JPS62258269A - Stop valve - Google Patents

Abstract

PURPOSE:To prevent over fastening of handle by feeling the encounter of a valve face with a proper closing contact force in the way of open valve operation. CONSTITUTION:A handle 4 of a stop valve 1 is rotary fastened to drive a screw member 3 so as to close contact a valve face 14 against a valve seat 7a. Here, a spring S for close contacting the valve face 14 against the valve seat 7a with a proper force is arranged in a valve thrust transmission system T between the drive screw member 3 and a valve body 12. With such arrangement, over fastening of handle, loosening of drive screw member due to vibration and leakage of fluid due to the deformation of valve seat or valve face during valve close operation can be prevented.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a stop valve used to shut off the flow of fluid. This technology eliminates fluid leakage due to deformation of the valve seat or valve surface.

<Prior art> Generally, the basic structure of a stop valve is that by tightening and rotating the handle, the propelling screw member is screwed into the valve body.
The thrust force moves the valve body toward the valve closing side, and the valve body is configured to come into closing contact with the valve seat, which is the valve surface.

In the conventional example, for example, Utility Model Application No. 59-189978
As described in the publication, the propulsion spring member presses the valve element, which is biased toward the valve opening side by the valve opening spring, toward the valve closing side via the diaphragm.

<Problems to be Solved by the Invention> By the way, the stop valve of the conventional configuration described above has the following inconveniences when shutting off fluid.

B. The resistance force when tightening the handle during valve closing changes as shown by curve X in Figure 2.

In other words, the resistance force is generated by the deformation force of the valve opening spring and the V gear 7 ram while the valve surface progresses from the fully open position A to the position ffB where it contacts the valve seat, and the resistance force is generated by the deformation force of the valve opening spring and the V gear 7 ram, and the resistance force is a small value and a supportive angle. rises with After passing the valve seat abutting position B, the deforming force of the valve surface is also applied, and the valve rapidly moves upward, and then rises linearly at a steep angle.

In this case, the appropriate closing abutment force P of the valve surface is in the middle of a steep linear rise region. For this reason, when the operator turns the handle while feeling the handle, he or she must adjust the appropriate closing contact force P.
It is not possible to accurately sense whether or not the target has been reached.

As a result, people often overtighten the valve for fear of leakage if it is not tightened enough, and the closing contact force on the valve surface becomes abnormally large, causing early damage to the valve seat or valve surface. It's gone.

The propulsion screw member may begin to loosen due to vibration while the valve is closed.

If it starts to loosen even a little, the valve body is biased toward the valve opening side by the reaction force of the valve seat, so the closing contact force of the valve face rapidly weakens, and this causes frictional fixation of the propelling screw member. The force also weakens rapidly, making it easier for the fluid to loosen and leak.

C. While the valve is closed, plastic deformation of the valve seat or valve surface progresses gradually over time due to the closing contact force.This plastic deformation occurs when the valve seat or valve surface is made of synthetic resin. When the valve is made of material or when the valve closing period is long, the amount of deformation increases, and as a result, the closing contact force of the valve surface decreases.

When the plastic deformation progresses beyond a certain amount, the closing contact force of the valve surface becomes lower than the appropriate value, and fluid leakage occurs.

The present invention aims to make it possible to feel this as a response when the valve surface approaches an appropriate closing contact force during the valve closing operation, and to prevent loosening even if the propulsion screw member is subjected to vibration during the valve closing state. The purpose is to prevent the valve from coming out, and to prevent the closing contact force from decreasing even when the valve seat or valve face undergoes plastic deformation due to the closing contact force during the valve closed state.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention has the above-mentioned basic structure, for example, as shown in FIG.
The valve closing force transmission system T from the propulsion screw member 3 to the valve body 12 is provided with an appropriate valve closing force imparting spring S that brings the valve a into closing contact with an appropriate force. .

<Operation> The operation of the above configuration will be explained based on, for example, FIGS. 1 and 2.

The solid line in FIG. 1 shows the stop valve 1 in an open state. During the closing operation of the stop valve 1, when the handle 4 is rotated and shaken so that the propelling screw member 3 spirals downward with respect to the valve box 2, the lower end of the valve stem 26 first comes into contact with the diaphragm 17. (Indicated by a chain double-dashed line in the figure). Further, as the handle 4 is tightened, the valve body 12 is moved toward the valve seat 7a against the deformation resistance of the diaphragm 17 and the urging force of the valve opening spring 16, and the valve body 12 is moved toward the valve seat 7a. The valve surface 14 is brought into contact (indicated by a two-dot chain line in the figure). When the handle 4 is further operated in this state, the valve surface 14 begins to be elastically deformed, and when the deformation resistance of the valve surface 14 of the shoe reaches a predetermined value or more, the compression of the spring S for applying appropriate valve closing force is started. When this compression is completed, only elastic deformation of the valve surface 14 is allowed.

During the valve closing operation, the resistance force when the handle 4 is retracted changes as shown by the curve Y in FIG. 2.

In other words, from position A where the valve surface is fully open, the spring S that provides appropriate valve closing force
The curve Y changes in the same way as the curve X of the conventional example up to the position C where compression of the curve starts. After this curve Y exceeds the above-mentioned position C, it rises at a gentle angle, and then,
When the valve-closing force imparting spring S exceeds the position where the compression is completed, it rises linearly at a steep angle.

<Example> Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIGS. 1 and 2 show a first embodiment. In FIG. 1, numeral 1 is an angle-type stop valve, and numeral 2 is its valve box. A propelling screw member 3 that is screwed into the valve box 2 is provided, and a handle 4 for operation is provided at the upper end of the propelling screw member 3.
is installed.

The valve box 2 is comprised of a valve box main body 5 that extends in the vertical direction, and a lid member 6 that covers the upper opening of the second valve box main body 5. A cylindrical valve chamber 7 whose axis is vertically oriented is provided in the middle of the valve box body 5 in the vertical direction.

The terminal end of the inlet hole 9 is opened in the center of the bottom wall of the valve chamber 7, and a valve seat 7a is formed along the edge of the opening. Further, the starting end of the outlet hole 10 is opened at the lower part of the peripheral wall of the valve chamber 7.

A cylindrical valve body 12 is fitted into the valve chamber 7 so as to be slidable up and down, and an annular elastic disk 13 made of fluororesin or the like is fitted in the lower part of the valve body 12.

The lower surface of the disk 13 constitutes a valve surface 14, and this valve surface 14 can be pressed against the valve seat 7a via a valve-closing thrust transmission system T provided inside the valve box 2.

This valve-closing thrust transmission system T will be explained below.

A valve opening spring 16 is provided between the lower side of the valve chamber 7 and the upper part of the valve body 12.
is mounted, and the valve body 12 is urged in a direction away from the valve seat 7a via the valve opening spring 16.

A disk-shaped diaphragm 17 is provided which contacts the upper surface of the valve body 12 and partitions the valve chamber 7 in an airtight manner. The annular protrusion 5a supporting this diaphragm 17 is the valve body main body 5.
A diaphragm 17 is press-fixed to this protrusion 5a via the lid member 6.

The lid member 6 includes a press ring 19 placed on the diaphragm 17, a presser foot 20 that fits the press ring 19 on the outside and presses it toward the dial 7 ram 17, and a presser ring 20 that fits the presser ring 19 on the outside and presses it toward the dial 7 ram 17. and an i-bolt 21 that presses this against the diaphragm 17911.

This lid bolt 21 is screwed into the upper inner circumferential surface of the valve box main body 5.

The outer circumferential side of the propelling claw upper member 3 is hinged to the inner circumferential side of the presser foot 20 in the lid member 6, and the handle 4 is fitted into the upper end of the propelling claw upper member 3 so as to be relatively unrotatable. A valve rod 26 is inserted coaxially into the threaded member 3, and the upper end of the valve rod 26 is supported by the upper end of the propulsion threaded member 3 via a nut 28.

Further, a head portion 26a is formed at the lower part of the valve stem 26,
Two pressing pieces are attached to the lower surface side of this head portion 26a. The pressing piece 29 can press the radially central portion of the diaphragm 17 downward.

An annular spring chamber 31 extending in the vertical direction is formed between the propulsion sprung member 3 and the valve stem 26. Within this spring chamber 31, a plurality of disc springs 32 forming the appropriate valve closing force imparting spring S are formed. is installed. The valve stem 26 is biased downward with respect to the propelling screw member 3 by the disc spring 32 .

In the above configuration, when the valve is closed, when the handle 4 is rotated and shaken so that the propulsion screw member 3 spirals downward with respect to the valve box 2, the thrust force causes the propelling screw member 3 to move through the disc spring 32, the valve stem 26, and the diaphragm 17. Then, the valve body 12 is moved to the valve closing side, and the valve surface 14 is brought into contact with the valve seat 7a (as shown by the dashed line in FIG. 1). When the handle 4 is further tightened and rotated, the disc 13 and the disc spring 32 are compressed, and the valve surface 14 is compressed.
is tightened onto the valve seat 7a, thereby closing the valve seat 7a. A curve Y in FIG. 2 shows the resistance force when the handle 4 is tightened.

On the other hand, when closing the valve, contrary to the above, when the handle 4 is rotated so that the propelling screw member 3 spirals upward with respect to the valve body 2, the urging force of the valve opening spring 16 causes the valve body 12 to move upwardly.
is moved upward, and the valve seat 7a is opened (shown by a solid line in FIG. 1).

FIG. 3 to FIG. 6 show other embodiments, and explanations will be given of configurations different from the first embodiment.

(Second example) 3 and 4 show a second embodiment.

In the figure vk3, reference numeral 36 is a presser cover formed in the shape of a cap nut, and the cover member 6 is constituted by the presser cover 36 and the press ring 19. That is, a pressing ring 19 that presses the diaphragm 17 against the protrusion 5a is fitted into the upper part of the valve body body 5.
The press ring 19 is pressed downward by the presser cover 36 screwed onto the upper outer periphery of the valve body body 5.

The propulsion screw member 3 is screwed into this presser cover 36.

FIG. 4 shows a partial modification of this second embodiment. In this case, an O-ring 37 is provided in place of the diaphragm that partitions the valve chamber 7 in an airtight manner. That is, a circumferential groove 38 is formed in the upper part of the valve body 12, and an O-ring 37 is installed between the circumferential groove 38 and the circumferential wall of the valve chamber 7.

(Third Embodiment) Figure @5 shows the third embodiment. In this case, the diaphragm 17 is pressed against the protrusion 5a by the lower end of the lid bolt 21 screwed into the upper part of the valve body body 5. Above lid bolt 2
A propelling screw member 3 is screwed onto the propelling screw member 1, and a pressing piece 29 is attached to the lower end of the propelling screw member 3.

On the other hand, a shilling-shaped spring chamber 31 that is open at the top is formed within the valve body 12 . A plurality of disc springs 32 are vertically installed in the spring chamber 31, and a spring presser 41 that presses the second disc spring 32 downward is fitted inside the spring chamber 31. The protruding end of the spring presser 41 passes through the cover plate 42 and comes into contact with the lower surface of the diaphragm 17.

When the diaphragm 17 is moved downward via the pressing piece 29, the spring presser 41 is pressed by the diaphragm 17, and the disc spring 32 is made compressible.

(Fourth Embodiment) FIG. 6 shows a fourth embodiment. In this case, the propelling spring member 3 is screwed onto the valve body body 5, and the protruding end of the head portion 26a of the valve rod 26 is engaged with the upper part of the propelling spring member 3.

Further, a valve body 12 is fitted into the lower part of the propelling screw member 3 so as to be slidable up and down. Reference numeral 13 is a disk. A spring chamber 31 is formed between the propulsion screw member 3 and the valve body 12, and a pair of disc springs 32 constituting a spring S for applying an appropriate valve closing force is attached to this spring chamber 31.

In addition, the code|symbol 45 is an O-ring, and the code|symbol 46 is a scaffold.

<Effects of the Invention> The present invention is constructed and operated as described above and produces the following effects.

B. During the valve closing operation, the resistance force when tightening the handle changes as shown by curve Y in FIG. 2, for example.

J11] The resistance force of the fly increases at a gentle angle from the position C where the compression of the positive-closing valve force imparting spring starts to the position where this compression is completed, but after the position C, it rises steeply. rise at an angle. Then, as the worker turns the handle, the resistance suddenly increases at the above position.
You can feel that the valve surface has reached the appropriate closing contact force P.

Even if the stop valve is subjected to vibrations during the valve-closing state, the propelling screw member can be firmly friction-fixed to the valve box side by the elastic repulsive force of the appropriate valve-closing force imparting spring. Therefore, the propulsion screw member is prevented from loosening, and fluid leakage is prevented.

C. Even if the valve seat or valve surface undergoes plastic deformation due to the closing abutment force during the valve closing state, the elastic repulsion force of the spring that provides appropriate valve closing force will follow the amount of plastic deformation and deform the valve. The surface can be pressed toward the valve closing side. Therefore, the closing contact force of the valve surface is suppressed from becoming lower than the appropriate value, and as a result,
Fluid leakage is more reliably prevented.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, and Figures 1 and 2 are the first embodiment. Figure 1 is a longitudinal sectional view of the stop valve, and Figure 2 shows the resistance force when tightening the handle and the handle A diagram showing the relationship with the rotation angle, FIGS. 3 and 4 are the second embodiment, FIG. 3 is a diagram corresponding to FIG. 1, and FIG. 4 is a partial diagram showing a partial modification of FIG. 3. , FIG. 5 shows the third embodiment and is a diagram corresponding to FIG. 1,
FIG. 6 shows a fourth embodiment and is a diagram corresponding to FIG. 1. DESCRIPTION OF SYMBOLS 1... Stop valve, 2... Valve box, 3... Propulsion screw member, 4... Handle, 7a... Valve seat, 1
2... Valve body, 14... Valve surface, 26... Valve stem,
31... Spring chamber, 32... Belleville spring, S... Proper valve closing force imparting spring, T... Valve closing thrust transmission system.

Claims (1)

[Claims] 1. By tightening and rotating the handle 4 of the stop valve 1,
In a stop valve configured such that the propulsion screw member 3 is spirally advanced relative to the valve box 2, the thrust moves the valve body 12 toward the valve closing side, and the valve surface 14 is brought into closing contact with the valve seat 7a. Valve surface 1
4 to the valve seat 7a with an appropriate force is interposed in the valve closing thrust transmission system T from the propulsion screw member 3 to the valve body 12. The stop valve 3 according to claim 1, in which the spring S for applying proper valve closing force is a disc spring 32, the valve closing thrust transmission system T is at least the propulsion screw member 3,
It has a valve stem 26 and a valve body 12, and has a propelling screw member 3 and a valve stem 2.
6, a spring chamber 31 is formed in the valve body 12, and a spring chamber 31 is formed in the valve body 12. The stop valve 5 described in claim 1 or 2, in which a spring S for imparting a proper valve closing force is inserted, the valve body 12 is fitted into the propelling screw member 3, and the propelling screw member 3 and the valve body 12 are connected together. A stop valve according to claim 1 or 2, wherein a spring chamber 31 is formed between the spring chamber 31 and a spring S for applying an appropriate valve closing force is inserted into the spring chamber 31.