JP2013124773A5

JP2013124773A5 -

Info

Publication number: JP2013124773A5
Application number: JP2012265744A
Authority: JP
Filing date: 2012-11-16
Publication date: 2014-01-23
Anticipated expiration: 2032-11-16

Description

本発明は、対向するバックプレートとシールプレートの間に内蔵された開閉シリンダーによりシールユニットが作動し、バルブケーシングの開口部を開閉するゲートバルブにおいて、開動作圧と閉動作圧により伸縮するピストンロッドを覆うベローズの保護構造として、上記シールユニットはロッド部を備える開閉シリンダーと、上記開閉シリンダーが固定され、開閉のための開動作圧と閉動作圧を導通する供給排出路を備えたバックプレートと、上記開閉シリンダーのロッド部に結合されたシールプレートとで構成され、上記開閉シリンダーには上記ベローズの内圧又は外圧を感知する逆止弁が備わって、上記ベローズに加えられる内圧又は外圧が基準圧力を超過すれば、ベローズの内圧又は外圧を上記逆止弁を通じてシールユニット外部へ排出させることを特徴とするゲートバルブのベローズ保護構造を提供する。
The present invention relates to a piston rod that expands and contracts by an opening operation pressure and a closing operation pressure in a gate valve that opens and closes an opening of a valve casing by operating an opening / closing cylinder built between an opposing back plate and a sealing plate. The sealing unit includes an opening / closing cylinder having a rod portion, and a back plate having a supply / discharge path to which the opening / closing cylinder is fixed and which conducts an opening operation pressure and a closing operation pressure. A seal plate coupled to the rod portion of the open / close cylinder, and the open / close cylinder includes a check valve that senses an internal pressure or an external pressure of the bellows, and an internal pressure or an external pressure applied to the bellows is a reference pressure. If the pressure exceeds the internal pressure or external pressure of the bellows, Providing bellows protection structure of the gate valve, characterized in that for discharging.

また、本発明のゲートバルブのベローズ保護構造において、ピストンの形状は特に限定されないが、例えば、ピストンが凹形状をしており、上記ピストンの外径にシール部材を備え、上記凹形状の中央にピストンロッドを備え、上記ピストンロッドを覆うベローズの内径側がバルブケーシングと導通してなる構造を採用することができる。また、このゲートバルブのベローズ保護構造において、上記ピストンロッドを覆うベローズが開閉シリンダーに内包されていてもよい。
Moreover, in the bellows protection structure for a gate valve of the present invention, the shape of the piston is not particularly limited. For example, the piston has a concave shape, and a seal member is provided on the outer diameter of the piston. A structure in which a piston rod is provided and an inner diameter side of a bellows covering the piston rod is electrically connected to a valve casing can be employed. In the bellows protection structure of the gate valve, a bellows covering the piston rod may be included in the open / close cylinder .

また、本発明は、上記ゲートバルブのベローズ保護構造において、上記逆止弁は、一方が固定端として設置される弾性部材および、上記弾性部材の自由端にゲート部材が結合され、上記受圧口がゲート部材により塞がれて、受圧口について導通されるベローズの内圧が基準圧力を超過すれば、ゲート部材が後退し上記受圧口と排気口を連通させることを特徴とする。
In the bellows protection structure of the gate valve according to the present invention, the check valve includes an elastic member, one of which is installed as a fixed end, a gate member coupled to the free end of the elastic member, and the pressure receiving port If the internal pressure of the bellows closed by the gate member and conducted through the pressure receiving port exceeds the reference pressure, the gate member moves backward to connect the pressure receiving port and the exhaust port .

また、本発明は、上記ゲートバルブのベローズ保護構造において、上記排気口は閉動作圧排出口を通じてベローズの内圧を排気させることを特徴とする。
Further, the present invention provides a bellows protection structure of the gate valve, the exhaust port is characterized by evacuating the internal pressure of the bellows through closing pressure outlet.

また、本発明は、上記ゲートバルブのベローズ保護構造において、上記排気口は開動作圧排出口を通じてベローズの内圧を排気させることを特徴とする。
Further, the present invention provides a bellows protection structure of the gate valve, the exhaust port is characterized by evacuating the internal pressure of the bellows through the opening operation pressure outlet.

そして、このような昇降駆動部（２００）には別途のバルブロッド（図示無し）が空気圧供給路として軸方向へ平行に穴加工されて、これを通じて供給及び排気される空気圧によって所定の開口部を上記シールユニット（３００）が閉動作および開動作することができる。該当バルブロッドはシールユニット（３００）のバックプレート（３１０）に結合してバックプレート（３１０）の空気圧経路と連結される。
Further, a separate valve rod (not shown) is drilled in such an elevation drive unit (200) as a pneumatic supply path in parallel in the axial direction, and a predetermined opening is formed by the pneumatic pressure supplied and exhausted through the hole. The seal unit (300) can be closed and opened . The corresponding valve rod is connected to the back plate (310) of the seal unit (300) and connected to the pneumatic path of the back plate (310).

これらを防止するために該当開閉シリンダー（３２０）の内部には開動作圧供給時、ベローズ（３２６）の内圧上昇を感知し基準圧を超過する内圧発生時、該当ベローズ（３２６）に加えられる内圧を排気し、解消する第１逆止弁（３２７）が備わる。
In order to prevent these, an internal pressure applied to the corresponding bellows (326) when an open operation pressure is supplied to the inside of the corresponding open / close cylinder (320), an increase in the internal pressure of the bellows (326) is detected and an internal pressure exceeding the reference pressure is generated. Is provided with a first check valve (327) that exhausts and eliminates the air.

同じように、該当開閉シリンダー（３２０）の内部には閉動作圧供給時、ベローズ（３２６）の内圧を感知し基準圧を超過する内圧上昇発生時、該当ベローズ（３２６）に加えられる内圧を排気させ解消する第２逆止弁（３２８）が備わる。
Similarly , the internal pressure applied to the corresponding bellows (326) is exhausted when the internal pressure of the bellows (326) is detected and the internal pressure rises exceeding the reference pressure when the closing operation pressure is supplied to the inside of the open / close cylinder (320). A second check valve (328) that eliminates the problem is provided.

このような延長は上記ロッド部（３２３）に内蔵されることができる。また、上記本体部（３２７ｂ）は内部にスプリングの様な弾性部材（３２７ｄ）が一方を固定側として固定設置されて該当弾性部材（３２７ｄ）の自由側には上記受圧口（３２７ａ）を開閉できるゲート部材（３２７ｅ）が結合される。したがって、上記ゲート部材（３２７ｅ）は上記弾性部材（３２７ｄ）の弾性力によって平常時該当受圧口（３２７ａ）を防いでいて（図６の（ａ）参照），該当測定器に基準圧力（ＲＰ）を超過するベローズ（３２６）の内圧が引入れられれば該当空気圧に押されて受圧口（３２７ａ）を開放させることによって受圧口（３２７ａ）と排気口（３２７ｃ）を連通させ異常空気圧が排気口（３２７ｃ）を通じて排気（図６の（ｂ）参照）する構造である。
Such an extension can be built into the rod part (323). The main body portion (327b) has an elastic member (327d) such as a spring fixed inside, with one side being a fixed side, and the pressure receiving port (327a) can be opened and closed on the free side of the corresponding elastic member (327d). A gate member (327e) is coupled. Therefore, the gate member (327e) normally prevents the corresponding pressure receiving port (327a) by the elastic force of the elastic member (327d) (see FIG. 6 (a)), and applies the reference pressure (RP) to the corresponding measuring device. If the internal pressure of the bellows (326) exceeding the pressure is drawn, it is pushed by the corresponding air pressure to open the pressure receiving port (327a), thereby allowing the pressure receiving port (327a) and the exhaust port (327c) to communicate with each other. a structure for exhausting reference ((b) in FIG. 6) through 327 c).

より具体的には第２逆止弁（３２８）の排気口（３２８ｃ）は開動作圧排出経路（３１２）によって排気されて開動作圧排出口（３１１）により外部へ排気されることになる。
More specifically, the exhaust port (328c) of the second check valve (328) is exhausted through the open operation pressure discharge path (312) and exhausted to the outside through the open operation pressure discharge port (311).

Claims

In the gate valve that opens and closes the opening of the valve casing, the seal unit is operated by an open / close cylinder built in between the opposing back plate and seal plate.
As a protective structure for the bellows covering a piston rod extends and contracts by an opening operation pressure and closing pressure, the sealing unit is a closing cylinder with a rod portion,
The closing cylinder is fixed, and the back plate having a supply and discharge passage for conducting the opening operation pressure and closing pressure for opening and closing,
It is composed of a seal plate coupled to the rod part of the open / close cylinder,
Above the opening and closing cylinder is fitted with check valves to sense the pressure or external pressure of the bellows,
A bellows protection structure for a gate valve, wherein if the internal pressure or external pressure applied to the bellows exceeds a reference pressure, the internal pressure or external pressure of the bellows is discharged to the outside of the seal unit through the check valve.

The bellows protection structure for a gate valve according to claim 1,
The piston has a concave shape,
A seal member is provided on the outer diameter of the piston,
A piston rod is provided in the center of the concave shape,
A bellows protection structure for a gate valve, wherein an inner diameter side of a bellows covering the piston rod is electrically connected to a valve casing.

The bellows protection structure for a gate valve according to claim 2 ,
A bellows protection structure for a gate valve, wherein a bellows covering the piston rod is enclosed in an open / close cylinder.

The bellows protection structure for a gate valve according to claim 1,
The check valve has an elastic member, one of which is installed as a fixed end, and a gate member coupled to the free end of the elastic member,
The pressure receiving port is blocked by a gate member,
A bellows protection structure for a gate valve, wherein if the internal pressure of the bellows conducted with respect to the pressure receiving port exceeds a reference pressure, the gate member moves backward to connect the pressure receiving port and the exhaust port.

The bellows protection structure for a gate valve according to claim 4,
Bellows protection structure of the gate valve the exhaust port, characterized in that evacuating the internal pressure of the bellows through closing pressure outlet.

The bellows protection structure for a gate valve according to claim 4,
Bellows protection structure of the gate valve the exhaust port, characterized in that evacuating the internal pressure of the bellows through the opening operation pressure outlet.