JP2512800Y2 - Pressure reducing valve for cold regions - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure reducing valve for cold regions, particularly for low tanks in high pressure areas.

Conventionally, if a low water tank for flush toilets used in high-pressure areas produces a large amount of water supply noise, noise from a water hammer, or sliding, or if the packing of the ball tap in the low tank wears even slightly, the buoyancy of the float cannot stop the water flow. , There was always an overflow.
To prevent this, a pressure reducing valve may be provided in the water supply pipe, but the conventional pressure reducing valve is not suitable for cold regions as much water remains in the valve box when draining water. It was too expensive, and due to its function, it was not easy to repair and replace the packing, and if the valve seat surface was damaged, the pressure reducing valve itself had to be replaced.

The present invention has been proposed in order to eliminate the above-mentioned drawbacks, and it has a function as a pressure reducing valve completely, and at the same time, the packing and the valve seat can be easily replaced, and there is little water remaining in the valve box. It is an object of the present invention to provide a low tank pressure reducing valve most suitable for the ground.

 An embodiment of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 is a valve box, a valve box lower part 1'having an inflow port 2 provided at the lower end, a cylinder 3 above it, a side wall flow path 4 provided on the side wall of the cylinder 3, and an outflow port 5 at the upper end. With the valve box upper part 1 "and the valve boxes 1'and 1" with the packing 6 interposed therebetween and the valve seat body 8 having the upward valve seat surface 7 on the same axis. It will be arranged in. The valve box 1 contains an annular packing 9 that slides on the cylinder 3 and a piston 11 that mounts a flat packing 10 that closes the valve seat surface 7. piston
11 is a spring having a recess 12 formed in the bottom and housed in the recess 12.
An upward force is constantly applied by 13 and a pressure reducing function is provided by the downward force by the secondary pressure in the pressure chamber 14 formed in the valve box upper portion 1 ″.
In order to allow the secondary pressure to escape to the primary side when the secondary pressure therein becomes higher than the primary pressure on the inlet 2 side, a one-way sealing packing 15 is provided and a communication hole 16 is provided. Incidentally, 17 is a stopper when the piston 11 is raised, and 18 is an atmosphere opening hole.

 Next, the operation mode of the present invention will be described.

The figure shows a vertical sectional view of the present invention in which water is supplied to a low tank. High-pressure primary water from the inlet 2 passes through the side wall flow path 4, passes through the gap between the valve seat surface 7 and the flat packing 10, and is of low pressure. It becomes secondary water, flows into the pressure chamber 14, and is supplied from the downstream pipe to the low tank. The secondary pressure in the pressure chamber 14 increases as the water level in the low tank rises and the ball tap is closed.
Compresses and descends while decreasing the flow rate. In the state where the ball tap is completely closed, the secondary pressure becomes maximum, the flat packing 10 comes into close contact with the valve seat surface 7 to shut off the water on the primary side, and the piston 11 also stops descending and becomes a water stop state. Set the spring 13 beforehand so that the secondary pressure at that time becomes the set pressure.
You just have to decide the strength. At this time, since the cylinder 3 and the upper end of the valve seat surface 7, that is, the portion where the flat packing 10 abuts are formed to have the same diameter, the secondary pressure does not significantly change even if the primary pressure changes. It completely satisfies the function as a pressure reducing valve. However, because of that, the valve seat body 8
The inner peripheral wall of No. 3 was smaller than the cylinder 3, and in a normal pressure reducing valve, the piston could not be taken out from the valve box without disassembling the piston, which made repairing the packing and the like extremely difficult. Further, when the valve seat was damaged, the pressure reducing valve itself had to be replaced. However, in the present invention, if the valve box upper part 1 ″ is removed from the valve box lower part 1 ′, the valve seat together with the piston 11 is seated. Since the main body 8 also comes out, the flat packing 10, the annular packing 9, and the valve seat main body 8 can be easily replaced.
By this function, the water on the primary side does not enter the secondary side through the communication hole 16, but if the water is drained by the antifreeze water tap provided in the primary side pipe from this state, The inside of the pipe becomes atmospheric pressure, and thus the secondary pressure on the outlet 5 side becomes higher than that on the inlet 2 side, and the secondary pressure escapes to the primary side by squeezing the one-way sealing packing. The pressure in the secondary side pipe decreases, and the spring 13 raises it until the upper end of the piston 11 contacts the stopper 17,
If the passage between the inflow port 2 and the outflow port 3 is opened and an intake valve is provided in the secondary pipe, water can be automatically drained. Therefore, there is an advantage that it is not necessary to operate the low tank for draining water unlike the case where a conventional pressure reducing valve is attached. This means draining only the water in the pipe,
This is convenient when you want to leave water in the low tank for night use. Further, since the lower cylinder 3 of the piston 11 is provided with the atmosphere opening hole 18, the vertical movement of the piston 11 is not hindered, and the operation is smoothly performed.

As described above, in the present invention, not only the packing of the piston but also the valve seat can be easily replaced, and the inlet, the outlet, and the valve seat surface are arranged on the same axis, so that they can be attached to vertical pipes. If there is no water remaining in the valve box, it is therefore possible to provide a pressure reducing valve that is optimal for cold regions and has a simple structure.

It is needless to say that the pressure reducing valve of the present invention can be used not only for low tank water supply but also as a pressure reducing valve for general household piping.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a water supply state of the present invention. 1 ... Valve box, 1 '... Valve box lower part, 1 "... Valve box upper part, 2
…… Inlet, 3 …… Cylinder, 4 …… Sidewall flow path, 5 ……
Outlet port, 6 ... packing, 7 ... valve seat surface, 8 ... valve seat body, 9 ... annular packing, 10 ... flat packing, 11 ... piston, 12 ... recess, 13 ... spring, 14 ...... Pressure chamber, 15 ...
… One-way sealing packing, 16 …… Communication hole, 17 …… Stopper, 18 …… Atmosphere opening hole

Claims (1)

(57) [Scope of utility model registration request] 1. A cylinder whose bottom is closed at its lower end and whose bottom is closed so as not to communicate with the inflow port at its upper part, and a side wall flow path which opens from the upper part of said inflow port to the upper part of the cylinder at its side is at the bottom of the valve box. The upper part of the valve box, which has an outflow port at the upper end, can be removed from the lower part of this valve box through the valve seat body, which has an upwardly facing valve seat surface with the cylinder inner diameter and its upper end being approximately the same diameter. A piston, which is connected to form a valve box, and in which the one annular packing that is in close contact with the cylinder and the flat packing that is pressed against the valve seat surface are mounted, is accommodated in the recessed portion of the piston bottom, It can be moved up and down by a spring that gives upward pressure to the piston and downward water pressure that acts on the piston.The inlet, outlet, valve seat body, piston and spring are arranged on the same axis. A pressure reducing valve for cold regions.