JPH0435644Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a diaphragm valve, and more particularly to an inexpensive diaphragm valve. Diaphragm valves do not allow the liquid in the flow path to leak to the outside, nor do outside air or oil from the mechanism infiltrate into the flow path, so they are suitable for corrosive liquids, dangerous fluids that easily leak, and maintain high purity. It is used for flow paths for necessary and expensive fluids. The closure of the flow path is shown in the top view of Fig. 4 and the fourth part of Fig. 5.
To explain the conventional diaphragm valve shown in the sectional view taken along the line A-A in the figure and the sectional view taken along the line B-B in FIG. 4 of FIG. The valve body 9 is moved downward in the direction of the arrow 12 by a pressing body (not shown) attached to the
At the upper end of the partition wall (not shown) of the valve case, there is a lower surface 4 of the valve body 9.
This is carried out by pressing a band-shaped protrusion 5 having an appropriately shaped cross section passing over the diameter of . Closing of the flow path due to such operation may occur for a long period of time.
This is repeated many times, and during this time the pressing body attached to the bolt 2 pushes the upper surface 1 of the valve body 9 so that it becomes symmetrical to the band-like protrusion 5 protruding from the lower surface 4 with the valve body 9 in between, that is, as shown in FIG. In other words, it is strongly pressed across the diameter at 11 points. As a result, the parts of the upper surface 1 of the valve body 9 that are strongly pressed by the pressing body attached to the bolts 2 will be damaged over time, so the valve body 9 is formed to be considerably thicker in order to prolong its service life. ing. However, if the valve body 9 is made thicker, the cost of materials increases, ie, the amount of rubber, the number of plies of the reinforcing cloth (in this case, it includes a net-like material, the same applies hereinafter), etc., and the cost increases. When the mounting hole 7 is tightened for fixing to the valve case, the peripheral edge tends to creep, resulting in liquid leakage. A large force is required to move the pressing body attached to the bolt 2 downward in the direction of the arrow 12 in order to close the flow path. The following drawbacks arose. The purpose of the present invention is to eliminate all the drawbacks of the conventional diaphragm valve as described above. A circular shape in which the head of the bolt 2 for attaching to the pressing body is buried in the center of the upper surface 1, as shown in the sectional view taken along line A-A in Figure 3 and the cross-sectional view taken along line B-B in Figure 1 of Figure 3. having a protrusion 3;
In a diaphragm valve, the valve body 9 has a band-shaped protrusion 5 having an appropriately shaped cross section passing along the diameter on the lower surface 4, a mounting hole 7 on the peripheral edge 6, and a reinforcing cloth 8 inside. By providing a diaphragm valve characterized in that a band-like projection 10 is thin and has an appropriate cross section at a location on the upper surface 1 that is symmetrical to a location having the band-like projection 5 with the valve body 9 in between. It was achieved. Here, the reinforcing cloth 8 is made of polyamide fiber cord, polyester fiber cord, or the like. EXAMPLE The above-mentioned FIGS. 1 to 3 are diaphragm valves of the present invention, and FIGS. 4 to 6 are diaphragm valves of comparative examples, and the sizes and configurations of the main parts were as follows. Thickness (mm) of control example valve body 9* ¹ of the present invention 3 9 (excluding band-shaped protrusion 5) Number of plies of reinforcing fabric 8* ^{2 1} 3 Thickness of band-shaped protrusion 5* ³ (mm) 1.5 1 〃 10* ⁴ 〃 2.5 - Width of 10 (mm) 12 - * ¹ : Made of polychloroprene rubber * ² : Fiber cord made of polyester * ³ : Semicircular in cross section. * ⁴ : The cross section is rectangular. Both of the diaphragm valves are fixed to the valve case through the mounting holes 7 in the peripheral portion 6, and the pressing body is mounted on the belt-like protrusion 10 using the mounting bolts 2 in the case of the diaphragm valve of the present invention, and on the belt-shaped projection 10 of the diaphragm valve of the control example. In this case, it is attached to the part of the upper surface 1 that is in contrast to the band-like projection 5, and in a flow path where dilute hydrochloric acid is flowing, it is moved downward in the direction of the arrow 12 under the following conditions and pressed onto the partition wall to activate this operation. repeated. This invention Comparative example Pressurization time (seconds) 10 10 Pressure removal time (seconds) 10 10 Pressure during pressurization (Kg/cm ² ) 50 50 Both pressurization and pressure removal were repeated 100,000 times, and the following results were obtained. Obtained.

【table】

[Table] In this invention, since the valve body 9 is made thinner,
Less rubber, reinforcing cloth 8, etc. are required, and costs can be reduced, and as a secondary high cost caused by this,
The process can be streamlined by reducing the number of parts, further promoting cost reduction, and reducing creep while fixing to the valve casing through the mounting hole 7.
Liquid leakage is less likely to occur, and in order to close the flow path, a large force is not required for downward movement in the direction of arrow 12 by the pressing body attached to bolt 2, and a small power source is required. Obtained. Of course, even though the main body of the valve body 9 is thinner, the band-shaped protrusion 10 with an appropriate cross section is provided in the part that is most likely to be damaged when pressed, so the valve body 9 is thicker than conventional diaphragm valves. Needless to say, it was able to maintain a comparable and sufficient service life.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the diaphragm valve of the present invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, Fig. 3 is a cross-sectional view taken along line B-B in Fig. 1, and Fig. 4 is a conventional diaphragm valve. A plan view of the valve, FIG. 5 is a sectional view taken along line A-A in FIG. 4,
FIG. 6 is a sectional view taken along the line B--B in FIG. 4. 1...Top surface 1, 2...Mounting bolt, 3...Circular projection, 4...Bottom surface, 5...Strip-like projection, 6...Periphery, 7...Mounting hole, 8...Reinforcement cloth, 9... valve body,
DESCRIPTION OF SYMBOLS 10... Band-shaped projection, 11... Point symmetrical to the band-shaped projection 5, 12... Downward movement direction.

Claims (1)

[Scope of utility model registration request] In the center of the upper surface 1, there is a circular protrusion 3 in which the head of the bolt 2 for attaching to the pressing body is buried; In a diaphragm valve consisting of a valve body 9 having a mounting hole 7 and a reinforcing cloth 8 inside, the valve body 9 is thin and symmetrical to the area where the band-shaped protrusion 5 is provided, with the valve body 9 sandwiched therebetween. A diaphragm valve characterized in that a band-shaped protrusion 10 with an appropriate cross section is provided at a location on the upper surface 1.