JPH0557532U - Gate valve - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To improve the sluice valve used for the conduit of running water mixed with foreign matter such as earth and sand. [Structure] The bottoms of the inlet 11 and the outlet 12 of the valve box 1 coincide with the bottoms of the pipes to be connected. The bottom surface of the valve box becomes inclined bottom surfaces 13 and 14 that gradually rises from both ends toward the inside, and is highest at the pressing portion 15 that meets the tip of the valve body 2.
The bottom of the running water is squeezed as it goes through the valve box, the flow velocity increases near the bottom, and it becomes the highest speed at the pressing part. The foreign matter to be deposited is caused to flow at this high flow rate, and the pressing portion always maintains the original surface. [Effect] The valve body is always reliably pressed at the pressing portion to continue normal valve opening and closing.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a sluice valve which is installed in a pipe line to open and close the pipe line by moving a valve body up and down in a valve box.

[0002]

[Prior Art]

 A typical conventional example (JIS-B-2062) of a sluice valve used in a water pipe is shown in FIGS. The valve box 1a has an inlet 11a on one side and an outlet 12a on the other side, and a concave portion 101 is provided at the center, and a position where the concave portion and the bottom surface 103 intersect is a valve seat 102. A valve rod 23a is vertically attached to the valve box from above, and a valve body 2a is screwed to the tip of the valve rod 23a. When the male screw 24a engraved on the valve rod 23a is rotated by the rotation of the upper cap 26a, the female screw 25a of the screwed valve body is engaged so that it cannot rotate. It moves up and down, and the valve body also moves up and down accordingly to open and close the valve.

If the tap water is normal clean water, the sluice valve will not cause any problems, but when it contains earth and sand or foreign matter such as sewage or agricultural water, it bends in the center of the valve box. These foreign matters are concentratedly deposited on the depressed concave portion 101, and sometimes the foreign matters and earth and sand are filled in the concave portion, and even if the valve body 2a descends, the tip end rides up and the valve does not close completely. Japanese Utility Model Laid-Open No. 58-13366 shown in FIGS. 3, A and B is a soft-seal sluice valve proposed to solve this problem, and is a valve box having an inlet and an outlet having the same shape as the diameter of the pipeline. The bottom surface 104 of 1b is formed to have the same level, and the conventional recess is eliminated. That is, the front end of the valve element 2b forms a pressing portion 15b directly with the bottom surface of the valve box to try to eliminate the trouble caused by the mixture of foreign matter.

[0004]

[Problems to be solved by the device]

 By developing the soft-seal sluice valve in Fig. 3, the problem of concentrated foreign matter and sediment accumulating in the recess 101 as in Fig. 2 was solved, but the valve body descends and directly contacts the bottom of the valve box. The composition provokes new challenges. That is, the bottom surface of the valve box is at the same height as the bottom surface of the pipeline, and the same horizontal flow path as the pipeline is formed in the valve box, so foreign matter such as earth and sand is evenly distributed to the bottom surface of the valve box. Since it is easy to deposit and the pressing part is no exception, there is a risk that the valve will not close completely due to the deposition of foreign matter. In addition, it is possible that a large amount of foreign matter mixed in will stop just in the vicinity of the press contact part while flowing through the valve box. At this time, the valve function is greatly reduced and the function of controlling the pipeline is reduced. Will be lost.

In order to solve the problems described above, the present invention aims to provide a sluice valve for preventing deterioration of valve function by interposing it in a pipeline such as sewage mixed with earth and sand, foreign substances, and agricultural water. And

[0006]

[Means for Solving the Problems]

 In the sluice valve according to the present invention, the bottom surfaces of the inlet and the outlet opening at both ends of the valve box are aligned with the bottom surface of the conduit, and the sloping bottom surface that gradually rises from both ends toward the inside of the valve box is formed, and The above-mentioned problem has been solved by the structure in which the pressing surface of (1) has the highest top surface. In addition, it is particularly effective that the ascending height of the top surface corresponds to about 10% of the valve box diameter.

[0007]

[Action]

 In the sluice valve according to the present invention, among the valve boxes inserted in the conduit, only the bottom surface has an inclined bottom surface that rises from both openings toward the center, so the running water flowing from the inlet into the valve box advances. As the flow path is narrowed, the flow velocity is increased due to the strong throttling action especially near the bottom surface. This action is strongest at the pressing portion with the tip of the valve body, and the flow velocity near the pressing portion becomes maximum. Therefore, even if foreign matter such as earth and sand deposits, it is forced to move to other parts near the pressing part and is forced to move to other parts.Therefore, the pressing part is washed by the flow and has the function of always maintaining the original surface. Occurs. From the pressing portion to the outlet, the bottom surface gently descends and the flow velocity also gradually decreases. At the outlet, it returns to the original steady flow and flows into the pipeline. Even when relatively large foreign matter is mixed in the running water, it cannot stay near the pressing part with the largest flow velocity, and it will not settle down to a place with a smaller flow velocity due to the relationship between its own weight and the flow velocity. Needless to say.

There is known a juiced type valve box in which the sealing portion with the valve body is narrower than the diameter of the inlet, but in this case, the entire body is evenly squeezed to improve the economical efficiency. The pressure loss caused by narrowing the path is unavoidable. However, the sluice valve of the present invention is intended specifically to increase the flow velocity near the bottom surface by restricting only the bottom surface of the flow path, and as a whole, it does not have such a large effect that pressure loss becomes a problem.

[0009]

【Example】

 FIGS. 1, A and B are a partial vertical side view (A) and a vertical front view (B) showing an embodiment of the present invention. In the figure, both ends of the valve box 1 of the sluice valve are provided with an inlet 11 and an outlet 12 having the same diameter, and the diameter D thereof is equal to the inner diameter of a pipe (not shown) connected to both ends. The bottom surface of the valve box is formed by slanted bottom surfaces 13 and 14 that gently rise from both ends, and the flow paths other than the bottom surface proceed in a circular shape in cross section, so that the cross section becomes a gradually distorted circular shape, and the valve body 2 descends. The highest top surface is formed in the pressing portion 15 that presses against. If the rising height H of the pressing portion that is higher than both ends due to the inclination is about 10% of the diameter D of the outlet (entrance), the sedimentation action of foreign matter is reliably prevented and the flow passage is narrowed. It has been confirmed in practice that the resulting pressure loss is not so bad that the flow condition is adversely affected, and that the setting is well balanced.

There is a screw top 22 loosely fitted to the fitting portion 21 above the valve body 2 so as not to rotate, and moves up and down together with the valve body. A female screw 25 of a screw hole drilled in the center of the screw thread 22 and a male screw 24 of the valve stem 23 are screwed together, and the valve stem forms a cap 26 protruding above the valve box lid 3. Therefore, when the cap 26 is rotated, the male screw 24 of the valve rod 23 is rotated and the screw top 22 which cannot be rotated is moved up and down, so that the valve body 2 is moved up and down accordingly.

[0011]

[Effect of the device]

 As described above, the sluice valve of the present invention prevents foreign matter such as earth and sand from depositing at the contact portion with the valve body in the valve box, and relatively large foreign matter accidentally stays near the contact portion. Also block. Therefore, there is little concern that the valve will not completely close due to foreign matter even if it is installed in the pipeline that handles running water containing foreign matter, and there is high reliability in maintaining the valve function.

[Brief description of drawings]

FIG. 1 is a vertical side view (A) and a vertical front view (B) of an embodiment of the present invention.

FIG. 2 is a vertical side view (A) and a vertical front view (B) of a conventional technique.

FIG. 3 is a vertical side view (A) and a vertical front view (B) of another conventional technique.

[Explanation of symbols]

 1 valve box 2 valve body 11 inlet 12 outlet 13 inclined bottom surface 14 inclined bottom surface 15 pressing portion D valve box diameter H rising height of pressing portion

Claims (2)

[Scope of utility model registration request] 1. In a sluice valve which is installed in a pipe line and opens and closes the pipe line by vertical movement of a valve element, bottoms of an inlet and an outlet opening at both ends of the valve box coincide with the bottom face of the pipe line, and both ends are inside the valve box. A sluice valve that forms an inclined bottom surface that gradually rises toward the top, and has the highest top surface at the contact portion with the tip of the valve body. 2. The sluice valve according to claim 1, wherein the rising height of the pressing portion corresponds to about 10% of the valve box diameter.