JPH1151222A - Double check type drain valve fitted with relief valve - Google Patents
Double check type drain valve fitted with relief valveInfo
- Publication number
- JPH1151222A JPH1151222A JP21276697A JP21276697A JPH1151222A JP H1151222 A JPH1151222 A JP H1151222A JP 21276697 A JP21276697 A JP 21276697A JP 21276697 A JP21276697 A JP 21276697A JP H1151222 A JPH1151222 A JP H1151222A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- drain
- check
- check valve
- relief
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Check Valves (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、寒冷地で使用され
るドレンバルブに、より完璧な逆流防止機能を有せしめ
た、逃し弁付二重逆止型ドレンバルブに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double check type drain valve with a relief valve, which has a more complete backflow prevention function for a drain valve used in cold regions.
【０００２】[0002]
【従来の技術】従来、寒冷地では、凍結防止上、建物内
の水道配管内の水を抜くために、配管根元の不凍結部分
にドレンバルブを設置し、手動操作、あるいは電動によ
る遠隔操作によりドレンバルブを作動させ、流入口から
の水を遮断するとともに、流出口と排水口を開放し、ド
レンバルブ下流側配管内の水を排水口から排出するよう
にしている。その場合、ドレンバルブ自体に逆止弁を組
み込み、逆サイホン或いは逆流による本管内の汚染を防
止することが以前から行われており（例えば同一出願人
による実公昭５８ー４２５３３号）、ドレンバルブ下流
側の配管途中に設けるよりも、水抜き時、凍結防止のた
め、逆止弁の弁体を手動で解除する煩わしさがなく、便
利となる。2. Description of the Related Art Conventionally, in cold regions, in order to prevent freezing, a drain valve is installed at an unfreezing portion at the base of a pipe to drain water from a water pipe in a building, and the drain valve is manually operated or remotely operated by electric motor. The drain valve is operated to shut off water from the inflow port, open the outflow port and the drain port, and discharge water in the drain valve downstream pipe from the drain port. In this case, a check valve has been incorporated in the drain valve itself to prevent contamination in the main pipe due to a reverse siphon or a reverse flow (for example, Japanese Utility Model Publication No. 58-42533 by the same applicant), and the downstream of the drain valve has been used. It is more convenient and convenient to manually release the valve body of the check valve to prevent freezing at the time of draining water than to provide it in the middle of the piping on the side.
【０００３】しかし最近では、寒冷地でも衛生管理上の
問題から直結給水が次第に増え始め、それに伴って、寒
冷地向けの、上述したものより数段逆止性能に優れた、
信頼性の高い逆流防止器が要求されるようになってき
た。However, recently, even in cold regions, direct water supply has gradually started to increase due to problems in hygiene management, and with this, the cold-water region has a more excellent non-return performance than that described above for cold regions.
A highly reliable backflow preventer has been required.
【０００４】[0004]
【発明が解決しようとする課題】上記点に鑑み、本発明
においてはドレンバルブ自体に逆止機能を有せしめて、
水抜き時の逆止弁体解除操作を必要とせず、独立して作
動する２個の逆止弁の他、逃し弁を弁箱内に機能的に配
置し、逆止性能に高い信頼性を有する、コンパクトでコ
ストの安い、損失水頭が小さい逃し弁付二重逆止型ドレ
ンバルブを提供せんとするものである。In view of the above, in the present invention, the drain valve itself has a check function,
The check valve release operation is not required at the time of draining. In addition to the two check valves that operate independently, a relief valve is functionally arranged in the valve box to ensure high reliability in the check performance. It is an object of the present invention to provide a double check type drain valve with a relief valve which is compact, inexpensive and has a small head loss.
【０００５】[0005]
【課題を解決するための手段】そのため本発明において
は、弁箱の上流側に、内部に流水路を有し、外周に流入
口からの圧力水を遮断する密封パッキンおよび弁箱に設
ける逃し弁座を閉塞する逃がしパッキンを装着する逃し
弁と、その流水路末端部に形成する第１逆止弁座を閉塞
する第１逆止弁とを位置させ、その下流側に、シリンダ
内を往復動する環状パッキンを装着する操作ピストン
と、操作ピストンと一体に、或いは連動して弁箱下端部
に設ける排水口を開閉する排水弁と、その両者間に第２
逆止弁を位置させてなるものである。SUMMARY OF THE INVENTION Therefore, in the present invention, there is provided a sealing gasket having a water flow passage therein at an upstream side of a valve box and having an outer periphery for shutting off pressurized water from an inlet, and a relief valve provided on the valve box. A relief valve for mounting a relief packing for closing the seat and a first check valve for closing a first check valve seat formed at the end of the flowing water channel are positioned, and reciprocating in the cylinder downstream thereof. An operating piston for mounting an annular packing, a drain valve for opening and closing a drain port provided at the lower end of the valve box integrally or in conjunction with the operating piston;
The check valve is located.
【０００６】[0006]
【発明の実施の形態】逃し弁の密封パッキンはダイヤフ
ラムを用いて摺動摩擦の影響を回避するのが普通である
が、摩擦力の小さい、経年変化の影響を受けにくい、グ
リース塗布の環状パッキンを使用することもできる。
逃し弁内部にガイド体を接続して第１逆止弁の案内とし
ているが、ガイド体を省略し、逃し弁内壁を案内として
も良い。さらに、逃し弁を流入口方向に押圧するバネ
と、第１逆止弁を押圧するばねは別体にしても良く、ま
た、実施例のように共用して一つで済ませるようにして
も良い。別体にする場合は、ガイド体を台座として第１
逆止弁を前方から引っ張るようにしても良い。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The sealing gasket of a relief valve usually uses a diaphragm to avoid the influence of sliding friction. However, a grease-coated annular gasket having a small frictional force and less susceptible to aging is used. Can also be used.
Although the guide body is connected to the inside of the relief valve to guide the first check valve, the guide body may be omitted and the inner wall of the relief valve may be used as the guide. Further, the spring that presses the relief valve in the direction of the inflow port and the spring that presses the first check valve may be separate bodies, or may be shared and used as in the embodiment. . If you want to separate the guide body as a base
The check valve may be pulled from the front.
【０００７】第２逆止弁はシリンダに環状パッキンが密
着して止水するものと、弁座に駒パッキンが押圧されて
止水するものとを例示しているが、その他にも、テーパ
ー状の弁座に、Ｏリングを押圧させる方法もあり、ま
た、パッキンが止水の役目を兼ねるものと兼ねないもの
があるが、少なくとも排水時には第２逆止弁が排水を阻
害することがないようにしなければならない。The second check valve is exemplified by one in which an annular packing is tightly attached to a cylinder to stop water, and one in which a piece packing is pressed against a valve seat to stop water. There is a method of pressing the O-ring on the valve seat, and there is also a method in which the packing also serves as a water stop function, but at least at the time of drainage, the second check valve does not hinder the drainage. Must be.
【０００８】電動で開閉操作するものを例示している
が、これは勿論、手動で操作しても良く、操作ピストン
を上下動させて通水、排水状態を選択するのが普通であ
るが、回転動のみで行わせることもできる。[0008] An example of an electric motor that opens and closes is illustrated. However, it is of course possible to operate the motor manually, and it is common to select the water passing and draining state by moving the operating piston up and down. The rotation can be performed only.
【０００９】排水弁は操作ピストンと一体に接続される
もの、連結されるもの、分離しているものがあるが、い
ずれも中間部に第２逆止弁を介在させており、操作ピス
トンの往復動により排水口を開閉するようにしている。The drain valve may be connected to the operating piston integrally, connected to the operating piston, or separated from the operating piston. In any case, the second check valve is interposed in the intermediate portion, and the operating piston reciprocates. The drain is opened and closed by movement.
【００１０】例えば、凍結等により流出側配管内の圧力
が上昇したとき、第２逆止弁により異常圧力の逃げ場が
なく、ひどいときには弁箱や配管自体を破損することも
あるが、ある一定の圧力に達すれば、異常圧力を排水口
から逃がす機構を、操作ピストン、排水弁に有せしめる
こともでき、寒冷地においては有効な手段となる。[0010] For example, when the pressure in the outflow pipe increases due to freezing or the like, there is no escape place for abnormal pressure by the second check valve. In severe cases, the valve box or the pipe itself may be damaged. When the pressure reaches the pressure, a mechanism for releasing abnormal pressure from the drain port can be provided in the operation piston and the drain valve, which is an effective means in a cold region.
【００１１】[0011]
【実施例】図１に本発明の１実施例を示しているが、１
は弁箱であり、左端に流入口２、右端に流出口３を、下
端に排水口４を設けている。流入口２と第１逆止弁室５
間に逃し弁室６を形成し、第１逆止弁室５と流出口３間
に第２逆止弁室７を、第２逆止弁室７と排水口４間に排
水室８を形成する。FIG. 1 shows an embodiment of the present invention.
Is a valve box having an inlet 2 at the left end, an outlet 3 at the right end, and a drain port 4 at the lower end. Inflow port 2 and first check valve chamber 5
A relief valve chamber 6 is formed therebetween, a second check valve chamber 7 is formed between the first check valve chamber 5 and the outlet 3, and a drain chamber 8 is formed between the second check valve chamber 7 and the drain port 4. I do.
【００１２】第１逆止弁室５の先端に逃し弁座９を、第
２逆止弁室７の上方に同径のシリンダ１０、１１を形成
し、シリンダ１１下端に第２逆止弁座１２を設ける。逃
し弁室６と排水室８は連通路１３を介して連通し、排水
口４に開口している。A relief valve seat 9 is formed at the end of the first check valve chamber 5, and cylinders 10 and 11 having the same diameter are formed above the second check valve chamber 7. A second check valve seat is formed at the lower end of the cylinder 11. 12 are provided. The relief valve chamber 6 and the drainage chamber 8 communicate with each other through a communication passage 13 and open to the drainage port 4.
【００１３】逃し弁室６に収容される逃し弁１４は、外
周に、流入口２側の圧力を受けるダイヤフラム１５をガ
イド体１６によりねじ接続し、更に上記逃し弁座９に密
着する逃がしパッキン１７を装着する。ダイヤフラム１
５は他端をビス１８により弁箱１に固定する。内部を大
きく開口して流水路１９とし、その末端部に第１逆止弁
座２０を形成する。The relief valve 14 housed in the relief valve chamber 6 is connected to the outer periphery thereof by a diaphragm 15 which receives the pressure on the inflow port 2 side by means of a guide member 16, and furthermore, a relief packing 17 which comes into close contact with the relief valve seat 9. Attach. Diaphragm 1
The other end 5 is fixed to the valve box 1 by screws 18. The inside is greatly opened to form a water passage 19, and a first check valve seat 20 is formed at the end thereof.
【００１４】ガイド体１６を案内として移動する第１逆
止弁２１には、第１逆止弁座２０に密着する第１逆止パ
ッキン２２を装着し、ばね２３に押圧されて逆止効果を
高めると共に、逃し弁１４に常に流入口２方向への押圧
力を与えるようにしている。The first check valve 21 which moves with the guide body 16 as a guide is provided with a first check packing 22 which is in close contact with the first check valve seat 20 and is pressed by a spring 23 to exert a check effect. At the same time, the pressing force in the direction of the inflow port 2 is always applied to the relief valve 14.
【００１５】操作ピストン２４にはシリンダ１０、１１
を摺動する２個の環状パッキン２５、２６を装着し、下
端にガイド穴２７を穿っている。上記ガイド穴２７を案
内として上下動する第２逆止弁２８には、第２逆止弁座
１２に密着する第２逆止パッキン２９を装着し、逆止ば
ね３０より常に上方への力を受けるようにしている。The operating piston 24 has cylinders 10 and 11
Are mounted, and a guide hole 27 is formed at the lower end. The second check valve 28 that moves up and down with the guide hole 27 as a guide is equipped with a second check packing 29 that is in close contact with the second check valve seat 12, and always applies a force upward from the check spring 30. I am going to receive it.
【００１６】排水弁室８には排水プラグ３１をねじ接続
し、その中に排水弁３２を収容する。排水弁３２には、
排水プラグ３１に形成される排水弁座３３に密着する排
水パッキン３４、排水シリンダ３５を摺動する排水環状
パッキン３６を装着し、排水ばね３７により、常に上方
向への力を受けている。３８は排水横穴である。A drain plug 31 is screw-connected to the drain valve chamber 8, and a drain valve 32 is accommodated therein. The drain valve 32 includes
A drain gasket 34 that is in close contact with a drain valve seat 33 formed on the drain plug 31 and a drain annular gasket 36 that slides on a drain cylinder 35 are attached. The drain spring 37 constantly receives an upward force. Reference numeral 38 denotes a horizontal drain hole.
【００１７】排水弁座３３と排水シリンダ３５は排水弁
座３３を若干大径にし、流出口３側の圧力による、排水
パッキン３４に作用する下降力が、小孔３９を通って排
水環状パッキン３６に作用する上昇力よりもやや大きく
しており、流出側圧力が、必要な弁箱の耐圧性能、例え
ば１．７５ＭＰａより一定程度大きくなったとき、排水
ばね３７に打ち勝って排水弁３２を下降するようにして
おり、凍結による異常圧力の上昇を防止できることにな
る。The drain valve seat 33 and the drain cylinder 35 make the drain valve seat 33 slightly larger in diameter, and the downward force acting on the drain packing 34 due to the pressure on the outlet 3 side passes through the small hole 39 to form the drain annular packing 36. Is slightly larger than the rising force acting on the drain valve 32, and when the outflow side pressure becomes a certain degree higher than the required pressure resistance of the valve box, for example, 1.75 MPa, the drain valve 32 descends by overcoming the drain spring 37. As a result, an increase in abnormal pressure due to freezing can be prevented.
【００１８】操作ピストン２４の上端は、操作軸４０を
介して駆動ボックス４１内の、いずれも図面は省略する
が、駆動軸に連結され、減速歯車を介してモーターによ
り駆動される。The upper end of the operation piston 24 is connected to the drive shaft, though not shown, in a drive box 41 via an operation shaft 40, and is driven by a motor via a reduction gear.
【００１９】図は操作ピストン２４が開で、末端の蛇口
を止めた停水状態を示しているが、この状態から蛇口を
開くと、流入口２側の水は流水路１９を通って、第１逆
止弁２１を右方に移動させ、更に第２逆止弁２８を下降
させて、図示しないが流出口３に接続された下流側配管
を通って蛇口に到達する。蛇口を閉じれば逆止ばね２
３、３０に押圧されて逆止弁２１、２８は図１の状態に
復帰し、逆止パッキン２２、２９がそれぞれ逆止弁座２
０、１２に密着する。この時、ばね２３は必須の構成要
件になるが、第２逆止弁２８を１より比重の小さい樹脂
で成型し、浮力で上昇させるようにすれば、第２逆止ば
ね３０を省略することも可能となる。The figure shows a water stopped state in which the operation piston 24 is open and the faucet at the end is stopped. When the faucet is opened from this state, the water on the inflow port 2 side passes through the water passage 19 and the The first check valve 21 is moved rightward, and the second check valve 28 is further lowered to reach the faucet through a downstream pipe (not shown) connected to the outlet 3. Close the faucet and check spring 2
The check valves 21 and 28 are returned to the state shown in FIG. 1 by being pressed by the check valves 3 and 30 and the check packings 22 and 29 are connected to the check valve seat 2 respectively.
Close contact with 0 and 12. At this time, the spring 23 is an essential component, but if the second check valve 28 is molded from a resin having a specific gravity smaller than 1, and is raised by buoyancy, the second check spring 30 can be omitted. Is also possible.
【００２０】流出口３側の圧力が流入口２側の圧力より
も高くなる、いわゆる逆圧現象が発生したときには、第
２逆止弁２８が正常に働いている限り、流出側配管内の
水が流入口２内に逆流することはないが、もし、第２逆
止弁２８に異物がはさまったりして漏水が生じたような
ときには、第１逆止弁室５内の圧力が流入口２内の圧力
より高くなる、或いは両者の圧力差が一定以上接近する
ため、逃がし弁１４はばね２３に押圧されて逃がしパッ
キン１７が逃がし弁座９から離脱し、逆流水を連通路１
３から排水口４へと排出する。ばね２３を強くするほど
両者の圧力差が大きくなるため、損失水頭は大きくなる
が、逆流に対してはより安全になる。When the pressure at the outlet 3 becomes higher than the pressure at the inlet 2, that is, when a so-called back pressure phenomenon occurs, as long as the second check valve 28 operates normally, the water in the outlet pipe is Does not flow back into the inlet 2, but if foreign matter gets stuck in the second check valve 28 and water leaks, the pressure in the first check valve chamber 5 increases The relief valve 14 is pressed by a spring 23 to release the relief gasket 17 from the relief valve seat 9, and the backflow water flows through the communication passage 1.
Discharge from 3 to drain 4. As the spring 23 is strengthened, the pressure difference between the two increases, so the head loss increases, but it is more secure against backflow.
【００２１】本管工事等で断水し、流入口２側の圧力が
大気圧以下に低下すると、流出口３下流側配管内の水が
逆サイホン現象により流入口２側に逆流しようとする
が、やはり第１逆止弁２１と第２逆止弁２８により逆流
は阻止され、同時に逃がし弁１４はばね２３と負圧力に
より最大開口する。この時、第１逆止弁２１の故障で漏
れがあったような場合には、排水口４から空気を吸入し
て配管内の負圧を減少させる。When the water supply is cut off due to the main pipe work and the pressure on the side of the inflow port 2 drops below the atmospheric pressure, the water in the downstream pipe of the outflow port 3 tries to flow back to the inflow port 2 due to the reverse siphon phenomenon. Again, the backflow is prevented by the first check valve 21 and the second check valve 28, and at the same time, the relief valve 14 is maximally opened by the spring 23 and the negative pressure. At this time, if there is a leak due to the failure of the first check valve 21, air is sucked from the drain port 4 to reduce the negative pressure in the pipe.
【００２２】冬、配管内の水を抜きたいときには、図面
は省略するが、室内の制御ボックスに設けられたスイッ
チを投入すると、駆動ボックス４１内のモーターが回転
し、減速歯車を介して駆同軸を下降させ、同時に、操作
軸４０を介して操作ピストン２４も下降する。そのと
き、まず、環状パッキン２６がシリンダ１２に密着して
流入口２側の水を遮断し、さらに下降して、第２逆止弁
２８下端が排水弁３２上端に当接し、排水ばね３７を圧
縮しながら排水弁３２を下降させるため、流出側配管内
の水は排水横孔３８、連通路１３を通って、排水口４へ
と排出される。In winter, when it is desired to drain water from the pipes, the drawing is omitted, but when a switch provided in the control box in the room is turned on, the motor in the drive box 41 rotates, and the motor is driven through the reduction gear. At the same time, the operating piston 24 is also lowered via the operating shaft 40. At that time, first, the annular packing 26 comes into close contact with the cylinder 12 to shut off water on the inflow port 2 side, and further descends, so that the lower end of the second check valve 28 contacts the upper end of the drain valve 32, and the drain spring 37 is turned off. In order to lower the drain valve 32 while compressing, the water in the outlet pipe is discharged to the drain port 4 through the drain horizontal hole 38 and the communication passage 13.
【００２３】図２に本発明の第２逆止弁側の他の実施例
を示すが、本実施例においては、操作ピストン２４には
１個の環状パッキン２５しか有しておらず、下端に第２
逆止弁２８を管吊り方式で上下動自在に連結している。FIG. 2 shows another embodiment of the second check valve side of the present invention. In this embodiment, the operating piston 24 has only one annular packing 25, Second
The check valve 28 is connected to be vertically movable by a pipe hanging method.
【００２４】第２逆止弁２８はシリンダ１１に密着する
逆止環状パッキン４２を装着し、シリンダ４３を案内と
して上下動するようにしている。下端部にピン４４を内
部に突出するように設け、側方に縦溝４５を穿った排水
弁３２を、第２逆止ばね３０を介して、離脱することな
く、かつ上下動自在に連結している。操作ピストン２４
と第２逆止弁２８と排水弁３２の連結態様は１例を示し
ているに過ぎず、他にも種々の方式が考えられる。The second check valve 28 is provided with a check annular packing 42 which is in close contact with the cylinder 11 and is moved up and down by using the cylinder 43 as a guide. A drain valve 32 provided with a pin 44 at the lower end so as to protrude into the inside and having a vertical groove 45 formed laterally is connected via a second check spring 30 so as to be vertically movable without detaching. ing. Operation piston 24
The manner of connection between the second check valve 28 and the drain valve 32 is merely an example, and various other methods are conceivable.
【００２５】排水弁３２は、シリンダ４３下端に形成さ
れた、シリンダ１１より小径の排水弁座３３に密着する
排水パッキン３４を装着し、その下端にガイド部４６を
設けている。３８は第２逆止弁２８に設けられた排水横
穴である。The drain valve 32 is provided with a drain packing 34 formed at the lower end of the cylinder 43 and in close contact with a drain valve seat 33 having a smaller diameter than the cylinder 11, and a guide portion 46 is provided at the lower end. Reference numeral 38 denotes a drain horizontal hole provided in the second check valve 28.
【００２６】図は停水状態を示しているが、この状態か
ら例えば凍結等により流出側配管内の圧力が上昇したと
きには、第２逆止弁２８が上昇し、ピン４４が縦溝４５
の上端に当接する。このとき、シリンダ１１が排水弁座
３３より大径を有しているため、水圧力により第２逆止
弁２８は、排水弁３２を排水弁座３３から離脱させて上
昇し、流出側配管内の異常圧力を排水口４から逃がすた
め、配管や継手類が破損するような事故は生じない。異
常圧力が解消すれば、再び排水弁３３は排水口４を閉塞
する。The figure shows a water-stop state. When the pressure in the outflow pipe rises from this state due to, for example, freezing or the like, the second check valve 28 rises, and the pin 44 moves into the vertical groove 45.
Abuts the top of At this time, since the cylinder 11 has a larger diameter than the drain valve seat 33, the second check valve 28 is lifted by releasing the drain valve 32 from the drain valve seat 33 due to the water pressure, and rises in the outflow side pipe. The abnormal pressure is released from the drain port 4, so that an accident such as breakage of pipes and joints does not occur. When the abnormal pressure is eliminated, the drain valve 33 closes the drain port 4 again.
【００２７】排水状態にするときは、操作ピストン２４
を上昇させれば良く、逆止環状パッキン４２がシリンダ
１１に密着したまま、流入側からの水を遮断し、排水弁
３２の排水パッキン３４が排水弁座３３から離脱して、
流出側配管内の水を、排水横穴３８、縦溝４５を経て、
排水口４から排出することになる。When the drainage state is set, the operating piston 24
The check ring is closed and the water from the inflow side is shut off while the check ring is kept in close contact with the cylinder 11, and the drain packing of the drain valve 32 is separated from the drain valve seat 33,
The water in the outflow side pipe is drained through the drain horizontal hole 38 and the vertical groove 45,
It will be discharged from the drain 4.
【００２８】図３の実施例においては、操作ピストン２
４の細径部４７下端に排水弁３２を一体にねじ接続し、
細径部４７に逆止ばね３０に押圧された第２逆止弁２８
を装着するようにしている。最下端のシリンダ４３はシ
リンダ１１より小径を有しており、排水弁３２に装着す
るＯリング状の排水パッキン３３が摺動するようにして
いる。In the embodiment shown in FIG.
4, the drain valve 32 is screwed integrally with the lower end of the small diameter portion 47,
The second check valve 28 pressed by the check spring 30 against the small diameter portion 47
Is to be worn. The lowermost cylinder 43 has a smaller diameter than the cylinder 11 so that the O-ring shaped drain packing 33 mounted on the drain valve 32 slides.
【００２９】第２逆止弁２８は、外周にシリンダ１１に
密着する逆止環状パッキン４２を、内面に細径部４７を
摺動する内側逆止環状パッキン４８を装着し、下端に切
り欠きを設け、排水路４９とする。The second check valve 28 is provided with a check ring 42 in close contact with the cylinder 11 on the outer periphery, an inner check ring 48 sliding on the small diameter portion 47 on the inner surface, and a notch in the lower end. The drainage channel 49 is provided.
【００３０】操作ピストン２４を下降させて排水状態に
するときは、まず、環状パッキン２６がシリンダ１１に
密着して流入側の水を遮断した後で、排水パッキン３３
がシリンダ４３から離脱して、流出側配管内の水を排水
口４から排出ことになる。流出側配管のヘッドが高いと
きは、水流により、第２逆止弁２８は逆止ばね３０を押
圧してシリンダ４３側に移動しようとするが、シリンダ
４３が小径なため、その上端に当接して停止し、下端に
穿った排水路４９により排水が妨げられることはない。When the operating piston 24 is lowered to a drain state, first, the annular packing 26 is brought into close contact with the cylinder 11 to block water on the inflow side, and then the drain packing 33 is moved.
Is released from the cylinder 43 and the water in the outflow-side pipe is discharged from the drain port 4. When the head of the outflow side pipe is high, the second check valve 28 pushes the check spring 30 to move toward the cylinder 43 due to the water flow, but because the cylinder 43 has a small diameter, it comes into contact with the upper end thereof. The drainage is not hindered by the drainage channel 49 formed at the lower end.
【００３１】なお、図示しないが、排水弁３２下端部
に、流出側圧力が一定圧以上になったとき、ばねを圧縮
して異常圧力を排水口４に逃がす、一種の安全弁を設け
れば、上述した凍結の事故を防止することができる。Although not shown, if a safety valve is provided at the lower end of the drain valve 32, a spring is compressed to release abnormal pressure to the drain port 4 when the outflow pressure exceeds a predetermined pressure. The above-mentioned freezing accident can be prevented.
【００３２】[0032]
【発明の効果】上述したように本発明においては、弁箱
の上流側に、内部を流水路とする逃し弁を収容し、流水
路末端の逆止弁座を第１逆止弁が閉塞するようにすると
ともに、その下流側の操作ピストンと排水弁間に第２逆
止弁を位置させる構造としたので、排水時、逆止弁の弁
体を別操作で解除する必要がなく、逆止性能に高い信頼
性を有する、非常にコンパクトでコストが安く、水の流
れに無理がないのでその分だけ損失水頭が小さくなると
いう利点の他に、水の落とし忘れによる凍結等で流出側
配管内の圧力が上昇したとき、異常圧力を排水口へ逃が
して、配管器具類を破損させない構造が容易に実現でき
るという、寒冷地で使用するに最も適した逃し弁付二重
逆止型ドレンバルブを提供できるものである。As described above, in the present invention, a relief valve having a flow passage inside is accommodated on the upstream side of the valve box, and the first check valve closes the check valve seat at the end of the flow passage. And the second check valve is located between the operation piston and the drain valve on the downstream side, so that it is not necessary to release the valve body of the check valve by a separate operation at the time of drainage. High reliability in performance, very compact, low cost, and reasonable flow of water, resulting in a smaller head loss. When the pressure rises, a double check type drain valve with a relief valve, which is most suitable for use in cold climates, can easily realize a structure that releases abnormal pressure to the drain port and does not damage piping equipment. It can be provided.
【図１】本発明の１実施例を示す、停水状態に於ける縦
断面図である。FIG. 1 is a longitudinal sectional view showing a water stop state according to an embodiment of the present invention.
【図２】本発明の他の実施例を示す、停水状態における
部分縦断面図である。FIG. 2 is a partial longitudinal sectional view showing a water stop state according to another embodiment of the present invention.
【図３】本発明のもう一つの実施例を示す、同じく停水
状態の部分縦断面図である。FIG. 3 is a partial longitudinal sectional view showing another embodiment of the present invention in the same water stopped state.
１ 弁箱 ２
流入口 ３ 流出口 ４
排水口 ５ 第１逆止弁室 ６
逃し弁室 ７ 第２逆止弁室 ８
排水室 ９ 逃し弁座 １０、１１
シリンダ １２ 第２逆止弁座 １３
連通路 １４ 逃し弁 １５
ダイヤフラム １６ ガイド体 １７
逃がしパッキン １８ ビス １９
流水路 ２０ 第１逆止弁座 ２１
第１逆止弁 ２２ 第１逆止パッキン ２３
ばね ２４ 操作ピストン ２５、２６
環状パッキン ２７ ガイド穴 ２８
第２逆止弁 ２９ 第２逆止パッキン ３０
逆止ばね ３１ 排水プラグ ３２
排水弁 ３３ 排水弁座 ３４
排水パッキン ３５ 排水シリンダ ３６
排水環状パッキン ３７ 排水ばね ３８
排水横穴 ３９ 小孔 ４０
操作軸 ４１ 駆動ボックス ４２
逆止環状パッキン ４３ シリンダ ４４
ピン ４５ 縦溝 ４６
ガイド部 ４７ 細径部 ４８
内側逆止環状パッキン ４９ 排水路1 valve box 2
Inlet 3 Outlet 4
Drain port 5 First check valve chamber 6
Relief valve chamber 7 Second check valve chamber 8
Drainage room 9 Relief valve seat 10, 11
Cylinder 12 Second check valve seat 13
Communication passage 14 Relief valve 15
Diaphragm 16 Guide body 17
Escape packing 18 Screw 19
Flow channel 20 First check valve seat 21
First check valve 22 First check packing 23
Spring 24 Operating piston 25, 26
Annular packing 27 Guide hole 28
2nd check valve 29 2nd check packing 30
Check spring 31 Drain plug 32
Drain valve 33 Drain valve seat 34
Drain packing 35 Drain cylinder 36
Drain ring packing 37 Drain spring 38
Drainage side hole 39 Small hole 40
Operation axis 41 Drive box 42
Non-return annular packing 43 Cylinder 44
Pin 45 Vertical groove 46
Guide part 47 Small diameter part 48
Inner non-return annular packing 49 Drainage channel
Claims (1)
弁座、第１逆止弁室、シリンダ、第２逆止弁室、流出口
を有し、下端部に、第１、第２逆止弁室からの水の排水
口を設ける弁箱と、内部に流水路を形成し、外周に流入
口からの圧力水を遮断する密封パッキンおよび逃し弁座
に密着する逃がしパッキンを装着するとともに、流水路
末端部に第１逆止弁座を形成する逃し弁と、第１逆止弁
室に収容され、ばねに押圧されて第１逆止弁座に密着す
る第１逆止弁と、シリンダ内を往復動する環状パッキン
を装着する操作ピストンと、操作ピストンと一体に、或
いは連動して、排水口を開閉する排水弁と、操作ピスト
ンと排水弁間の第２逆止弁室に収容される第２逆止弁と
を備えた逃し弁付二重逆止型ドレンバルブ。An inlet, a relief valve chamber, a relief valve seat, a first check valve chamber, a cylinder, a second check valve chamber, and an outlet are provided in this order from the upstream side. Equipped with a valve box provided with a drain port for water from the second check valve chamber, a sealing gasket that forms a flow channel inside and seals pressure water from the inflow port on the outer periphery, and a relief gasket that closely adheres to the relief valve seat. And a relief valve forming a first check valve seat at a terminal end of the water passage, and a first check valve housed in the first check valve chamber and pressed by a spring to come into close contact with the first check valve seat. An operating piston mounted with an annular packing that reciprocates in the cylinder, a drain valve that opens and closes a drain port integrally with or in conjunction with the operating piston, and a second check valve chamber between the operating piston and the drain valve A double check type drain valve with a relief valve provided with a second check valve housed in the drain valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21276697A JPH1151222A (en) | 1997-08-07 | 1997-08-07 | Double check type drain valve fitted with relief valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21276697A JPH1151222A (en) | 1997-08-07 | 1997-08-07 | Double check type drain valve fitted with relief valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1151222A true JPH1151222A (en) | 1999-02-26 |
Family
ID=16628052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21276697A Withdrawn JPH1151222A (en) | 1997-08-07 | 1997-08-07 | Double check type drain valve fitted with relief valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1151222A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839358A (en) * | 2010-04-29 | 2010-09-22 | 何际跃 | Gravity type backflow preventer |
| CN107355575A (en) * | 2017-07-27 | 2017-11-17 | 广东万家乐燃气具有限公司 | A kind of multifunctional safety valve |
-
1997
- 1997-08-07 JP JP21276697A patent/JPH1151222A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839358A (en) * | 2010-04-29 | 2010-09-22 | 何际跃 | Gravity type backflow preventer |
| CN107355575A (en) * | 2017-07-27 | 2017-11-17 | 广东万家乐燃气具有限公司 | A kind of multifunctional safety valve |
| CN107355575B (en) * | 2017-07-27 | 2023-02-03 | 广东万家乐燃气具有限公司 | Multifunctional safety valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20041102 |