JPH0223652Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an antifreeze faucet having a pressure reducing mechanism used in cold regions.

(Prior Art) Conventionally, in cold regions, it has been common practice to use antifreeze water faucets to drain water in pipes into the ground to prevent freezing. The so-called piston, which is easy to operate and can be expected to produce a large flow rate, as in Utility Model Publication No. 45-20618 by humans,
Cylinder-type antifreeze faucets are increasingly being used. However, since a large flow rate is obtained, in some areas, especially in high-pressure areas, when opening the faucet, one has to be careful about water splashing, and when the faucet is closed, there is a vibration noise caused by water hammer. Problems such as damage to piping joints also arise.

Therefore, as shown in Figure 2, it may be possible to use a pressure reducing valve for cold regions in the middle of the piping, such as the one disclosed in Utility Model Application Publication No. 55-13815, for the purpose of reducing the pressure in water heaters. It is very difficult to do so, and you have to consider accidents such as forgetting to drain the water and causing it to freeze, resulting in no water coming out or damage to plumbing fixtures.Also, the cost increases accordingly, so it is not often used. It is said that the faucet is not used, and in reality, when closing the faucet, people are careful to close it slowly to avoid water hammer, or they operate the faucet while putting up with some inconvenience and inconvenience. That was the current situation.

(Problems to be solved by the invention) In view of the above points, the present invention aims to provide a completely new device that eliminates all of the above-mentioned defects by providing the antifreeze faucet itself with a decompression function. The purpose is

(Means for Solving the Problem) Therefore, the present invention has an inlet in the upper part of the valve box, an inlet in the middle part below, and a piston-like valve body that reciprocates within the cylinder of the valve box, and a piston joint at the upper end. The piston is movably connected to its lower part and is divided into two parts: an inlet, an outlet, and a piston that opens and closes the drain, and a secondary pressure chamber surrounded by a cylinder is formed between the two. A downward force is applied to the piston, and on the other hand, a rising force is applied to the piston by a spring, and the downward force due to the secondary pressure and the upward force due to the spring provide a pressure reducing function, and when draining water, the piston joint is lowered, and the piston joint A ring-shaped gasket attached to a piston connected to the piston is removed from the cylinder to drain water in the secondary piping.

(Function) As mentioned above, in this invention, while having the conventional function as an antifreeze faucet, the piston connected to the piston joint can also move up and down due to the downward force of the secondary pressure and the upward force of the spring. Since we can provide an unprecedented device that exhibits a pressure reducing function, there is no need to install a separate pressure reducing valve in the pipe, which saves costs, eliminates the need for troublesome water draining, and allows you to operate the faucet with confidence even in high pressure areas. It is possible to obtain an appropriate amount of water.

(Example) Next, the present invention will be explained based on an example shown in the drawings.

In FIG. 1, a valve box 1 has an inlet 2, an outlet 3, and a drain 4 on the side in order from the top.
A second cylinder 6 is provided between the outflow port 3 and the outflow port 3, and a third cylinder 7 is provided between the outflow port 3 and the drain port 4. piston 8
are three ring-shaped gaskets 9, 10, 11 that respectively slide the first to third cylinders on the outside.
is installed, a narrow diameter part 12 is formed above, and the narrow diameter part 1
A threaded portion 13 is provided at the tip of 2. A communication hole 14 opening at the upper and lower ends along the central axis is provided inside, the lower part of the communication hole 14 is expanded to accommodate a ball valve 15, and a valve seat 16 on which the ball valve 15 abuts is formed. Further, a roll pin 17 is inserted to prevent the ball valve 15 from falling off downward. A piston joint 20 in which ring-shaped gaskets 18 and 19 are mounted above the piston 8 in close contact with the first cylinder 5 and the narrow diameter portion 12.
, and attach the threaded part 1 to the spring 21 housed inside.
The adjusting nut 22 screwed into the piston 3 is locked, and the piston 8 constantly receives an upward force, and the piston 8 is connected to the piston joint 20 so that it can freely move up and down. piston joint 20
A pressure chamber 23 of secondary pressure surrounded by the first cylinder 5 is formed between the piston 8 and the piston 8, and the communication hole 1 is formed inside the piston in order to introduce the secondary pressure into the pressure chamber 23.
Separately from the piston 4, an introduction hole 24 is provided which communicates the outlet 3 and the pressure chamber 23 to apply a downward force to the piston 8. Although not shown, the valve box 1 is connected to the upper operating section main body through a pipe 25, and the piston joint 20 is connected to an operating rod such as a spindle through a rod 26, so that it can be moved up and down within the pipe 25 by rotation of the handle. ing. Furthermore, a piston lower end chamber 27 having a slightly larger diameter than the third cylinder 7 is formed at the lower end of the piston 8, and a drain port 4 is formed at the lower end of the piston 8.
communicate with.

The figure shows a state in which water is being dispensed using a faucet (not shown) installed at the end of the secondary piping on the downstream side of the outflow port 3, that is, water is flowing. The water is depressurized through the gap between the upper end of the second cylinder 6 and the lower part of the ring-shaped packing 10 of the piston 8, becomes secondary water with a lower pressure than the primary water, flows into the downstream piping from the outlet 3, and is fed to the faucet. Water is being sprayed from. The secondary water on the outflow port 3 side enters the pressure chamber 23 from the introduction hole 24, and applies a downward force to the piston 8 with the water pressure of the area difference based on the diameter difference between the ring-shaped packings 9 and 19, that is, the secondary pressure. However, when the faucet is further opened from this state, the secondary pressure decreases, so the downward force on the piston 8 decreases, and the piston 8 rises under pressure from the spring 21.
Increase flow rate. On the other hand, when the faucet is closed, the secondary pressure increases, compressing the spring 21 and pushing the piston 8.
falls, decreasing the flow rate. When the faucet is completely closed, that is, when the water is stopped, the secondary pressure is at its maximum, and the ring-shaped gasket 10 is in contact with the second cylinder 6.
The inlet 2 is in close contact with the ring-shaped gasket 9.
Cut off primary water from the The strength of the spring 21 may be adjusted in advance using the adjustment nut 22 so that the secondary pressure at this time becomes the set pressure. If the adjustment nut 22 is lowered, the set secondary pressure increases, and if it is raised, it decreases. That is, in the pressure reducing valve according to the present invention, since the piston lower end chamber 27 is opened to the atmosphere through the communication hole 14, a descending force due to the secondary pressure that enters the pressure chamber 23 and is applied to the piston 8;
The piston 8 is moved up and down by the rising force of the spring 21, and the opening degree of the piston 8 with respect to the second cylinder 6 is automatically adjusted to maintain the secondary pressure at a constant set pressure. When the water is stopped, the ring-shaped packings 9, 10, and 11 are in close contact with the first to third cylinders 5, 6, and 7, respectively, but since each cylinder has the same diameter, the ring-shaped packings 9, Equal water pressures act on pistons 10 in opposite directions, so even if the primary pressure fluctuates, no upward force or downward force acts on the piston 8, and the secondary pressure does not fluctuate. In other words, it completely functions as a pressure reducing valve.

Next, when you want to drain the water in the secondary side piping from the water flow state shown in the figure, by operating the handle, lower the piston joint 20 connected to the handle via an operating rod such as a spindle and a rod 26, and the spring 2
The upward force exerted by the piston 1 on the piston 8 decreases, and the piston 8 also descends due to pressure from the piston joint.
The ring-shaped gasket 11 comes into close contact with the cylinder to block the primary water from the inlet 2, and then descends further to separate the ring-shaped packing 11 from the third cylinder 7, and the water in the secondary pipe is discharged into the ground from the drain 4. Ru. In other words, it becomes a draining state.
During drainage, some water tries to rise into the communication hole 14, but the water does not rise into the pipe 25 because the ball valve 15 immediately rises due to the water flow and closes the valve seat 16. Although not shown, a check valve is provided at the tip of the drain port 4 to prevent external sewage from entering the valve box 1. When the piston 8 descends, the ball valve 15 closes the valve seat 16, and the lower end of the piston Since the chamber 27 is communicated with the atmosphere inside the pipe 25 and rises, the lower end chamber 27 of the piston does not become a negative pressure, and even if the check valve does not operate completely,
Sewage from underground is not sucked into the valve box.

(Effects of the invention) As described above, with this invention, it has become possible to provide the antifreeze faucet itself with a pressure reducing function, so even in high-pressure areas, a separate pressure reducing valve or throttle valve can be installed in the middle of the piping. Accidents caused by water hammer, wastage of water, and inconvenience when operating a faucet can be solved without making a profit, and an appropriate amount of water can be obtained and the water draining operation can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an embodiment of the present invention in a state where water is flowing, and FIG. 2 is an example of conventional piping. 1 is a valve box, 2 is an inlet, 3 is an outlet, 4 is a drain, 5 is a first cylinder, 6 is a second cylinder, 7 is a third cylinder, 8 is a piston, 9, 10, 11,
18 and 19 are ring-shaped gaskets, 14 is a communication hole,
20 is a piston joint, 21 is a spring, 23 is a pressure chamber, 24 is an introduction hole, 25 is a pipe, and 26 is a rod.

Claims (1)

[Scope of utility model registration request] In an antifreeze faucet in which a piston-shaped valve body connected to a rod moves up and down inside a cylindrical valve box connected to a pipe to shut off water and drain water, the valve box has a number of valves arranged inside it in order from the top. 1 to 3 cylinders are provided, and on the side, an inlet is provided between the first cylinder and the second cylinder, an outlet is provided between the second cylinder and the third cylinder, and a drain port is provided below the third cylinder,
The piston-shaped valve body includes a piston joint equipped with a ring-shaped packing that tightly contacts the first cylinder, a ring-shaped packing that is vertically movably connected to the lower end of the piston coupling and that tightly contacts the first cylinder, and a ring-shaped packing that is attached to the first cylinder. A ring-shaped packing is attached to the second and third cylinders, and the piston is always subjected to an upward force by a spring. A pressure chamber surrounded by one cylinder is formed, and the piston is further provided with a communication hole extending from the drain port to the piston joint and an introduction hole extending from the outlet to the pressure chamber. Type antifreeze faucet.