JP2000074243A - Valve structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve structure preventing a valve from being damaged even when water in the valve is frozen to expand the volume, by inserting a tube in the inside of the valve. SOLUTION: A tube 6 is inserted in the inside of outlet/inlet passages 4, 5. Since the tube 6 is formed in a structure generating an internal pressure of certain extent by using a material having elasticity, a rise of pressure in the passage is absorbed by contracting the tube 6 deformed even when water in the outlet/inlet passages 4, 5 of a valve casing 1 is frozen to expand the volume, so as to prevent the outlet/inlet passages 4, 5, that is, a valve from being damaged. An amount of the tube 6 is inserted so as to occupy 10 to 20% an internal capacity of the outlet/inlet passages 4, 5. The tube 6 uses an air tube charged with air of 10 kg/cm2 pressure at 20 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve structure provided in a water distribution pipe or the like.

[0002]

Since the volume of water changes due to the effect of temperature, for example, if the volume of the water expands due to freezing of the water in the valve or an increase in temperature, the pressure in the valve increases due to an increase in the pressure in the valve. Has led to an accident.

[0003]

In the valve structure according to the present invention, the tube inserted into the valve absorbs the rising pressure in the valve, so that even if the water in the valve freezes and the volume expands, The valve does not break.

[0004]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. FIG. 1 is a longitudinal sectional side view showing a valve, in which 1 is a valve casing, 2 is a valve port formed in a valve casing 1, 3 is a valve body that opens and closes a valve port 2, 4, 5
Are the entrance passages respectively formed in the valve casing 1,
Numeral 6 denotes tubes inserted and arranged inside the entrance passages 4 and 5, respectively. In addition, the amount of the tube 6 is the entrance passage 4,
5 so as to occupy 10% to 20% of the internal volume.

The tube 6 has a structure in which a certain amount of internal pressure is generated by using an elastic material. Therefore, for example, even if the water in the inlet / outlet passages 4 and 5 of the valve casing 1 freezes and the volume expands, the tube 6 deforms and contracts, thereby absorbing the rising pressure in this passage.
The entrance passages 4, 5 or the valves are not broken.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As a tube 6, a pressure of 10 k at a temperature of 20 ° C.
An air tube filled with g / cm 2 of air is used. When this air tube is inserted so as to occupy 20% of the volume of the entrance / exit passages 4, 5; When the inside of the entrance / exit passages 4, 5 is pressurized with water (10 kg / cm 2 at a temperature of 20 ° C.) and frozen at 0 ° C. When the pressure rise value changes to ice and the volume increases 1.1 times, the volume of the air tube in the entrance and exit passages 4 and 5 becomes 100-80 × 1.1 = 12% According to the boiling rule, PV Assuming that == constant, the pressure is 0.2 ÷ 0.12 = 1.67 times Since the pressure is previously applied at 10 kg / cm 2, the pressure becomes 1.67 × 10 = 16.7 kg / cm 2.

[0007]

As described above, according to the present invention, the rising pressure in the valve is absorbed by the tube inserted into the valve. Therefore, even if the water in the valve freezes and the volume expands, the valve is not damaged. This has the effect of not being damaged.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve casing 2 Valve port 3 Valve body 4 Inlet side passage 5 Outlet side passage 6 Tube

Claims (2)

[Claims] 1. A valve structure wherein a tube is inserted from a valve port to an inlet / outlet side inside a valve, and the tube absorbs a rising pressure in the valve. 2. The valve structure according to claim 1, wherein the tube is an air tube.