JP2741217B2 - Controller - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller, such as a ball valve, used for ON-OFF control of a fluid flow.

Conventional technology In a ball valve, a fluid passage is provided in the body,
The ball is provided with a fluid passage hole, and the fluid passage is made to coincide with the fluid passage, or the fluid flow is turned on and off by crossing the fluid passage, but the operation is performed through the body By rotating the stem connected to the ball.

By the way, it is easy for fluid to leak from the part where the stem penetrates the body, but in order to prevent this, a gland part is provided in the same part, packing is packed into this, and the packing is pressed down with the packing presser. To make the same part airtight.

Problems to be Solved by the Invention When the packing is kept pressed for a long time, the stress is reduced and the airtight state is impaired.To prevent this, it is necessary to increase the pressing force in a timely manner. You have to take action and it is troublesome.

An object of the present invention is to provide a maintenance-free controller that solves the above problems.

Means for Solving the Problems A controller according to the present invention is provided with a fluid inlet hole and a fluid outlet hole on both sides of a hollow portion of a hollow body, and a pair of seat rings is provided with a central hole in each central hole. It is connected to the introduction hole and the fluid discharge hole, and is arranged so that the seat surfaces of the peripheral portion of the center hole face each other. Between the two seat rings, the balls slide on the seat surfaces of the two seat rings, respectively, and around the vertical axis. A fluid passage hole is provided so that the ball can freely rotate, and a fluid introduction hole and a fluid discharge hole can be connected to the ball via the center holes of both seat rings, and a top wall of the body above the ball is provided on the ball. A controller having an upper opening recess for sealing, a vertical stem penetrating the bottom wall of the recess, and a lower end thereof connected to a top of the ball so as to transmit rotation to the ball. The seal member holder is fitted between the outer surface of the stem and the peripheral surface of the recess, and the inner and outer surfaces of the seal member holder are brought into sliding contact with the outer surface of the stem and the peripheral surface of the recess, respectively. An annular groove is formed on the inner surface of the seal member holding body, the annular seal member is fitted into the annular groove, and an annular groove is formed on the lower end surface of the seal member holder. The seal member holding member is pressed by the pressing member.

In the controller according to the present invention, the seal member holder is fitted between the outer surface of the stem and the peripheral surface of the recess, and the inner and outer surfaces of the seal member holder are brought into sliding contact with the outer surface of the stem and the peripheral surface of the recess, respectively. The lower end surface is in contact with the bottom surface of the recess, an annular groove is formed in the inner surface of the seal member holding body, the annular seal member is fitted therein, and an annular groove is formed in the lower end surface of the seal member holding body. Since the annular seal member is fitted in the lever and the seal member holding body is pressed by the pressing member, the seal member exhibits a desired sealing property without being affected by the magnitude of the pressing force of the pressing member.

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

The controller has a hollow body 11. Body 11
Consists of an outer body 11A and an inner body 11B.

The outer body 11A includes a right-opening laterally-facing tubular body main body 21 having an end wall 21a, and a vertical plate-like lid closing the opening.
Consists of 22. Both the body 21 and the lid 22 are made of cast stainless steel. The cover 22 is attached to the body 21 by bolts 29 being screwed into the body 21 through the cover 22. Fluid introduction hole 23 in end wall 21a
The cover 22 is provided with a fluid outlet hole 24.
A vertical hole 25 is provided at the top of the body 21. A female screw 26 is provided above the vertical hole 25. End wall 21a
Fluid introduction hole 24 on the inner surface of lid 22 and inner surface of fluid introduction hole 23
O-rings 27 and 28 are respectively attached to the edges.

The inner body 11B includes left and right seat rings 12,13.
Both the seat rings 12, 13 and the ball 14 are made of ceramic. The left seat ring 12 is arranged such that its center hole is connected to the fluid introduction hole 23, and the right seat ring 13 is arranged so that its center hole is connected to the fluid outlet hole 24. Seat surfaces 12a, 13a are formed at the edges of the center hole on the opposing surfaces of the two seat rings 12, 13. A cylindrical spacer 31 extending from the outer periphery of the left seat ring 12 toward the right seat ring 13 is provided integrally therewith. The central portion including the seat surface 13a of the right seat ring 13 is formed as a thick portion 32, which is fitted into the tip of the spacer 31 via a packing ring 33, and the tip of the spacer 31 is provided outside the thick portion 32. The two seat rings 12, 13 are held at a predetermined interval by contacting the surfaces. At the top of the spacer 31, a recess 34 having a peripheral surface that matches the peripheral surface of the vertical hole 25 is provided, and a through hole 35 is provided at the center of the bottom wall of the recess 34. An O-ring 36 is attached to the distal end surface of the spacer 31.

A ball 14 is arranged between the two seat rings 12 and 13 and is in sliding contact with the seat surfaces 12a and 13a of the two seat rings 12 and 13 and is rotatable about a vertical axis. A fluid passage hole 37 is provided in the center of the ball 14 in a horizontally penetrating manner, and the fluid passage hole 37 communicates with the fluid introduction hole 23 and the fluid outlet hole 24 through the center holes of the seat rings 12, 13. Has become available. An upper opening engagement groove 38 is provided at the top of the ball 14.

Both seat rings 12, 13 and ball 14 are attached to body 21
A very small part of the right end of the right seat ring 13 protrudes from the body 21 in the state where the seat ring 12 is accommodated, and the sliding contact force between the seat rings 12, 13 and the ball 14 is changed by changing the tightening force of the bolt 29. Is adjusted, which ensures smooth rotation of the ball 14.

The stem 15 is passed through the through hole 35 of the spacer 31 so that the lower end protrudes downward, and an engaging protrusion 41 is formed in the protruding portion so as to protrude downward, and this is fitted into the engaging groove 38. I have. A flange 42 is provided in the middle of the length of the stem 15. A handle 43 is attached to the upper end of the stem 15.

Between the body body 21 and the stem 15 in the vertical hole 25, a synthetic resin cylindrical seal member holder 51 has a stem on its upper surface.
It is arranged to receive the fifteen flanges 42 and to have its lower end into the recess 34. An annular groove 71 is formed on the lower surface of the seal member holder 51, and an O-ring 52 is fitted into the annular groove 71. Upper and lower annular grooves 72, 73 are formed on the inner peripheral surface thereof, and an O-ring 53 and an annular packing are formed thereon. 54 are fitted respectively. Ring sliding flange 42 of stem 15
A pressing member 61 is arranged so as to press through the 55. A male screw 62 is provided on the outer surface of the holding member 61 and is screwed into the female screw 26 of the vertical hole 25, whereby the holding member 61 holds down the seal member holder 51 to fix it, and the stem 15 is rotatable. Holding.

Effects of the Invention According to the present invention, since the sealing member exhibits a desired sealing property without being affected by the magnitude of the pressing force by the pressing member, it is possible to increase the pressing force as described at the beginning. No action is required and a maintenance-free controller is obtained.

[Brief description of the drawings]

The drawing is a vertical vertical sectional view showing an embodiment of the present invention. 11 ... body, 12, 13 ... seat ring, 12a, 13a ... seat surface, 14 ... ball, 15 ... stem, 23 ... fluid introduction hole, 24 ... fluid outlet hole, 25 ... vertical hole , 31 ... spacer, 37 ... fluid passage hole, 51 ... seal member holder, 53 ...
... O-ring, 54 ... Packing, 71,72,73 ... Circular groove.

Claims (1)

(57) [Claims] 1. A fluid introduction hole 23 and a fluid outlet hole 24 are provided on both side walls of a hollow portion of a hollow body 11 so as to sandwich the hollow portion.
A pair of seat rings 12, 13 are arranged so as to connect the respective center holes to the fluid introduction hole 23 and the fluid outlet hole 24 and to face the seat surfaces 12a, 13a of the peripheral portion of the center hole to each other,
The ball 14 is between the two seat rings 12, 13
The fluid introduction hole 23 and the fluid are disposed on the ball 14 through the center holes of the seat rings 12 and 13 so that the fluid introduction hole 23 and the fluid can be freely rotated around the vertical axis by sliding contact with the seat surfaces 12a and 13a of the seat rings 2 and 13 respectively. A fluid passage hole 37 is provided so as to be able to communicate with the outlet hole 24, and upper opening recesses 25 and 34 for sealing are provided on the top wall of the body 11 above the ball 14, and on the bottom wall of the recesses 25 and 34. A controller in which a vertical stem 15 is penetrated and the lower end of which is connected to the top of the ball 14 so as to be able to transmit rotation to the ball 14, a seal member holding member between the outer surface of the stem 15 and the peripheral surfaces of the recesses 25 and 34. 51
The inner and outer surfaces of the seal member holder 51 are brought into sliding contact with the outer surface of the stem 15 and the peripheral surfaces of the recesses 25 and 34, respectively, and the lower end surfaces thereof are brought into contact with the bottom surfaces of the recesses 25 and 34. An annular groove 72, 73 is formed on the inner surface of the seal member holder 51, and the annular seal members 53, 54 are fitted therein. An annular groove 71 is formed on the lower end surface of the seal member holder 51, and the annular groove 71 A controller in which the seal member 52 is fitted and the seal member holder 51 is pressed by the pressing member 61.