JP2802385B2 - Controller - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve, and more particularly, to a control valve that is opened and closed by rotating a stem whose upper part projects above a body.

2. Description of the Related Art In a control valve, a design tightening torque, that is, an optimum torque to be applied to a stem when the control valve is closed is set.

The stem is rotated by rotating a handle attached to the stem. However, the diameter of the handle is set in accordance with the design tightening torque.

Problems to be Solved by the Invention Even if the diameter of the handle is appropriately set as described above, the tightening torque varies depending on the person who operates the control valve, and the control valve may be damaged due to excessive tightening. Was.

An object of the present invention is to provide a control valve that has solved the above-mentioned problems.

Means for Solving the Problems A control valve according to the present invention is a control valve in which a plug at the lower end of the stem is opened / closed by approaching / separating from a seat by rotating a stem whose upper part protrudes above the body. The handle is rotatably attached to the protruding end of the stem, the connecting pin is fixed to the handle in a hanging manner, and the upper ring plate is rotatably and vertically movable below the protruding end of the stem, and the connecting pin is fitted into this. Guide holes are provided, the lower ring plate is fixed to the stem so as to face the upper ring plate, and the ball is placed at a plurality of positions on a circumference around the axis of the stem on one of the upper ring plate lower surface and the lower ring plate upper surface. Partially protruding pockets are provided, and recesses are provided at multiple positions corresponding to the pockets on the other side. Therefore, the recess is urged downward, and the recess has a length extending in the circumferential direction around the axis of the stem, and with reference to the rotation direction of the stem toward the valve closing position, from one end of the recess. The recess is formed such that the depth of the recess gradually decreases toward the other end.

In the control valve according to the present invention, the handle is rotatably attached to the protruding end of the stem, the connecting pin is fixed to the handle in a hanging manner, and the upper ring plate is rotatably and vertically movable below the protruding end of the stem. When the handle is rotated, the rotation is transmitted to the upper ring by the connecting pin, and the upper ring rotates in the same direction as the handle.

Furthermore, the lower ring plate is fixed to the stem so as to face the upper ring plate, and the ball is partially protruded at a plurality of positions on the circumference around the axis of the stem on one of the upper ring plate lower surface and the lower ring plate upper surface. There are pockets in which the fittings are inserted, and recesses in which the protrusions of the balls are fitted are provided in a plurality of positions corresponding to the pockets on the other side, and the upper ring plate is urged downward by a spring. When rotated in the same direction as the handle, the rotation is transmitted to the lower ring by the ball, and the lower ring rotates together with the stem in the same direction as the upper ring.

The control valve is opened and closed with the rotation of the stem, but when the control valve is closed, the rotation of the stem is stopped because the stem cannot rotate any more, and thus the rotation of the lower ring plate is also stopped. If the handle is further rotated from this state, a rotational torque is generated between the upper and lower annular plates, and when this torque reaches a predetermined torque, the upper annular plate is raised against the force of the spring, and the ball comes out of the recess. As a result, the upper ring plate idles and its rotational force cannot be transmitted to the lower ring plate, and therefore, a torque greater than a predetermined torque does not act on the stem.

The recess has a length extending in the circumferential direction about the axis of the stem, and the depth of the recess extends from one end to the other end of the recess with reference to the rotation direction of the stem toward the valve closing position. Is formed so that it gradually becomes shallower,
The return torque when closing the valve is greater than the shutoff torque when closing the valve.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

The valve body 11 has an upper opening chamber 12 and an inlet 14 communicating below the seat 13 of the chamber 12.
And an outlet 15 communicating above the seat 13 of the chamber 12. At the opening edge of the chamber 12, an upwardly projecting vertical cylindrical portion 16 with an external thread is provided, into which a stem 17 is inserted so as to project its upper part. At the lower end of the stem 17, a plug 18 is provided integrally. A washer 19, a gland packing 20, a packing assembly 21 and a sleeve 22 are sequentially inserted from below into the cylindrical portion surrounding the lower portion of the stem 17, and
A packing holding nut 23 is screwed into the cylindrical portion 16 so as to hold the packing 22. The sleeve 22 is provided with a female screw 24, and a male screw 25 screwed into the female screw 24 is provided on the stem 17.

A center hole 32 is provided in the top wall of the handle 31 with a skirt in a vertically penetrating manner, through which the stem 17 is passed. Stem
The upper end of 17 protrudes upward through a center hole 32, and a cap nut 34 is fitted to a male screw 33 provided at the protruding portion.
Four connecting pins 35 are provided on the lower surface of the top wall of the handle 31 for the stem 17.
Are fixed at equal intervals on a circumference centered on the axis of. Four recesses 36 are provided so as to be located one by one between two adjacent connection pins 35,
The compression springs 37 are accommodated in the recesses 36 one by one. The upper ring plate 38 is positioned below the top wall of the handle 31 so that the stem 17
, And a spring 37 is received by the upper ring plate 38.
A guide hole 39 in which the connecting pin 35 is slidably inserted in the upper ring plate 38.
Is provided. Pockets 41 are provided on the lower surface of the lower annular plate 38 directly below the springs 37, respectively.
, A ball 42 is fitted in a partially protruding shape. Upper ring plate 38
The lower ring plate 43 is fixed to the stem 17 so as to face. On the upper surface of the lower annular plate 43, spherical recesses 44 are provided corresponding to the pockets 41, and the projections of the balls 42 are fitted in the respective recesses 44. An O-ring 45 is attached to the outer peripheral surface of the lower annular plate 43. The O-ring 45 is in sliding contact with the inner surface of the peripheral wall of the handle 31 and serves to reduce the impact at the time of operating the handle 31 and obtain a smooth operation feeling of the handle 31.

When the stem 17 is rotated to the right (when viewed from above),
Stem 17 descends, plug 18 descends with stem 17
Is seated on the seat 13 and the valve is closed (the state shown in FIG. 1). In this state, the stem 17 cannot be further rotated rightward. When the stem 17 is rotated to the left from the state in which the valve is closed, the plug rises together with the stem 17 and the valve is opened.

Now, assume that the valve is open. When the handle 31 is rotated clockwise in this state, the rotation is transmitted to the upper ring 38 by the connecting pin 35, and the upper ring 38 is rotated right. Rotation of the upper ring plate 38 is performed by the lower ring plate 43 by the ball 42.
The lower ring 43 rotates rightward with the stem 17, and the rotating stem 17 descends. Eventually, the plug 18 is seated on the seat 13 and the rotation of the stem 17 is stopped.
When the handle 31 is further rotated, the upper ring plate 38 tries to rotate together with the handle 31, but the stem 17 cannot rotate, and therefore the lower ring plate 43 cannot rotate. Rotating force is generated as a relative rotating force between the upper ring plate 38 and the lower ring plate 43. The ball 42 is pushed by the relative rotational force in a direction in which the handle 31 is to be rotated. This allows the ball
By rotating the upper ring plate 38 against the force of the spring 37, the rotational force of the ball 42
Is transmitted to the lower ring plate 43 and the stem 17, and a force corresponding to the transmitted rotational force acts downward on the stem 17 to press the plug 18 against the seat 13, but when the ball 42 comes out of the recess 44, Then, the rotational force is not transmitted to the lower annular plate 43 by the ball 42. Accordingly, the plug 18 is seated with a force corresponding to the rotational force until the ball 42 comes out of the recess 44.
Pressed to 13.

As described above, when the handle 31 is rotated leftward from the state in which the valve is closed, a rotational force having a magnitude equal to the rotational force when the valve is closed is transmitted to the stem 17 in the leftward direction. Acting to rotate, the stem 17 rotates to the left and rises, opening the valve.

3 and 4 show another embodiment. In this embodiment, the shape of the recess 54 is on a circumference centered on the axis of the stem 17 when viewed from a plane, and has a substantially oval shape.
Has a gradually decreasing depth from one end to the other in the clockwise direction. Accordingly, when the handle 31 is rotated to the right, the rotation force until the ball 42 comes out of the recess 54 is used to rotate the handle 31 to the left.
The rotational force until the 42 comes out of the recess 54 is larger. In other words, the rotational force at the time of opening the valve, that is, the return torque, is larger than the rotational force at the time of closing the valve, that is, the shutoff torque, in order to deal with the following situation. That is, if the frequency of use of the valve is low, the return torque may need to be larger than the shut-off torque due to frictional resistance and adhesion between components.

According to the present invention, when the rotational torque for rotating the handle reaches a predetermined torque, the upper ring is lifted against the force of the spring, and the ball comes out of the recess, so that the upper ring is As the wheel spins, its rotational torque is not transmitted to the lower ring plate, and a torque equal to or greater than a predetermined torque acts on the stem, thereby preventing damage to the control valve due to excessive tightening of the handle.

Further, since the return torque at the time of closing the valve is larger than the shut-off torque at the time of closing the valve, it is difficult to open the valve because the valve is kept closed for a long period of time, for example, a plug is bitten by a seat. In such cases, it can be effectively dealt with.

[Brief description of the drawings]

1 is a longitudinal sectional view, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is another embodiment corresponding to FIG. FIG. 4 is a sectional view of FIG.
FIG. 11 ... body, 17 ... stem, 31 ... handle, 35 ...
Connecting pin, 37 ... Spring, 38 ... Upper ring plate, 39 ... Guide hole, 41 ... Pocket, 42 ... Ball, 43 ... Lower ring plate, 4
4,54 …… a recess.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G05G 1/00-25/04 F16D 7/06 F16K 31/44

Claims (1)

(57) [Claims] 1. A plug at the lower end of a stem (17) is rotated by rotating a stem (17) having an upper portion protruding above the body (11).
In the control valve, which is opened and closed with the 18 approaching / separating from the seat 13, the handle 31 is rotatably attached to the protruding end of the stem 17, the connecting pin 35 is fixed to the handle 31 in a hanging manner, An upper ring 38 is rotatably and vertically movable at the lower end thereof, and a guide hole 39 in which a connecting pin 35 is inserted is provided therein.
A pocket 41 in which a ball 42 is partially inserted is provided at a plurality of positions on the circumference around the axis of the stem 17 on one of the lower surface of the upper annular plate 38 and the upper surface of the lower annular plate 43, At a plurality of positions corresponding to the pockets 41 on the other side, there are provided recesses 54 into which the protruding portions of the balls 42 are fitted, and the upper ring plate 38 is urged downward by the spring 37, and the recesses 54 Stem with a length extending in the circumferential direction about the axis of
A control valve formed such that the depth of the recess 54 gradually decreases from one end to the other end of the recess 54 with reference to the rotation direction of the 17.