 has a ring portion 42a through which the second valve box 22 is inserted, and a hot water draining port 42b that protrudes from the ring portion 42a and discharges the hot water in the hot water supply pipe from the hot water supply equipment to the terminal appliance to the outside of the pipe.

[0038] The hot water receiving joint 41 is rotatably mounted in the circumferential direction on the outer circumference of the multiple through holes 22e of the second valve box 22, and the watertightness between the ring portion 41a and the second valve box 22 is maintained by O-rings 56 and 57 fitted on the outer circumference of the second valve box 22. The hot water draining joint 42 is rotatably mounted in the circumferential direction on the outer circumference of the multiple through holes 22f of the second valve box 22, and the watertightness between the ring portion 42a and the second valve box 22 is maintained by O-rings 58 and 59 fitted on the outer circumference of the second valve box 22.

[0039] (The advantage of having the water-side joint 30 and the hot water-side joint 40 each rotate independently.) As described above, the inlet fitting 31, outlet fitting 32, and drain fitting 33 included in the water-side fitting 30 are each independently rotatable, and the hot water receiving fitting 41 and hot water drain fitting 42 included in the hot water-side fitting 40 are also each independently rotatable. The advantages of each fitting being independently rotatable are as follows. In other words, in the hot and cold water drain valve shown in Non-Patent Literature 1, which is used with the length direction of the valve body being vertical, the inlet into which water flows from the upstream water supply piping and the outlet that supplies water to the end fixtures in the room are provided integrally in a single member so as to be located coaxially, and the structure does not allow the direction of the inlet and outlet to be changed independently. Therefore, if the outlet is positioned higher than horizontal in order to drain water using a conventional hot and cold water drain valve in a horizontal position, the inlet will inevitably be positioned lower than horizontal, and water in the downstream water supply piping cannot be discharged by gravity at any other position. Furthermore, the degree of freedom of piping in the underfloor space is reduced, and the piping configuration is restricted. Furthermore, in the hot and cold water drain valve shown in Patent Document 1, the inlet into which water flows in from the upstream water supply pipe and the outlet that supplies water to the end fixtures inside the room are provided as separate members located on different axes, and the direction of the inlet and outlet can be changed independently. However, the outlet and drain are provided integrally in a single member, and the direction of the outlet and drain are fixed and cannot be changed independently. In contrast, in the hot and cold water drain valve 1 according to the present invention, all joints are rotatable independently, which improves workability and greatly increases the degree of freedom of underfloor piping.

[0040] (Piston 60) The hot and cold water drain valve 1 includes a piston 60 that moves inside the valve body 20 along its longitudinal direction. From the viewpoint of ease of manufacture, the piston 60 is preferably composed of two parts. It is preferable to combine a first piston 61 and a second piston 62, each having a length that extends in the longitudinal direction of the valve body 20, in the longitudinal direction, for example by screwing or welding. In another embodiment, the piston 60 may be composed of a single integrally formed member rather than composed of two parts.

[0041] (Piston 60: First piston 61) The first piston 61 has a plurality of protrusions on its outer surface, and each of the plurality of protrusions is fitted with an O-ring 70 that slides against the cylinder portion 21a of the first valve body 21, an O-ring 71 that slides against the cylinder portion 21b, and an O-ring 72 that slides against the cylinder portion 21c. Between adjacent protrusions, a space is provided for water to flow between each cylinder portion of the first valve body 21. One end of the first piston 61 is provided with a fitting projection 61a having a groove extending in the circumferential direction, and this fitting projection 61a is connected to a fitting recess 85a provided on the other end of the spindle 85, which will be described later. The other end of the first piston 61 is provided with a male screw 61b.

[0042] (Piston 60: Second piston 62) The second piston 62 has multiple protrusions on its outer surface, and each of these protrusions is fitted with an O-ring 73 that slides against the cylinder portion 22b of the second valve body 22 and an O-ring 74 that slides against the cylinder portion 22c. Between adjacent protrusions, a space is provided for water and hot water to flow between each cylinder portion of the second valve body 22. One end of the second piston 62 is provided with a female thread 62a, and the male thread 61b of the first piston 61 is screwed into the female thread 62a, thereby connecting the first piston 61 and the second piston 62.

[0043] (Operation unit 80) The hot and cold water drain valve 1 has an operating section 80 for linearly moving a piston 60 in the longitudinal direction of the valve body 20. The operating section 80 has an input section for inputting a force to linearly move the piston 60, and a transmission mechanism for transmitting the input force to the piston 60. In this embodiment, the operating section 80 includes a handle 81 which is the input section, and a transmission mechanism consisting of a handle coupling 82, a handle-side bevel gear 87, a piston-side bevel gear 88, and a spindle 85. The operating section 80 further includes a cover 83, a bracket 84, and a gland 86. The rotational force input from the handle 81 is converted into linear movement of the piston 60 via the handle coupling 82, the handle-side bevel gear 87, the piston-side bevel gear 88, and the spindle 85. The handle 81 is positioned laterally to the direction of linear movement of the piston 60, and the axis of rotation of the handle 81 is perpendicular to the direction of linear movement of the piston 60. With the handle 81, which is the input unit, positioned in this manner, even if the valve body 20 is located under the floor with its length parallel to the foundation ground 100 (see Figure 3), the handle 81 can be easily accessed from above to operate the hot and cold water drain valve 1.

[0044] (Relationship between the operating section 80, handle 81, handle joint 82, and handle-side bevel gear 87) The handle 81 is attached to the upper end of a handle joint 82, which has a length extending in the vertical direction, and can generate rotational force around the rotation axis of the handle joint 82 (coaxial with the rotation axis of the handle 81). A fitting portion 82a is provided at the upper end of the handle joint 82, which is inserted through a hole provided in the center of the handle 81 and fixed to the handle 81 by a screw. A handle-side bevel gear 87 is attached to the lower end of the handle joint 82, which rotates around a rotation axis coaxial with the rotation axis of the handle 81 as the handle 81 rotates. A connecting portion 82c is provided at the lower end of the handle joint 82, which is inserted through an axial hole 87a provided on the rotation axis of the handle-side bevel gear 87.

[0045] The handle joint 82 and the handle-side bevel gear 87 are fixed together by a pin 90 inserted through a lateral hole 82d that penetrates the handle joint 82 radially and a lateral hole 87b in the handle-side bevel gear 87. That is, the pin 90 passes through both the lateral hole 82d and the lateral hole 87b. The handle joint 82 is inserted through an axial hole 84b provided on the upper surface of the bracket 84, and is held in place by the flange portion 82b provided in the approximate middle of the handle joint 82 and the handle-side bevel gear 87 sandwiching the upper surface of the bracket 84. That is, the handle-side bevel gear 87 is supported by the bracket 84.

[0046] (Relationship between operating section 80, spindle 85, gland 86, and piston-side bevel gear 88) The gear of the handle-side bevel gear 87 meshes with the gear of the piston-side bevel gear 88, which is positioned to have a rotation axis perpendicular to the rotation axis of the handle-side bevel gear 87. Therefore, the piston-side bevel gear 88 rotates around a rotation axis perpendicular to the rotation axis of the handle-side bevel gear 87 as the handle-side bevel gear 87 rotates. A shaft hole 88a is provided on the rotation axis of the piston-side bevel gear 88, and a spindle 85 is inserted through the shaft hole 88a. A male screw 21h provided at one end of the valve body 20 and a female screw 86c provided at the other end of the hollow gland 86 are connected by screwing. The piston-side bevel gear 88 is held in place by contact with one end face of the gland 86 and by meshing with the handle-side bevel gear 87.

[0047] At the center of one end of the grand 86, a shaft hole 86d is provided at a position corresponding to the shaft hole 88a of the piston-side bevel gear 88, and the spindle 85 (more specifically, the shaft portion 85d of the spindle 85) is inserted through the shaft hole 86d and the shaft hole 88a. At the other end of the spindle 85, a fitting recess 85a is provided, and the fitting recess 85a is connected to the fitting projection 61a of the first piston 61 as described above.

[0048] The piston-side bevel gear 88 is provided with a lateral hole 88b, through which the pin 91 is inserted. The spindle 85's shaft portion 85d is provided with an elongated hole 85e that penetrates radially through the shaft portion 85d, and the pin 91 is also inserted through this elongated hole 85e. In other words, the pin 91 passes through both the lateral hole 88b and the elongated hole 85e. The elongated hole 85e is formed such that its width is slightly larger than the diameter of the pin 91, allowing the pin 91 to move within it. The spindle 85 has a male thread 85c between the fitting recess 85a and the shaft portion 85d, which is screwed into a female thread 86b provided on the inner wall of the gland 86. With this configuration, as the piston-side bevel gear 88 rotates, the spindle 85 rotates around its longitudinal axis and moves in the longitudinal direction. As the spindle 85 moves along its length, the piston 60 connected to the other end of the spindle 85 moves linearly along its axis.

[0049] (Operation section 80: Bracket 84 and cover 83) A bracket 84, having a roughly U-shaped cross-section parallel to the plane of the paper in Figure 1, is attached to one end of the ground 86. The bracket 84 has a ground connecting portion 84c with a bolt insertion hole at the other end, and is fixed to the ground 86 by fastening the ground connecting portion 84c and a bracket connecting portion 86e, which has a bolt insertion hole and is provided on one end of the ground 86, with bolts. The positions of the ground connecting portion 84c, the bracket connecting portion 86e, and the bolts that connect the two members are shown by dotted lines in the vertical direction relative to the plane of the paper in Figure 1, but in reality there are two locations, one near the front and one far from the plane of the paper, that are nearly horizontal. A support portion 84a is provided at one end of the bracket 84, formed as a through hole, opposite the shaft hole 86d of the ground 86, and one end of the shaft portion 85d of the spindle 85 is inserted through the support portion 84a.

[0050] The operating section 80 preferably further includes a cover 83 formed in a shape that covers a part of the bracket 84 and the open surface of the bracket 84. The cover 83 is provided so as to cover at least one end of the bracket 84, the handle-side bevel gear 87, and the piston-side bevel gear 88. The cover 83 is fixed to the bracket 84 by screwing a screw inserted through the screw hole 83b into the female thread 84d of the bracket 84. The cover 83 is provided with a through hole 83a at a position corresponding to the support portion 84a of the bracket 84, and the shaft portion 85d of the spindle 85 is inserted through the through hole 83a.

[0051] The spindle 85 is supported at one end of its shaft portion 85d by the support portion 84a of the bracket 84, and at the other end by the shaft hole 86d of the gland 86. This double-ended support of the shaft portion 85d offers the following advantages. If only the other end were supported by the shaft hole 86d of the gland 86, the weight of the piston-side bevel gear 88 would be applied to the shaft portion 85d of the spindle 85, potentially affecting the handle operating force and the durability of the operating part 80. However, with the shaft portion 85d supported at both ends, the issue of heavy handle operation can be eliminated. Furthermore, repeated handle operation reduces wear caused by the shaft portion 85d of the spindle 85 sliding inside the support portion 84a and the shaft hole 86d, as well as wear on the walls of the elongated hole 85e caused by the movement of the pin 91 inside the elongated hole 85e during handle operation. Furthermore, a spacer 94 is provided extending from one inner wall surface of the bracket 84 to one end surface of the piston-side bevel gear 88, covering the outer circumference of the shaft portion 85d of the spindle 85. This spacer 94 has the function of further retaining the piston-side bevel gear 88 in a predetermined position when the handle is operated, and also has the effect of further reducing wear between the aforementioned components.

[0052] In the operating section 80 of this embodiment, as described above, a handle-side bevel gear 87 and a piston-side bevel gear 88 that rotates around a rotation axis perpendicular to its rotation axis are used, and a configuration is adopted in which the rotational force of the input section, the handle 81, is converted into linear movement of the piston 60 via a transmission mechanism consisting of a handle coupling 82, the handle-side bevel gear 87, the piston-side bevel gear 88, and a spindle 85. However, it is not limited to this, and a worm gear can be used instead of a bevel gear as the transmission mechanism, although it is not shown. Alternatively, a mechanism using a universal joint, shown as reference numeral 13 in Figure 2 of Japanese Utility Model Publication No. 58-45337, or a wire, shown as reference numeral 18 in Figures 1 and 2 of Japanese Utility Model Publication No. 50-45713, can also be used as another transmission mechanism. In any of these embodiments, the input section for inputting the force to move the piston is positioned laterally with respect to the direction of piston movement.

[0053] (Assembly of the hot and cold water drain valve 1) A hot and cold water drain valve 1 according to one embodiment of the present invention is assembled as follows. First, O-rings 50, 51, 52, and 53 are attached to the outer circumference of the first valve body 21. The outlet joint 32 and the inlet joint 31 are inserted into the first valve body 21 in order from one end of the first valve body 21 opposite to the flange 21f. Since the other end of the first valve body 21 is provided with a flange 21f, the outlet joint 32 is positioned in a predetermined position by contacting the flange 21f, and the inlet joint 31, which is inserted afterward, is also positioned in a predetermined position by contacting the outlet joint 32. Next, O-rings 54, 55, 56, 57, 58, and 59 are attached to the outer circumference of the second valve body 22. The hot water drain joint 42, the hot water receiving joint 41, and the drainage joint 33 are inserted into the second valve body 22 in order from one end of the second valve body 22 (the side with the male thread 22h). Since a flange 22g is provided at the other end of the second valve box 22, the drain joint 42 is positioned in a predetermined position by contacting the flange 22g, and the receiving joint 41, which is inserted thereafter, is also positioned in a predetermined position by contacting the drain joint 42. Furthermore, the drain joint 33, which is inserted thereafter, is also positioned in a predetermined position by contacting the receiving joint 41. Finally, the first valve box 21 and the second valve box 22 are connected by screwing together the female thread 21g provided inside the flange 21f of the first valve box 21 and the male thread 22h of the second valve box 22. The drain joint 33, the receiving joint 41 and the drain joint 42 can be held in place by being sandwiched between the flange 21f of the first valve box 21 and the flange 22g of the second valve box 22. The watertight seal between the first valve body 21 and the second valve body 22 is maintained by an O-ring 93.

[0054] Next, the first piston 61 and the second piston 62 are connected by screwing together the male thread 61b provided on the other end of the first piston 61 and the female thread 62a provided on one end of the second piston 62, thereby forming the piston 60. The spindle 85 is then assembled to the piston 60 by connecting the fitting projection 61a provided on one end of the first piston 61 and the fitting recess 85a provided on the other end of the spindle 85. The shaft portion 85d of the spindle 85 is inserted through the shaft hole 86d of the gland 86, and the male thread 85c of the spindle 85 is screwed into the female thread 86b of the gland 86. The shaft portion 85d of the spindle 85 is inserted through the shaft hole 88a of the piston-side bevel gear 88, and the pin 91 is inserted so as to penetrate both the lateral hole 88b of the piston-side bevel gear 88 and the elongated hole 85e of the spindle 85. These assembled components are inserted into the valve body 20 from the left side of the paper, and the female thread 86c of the gland 86 is screwed into the male thread 21h of the first valve body 21. The inlet fitting 31 and outlet fitting 32 can be held in place by being sandwiched between the lower part 86a of the gland 86 and the flange 21f of the first valve body 21.

[0055] Next, the fitting portion 82a of the handle joint 82 is inserted through the shaft hole of the handle 81 and secured with a screw. The connecting portion 82c of the handle joint 82, to which the handle 81 is assembled, is inserted through the shaft hole 84b of the bracket 84. The connecting portion 82c of the handle joint 82, which protrudes into the inside of the bracket 84, is inserted through the shaft hole 87a of the handle-side bevel gear 87. The handle joint 82 and the handle-side bevel gear 87 are fixed together by a pin 90 inserted through both the lateral hole 82d of the handle joint 82 and the lateral hole 87b of the handle-side bevel gear 87.

[0056] In the bracket 84 to which the handle 81, handle coupling 82, and handle-side bevel gear 87 are assembled, the shaft portion 85d of the spindle 85 assembled above is inserted through the support portion 84a of the bracket 84, and the bracket 84 is moved from one direction to the other. When the bracket 84 is moved to the predetermined position, some of the gears of the handle-side bevel gear 87 and the piston-side bevel gear 88 mesh together. Finally, the shaft portion 85d of the spindle 85 is inserted through the through hole 83a of the cover 83, and the cover 83 is moved from one direction to the other to cover the open surface of the bracket 84, and a screw is inserted through the screw hole 83b of the cover 83 and screwed into the female thread 84d of the bracket 84, thereby fixing the cover 83 to the bracket 84.

[0057] (fixture 92) The hot and cold water drain valve 1 can be installed on a concrete foundation using two fixing devices 92. Each fixing device 92 has a ring portion 92a, a leg portion 92b, and a base portion 92c. The lower portion 86a of the ground 86, which is the mounting portion of the fixing device 92, and the flange portion 21f of the first valve box 21 are inserted through the ring portion 92a of the fixing device 92. Below the ring portion 92a of the fixing device 92, the base portion 92c is provided via the leg portion 92b, and the fixing device 92 is fixed to the concrete foundation using anchor bolts or the like through holes provided in the base portion 92c. It is preferable to install the hot and cold water drain valve 1 at a position slightly above the concrete foundation so that the length direction of the valve box 20 is horizontal to the ground. This is because, in order to allow the water discharged from the drain port 33b and the hot water discharged from the hot water port 42b to flow into the drain pipe during drainage and hot water drainage, it is preferable to install the hot and cold water drain valve 1 at a position somewhat above the ground for the purpose of constructing the drain pipe. Furthermore, in this embodiment, it is preferable that the ring portion 92a, the leg portion 92b, and the base portion 92c that constitute the fixing device 92 are made of separate components. By making these components separate, the installation height of the hot and cold water drain valve 1 can be adjusted by cutting the leg portion 92b as needed. In this embodiment, the fixing device 92 is made of commercially available synthetic resin, but it may also be made of metal.

[0058] [Operation of the hot and cold water drain valve 1] Next, we will explain the operation of the hot and cold water drain valve 1. (Water flowing state) Figure 1 shows the internal structure of the hot and cold water drain valve 1 when water is flowing. When water is flowing, the O-ring 70 attached to the first piston 61 is in close contact with the cylinder portion 21a of the first valve body 21, and the O-ring 72 is in close contact with the cylinder portion 21c, but the O-ring 71 is not in contact with anything. Also, the O-ring 73 attached to the second piston 62 is in close contact with the cylinder portion 22b of the second valve body 22, and the O-ring 74 is in close contact with the cylinder portion 22c.

[0059] At this time, water from the water supply piping upstream of the hot and cold water drain valve 1 flows from the inlet 31b of the inlet fitting 31 through the through hole 21d of the first valve body 21, through the gap between the first valve body 21 and the first piston 61, through the through hole 21e and the outlet 32b of the outlet fitting 32, and flows through the downstream water supply piping to be supplied to the terminal equipment. The water inside the valve body 20 is sealed off by the O-rings 70 and 72 that are in close contact with the cylinder parts 21a and 21c, and there is no leakage to either the operating part 80 side or the drain fitting 33 side.

[0060] Furthermore, the hot water in the hot water supply piping connected to the hot water receiving port 41b of the hot water receiving joint 41 flows from the receiving port 41b through the through hole 22e into the second valve box 22, but is stopped by the O-rings 73 and 74 that are tightly fitted to the cylinder parts 22b and 22c, so there is no leakage elsewhere.

[0061] (Drainage / water drainage status) Figure 2 shows the internal structure of the hot and cold water drain valve 1 when it is in the draining / hot water discharge state. When transitioning from the water flow state shown in Figure 1 to the draining / hot water discharge state shown in Figure 2, the hot and cold water drain valve 1 operates as follows. First, from the water flow state in Figure 1, the handle 81 is rotated clockwise when viewed from the top of the page. Then, the handle-side bevel gear 87, which is connected to the handle 81 via the handle coupling 82, also rotates clockwise when viewed from the top of the page. As the handle-side bevel gear 87 rotates, the piston-side bevel gear 88, which meshes with the handle-side bevel gear 87, rotates clockwise when viewed from the left of the page. The piston-side bevel gear 88 rotates while remaining in a predetermined position due to the meshing of the end face of the gland 86 and the handle-side bevel gear 87. When the piston-side bevel gear 88 rotates, the spindle 85, which is engaged by the pin 91, also rotates clockwise around its longitudinal axis. The male thread 85c of the spindle 85 is screwed into the female thread 86b of the gland 86, and the width of the elongated hole 85e is formed to be slightly larger than the diameter of the pin 91, so that the pin 91 can move within the elongated hole 85e of the spindle 85. As a result, the spindle 85 rotates and moves to the right in the plane of the paper. The piston 60, which is fitted with the spindle 85, moves to the right within the valve body 20 without rotating as the spindle 85 moves. As the piston 60 moves, the O-ring 71 attached to the first piston 61 comes into close contact with the cylinder portion 21b, and the O-ring 72 comes away from the cylinder portion 21c. Furthermore, the O-ring 74 attached to the second piston 62 comes away from the cylinder portion 22c. In this operation, the hot and cold water drain valve 1 transitions from the water flow state shown in Figure 1 to the drainage / hot water drain state shown in Figure 2.

[0062] In the state shown in Figure 2, water from the water supply piping upstream of the hot and cold water drain valve 1 is stopped by the tight seal between the O-ring 71 and the cylinder part 21b. Meanwhile, the water remaining in the water supply piping up to the downstream end fixture flows from the outlet 32b of the outlet fitting 32 through the through hole 21e, through the gap between the first valve body 21 and the first piston 61, into the gap between the second valve body 22 and the second piston 62, and is discharged outside the pipe (outside the water supply piping) through the through hole 22d and the drain port 33b of the drain fitting 33.

[0063] Furthermore, the hot water in the hot water supply piping connected to the hot water receiving port 41b of the hot water receiving joint 41 flows from the hot water receiving port 41b through the through hole 22e into the second valve box 22, flows through the gap between the second valve box 22 and the second piston 62, and is discharged outside the pipe (outside the hot water supply piping) through the through hole 22f and the hot water drain port 42b of the hot water draining joint 42.

[0064] [Installation of hot and cold water drain valves] Figure 3 shows an example of a hot and cold water drain valve 1 according to one embodiment of the present invention installed on the foundation ground in the foundation space of a detached house. Figure 3(a) shows the normal installation state, and Figure 3(b) shows the state in which it is installed near the foundation wall. The hot and cold water drain valve 1 is fixed to the concrete foundation ground 100 by inserting anchor bolts through holes provided in its base portion 92c using two fasteners 92. The hot and cold water drain valve 1 is installed with the length direction of the valve body 20 horizontal to the foundation ground 100, and at a position slightly above the foundation ground 100.

[0065] In Figure 3(a), the inlet fitting 31 of the hot and cold water drain valve 1 is connected to the upstream water supply pipe 102, the outlet fitting 32 to the downstream water supply pipe 103, the drain fitting 33 to the drain pipe 104, the hot water receiving fitting 41 to the hot water supply pipe 105, and the hot water drain fitting 42 to the hot water drain pipe 106. The upstream water supply pipe 102 is installed horizontally to the foundation ground 100. The downstream water supply pipe 103 is installed with a slight downward slope from right to left on the page so that when the water is drained, the water in the downstream water supply pipe 103 flows into the outlet fitting 32 by gravity. Similarly, the drain pipe 104 is also installed with a downward slope from right to left on the page so that when the water is drained, the water in the downstream water supply pipe 103 flows into the drain pipe 104 via the outlet fitting 32 and the drain fitting 33.

[0066] The hot water supply piping 105 is installed with a downward slope from right to left in the diagram so that when the water is drained, the hot water inside the piping flows into the hot water receiving joint 41 by gravity. Similarly, the drain pipe 106 is also installed with a downward slope from right to left in the diagram so that when the water is drained, the hot water inside the hot water supply piping 105 flows into the drain pipe 106 via the hot water receiving joint 41 and the drain pipe 42. Although not shown in the diagram, a floor with an inspection opening is installed above the handle 81, and the handle of the hot and cold water drain valve 1 is operated by opening the door of the inspection opening.

[0067] Since each joint of the hot and cold water drain valve 1 is independently rotatable in the circumferential direction of the valve body 20, even if the upstream water supply pipe 102 is installed horizontally as shown in Figure 3(a), the downstream water supply pipe 103 and drain pipe 104 can be installed with a downward slope from right to left on the page without being affected by the installation of the upstream water supply pipe 102. Similarly, the hot water supply pipe 105 and drain pipe 106 can also be installed with a downward slope from right to left on the page, as in the embodiment, without being affected by other water supply pipes (i.e., the upstream water supply pipe 102, the downstream water supply pipe 103, drain pipe 104, hot water supply pipe 105, and drain pipe 106).

[0068] When the hot and cold water drain valve 1 is drained, the water in the water supply pipe 103 downstream from the terminal fixture to the hot and cold water drain valve 1 flows through the outlet joint 32, the drain joint 33, and the drain pipe 104 into the drain hopper (drain receiver, not shown), and is ultimately drained from the drainage piping of the entire building. The hot water in the hot water supply pipe 105 from the terminal fixture to the hot and cold water drain valve 1 flows through the hot water receiving joint 41, the hot water drain joint 42, and the hot water drain pipe 106, similar to the water in the water supply pipe 103 downstream, into the drain hopper (drain receiver), and is ultimately drained from the drainage piping of the entire building.

[0069] Figure 3(b) shows the hot and cold water drain valve 1 installed near the foundation wall surface 101 under the floor. Similar to Figure 3(a), the upstream water supply pipe 102 is connected to the inlet fitting 31, the downstream water supply pipe 103 is connected to the outlet fitting 32, the drain pipe 104 is connected to the drain fitting 33, the hot water supply pipe 105 is connected to the hot water receiving fitting 41, and the hot water drain pipe 106 is connected to the hot water drain fitting 42. The upstream water supply pipe 102 is installed horizontally to the foundation ground 100. The downstream water supply pipe 103 is installed vertically to the foundation ground 100. The drain pipe 104 is installed with a downward slope from right to left on the page so that when water is drained, the water in the downstream water supply pipe 103 flows into the drain pipe 104 via the outlet fitting 32 and the drain fitting 33. The hot water supply pipe 105 is installed vertically to the foundation ground 100. The drain pipe 106 is constructed with a downward slope from right to left on the page so that when the water is drained, the hot water in the hot water supply pipe 105 flows into the drain pipe 106 via the hot water receiving joint 41 and the hot water drain joint 42.

[0070] Since each joint of the hot and cold water drain valve 1 is independently rotatable in the circumferential direction of the valve body 20, as shown in Figure 3(b), even if the hot and cold water drain valve 1 is installed near the foundation wall surface 101 and the upstream water supply pipe 102 is installed horizontally, the downstream water supply pipe 103 can be installed vertically without being affected by the upstream water supply pipe 102. Similarly, the hot water supply pipe 105 can also be installed vertically without being affected by other water supply pipes, and the drain pipe 104 and the hot water drain pipe 106 can also be installed with a downward slope from right to left on the page without being affected by other water supply pipes. Furthermore, since the operating part 80 is integrally rotatable in the circumferential direction with the valve body 20, the operating part 80 can be tilted forward as shown in Figure 3(b) to make it easier to operate the handle.

[0071] The location of the hot and cold water drain valve 1 can be any plane surrounding the foundation space, as long as the length of the drain valve 1 is horizontal with respect to the foundation ground 100. For example, although not shown, the fixing device 92 may be fixed to the foundation wall surface 101 instead of the foundation ground 100, and the drain valve 1 may be installed there. Furthermore, although not shown, the fixing device 92 may be fixed to the underside of the floor, and the drain valve 1 may be installed in a suspended manner. Thus, because the hot and cold water drain valve according to the present invention offers a high degree of flexibility in underfloor piping, it can be installed anywhere in the foundation space without being restricted by installation location constraints.

[0072] [Maintenance and inspection work] The maintenance and inspection procedures will be explained using Figure 3(a). If the hot and cold water drain valve 1 itself needs to be replaced, the following procedure will be followed: Close the shut-off valve (not shown) located on the upstream water supply pipe 102. Operate the handle 81 of the hot and cold water drain valve 1 to drain the water from the downstream water supply pipe 103 and hot water supply pipe 105. Remove the water pipes connected to each fitting of the hot and cold water drain valve 1. Remove the hot and cold water drain valve 1 from the fixing device 92.

[0073] When installing a new hot and cold water drain valve 1, attach the hot and cold water drain valve 1 to the fixing device 92. Connect the water pipes to each joint of the hot and cold water drain valve 1. Operate the handle 81 of the hot and cold water drain valve 1 to allow water to flow. Open the shut-off valve (not shown) provided on the upstream water supply pipe 102. As described above, drilling into the concrete foundation ground 100 as in the conventional method is no longer required, and maintenance and inspection of the hot and cold water drain valve 1 can be easily performed. [Explanation of Symbols]

[0074] 1. Hot and cold water drain valve 20 valve boxes 21. First valve box 21a, 21b, 21c Cylinder section 21d, 21e through hole 21f Tsubabe 21g female thread 21h male screw 22. Second valve box 22a Inner wall 22b, 22c Cylinder section 22d, 22e, 22f through hole 22g Tsubabe 22h male screw 30 Water-side joint 31 Inlet fitting 31a Ring section 31b Inlet 32 Outlet fittings 32a Ring section 32b Outlet 33 Drainage fittings 33a Ring section 33b Drain port 40 Hot water side joint 41 Hot water receiving joint 41a Ring section 41b Hot water inlet 42. Drain fitting 42a Ring section 42b Water outlet 50, 51, 52, 53, 54, 55, 56, 57, 58, 59 O-rings 60 pistons 61 First Piston 61a Fitting projection 61b Male screw 62. Second piston 62a Female thread 70, 71, 72, 73, 74 O-rings 80 Control section 81 Handle 82 Handle joint 82a Fitting part 82b Tsubabe 82c connection 82d horizontal hole 83 Cover 83a Through hole 83b Screw hole 84 brackets 84a Support part 84b shaft hole 84c Ground connection section 84d Female thread 85 spindles 85a Fitting recess 85c male screw 85d shaft 85e long hole 86 Grand 86a Lower section 86b Female thread 86c female thread 86d shaft hole 86e Bracket connection part 87 Handle-side bevel gear 87a shaft hole 87b Horizontal hole 88 Piston-side bevel gear 88a Axial hole 88b horizontal hole 90 pins 91 pins 92 Fixtures 92a Ring section 92b Legs 92c Base 93 O-ring 94 Spacers 100 Foundation ground 101 Foundation wall 102 Upstream water supply piping 103 Downstream water supply piping 104 Drainage piping 105 Hot water supply piping 106 Drainage piping

Claims

1. A water supply and hot water drain valve for foundation installation that can simultaneously drain water from a water supply pipe and hot water from a hot water supply pipe to the outside of the pipe with a single operation, A valve body is installed so that its length is horizontal, A piston that can move linearly inside the valve body along the aforementioned longitudinal direction, The water side fitting and the hot water side fitting are arranged on the outer circumference of the valve body, An operating unit for moving the piston, Equipped with, The water-side fitting includes an inlet fitting through which water flows in from the upstream water supply pipe, an outlet fitting through which water flows out into the downstream water supply pipe, and a drain fitting for discharging water from within the downstream water supply pipe. The aforementioned hot water side joint includes a hot water receiving joint into which hot water flows from the hot water supply piping, and a hot water draining joint for discharging hot water from within the hot water supply piping. The inlet joint, outlet joint, drain joint, hot water receiving joint, and hot water drain joint are arranged in series along the longitudinal direction, and each is independently rotatable in the circumferential direction of the valve body. Drain the hot and cold water valve.

2. The operating unit has an input unit for inputting force to move the piston, and a transmission mechanism for transmitting the input force to the piston. The input unit is positioned laterally with respect to the direction of movement of the piston. The hot and cold water drain valve according to claim 1.

3. The aforementioned operating unit is A handle that generates rotational force around the axis of rotation, A handle-side bevel gear rotates around a rotation axis coaxial with the rotation axis of the handle as the handle rotates, The bracket supporting the handle-side bevel gear, A piston-side bevel gear is positioned to mesh with the handle-side bevel gear, and rotates around an axis of rotation perpendicular to the axis of rotation of the handle-side bevel gear as the handle-side bevel gear rotates. A spindle is connected to both the piston and the piston-side bevel gear, and rotates around the axis while moving linearly in the axial direction of the piston as the piston-side bevel gear rotates. A hot and cold water drain valve according to claim 2, having the following features.

4. The gland further comprises the operating section and the valve body, and has an axial hole through which the spindle passes. The spindle is supported by the bracket at the end opposite to the end connected to the piston, and is further supported by the shaft hole between the end supported by the bracket and the end connected to the piston. The hot and cold water drain valve according to claim 3.

5. The valve body is provided with a plurality of holes corresponding to the inlet joint, outlet joint, drain joint, hot water receiving joint, and hot water discharge joint, each spaced evenly along the circumference. A hot and cold water drain valve according to any one of claims 1 to 4.

6. The valve body is further provided with a mounting portion for a fixing device for horizontal installation. A hot and cold water drain valve according to any one of claims 1 to 4.

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