JPH0242932Y2 - - Google Patents

Description

[Detailed explanation of the idea] B Industrial application field The present invention relates to a diaphragm valve.

B. Conventional technology Conventionally, in diaphragm valves, welding the valve stem and diaphragm has been more reliable, but when the diaphragm has multiple layers, welding is difficult, and the diaphragm cannot be stacked without changing the shape of each layer. It was hot.

C. Problems to be Solved by the Invention The present invention solves the conventional drawbacks, and provides a diaphragm valve in which diaphragms can be easily stacked and diaphragms of the same shape can be used when stacking diaphragms. The purpose is to

D. Means for Solving the Problems In order to solve the above problems, the present invention uses a plurality of diaphragms stacked on top of each other in a diaphragm valve, and spot-welds the center of the lowest diaphragm to a disk holder. The central portion of the reinforcing diaphragm, which is placed on top of the lowermost diaphragm, is sandwiched between the welded portion and the diaphragm retainer.

E. Function With the above-described configuration, the reinforcing diaphragm can be installed simply by clamping it between the diaphragm retainers (diaphragm receivers). Furthermore, since a plurality of diaphragms are stacked, they can be of the same shape.

F. Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a diaphragm valve according to an embodiment of the present invention. In the figure, 1 is a body, 1a is an inlet, and 1b is an outlet. Further, 2 is a disk attached to the disk holder 3 and opens and closes the valve seat 1c;
is a diaphragm flange, 5 is a bonnet, 6 is a bonnet nut that is screwed onto the upper part of the body 1 to fix the diaphragm flange 4 and the bonnet 5, 7 is a diaphragm retainer, 8 is a diaphragm made of multiple layers, 9 is the following: Stopper part 1
Diaphragm retainer 7 provided at the bottom of 1
10 screws for screwing on the disk holder 3
11 is a stem (valve stem), 11 is a stopper part provided at the bottom of the valve stem and has a diaphragm retainer 7 at the bottom, 11a is an O-ring, and 12 is a part into which the stem (valve stem) 10 is inserted and screwed into the inside of the bonnet 5. 13 is a bearing disposed between the lower end of the sleeve 2 and the valve stem 10, 14 is a lock nut for attaching the valve device, and 15 is a handwheel fixed to the upper end of the sleeve 12 with a screw 16. .

17 is a thrust ring fixed to the upper end of the valve stem 10 with a screw 18 and disposed in the upper recess 19 of the sleeve 12; 20 is a thrust washer;
Reference numeral 1 designates an opening display plate, 25 an opaque cover having a window portion 27 and an indicator portion for an opening scale, and 29 a transparent cover.

The present invention relates to the structure of a diaphragm disposed portion of a diaphragm valve, for example, as shown in FIG. , the peripheral edge portion is disposed between the body 1 and the diaphragm flange 4. Second
The figure shows the details of assembly, and the center part of the lowermost diaphragm 8a is spot welded to the annular protrusion 2a provided on the upper part of the disk holder 2. In this welding, for example, the entire circumference of the annular convex portion 2a is welded. 8b and 8c are reinforcing diaphragms having the same shape as the lowest layer diaphragm 8a, and these reinforcing diaphragms 8b and 8c are stacked on the lowest layer diaphragm 8a. Then, by inserting the screw 9 provided at the bottom of the stem 10 into the through hole 7a of the diaphragm retainer 7 and screwing it into the screw hole 2b drilled at the top of the disk holder 2, the center of the reinforcing diaphragms 8b, 8c is inserted. The diaphragm retainer 7 is clamped and clamped between the welded portion 2c on the disk holder 2 and the diaphragm retainer 7. The peripheral edges of the diaphragms 8a, 8b, and 8c are sandwiched between the body 1 and the diaphragm flange 4 in an overlapping state via a gasket, or welded by arc welding.

Note that the diaphragm valve in the present invention is not limited to the one shown in FIG. 1, and it goes without saying that diaphragm valves of other structures may be used.

Effects of the invention As stated above, in this invention, only the lowest layer diaphragm is spot welded at the center, and the reinforcing diaphragm layered on top is simply held between diaphragm receivers (disc holders, diaphragm retainers). The number of layers can be easily increased and assembly becomes extremely simple. Further, since the diaphragms are simply stacked, the shapes of the diaphragms used may be the same, and parts management becomes easy.

Furthermore, since the valve stem and the valve body can be integrated, a spring mechanism for lifting the valve stem can be eliminated, and the structure can be simplified.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of a diaphragm valve according to an embodiment of the present invention, and FIG. 2 is an explanatory view of the main parts. 1 - body, 2 - disk holder, 2c - welding part, 4 - diaphragm flange, 7 - diaphragm retainer, 8, 8a, 8b, 8c - diaphragm.

Claims (1)

[Scope of utility model registration request] In a diaphragm valve, multiple diaphragms are stacked and used, and the center of the diaphragm in the lowest layer is spot welded to the disk holder, and the center of the reinforcing diaphragm stacked on top of the bottom diaphragm is connected to the welded part. A diaphragm valve characterized by being sandwiched between diaphragm retainers.