JPH0235178B2 - SHUDOBARUBU - Google Patents

Description

[Detailed Description of the Invention] (a) Field of the Invention This invention involves manually rotating a handle screwed onto the upper part of the valve body to move the valve stem up and down, and using the valve stem to connect the valve portion of the diaphragm to the valve seat. Regarding manual valves that are separated.

(b) Background of the Invention Conventionally, in this type of manual valve, a spring is interposed between a diaphragm having a valve body and a handle, and rotation of the handle pushes the valve body through the valve stem against the spring. It was confirmed that it was closed when the pressure contact force increased by hand-tightening and it became impossible to rotate.

In this case, the force with which the handle is rotated varies depending on the operator, and if the handle is tightened too strongly, it will greatly exceed the required sealing surface pressure, which will not only damage the sealing surface when using a resin valve, but also cause creep. death,
If the seal portion is deformed and further creep occurs, the tightening force will decrease due to stress relaxation, and if it is not tightened further, leakage will occur.

In addition, there was a drawback that leakage occurred if the tightening was weak.

(c) Purpose of the Invention The object of the present invention is to provide a manual valve which restricts the handle from spiraling and seals with a constant pressure when the handle is closed.

(d) Summary of the Invention This invention provides a valve opening spring interposed between a flange provided on a valve stem and a back spring.
A valve-closing spring is interposed between the handle that is screwed into the upper part of the main body and the flange of the valve stem, and a position regulating part is provided between the handle and the main body to prevent the handle from spiraling on the closing side. It is characterized by being a manual valve equipped with.

(E) Effects of the Invention According to this invention, by rotating the handle, the valve closing spring and the valve opening spring are compressed, and the valve portion of the diaphragm is brought into pressure contact with the valve seat by the valve rod, thereby applying surface pressure to the sealing surface. bring about

Further, when the handle is rotated and the handle is screwed forward to the position regulating portion, further rotation is prevented and a fully closed state with a constant pressure is achieved.

Therefore, it can be sealed with a constant surface pressure, and as excessive surface pressure is not applied, there is very little creep.Even if there is some creep, the pressure is always applied with a constant spring force, so the tightening surface pressure is reduced. There is no leakage, which prevents leakage.

(F) Embodiment of the Invention An embodiment of the invention will be described in detail below based on the drawings.

The drawing shows a manual valve. Reference numeral 1 denotes a box-shaped valve body made of fluororesin. Inside the body 1, passages 3 and 4 are provided on the left and right through a central valve seat 2.

A cylindrical upper part 5 made of polyacetal is integrally attached to the above-mentioned main body 1, and a diaphragm 1 made of fluororesin is installed in these internal recesses 1a, 5a.
1 and a metal back-up spring 12 are attached in an overlapping manner.

A stepped portion 6 is formed on the outside of the above-mentioned upper body portion 5 as a position regulating portion for regulating the spiral movement of the handle on the closing side, which will be described later.Furthermore, a stepped portion 6 is formed on the inside for regulating the position of the valve stem flange, which will be described later. 7 is formed.

Valve part 1 provided in the center of the above-mentioned diaphragm 11
3 is opposed to the valve seat 2 described above.

A valve stem 15 is passed through a shaft hole 14 provided in the center of the above-mentioned backup spring 12, and a lower end 16 of the valve stem 15 is opposed to the upper surface of the above-mentioned valve portion 13.

A valve opening spring 18 is interposed in a compressed state between the flange 17 provided on the upper part of the valve stem 15 and the backup spring 12, and the valve opening spring 18 allows the valve stem to open. The flange portion 17 is always pressed toward the above-mentioned step portion 7 side, that is, toward the upper (valve opening) side.

An inner threaded part 20 of a bottomed cylindrical handle 19 made of polyacetal is screwed into the outer threaded part 8 of the upper body part 5, and a pivot shaft 22 is opposed to a pivot bearing 21 provided at the bottom of the handle 19. Then, the valve closing spring 23 is interposed between the pivot shaft 22 and the above-mentioned valve stem flange 17, and the handle 19 is screwed toward the closing side to compress the valve closing spring 23. , with its restoring power, the tsuba part 1
7. The valve portion 13 of the diaphragm 11 is pressed toward the valve seat 2 via the valve stem 15 and its lower end 16.

With the above configuration, when closing the valve, rotate the handle 19 and release the spring 23.
18 is compressed, the valve stem 15 and the valve part 13 are lowered,
It is further turned to close the valve seat 2 with the valve portion 13 and generate surface pressure on the sealing surface.

By turning this handle 19, the upper part of the main body 5
It comes into contact with the stepped portion 6 of the valve and cannot be rotated any further, resulting in a fully closed state.

At this time, the valve portion 13 is tightened by the force of the spring 23, which exceeds the force of the spring 18, and by setting the strength of these two springs, the necessary tightening surface pressure can be obtained in the fully closed state. , can always seal with constant surface pressure.

Furthermore, since no excessive surface pressure is applied, there is little creep, and even if there is some creep, the spring keeps pushing the product, so the tightening surface pressure does not drop and leaks can be prevented.

Further, when opening the valve, the spring 23 is released first, and the spring 18 allows the valve to be opened to a predetermined position.

Furthermore, if the rotational force of the handle 19 is transmitted to the diaphragm 11, it will not only shorten the life of the diaphragm 11, but may also destroy it, but in this example, the rotational force of the handle 19 is converted into vertical movement of the valve stem 15. Since the pivot mechanisms 21 and 22 are used in the parts, no rotational force is applied to the diaphragm 11.

[Brief explanation of drawings]

The drawing is a longitudinal sectional front view of a manual valve showing an embodiment of the present invention. 1...Main body, 2...Valve seat, 5...Upper part, 6...Step part, 1
1...Diaphragm, 12...Backup spring,
13... Valve part, 14... Shaft hole, 15... Valve stem, 16... Lower end part, 17... Flange part, 18... Valve opening spring, 1
9...Handle, 23...Valve closing spring.

Claims (1)

[Scope of Claims] 1. A valve portion provided on a diaphragm is opposed to a valve seat of the main body, and the lower end of the valve rod is inserted through the shaft hole of a back-up spring superimposed on the diaphragm. , a valve-opening spring is interposed between the flange provided on the upper part of the valve stem and the back spring, facing the upper surface of the valve part, and a handle screwed onto the upper part of the main body and the valve; A manual valve, in which a closing spring is interposed between the flange of the rod and a position regulating part for regulating the spiral movement of the handle on the closing side between the handle and the main body.