JPH0143575Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a globe-shaped on-off valve for a fire hydrant, and particularly to a globe-shaped on-off valve in which the inner diameter of the opening is increased and the flow rate is increased without increasing the overall size of the valve box. In general, in a globe valve, the center axis of the valve stem extending in the vertical direction intersects the center axis of the inlet opening and the center axis of the discharge opening extending in the horizontal direction at right angles, and The central axis of the opening and the central axis of the discharge opening are aligned on the same line. Further, the central portion of the body seat (valve seat portion) is generally located on this same line. By the way, according to the Fire and Disaster Management Agency's recently established standards based on the Fire Service Act, a fire hydrant with a 180° ball-shaped opening/closing valve is 65A-7.
It was determined that the equivalent pipe length must be 24 or less under the condition of Kg/cm ² -630/min. This is thought to be to prevent the tendency for resistance to increase because globe-shaped on-off valves for fire hydrants are generally accommodated in extremely limited spaces within buildings. However, in the above-mentioned conventional globe-shaped shut-off valve, in order to satisfy the above-mentioned conditions, the overall size of the valve body must be increased, and the required space cannot be avoided. The purpose of the present invention is to solve the problems of conventional globe-shaped on-off valves by increasing the inner diameter without increasing the overall size, lowering the resistance, and reducing the equivalent pipe length. The purpose is to provide an on-off valve. The above-mentioned object of the present invention is that the central axis of the inflow opening and the central axis of the discharge opening are offset on the central axis of the valve stem, and the central axis of the inflow opening is located below the valve seat. , the central axis of the discharge opening is located above the valve seat,
This is achieved by means of a globe valve in which the amount of offset is less than one-half the inside diameter of the inlet opening plus one-half the inside diameter of the discharge opening. In other words, this offset arrangement creates extra space within the valve box, making it possible to increase the inner diameter of the valve box. As a result, the resistance decreased and the flow rate increased, making it possible to keep the equivalent pipe length small. Embodiments will be described below with reference to embodiments shown in the accompanying drawings. In the illustrated globe-shaped on-off valve 10, a central axis 14 of a valve stem 12 extending vertically intersects a central axis 18 of an inflow opening 16 and a central axis 22 of a discharge opening 20 extending horizontally at right angles. This is a type of ball-shaped on-off valve for a fire hydrant, and based on the present invention, the central axis 18 of the inflow opening 16 and the central axis 22 of the discharge opening 20 are vertically offset on the central axis 14 of the valve stem 12. The central axis 18 of the inlet opening is located below the valve seat portion 24, and the central axis 22 of the discharge opening is located above the valve seat portion 24. The amount of this offset, ie, the vertical distance between the central axis 18 and the central axis 22, is less than one-half the inside diameter of the inlet opening 16 plus one-half the inside diameter of the discharge opening 20. It's getting smaller. Due to this offset arrangement, the inner diameters R and S of the valve body are larger than those of conventional globe-shaped shut-off valves. This globe-shaped on-off valve was tested by the Japan Fire Certification Certification Association based on a contract dated June 16, 1980, and the results are shown in the table below. However, the weather that day was cloudy, with a temperature of 21-20°C and humidity of 82-81%.For comparison, we also conducted tests on 90° and 45° angle valves.

[Table] As shown in the test results above, according to the globe-shaped on-off valve of the present invention, the average value of the equivalent pipe length is 16.13,
It was found that it satisfies the standards of the Fire and Disaster Management Agency. As explained in detail above, according to the present invention, it is possible to increase the internal diameter of the globe-shaped on-off valve, lower the resistance, and keep the value of the equivalent pipe length small, without increasing the overall size of the globe-shaped on-off valve. There are some notable ones.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view of a globe-shaped on-off valve according to the present invention. 10...Global opening/closing valve, 12...Valve stem, 1
4, 18, 22... Central axis, 16... Inflow opening, 20... Discharge opening, 24... Valve seat portion.

Claims (1)

[Claims for Utility Model Registration] A ball for a fire hydrant of the type in which the central axis of the valve stem extending in the vertical direction intersects the central axis of the inflow opening and the central axis of the discharge opening extending in the horizontal direction at right angles, respectively. In the valve, the central axis of the inflow opening and the central axis of the discharge opening are offset on the central axis of the valve stem, and the central axis of the inflow opening is located below the valve seat. , the central axis of the discharge opening is located above the valve seat, and the amount of offset is less than one-half of the inner diameter of the inlet opening plus one-half of the inner diameter of the discharge opening. A fire hydrant ball-shaped on-off valve that is characterized by its rounded shape.