JPH10195941A - Back flow prevention type antifreeze faucet - Google Patents
Back flow prevention type antifreeze faucetInfo
- Publication number
- JPH10195941A JPH10195941A JP279797A JP279797A JPH10195941A JP H10195941 A JPH10195941 A JP H10195941A JP 279797 A JP279797 A JP 279797A JP 279797 A JP279797 A JP 279797A JP H10195941 A JPH10195941 A JP H10195941A
- Authority
- JP
- Japan
- Prior art keywords
- packing
- piston
- water stop
- ring
- water
- 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- Withdrawn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)
- Details Of Valves (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、施工時の耐圧試験
を簡単な操作で出きるとともに、排水時に、蛇口を閉じ
たままでもハンドル操作が容易に行えるようにした、弁
座を有する逆流防止型不凍給水栓に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backflow prevention device having a valve seat which allows a pressure test at the time of construction to be completed by a simple operation, and allows a handle operation to be easily performed even when a faucet is closed during drainage. Type antifreeze hydrant.
【0002】[0002]
【従来の技術】従来、不凍給水栓の施工時には、配管内
の耐圧試験を行うため、流出側配管末端の蛇口から水を
流しながら配管内の空気を出し、上流側の止水栓を閉じ
てから蛇口をはずして圧力計を付け、テストポンプで水
圧をかけて止水栓までの漏水がないかを圧力計で確認す
る。しかし、通常の不凍給水栓の場合は問題ないが、逆
流防止弁を組み込んだ不凍給水栓においては、逆流防止
弁が作動して不凍給水栓から上流側、すなわち1次側の
引き込み管内には圧力がかからず、耐圧試験をすること
ができない。従って、例えば、ピストンを引き抜いて耐
圧専用のピストンを代わりに挿入して試験しなければな
らない等、大変な手間がかかっていた。2. Description of the Related Art Conventionally, when constructing an antifreeze water tap, in order to perform a pressure test in the pipe, air is discharged from the pipe while flowing water from a faucet at the end of the pipe on the outflow side, and the water stopcock on the upstream side is closed. Then remove the faucet, attach a pressure gauge, apply water pressure with the test pump, and check with the pressure gauge whether there is any water leakage to the stopcock. However, although there is no problem in the case of a normal antifreeze hydrant, in the case of an antifreeze hydrant incorporating a check valve, the check valve operates to move upstream from the antifreeze hydrant, that is, into the primary-side inlet pipe. Is not subjected to pressure, and a pressure test cannot be performed. Therefore, for example, the piston has to be pulled out, and a piston dedicated to pressure resistance must be inserted and tested instead.
【0003】それとは別に、水抜き時、蛇口を閉じたま
まハンドル操作を行うと、やはり逆流防止弁が作動して
2次側の圧力水は1次側に逃げず、そのため下降時のピ
ストンに過大な上昇圧力が作用し、ハンドル操作が非常
に重くなる、あるいはハンドル操作が途中で出来なくな
り、凍結の原因にもなっていた。[0003] Separately, at the time of draining, if the handle is operated with the faucet closed, the check valve is also activated and the secondary side pressure water does not escape to the primary side. Excessive rising pressure was applied, and the handle operation became very heavy, or the handle operation could not be performed halfway, causing freezing.
【0004】[0004]
【発明が解決しようとする課題】そのため本発明は、上
記公知例の有する欠陥を完全に除去し、簡単な操作をす
ることにより、2次側蛇口部分からテストポンプで耐圧
検査できる、しかも、蛇口を閉じたままでも正常にハン
ドル操作可能な、特に弁座を有する逆流防止型不凍給水
栓を提供することを目的とする。SUMMARY OF THE INVENTION Therefore, according to the present invention, it is possible to completely remove the defects of the above-mentioned known examples and to perform a simple operation, so that the pressure resistance test can be performed with a test pump from the secondary tap. It is an object of the present invention to provide a backflow-prevention type antifreeze water tap having a valve seat, which can normally operate the handle even with the valve closed.
【0005】[0005]
【課題を解決するための手段】上記目的を達成するため
本発明は、弁箱の弁座とその上方の流出口間に止水シリ
ンダを、流出口の上方に上記止水シリンダと同径の排水
シリンダを設け、上記シリンダに密着する止水環状パッ
キンと排水環状パッキンを装着するピストン下方部に、
下端部に逆止環状パッキンにより逆流を防止する封止部
を、その上方に圧力導入部を設ける細径部を形成し、上
記細径部外周に、下端に上記弁座を閉塞する逆止駒パッ
キンを装着し、逆止ばねにより常に下向きに押圧される
逆止弁体を上下動自在に連結してなるもので、耐圧検査
するときは、不凍給水栓のハンドルを閉栓方向に一定角
度回転させてピストンを下降し、封止部と逆止弁体の密
封を解除させて2次側からの圧力を上記圧力導入部から
1次側に逃がすようにすると共に、ピストンの上記両環
状パッキンに逆向きに等しい圧力を作用させて、流出口
下流側配管内の圧力上昇を抑えるようにしたものであ
る。In order to achieve the above object, the present invention provides a water stop cylinder between a valve seat of a valve box and an outlet above the valve seat, and a water stop cylinder having the same diameter as the water stop cylinder above the outlet. A drain cylinder is provided, and at the lower part of the piston where the water-tight annular packing and the drain annular ring are attached in close contact with the cylinder,
A non-return piece for forming a sealing portion at the lower end to prevent backflow by a non-return annular packing, forming a small-diameter portion above the pressure-introducing portion, and closing the valve seat at the lower end on the outer periphery of the small-diameter portion. It is equipped with a packing, and a check valve that is constantly pressed downward by a check spring is connected movably up and down.When performing a pressure test, the handle of the antifreeze water tap is rotated by a fixed angle in the closing direction. Then, the piston is lowered to release the sealing of the sealing portion and the check valve body so that the pressure from the secondary side is released from the pressure introducing portion to the primary side. The same pressure is applied in the opposite direction to suppress an increase in the pressure in the pipe downstream of the outlet.
【0006】[0006]
【発明の実施の形態】本発明は、基本的に止水時には逆
止駒パッキンを弁座に押圧させて止水するようにしてお
り、そのときにはピストンと封止部間は密封されていな
いため、ピストンと逆止弁体間にOリングを使用した止
水パッキンを装着するようにしているが、これは止水パ
ッキンをピストンに装着せず、逆止弁体側に装着しても
よく、Oリングの代わりに駒パッキンを用いても良い。
さらに、逆止駒パッキンを逆流防止にのみ使用し、止水
環状パッキンで止水することも可能であり、その時には
止水パッキンは不要となる。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, basically, at the time of stopping water, a check piece packing is pressed against a valve seat to stop water. At that time, the space between the piston and the sealing portion is not sealed. Although a watertight packing using an O-ring is mounted between the piston and the check valve body, this may be mounted on the check valve body side without mounting the watertight packing on the piston. A piece packing may be used instead of the ring.
Further, it is also possible to use the non-return piece packing only for preventing backflow, and to stop the water with the water-stop ring packing. In that case, the water-stop packing becomes unnecessary.
【0007】圧力導入部は円筒の一部を縦方向に抉った
形状を有しているが、これは細径部を逆止弁体のガイド
としているためであり、例えば、弁箱の止水シリンダと
弁座間に数個のガイド壁を設けるなど別体にガイドを設
ければ、圧力導入部全体を封止部より細径の円筒にする
ことができ、また、ピストン内部に段差を設け、封止部
に逆止環状パッキンを装着することもできる。 逆止環
状パッキンには、Yパッキン等の一方向密封性パッキン
を使用すれば、摺動抵抗が少なくて済むので圧力の低い
地域においても摩擦力により水が出なくなる等の恐れが
無く、有利ではあるが、設計によっては通常のOリング
を使用することも可能である。The pressure introducing portion has a shape in which a part of the cylinder is hollowed out in the vertical direction. This is because the small diameter portion serves as a guide for the check valve body. If a guide is provided separately such as providing several guide walls between the cylinder and the valve seat, the entire pressure introducing section can be made a cylinder having a smaller diameter than the sealing section, and a step is provided inside the piston, A non-return annular packing can be attached to the sealing portion. If a one-way sealing packing such as Y packing is used for the check annular packing, there is no danger that water will not come out due to frictional force even in an area where pressure is low, since there is little sliding resistance. However, depending on the design, it is also possible to use a normal O-ring.
【0008】ピストンと逆止弁体の連結態様は、実施例
のものにおいては、細径部下端を、逆止弁体を挿入した
後で強制的に外方に拡開して逆止弁体が離脱しないよう
にしているが、これは例えば下端に大径の段部を有する
細径部をピストンにねじ接続するとか、Oリングや端部
を切り離した金属製の弾性環を抜け止め部材として装着
するとか、種々の方法があり、いずれにしても、逆止弁
体の上下動に支障を来さず、ピストン引き抜き時、逆止
弁体がピストンから離脱しないようなものであればよ
い。In the embodiment, the connection between the piston and the check valve body is such that the lower end of the small-diameter portion is forcibly expanded outward after the check valve body is inserted after the check valve body is inserted. It does not come off, but this can be done, for example, by screwing a small diameter part having a large diameter step at the lower end to the piston, or by using an O-ring or a metal elastic ring with the end cut off as a retaining member There are various mounting methods, and any method may be used as long as it does not hinder the vertical movement of the check valve and does not separate the check valve from the piston when the piston is pulled out.
【0009】[0009]
【実施例】実施例について図面を参照して説明すると、
図1において、1は弁箱であり、側壁下方に流入口2
を、その上方に流出口3を、さらにその上方に排水口4
を設けている。内部には、流入口2と流出口3間に上向
きの弁座5と、その上方に止水シリンダ6を設け、流出
口3の上方に、排水口4を挟んで、止水シリンダ6と同
径の排水シリンダ7、8を設けている。Embodiments will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a valve box, and an inlet 2 is provided below the side wall.
Above the outlet 3 and further above the drain 4
Is provided. Inside, an upwardly facing valve seat 5 is provided between the inflow port 2 and the outflow port 3 and a water stop cylinder 6 is provided above the valve seat 5. Drain cylinders 7 and 8 having a diameter are provided.
【0010】9はピストンであり、外周に排水環状パッ
キン10、11、止水環状パッキン12を装着し、その
下方に止水パッキン13を下方に離脱しないよう、アリ
溝を設けて装着し、さらにその下方に細径部14を形成
する。細径部14には、中間部に一端を縦長に深く抉っ
た圧力導入部15と、その下方に円筒の封止部16と、
下端に全体をわずかに外方に拡開した抜け止め部17を
設けている。Reference numeral 9 denotes a piston. Drain annular packings 10 and 11 and a waterproof ring packing 12 are mounted on the outer periphery, and a dovetail groove is provided below the waterproof packing 13 so that the waterproof seal 13 is not detached downward. The small diameter portion 14 is formed below it. In the small-diameter portion 14, a pressure introducing portion 15 whose one end is vertically deeply deepened in an intermediate portion, a cylindrical sealing portion 16 below the pressure introducing portion 15,
At the lower end, a retaining portion 17 is provided which is slightly widened outward.
【0011】18は逆止弁体であり、上端に止水部19
を形成し、下端に止水駒パッキン20を、内部に逆止環
状パッキン21を装着し、ピストン9に係止された逆止
ばね22により常に下方向の押圧力を受けている。Reference numeral 18 denotes a check valve, which is provided at its upper end with a water stop portion 19.
, A watertight block packing 20 is mounted on the lower end, and a non-return annular packing 21 is mounted inside, and a downward pressing force is constantly received by a non-return spring 22 locked to the piston 9.
【0012】弁箱1はパイプ23により上方に延長され
て地上の操作部本体(図示せず)に接続、固定され、ピ
ストン9はロッド24により上方に延長されて、やはり
図示しないが地上の操作桿を介してハンドルに連結され
る。The valve box 1 is extended upward by a pipe 23 and connected to and fixed to an operation unit main body (not shown) on the ground, and the piston 9 is extended upward by a rod 24. It is connected to the handle via the rod.
【0013】図は不凍給水栓が開栓で、水を流していな
い停水状態を示しているが、流出口3下流側配管末端に
設けた蛇口(図示せず)を開くと、流入口2からの水は
逆止ばね22を圧縮し、逆止弁体18を細径部14に沿
って上昇させ、通水状態となる。停水状態、あるいは出
水状態から断水等により本管側に負圧が発生して流入口
2側の圧力が低下したときには、逆止ばね22の復元力
により、逆止弁体18は直ちに下降して弁座5に着座
し、また、逆止環状パッキン21が封止部16に密着し
て、流出口3側配管内の水の流入口2側への逆流を防止
する。The figure shows a water stop state in which the antifreeze water tap is opened and water is not flowing, but when a faucet (not shown) provided at the end of the downstream pipe of the outlet 3 is opened, the inlet is opened. The water from 2 compresses the check spring 22 and raises the check valve 18 along the small-diameter portion 14 to enter a water-permeable state. When a negative pressure is generated on the main pipe side due to water cutoff or the like from a water stop state or a water discharge state and the pressure on the inflow port 2 side decreases, the check valve element 18 immediately descends due to the restoring force of the check spring 22. The check annular packing 21 is tightly attached to the sealing portion 16 to prevent the water in the pipe on the outlet 3 side from flowing back to the inlet 2 side.
【0014】次に設置時、蛇口側から止水栓までテスト
ポンプで耐圧試験をするときは、ハンドル(図面省略)
を回転させて、ピストン9を一定距離下降させた図2の
状態で耐圧試験をすればよい。即ち、排水環状パッキン
11が排水シリンダ7に密着したまま、止水環状パッキ
ン12が未だ止水シリンダ6に密着せず、逆止環状パッ
キン21が封止部16から圧力導入部15外方に離脱し
た状態になっているため、ピストン9と止水シリンダ
6、逆止弁体18内径と封止部16の間隙を適度に有せ
しめておけば、蛇口側からテストポンプで加えられた圧
力は圧力導入部15を通ってそのまま止水栓まで達する
ことになる。Next, at the time of installation, a handle (not shown) is used when a pressure test is performed from the faucet side to the water stopcock with a test pump.
Is rotated, and the pressure resistance test may be performed in the state of FIG. 2 in which the piston 9 is lowered by a certain distance. That is, while the annular drainage packing 11 is in close contact with the drainage cylinder 7, the watertight annular packing 12 is not yet in close contact with the watertight cylinder 6, and the check annular packing 21 is detached from the sealing portion 16 to the outside of the pressure introducing portion 15. If the gap between the piston 9 and the water stopping cylinder 6 and the inner diameter of the check valve 18 and the sealing portion 16 is appropriately provided, the pressure applied by the test pump from the faucet side is equal to the pressure. Through the introduction section 15, the water reaches the water stopcock as it is.
【0015】この時、操作桿に予め目印を付けておい
て、目視でハンドルをその位置まで下降させても良い
し、あるいは、操作桿にスペーサーをはめ込み、スペー
サーが操作部本体上端に当接するまで下降させるように
しても良く、いずれにしても、耐圧検査を容易に行うこ
とができる。At this time, the operating rod may be marked in advance and the handle may be visually lowered to that position, or the spacer may be fitted into the operating rod until the spacer comes into contact with the upper end of the operating section body. In this case, the withstand voltage test can be easily performed.
【0016】排水状態にするときは、図2の状態からさ
らにピストン9を下降させていけば良く、まず止水環状
パッキン12が止水シリンダ6に密着して流入口2から
の水を遮断し、さらに下降して排水環状パッキン11が
排水シリンダ7から離脱して、流出側配管内の水は排水
口4を通り、地中に排出される。つまり、流入口2側か
らの水が直接排水口4側に流れる、いわゆる同時漏水は
生じない。最終的には逆止駒パッキン20が弁座5に密
着した状態で、止水パッキン13が逆止弁体18の止水
部19に当接してピストンは下降を停止する。即ち排水
状態では、止水環状パッキン12と、逆止駒パッキン2
0と、止水パッキン13とで流入口2からの水を止めて
いることになる。When the drainage state is set, the piston 9 may be further lowered from the state shown in FIG. 2. First, the water-stop annular packing 12 comes into close contact with the water-stop cylinder 6 to shut off water from the inflow port 2. Further, the drainage annular packing 11 separates from the drainage cylinder 7 and water in the outflow side pipe passes through the drainage port 4 and is discharged into the ground. That is, so-called simultaneous water leakage, in which water from the inflow port 2 flows directly to the drain port 4 side, does not occur. Finally, with the check piece packing 20 in close contact with the valve seat 5, the water stop packing 13 contacts the water stop portion 19 of the check valve body 18, and the piston stops descending. That is, in the drained state, the annular ring packing 12 and the check piece packing 2
That is, the water from the inflow port 2 is stopped by 0 and the water stop packing 13.
【0017】このとき排水環状パッキン10が排水シリ
ンダ8に密着しているため、パイプ23内に水が上昇す
ることもないが、水が上昇しても構わないという時は、
排水シリンダ8および排水環状パッキン10を省略して
も良い。At this time, since the annular drainage packing 10 is in close contact with the drainage cylinder 8, the water does not rise in the pipe 23.
The drain cylinder 8 and the drain annular packing 10 may be omitted.
【0018】蛇口を閉じた状態、すなわち逆止駒パッキ
ン20が弁座5に密着した状態でピストン9を下降させ
ていった場合は、逆止環状パッキン21が封止部16か
ら離脱するまでの間の流出口下流側配管内の水の圧縮は
生じるが、わずかな距離の間の圧縮であり、離脱した後
は、圧縮水は圧力導入部15から流入口2側に逃げ、ま
た、止水シリンダ6と排水シリンダ7は同径を有してい
るため、止水環状パッキン12が止水シリンダ6に密着
してから、排水環状パッキン11が排水シリンダ7より
離脱するまでの圧縮もなく、ハンドル操作はスムーズな
ものになる。If the faucet is closed, that is, if the check piece packing 20 is in close contact with the valve seat 5, and the piston 9 is lowered, the check annular packing 21 is removed until the check ring 21 is detached from the sealing portion 16. Although the compression of water in the downstream piping downstream from the outlet occurs during a short distance, the compressed water escapes from the pressure introducing portion 15 to the inlet 2 side after the separation, and the water stops. Since the cylinder 6 and the drainage cylinder 7 have the same diameter, there is no compression until the drainage annular packing 11 comes off from the drainage cylinder 7 after the watertight annular packing 12 comes into close contact with the watertight cylinder 6, and the handle The operation becomes smooth.
【0019】パッキンの事故等により、ピストン9をパ
イプ23から引き抜くときは、抜け止め部17に係止さ
れて逆止弁体18は離脱することはない。When the piston 9 is pulled out of the pipe 23 due to a packing accident or the like, the check valve 18 is not detached because it is locked by the retaining portion 17.
【0020】[0020]
【発明の効果】上述したように本発明の不凍給水栓にあ
っては、設置時にテストポンプで蛇口から止水栓まで耐
圧検査をするとき、操作桿を予め決められたわずかな距
離下降させるだけで良く、いちいちピストンを引き抜い
て耐圧専用のピストンを代わりに挿入しなければならな
い、等の手間がかからず、さらに、蛇口を閉じたまま止
水状態にしていっても圧力上昇をわずかに抑えることが
でき、ハンドル操作に不都合を生じない、という効果を
有している。As described above, in the antifreeze water tap according to the present invention, when the pressure resistance test is performed from the faucet to the water stopcock with the test pump at the time of installation, the operation rod is lowered by a predetermined small distance. Only need to pull out the piston and insert a pressure-resistant piston instead.Even if there is no trouble, and even if the faucet is closed and the water is shut off, the pressure rise will be slight. This has the effect that the steering operation can be suppressed and no inconvenience occurs in the operation of the steering wheel.
【図1】本発明の1実施例を示す、停水状態における縦
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】図1の耐圧試験時に於けるピストンの状態を示
す縦断面図である。FIG. 2 is a longitudinal sectional view showing a state of a piston during a pressure resistance test of FIG.
1 弁箱 2 流入口 3 流出口 4 排水口 5 弁座 6 止水シリンダ 7、8 排水シリンダ 9 ピストン 10、11 排水環状パッキン 12 止水環状パッキン 13 止水パッキン 14 細径部 15 圧力導入部 16 封止部 17 抜け止め部 18 逆止弁体 19 止水部 20 逆止駒パッキン 21 逆止環状パッキン 22 逆止ばね 23 パイプ 24 ロッド DESCRIPTION OF SYMBOLS 1 Valve box 2 Inflow port 3 Outlet port 4 Drain port 5 Valve seat 6 Water stop cylinder 7, 8 Drain cylinder 9 Piston 10, 11 Drain ring packing 12 Water stop ring packing 13 Water stop packing 14 Small diameter part 15 Pressure introduction part 16 Sealing part 17 Retaining part 18 Check valve 19 Water stopping part 20 Check piece packing 21 Check ring packing 22 Check spring 23 Pipe 24 Rod
Claims (1)
を、内部には、上記流入口、流出口間に上向きの弁座及
びその上方の止水シリンダを、流出口と排水口間に上記
シリンダと同径の排水シリンダをそれぞれもうける弁箱
と、上記両シリンダを摺動する止水環状パッキンと排水
環状パッキンを装着し、上記止水環状パッキンの下方
に、下端部に逆止環状パッキンにより逆流を防止する封
止部を、その上方に圧力導入部を設けた細径部を形成す
るピストンと、上記細径部外周に上下動自在に連結さ
れ、下端に上記弁座を閉塞する逆止駒パッキンを装着す
る逆止弁体と、ピストンに係止され、逆止弁体を下向き
に押圧する逆止ばねとからなる逆流防止型不凍給水栓。1. An inflow port, an outflow port, and a drain port in order from the bottom on the side wall, and an upward valve seat between the inflow port and the outflow port and a water stop cylinder above the inflow port, an outflow port and a drain port. A valve box with a drain cylinder of the same diameter as the cylinder above, and a watertight annular packing and a drainage annular packing that slide on both cylinders are attached, and below the watertight annular packing, check at the lower end. A sealing portion for preventing backflow by an annular packing is connected to a piston forming a small diameter portion provided with a pressure introducing portion above the sealing portion, and the outer periphery of the small diameter portion is vertically movably connected, and the valve seat is closed at a lower end. A non-returnable antifreeze water tap comprising a check valve body fitted with a check piece packing and a check spring engaged with the piston and pressing the check valve downward.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP279797A JPH10195941A (en) | 1997-01-10 | 1997-01-10 | Back flow prevention type antifreeze faucet |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP279797A JPH10195941A (en) | 1997-01-10 | 1997-01-10 | Back flow prevention type antifreeze faucet |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH10195941A true JPH10195941A (en) | 1998-07-28 |
Family
ID=11539374
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP279797A Withdrawn JPH10195941A (en) | 1997-01-10 | 1997-01-10 | Back flow prevention type antifreeze faucet |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH10195941A (en) |
-
1997
- 1997-01-10 JP JP279797A patent/JPH10195941A/en not_active Withdrawn
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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: 20040406 |