JP2002061758A - Sluice valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sluice valve that can facilitate an adjustment in maintenance of the clearance dimension between a valve element seat and a valve casing seat to a dimension set in the design phase and can ensure high seat airtightness. SOLUTION: A valve stem support member 110 is mounted on a cover 3 to hold an end side of a valve stem 5 axially movable. The valve stem support member 10 is movable in an axis direction of a valve casing interior passage. A stopper bolt 14 and a setscrew 13 are arranged between the cover 3 and the valve stem support member 10, as a fixing means for positionally fixing the relative positions of them both.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate valve, and more particularly to a technique for controlling a high-temperature fluid.

[0002]

2. Description of the Related Art Conventional gate valves include, for example, those shown in FIG. In FIG. 3, a gate valve includes a valve box 2 having a cylindrical flow path 1 and a lid 3 connected to one side of the valve box 2.
And a circular valve element 4 housed and arranged inside the valve box 2 and the lid 3 and slidable in a direction crossing the flow path 1 of the valve box 2 to open and close the flow path 1. Valve stems 5 and 5 that slide and move in the opening and closing directions are provided. One end of each of the valve rods 5 is fixed to the outer periphery of the valve body 4, and the other end of the valve rod 5 extends upward through the upper end wall 3 a of the lid 3. As shown in FIG.
A seal portion 6 composed of a plurality of stages of ring-shaped packing, gland packing, and the like is provided in the lid penetrating portions of the valve stems 5, 5.

As shown in FIG. 5, a valve body 4, which is moved by the axial movement of the valve rods 5, 5, is provided with a valve body sheet 7 formed on the outer periphery of the valve body 4 when the valve is closed. 2 and is pressed into contact with the valve box sheets 8, 8 formed. At this time, the fluid pressure presses the valve element 4 in the axial direction of the flow path 1, and the valve rods 5, 5 are bent, so that the valve element sheet 7 comes into close contact with one of the valve box sheets 8, thereby ensuring the airtightness of the sheet. As a result, a valve closing posture without fluid leakage can be obtained.

[0004]

In the gate valve having the above-described structure, the gap between the valve body sheet 7 and the valve box sheet 8 is determined by an error in manufacturing the valve body sheet 7 and the valve box sheet 8 and the valve body 4.
Is affected by an error in the arrangement position of the valve stems 5, 5 that support the valve stems 5. In particular, since the valve stems 5, 5 are arranged by penetrating the cover penetrating portion provided on the cover 3, the relative position between the cover 3 and the valve stems 5, 5 is uniquely determined, and the arrangement of the valve stems 5, 5 is determined. The position cannot be adjusted. Therefore, at the initial stage of the installation, the gap between the valve body sheet 7 and the valve box sheet 8 is formed to a predetermined value by machining the valve body sheet 7 and the valve box sheet 8.

When the valve body sheet 7 or the valve box sheet 8 is replaced for maintenance or the like, the existing valve box sheet 8 or the valve body sheet 7 facing the new valve body sheet 7 or the valve box sheet 8 includes: Since mechanical processing such as polishing has already been performed at the time of initial setting, the clearance between the sheets 7 and 8 becomes larger than the dimension set at the time of design, and the adhesion between the sheets 7 and 8 due to fluid pressure cannot be secured. ,
There is a possibility that the airtightness of the seat is reduced and fluid leakage occurs when the valve is closed.

[0006] The present invention is to solve the above problems,
It is an object of the present invention to provide a gate valve capable of easily adjusting a clearance dimension between a valve body sheet and a valve box sheet to a set dimension at the time of design in maintenance and ensuring high seat airtightness.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a gate valve according to the present invention comprises a valve box, a lid fixed to the valve box, and a housing housed and arranged inside the valve box and the lid. A valve element that opens and closes a port by sliding in a direction traversing the flow path; a valve element sheet provided on a peripheral portion of the valve element; In a gate valve having a valve box seat provided inside the valve box facing the valve body sheet in the axial direction of the path, and a valve stem having one end fixed to the valve body, the other end of the valve stem is axially centered. A valve stem supporting member movably held in the direction is disposed on the lid, the valve stem supporting member is provided so as to be movable in the axial direction of the flow path in the valve box, and the relative positions of the lid and the valve stem supporting member are both set. A fixing means for positioning and fixing is provided.

With the above arrangement, at the time of initial setting, the valve stem and the valve stem supporting member are arranged at the neutral position in the axial direction of the flow passage in the valve box, and the valve body seat is arranged in the state where the valve body is arranged at the fully closed position. The valve box sheet and the valve body sheet are machined so that the gap between the valve box sheet and the valve box sheet becomes a predetermined value.

In the fully closed state during use, the pressure of the fluid urges the valve body to the downstream side, and the valve rod is bent, whereby the valve body sheet is pressed against the downstream valve box sheet. When renewing the valve body sheet or valve box sheet during maintenance, divert at least one of the two existing sheets,
The other new sheet is subjected to machining such as polishing to form a sheet surface. In this case, by adjusting the relative position between the lid and the valve stem supporting member by operating the fixing means in accordance with the increase in the clearance dimension between the two sheets, which is increased by machining.
The position of the valve stem supporting member is adjusted in the axial direction of the flow passage in the valve box. This makes it possible to return the gap size between the two sheets to the initial set gap size, and to prevent a decrease in the adhesion between the two sheets when the valve is closed, thereby ensuring high airtightness without any leakage at all times. it can.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. Since the basic configuration of the entire gate valve is the same as that shown in FIGS. 3 to 5, members performing the same action are denoted by the same reference numerals and description thereof is omitted.

As shown in FIGS. 1 and 2, two valve stems 5, 5 fixed to the valve body 4 are attached to a valve stem supporting member 10 mounted on the lid 3.
Are movably held in the axial direction, and the valve stem supporting member 1
Reference numeral 0 denotes a seal portion 6 provided at the penetrating portion and formed of a plurality of stages of ring-shaped packing, gland packing, and the like, and seals the periphery of the valve rods 5, 5.

The valve stem supporting member 10 is loosely fitted inside the large-diameter hole 11 formed in the lid 3 and is interposed between the lower surface of the flange 10a and the upper surface of the lid 3 around the large-diameter hole 11. While sealing with packing 12, flange 10a
And it is detachably attached to the lid 3 via a set screw 13. The valve stem support member 10 is movable (several mm) in the axial direction of the flow path in the valve box inside the large-diameter hole 11, and the through hole of the set screw 13 formed in the flange 10a is formed to have a somewhat large diameter. This allows the movement of the valve stem supporting member 10. Lid 3
A stopper bolt 14 is screwed and arranged on the side surface of the valve stem, and the stopper bolt 14 moves out and retreats in the axial direction of the flow path 1 in the valve box (arrow xy in FIG. 2) to position the valve stem supporting member 10. Make adjustments.

Hereinafter, the operation of the gate valve in the above configuration will be described. At the time of initial setting, the valve stem 5 and the valve stem supporting member 10 are arranged at a neutral position in the axial direction of the flow path in the valve box. In a state where the valve body 4 is arranged at the fully closed position,
The valve box sheet 8 and the valve body sheet 7 are machined so that the gap between the valve body sheet 7 and the valve box sheet 8 becomes a predetermined value.

In the fully closed state during use, the pressure of the fluid urges the valve body 4 to the downstream side, and the valve rod 5 bends so that the valve body sheet 7 comes into pressure contact with the downstream valve box sheet 8. In the case of renewing the valve body sheet 7 or the valve box sheet 8 during maintenance, at least one of the existing sheets is diverted, and the other new sheet is subjected to mechanical processing such as grinding to obtain a sheet. Form a surface. By this machining, the gap between the two sheets 7 and 8 becomes larger than the initially set dimension.

Here, in accordance with the increase in the clearance between the two sheets 7 and 8 due to machining, the stopper bolt 14 is screwed to move the valve stem supporting member 10 to the cover 3 so that the valve rod passage is formed in the valve box. 1 is adjusted in the axial direction x-y. As a result, it is possible to return the two sheets 7, 8 to the originally set gap size by subtracting the increase in the gap size between the two sheets 7, 8.
It is possible to prevent a decrease in the adhesion between the two seats 7 and 8 when the valve is closed, and to ensure a high airtightness without any fluid leakage at all times.

[0016]

As described above, according to the present invention, it is possible to reset the gap size of both sheets, which is increased by machining, to the originally set gap size by adjusting the position of the valve stem supporting member with respect to the lid. Thus, while diverting one of the sheets, the close contact between the two sheets at the time of closing the valve can be restored to a predetermined value, and a high airtightness without fluid leakage can be always secured.

[Brief description of the drawings]

FIG. 1 is an enlarged vertical sectional front view of a main part of a gate valve according to the present invention.

FIG. 2 is an enlarged vertical sectional side view of a main part of the gate valve.

FIG. 3 is a sectional view showing a basic configuration of a conventional gate valve.

FIG. 4 is an enlarged view of a main part of the gate valve.

FIG. 5 is an enlarged view of a main part of the gate valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flow path in a valve box 2 Valve box 3 Lid 4 Valve body 5 Valve rod 6 Seal part 7 Valve body sheet 8 Valve box sheet 10 Valve rod support member 10a Flange 12 Packing 13 Set screw 14 Stopper bolt

Claims (1)

[Claims] 1. A valve box and a lid fixed to the valve box, a valve body housed and disposed inside the valve box and the lid, and slidable in a direction crossing a flow path in the valve box to open and close a port, and a valve. A valve body sheet provided on the peripheral portion of the body, and slidably contacted with the valve body sheet in the opening and closing direction of the valve body, and provided inside the valve box facing the valve body sheet in the axial direction of the flow path in the valve box. In a gate valve having a valve box sheet and a valve stem having one end fixed to a valve body, a valve stem supporting member that holds the other end of the valve stem movably in the axial direction is disposed on a lid, and the valve stem is supported. A gate valve comprising: a member provided so as to be movable in an axial direction of a flow path in a valve box; and a fixing means for positioning and fixing both relative positions between a lid and a valve stem supporting member.