JP2572210Y2 - Ball valve with built-in check valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball valve mounted on a fluid pipe to open and close a fluid passage, and more particularly to a ball valve having a non-return function for permitting a forward flow of a fluid but stopping a reverse flow. .

[0002]

2. Description of the Related Art A conventional ball valve having a check function is disclosed, for example, in Japanese Utility Model Laid-Open No. 1-58869. This is a ball valve in which a fluid passage is opened and closed by rotating a ball having a through hole disposed in a valve casing, and a check valve is disposed in the through hole of the ball. And
The check valve includes a check valve body that opens and closes the through hole, a spring receiver fixed to the through hole, and a spring disposed between the check valve body and the spring receiver to bias the check valve body in the valve closing direction. Consists of

[0003]

In the above prior art, the spring receiver is fixed in the through hole and its position cannot be adjusted. Has the disadvantage that springs having different elastic forces must be incorporated. Accordingly, a technical problem of the present invention is to obtain a ball valve with a built-in check valve having a different valve opening pressure by using a single spring.

[0004]

The technical means of the present invention taken to solve the above technical problem is a check valve having a check valve disposed in a through hole of a ball disposed in a valve casing. For a built-in ball valve, the check valve of the check valve is urged in the valve closing direction by a spring disposed between the check valve and a spring receiver. In the valve-closed state, an opening for operating the spring receiver from the outside to advance and retreat the screw is provided at a portion facing the spring receiver of the valve casing, and a plug for closing the opening is detachably attached to the opening. <br/> It is.

[0005]

The operation of the above technical means is as follows.
Since the spring receiver is attached to the through hole so that it can advance and retreat,
The position of the spring receiver can be displaced by moving the spring receiver forward and backward. The elastic force of the spring disposed between the spring receiver and the valve body increases or decreases depending on the position of the spring receiver. The valve opening pressure of the forward flow can be increased by increasing the elastic force of the spring, and the valve opening pressure of the forward flow can be decreased by decreasing the elastic force of the spring.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). The end member 2 is screwed to the main body 1 to form a valve casing. Inlet 3 for valve casing
And an outlet 4 and a valve chamber 5 to form a fluid passage. A ball 7 having a through hole 6 is arranged in the valve chamber 5. Annular valve seats 8 and 9 are arranged on the inlet 3 side and the outlet 4 side of the ball 7.
Reference numerals 10 and 11 are seal members between the annular valve seats 8 and 9 and the valve casing. Parallel key on top of ball 7
A groove 12 is provided, and a key at the lower end of the valve shaft 13 penetrating the main body 1.
Engage the part. The valve shaft 13 is prevented from popping out by a holder 14 screwed to the valve casing. Reference number 15, 1
6 is a seal member between the valve shaft 13 and the holder 14, and 17 is a seal member between the holder 14 and the valve casing.
A handle (not shown) is attached to the valve shaft 13 so that the ball 7 can rotate.

A check valve 18 is disposed in the through hole 6 of the ball 7. The check valve 18 includes a check valve body 19, a spring receiver 20 and a spring 2.
It consists of 1. The check valve body 19 has a disk shape, and opens and closes the through hole 6 by being detached from and seated on a valve seat surface 22 formed on the inlet 3 side of the through hole 6 in FIG. Further, the check valve body 19 has a plurality of protrusions 23 on the outer periphery, which slidably contact the through hole 6. The spring receiver 20 has a plurality of protrusions 24 on the outer periphery and a hole 25 at the center, and a male screw formed on the outer periphery of the protrusion 24 is screwed to a female screw of the through hole 6. The spring support 20 is shown in FIG.
Has a protruding portion on the outlet 4 side, and its outer periphery 26 is formed in, for example, a hexagon so that it can be rotated by a tool or the like. A coil-shaped spring 21 for urging the check valve body 19 against the valve seat surface 22 is disposed between the check valve body 19 and the spring receiver 20.

FIG. 2 is a central longitudinal sectional view of FIG. 1 when the ball 7 of FIG. 1 is rotated by 90 degrees to close the valve. FIG.
An opening 27 is opened at a position facing the spring receiver 20 of the valve casing in FIG.
8 is screwed.

The operation of the above embodiment is as follows. FIG. 1 shows a state in which the ball 7 has opened the fluid passage, and FIG. 2 shows a state in which the ball 7 has closed the fluid passage. In the state shown in FIG. 1, the fluid pressure at the inlet 3 and the fluid pressure at the outlet 4
Is greater than the force, the check valve body 19 compresses the spring 21 and is displaced toward the outlet 4. The fluid at the inlet 3 is the check valve body 19
From the projections 23 of the spring receiver 20 and through the holes 25 to the outlet 4. If the fluid pressure at the outlet 4 is greater than the fluid pressure at the inlet 3 minus the force of the spring 21, the check valve body 19 is displaced toward the inlet 3 by the fluid pressure at the outlet 4 and the action of the spring 21. To close the through hole 6 airtightly. When changing the valve opening pressure of the check valve 18, the ball 7 closes the fluid passage as shown in FIG. Then, the plug 28 is removed, a tool is inserted through the opening 27, and the tool is inserted into the outer periphery 26 of the projecting portion of the spring receiver 20, and the spring receiver 20 is advanced and retracted. By further screwing the spring receiver 20, the valve opening pressure of the forward flow increases, and by loosening the screw of the spring receiver 20, the valve opening pressure of the sequential flow decreases.

[0010]

[Effects of the Invention] The present invention has the following specific effects. Conventionally, a spring having a different elastic force must be incorporated for each desired valve opening pressure, or a valve casing having a different mounting position for the spring receiver must be manufactured, which increases inventory and production costs. According to the present invention, it is economical because a check valve built-in ball valve having a different valve opening pressure can be made by only one kind of member. Moreover, even after the piping, by removing the plug and the ball valve in the closed state, it is possible to adjust the position of the spring receiver, even without separately providing a stop valve on the primary side of the ball Lumpur valve check valve Changing the valve opening pressure
it can.

[Brief description of the drawings]

FIG. 1 is a sectional view of a ball valve with a built-in check valve according to an embodiment of the present invention.

FIG. 2 is a central longitudinal sectional view of FIG. 1 in a state where the ball of FIG. 1 is rotated by 90 degrees.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Cover member 3 Inlet 4 Outlet 6 Through-hole 7 Ball 13 Valve shaft 18 Check valve 19 Check valve 20 Spring receiver 21 Spring 22 Valve seat surface 27 Opening 28 Plug

Claims (1)

(57) [Scope of request for utility model registration] 1. A check valve built-in ball valve having a check valve disposed in a through hole of a ball disposed in a valve casing, wherein a check valve body of the check valve is disposed between the check valve and a spring receiver. in those urged in the closing direction by a spring, mounted for screw advance and retreat a spring received in the through hole, by operating the spring bearing from the outside portion facing the spring receiver of the valve housing in the closed state of the ball
To provide an opening for the screw to move forward and backward , and to close the opening
Ball valve with a built-in check valve with the plug of the above attached to the opening detachably .