JPH0875039A - Valve device - Google Patents

Abstract

PURPOSE: To prevent a leak over a long packing in the first packing chamber by a belleville spring through a gland bush, and tightening a packing in the second packing chamber by a screw through a gland packing. CONSTITUTION: Packing chambers 9, 10 dividing inside a valve case 1 into upper/lower two stages are charged with gland packings 25, 27, to screw a screw 23 in the periphery of a holder 24, having a recessed part of storing a belleville spring 21, tightened to a screw 29 in a mouth part side inner wall of the first packing chamber 9. Next by a plurality of the belleville springs 21 stored in the holder 24, the gland packing 25, with which inside the first packing chamber 9 is charged, is always pressed by action of the belleville spring 21 through a gland bush 26, to reduce a pressure of fluid by a packing layer adjacent to a mouth. In this way, stopping a leak can be performed, and since infiltration of fluid is not permitted to an upper layer packing, aged deterioration due to fatigue is prevented from being easily generated, so that a leak can be prevented over a long period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device in which a gland packing suitable for high temperature and high pressure adopts a shaft-sealing system in which a primary packing chamber and a secondary packing chamber have a two-stage structure.

[0002]

2. Description of the Related Art Conventionally, a high-pressure valve having the above-mentioned packing chamber in two stages is known as disclosed in Japanese Utility Model Publication No. 45-6364.

[0003]

In the conventional high pressure valve, when leakage occurs during use, the valve rod is allowed to move freely, and the valve rod is rotated and raised by using a wrench or the like. The cotter provided on the valve rod and the ridge of the gland are butted against each other, and twisted to compress the packing through the cylinder by the back surface of the gland to prevent leakage. Therefore, when the compression force becomes small, there are various troublesome drawbacks such as re-tightening through the valve rod.

[0004]

SUMMARY OF THE INVENTION The present invention was devised in order to solve this problem in view of such a situation, and has a valve seat which is opposed to the flow passage in the valve casing and which is opposed to the flow passage. A threaded rod is provided that is connected to a valve rod that suspends a flat plate-shaped valve element that can be moved up and down between the seats. Is supported by an upper end portion of the valve casing, and further, in the valve casing, first and second packing chambers are provided which are divided into upper and lower parts, and packing is loaded into the valve device. A screw is screwed on the inner wall near the mouth of the holder, and the packing loaded in the first packing chamber is inserted into the recess for accommodating the disc spring and the recess of the holder screwed for screwing the inner wall screw on the outer circumference. Pressed through the gland bush with the disc spring to be stored, and further into the second packing chamber Packing of loading is to provide a valve device which constantly to press the packing so as to perform the tightening screw through the ground from the top.

[0005]

According to the present invention, the gland packings 25 and 27 are provided in the packing chambers 9 and 10 which are provided by dividing the inside of the valve box 1 into upper and lower stages.
The screw 23 provided on the inner wall of the first packing chamber 9 on the mouth side of the first packing chamber 9 is screwed into the screw 23 on the outer periphery of the holder 24 having a recess for accommodating the disc spring, and is stored in the holder 24. With a plurality of disc springs 21, the gland packing 25 loaded in the first packing chamber 9 is constantly pressed by the action of the disc springs 21 via the gland bush 26, and the fluid pressure is reduced by the packing layer close to the mouth. Leakage can be prevented, and since fluid does not allow the fluid to permeate the upper packing, aging due to fatigue is unlikely to occur and leakage can be prevented for a long period of time.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show one embodiment of the valve device according to the present invention, which will be specifically described below with reference to the drawings.

A valve box 1 is provided with a feed port 2 and a delivery port 3 for allowing the fluid to linearly pass from the delivery port 2 toward the delivery port 3.

Further, the feed box 2 and the delivery port 3 are provided with flanges 2a and 3a, respectively, and the valve casing 1 is interposed between the pipes, and the flanges 2a and 3a are connected to the pipes.

In the central portion of the flow path of the valve casing 1, valve seats 4 and 4a which are opposed to each other are provided with a space 5 therebetween, and the space around the plate-shaped valve body 6 is moved up and down in the space 5. Enable and allow insertion.

The valve body 6 has a connecting portion 7 formed of a fitting groove portion on the upper surface thereof, and a tip head portion 8a of a valve rod 8 for suspending the valve body 6 is slidably fitted and coupled to the connecting portion 7.

The valve rod 8 passes through first and second vertical packing chambers 9 and 10 provided in an upper portion of the valve casing 1 and further through a hole 12 formed in the gland flange 11, and then the valve rod. A screw 8b is screwed on the upper part of the screw 8, and the screw 8b is screwed to the screw 14a inside the screw cylinder 14 supported by the inner flange 1b and the sleeve 13 at the upper end of the upper window frame 1a of the valve casing 1.

A screw 14b is screwed on the outer periphery of the upper end of the screw cylinder 14, and a key 14c from the screw cylinder 14 is fitted and locked in a groove of a handle 15 inserted into the screw cylinder 14 and fixed by a lock nut 16. To do.

Therefore, the valve rod 8 is moved up and down by the handle 15 via the screw cylinder 14.

Bearing pieces 17, 17 facing each other are provided at a lower position of the upper window frame 1a of the valve box 1, and the bearing pieces 17,
One end of each bolt 18 is pivotally attached to each of the bolts 17 by a pin 19, and the tip of each bolt 18 is inserted into each of the holes 11a and 11a formed at the end of the ground flange 11. 20 is screwed so that it can be tightened.

A screw 29 is screwed on the inner wall of the valve casing 1 near the mouth of the first packing chamber 9, and a plurality of disc springs 21 are stacked on the inner wall of the recess 22 and the outer periphery is screwed. 23
The holder 24 provided with is screwed into the screw 29.

A gland packing 25 is loaded in the first packing chamber 9, and the gland packing 25 is always pressed by a gland bush 26 provided on the disc spring 21 in the holder 24. is there.

A gland packing 27 is loaded in the second packing chamber 10, and the gland packing 27 is pressed from above by a gland flange 11 with a bolt 18 tightened through a gland bush 28.

[0018]

As described above, according to the present invention, the left and right valve seats are provided in the flow passage in the valve casing, and the valve rods for suspending the vertically movable flat plate-like valve element are connected between the valve seats. Further, a screw is screwed on the upper part of the valve rod, and a screw cylinder screwed to the screw and coupled to the handle is supported by the upper end portion of the valve box, and further provided in the valve box. First divided into upper and lower,
A valve device in which a second packing chamber is provided, and packing is loaded in the second packing chamber, wherein a screw is screwed on an inner wall of the first packing chamber near the mouth portion, and a gland bush for pressing the packing is attached to the screw. Always press the spring force.The screws of the holder that houses the disc spring are screwed together, and once the position of the holder is set, the disc spring always presses the packing evenly through the gland bush. Reduce the fluid pressure in the packing layer near the entrance,
Since leakage can be prevented, and since the fluid does not allow the fluid to penetrate into the upper layer packing, aging due to fatigue does not easily occur, and there is an effect that leakage can be prevented for a long period of time.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a valve device according to the present invention.

2 is a vertical front view of FIG. 1. FIG.

[Explanation of symbols]

 1 Valve Box 1a Window Frame 1b Flange 2 Feeding Port 3 Feeding Port 2a, 3a Flange 4, 4a Valve Seat 5 Interval 6 Valve Body 7 Connection 8 Valve Rod 8a Head 8b Screw 9 First Packing Chamber 10 Second Packing Chamber 11 gland flange 12 hole 13 sleeve 14 screw cylinder 14a, 14b screw 14c key 15 handle 16 lock nut 17 bearing piece 18 bolt 19 pin 20 nut 21 disc spring 23 screw 24, 29 holder 25, 27 gland packing 26, 28 gland bush

Claims (1)

[Claims] 1. A valve seat having left and right sides opposed to a flow path in a valve housing, and further provided with a valve rod for suspending a vertically movable flat plate valve element connected between the valve seats, A screw is screwed on the upper part of the valve rod, and a screw cylinder screwed on the screw and coupled to the handle is supported by the upper end of the valve box,
Further, in a valve device in which first and second packing chambers which are divided into upper and lower parts are provided in the valve casing and packing is loaded in the chambers, a screw is screwed on an inner wall of the first packing chamber near the mouth portion. The packing provided in the first packing chamber is housed in the recess for accommodating the disc spring, and the disc spring for accommodating the screw for engaging with the inner wall screw on the outer periphery of the holder. A valve device characterized in that the packing which is pressed and further loaded into the second packing chamber is screwed from above through a gland.