第１ボディ部材１２の外筒部１２ａおよび第２ボディ部材１３間には環状の第１シール部材１６が介装され、第１ボディ部材１２の内筒部１２ｃ内に嵌合した第２ボディ部材１３の嵌合筒部１３ａおよび前記内筒部１２ｃ間には環状の第２シール部材１７が介装される。而して第１および第２ボディ部材１２，１３間には、第１ボディ部材１２の前記内筒部１２ｃで外周が規定されるようにして減圧室１８が形成され、該減圧室１８に通じる出口通路１９が、第１ボディ部材１２の側面から突出するようにして第１ボディ部材１２に取付けられる接続管２０および第１ボディ部材１２に設けられる。また第１ボディ部材１２の前記外筒部１２ａおよび前記内筒部１２ｃで外周および内周が規定される環状通路２１が第１および第２ボディ部材１２，１３間に形成され、前記減圧室１８内を加熱するための温水等の加熱媒体が前記環状通路２１内を流通する。
An annular first seal member 16 is interposed between the outer cylinder portion 12a of the first body member 12 and the second body member 13, and the second body member fitted into the inner cylinder portion 12c of the first body member 12. An annular second seal member 17 is interposed between the 13 fitting tube portions 13a and the inner tube portion 12c. Thus, a decompression chamber 18 is formed between the first and second body members 12 and 13 so that the outer periphery is defined by the inner cylindrical portion 12 c of the first body member 12, and communicates with the decompression chamber 18. An outlet passage 19 is provided in the connection pipe 20 and the first body member 12 that are attached to the first body member 12 so as to protrude from the side surface of the first body member 12. An annular passage 21 having an outer periphery and an inner periphery defined by the outer cylinder portion 12 a and the inner cylinder portion 12 c of the first body member 12 is formed between the first and second body members 12, 13, and the decompression chamber 18. A heating medium such as hot water for heating the inside flows through the annular passage 21.
ところで前記減圧用弁体１０は、図２で示すように、前記減圧用弁座２５から前記減圧用弁体１０が離座した開弁位置と、図３で示すように、前記減圧用弁座２５に前記減圧用弁体１０が着座した閉弁位置との間で移動可能である。前記ハウジング２８の小径円筒部２８ｃおよび端壁部２８ｄと、前記弁軸２７および前記減圧用弁体１０との間には、前記弁室３１との間が第５シール部材３２でシールされるようにして背圧室３５が形成され、この背圧室３５は前記弁軸２７に設けられる連通路３６を介して前記減圧室１８に連通する。
By the way, the pressure reducing valve body 10 includes a valve opening position where the pressure reducing valve body 10 is separated from the pressure reducing valve seat 25 as shown in FIG. 2, and a pressure reducing valve seat as shown in FIG. 25, and can be moved between the valve closing position where the pressure reducing valve body 10 is seated. A small-diameter cylindrical portion 28c and end wall portion 28d of the housing 28, between the valve shaft 27 and the pressure-reducing valve body 10, between the valve chamber 31 is sealed by the fifth sealing member 32 Thus, a back pressure chamber 35 is formed, and the back pressure chamber 35 communicates with the decompression chamber 18 through a communication passage 36 provided in the valve shaft 27.
しかも大径部６５ｂの一端は、前記ハウジング２８における保持部２８ａに第２内向き鍔部１３ｂとは反対側から当接するものであり、ガイド筒６５は第２内向き鍔部１３ｂとの間に前記ハウジング２８を挟持するようにして第２ボディ部材１３に固定されることになり、前記嵌合孔部１５ｂの内周に弾発的に接触する環状の第９シール部材７６および第２バックアップリング７７が、前記大径部６５ｂの外周に装着される。
Moreover, one end of the large-diameter portion 65b contacts the holding portion 28a of the housing 28 from the side opposite to the second inward flange 13b, and the guide tube 65 is between the second inward flange 13b. the would be fixed to the second body member 13 so as to sandwich the housing 28, the ninth seal member 76 and the second bar ring to elastically contact the inner periphery of the fitting hole 15b Tsu A cup-up ring 77 is attached to the outer periphery of the large-diameter portion 65b.
前記遮断用弁体７８における鍔部７８ｂには、前記ハウジング２８における保持部２８ａの第２内向き鍔部１３ｂとは反対側の面に対向するように環状の第１ゴムシール８１が埋設され、その第１ゴムシール８１を着座可能とした遮断用弁座８２が、前記ボディ５の第２ボディ部材１３とは別体にして第２ボディ部材１３に固定される別部材、この実施の形態ではハウジング２８に形成されるものであり、ハウジング２８の保持部２８ａに第１ゴムシール８１を着座させるようにして環状に突出した遮断用弁座８２が形成される。
An annular first rubber seal 81 is embedded in the flange portion 78b of the shut-off valve body 78 so as to face the surface of the holding portion 28a of the housing 28 opposite to the second inward flange portion 13b. The shut-off valve seat 82 that allows the first rubber seal 81 to be seated is a separate member that is fixed to the second body member 13 separately from the second body member 13 of the body 5, in this embodiment the housing 28. The shut-off valve seat 82 is formed so as to project in an annular shape so that the first rubber seal 81 is seated on the holding portion 28a of the housing 28.
前記遮断用弁体７８および前記副弁体７９の一方、この実施の形態では前記副弁体７９に遮断用弁体７８および副弁体７９の中心軸線と同軸の凹部９０が設けられ、その凹部９０に挿入される挿入部９１が前記遮断用弁体７８および前記副弁体７９の他方、この実施の形態では遮断用弁体７８に設けられ、遮断用弁体７８の段付き円筒部７８ａの一部および前記端壁部７８ｃが前記挿入部９１として前記凹部９０に挿入される。而して副弁体７９および遮断用弁体７８間にはパイロット弁室９２が形成され、入口通路８４に環状凹部８３を介して通じている第１連通孔８６…を前記パイロット弁室９２に通じさせる第１通路９３が前記ガイド筒６５および前記遮断用弁体７８間に形成され、ハウジング２８および前記遮断用弁体７８間には、前記弁室３１に通じる第２連通孔８７…を前記パイロットポート８０に通じさせる第２通路９４が形成される。
One of the shut-off valve body 78 and the sub-valve body 79, in this embodiment, the sub-valve body 79 is provided with a recess 90 coaxial with the central axis of the shut-off valve body 78 and the sub-valve body 79. An insertion portion 91 inserted into 90 is provided on the other side of the shutoff valve body 78 and the subvalve body 79, in this embodiment on the shutoff valve body 78, and the stepped cylindrical portion 78a of the shutoff valve body 78 and part the end wall portion 78c is inserted into the recess 90 as the pre-Symbol insertion portion 91. Thus, a pilot valve chamber 92 is formed between the sub-valve element 79 and the shutoff valve element 78, and a first communication hole 86... Communicating with the inlet passage 84 through the annular recess 83 is provided in the pilot valve chamber 92. A first passage 93 to be communicated is formed between the guide cylinder 65 and the shut-off valve body 78, and a second communication hole 87 communicating with the valve chamber 31 is formed between the housing 28 and the shut-off valve body 78. A second passage 94 communicating with the pilot port 80 is formed.
前記凹部９０の内周および前記挿入部９１の外周の一方、この実施の形態では前記挿入部９１の外周に設けられる環状溝９７に、外力の作用に応じて拡縮するように弾性変形し得るＣ形のリング９８が外力の非作用時には前記環状溝９７から外側方に一部を突出させるようにして装着される。また前記凹部９０の内周および前記挿入部９１の外周の他方、この実施の形態では前記凹部９０の開口端内周に、前記挿入部９１を前記凹部９０に挿入して前記遮断用弁体７８および前記副弁体７９を相互に組付ける際に前記外力を前記リング９８に加えて該リング９８を乗り越える係合突起９９が、半径方向内方に突出するようにして突設される。
One of the inner periphery of the recess 90 and the outer periphery of the insertion portion 91, in this embodiment, an annular groove 97 provided on the outer periphery of the insertion portion 91 can be elastically deformed so as to expand and contract in response to the action of external force. A ring 98 having a shape is mounted so that a part protrudes outward from the annular groove 97 when no external force is applied. The inner periphery and the outer periphery of the other of the insertion portion 91 of the recess 90, the inner periphery of the open end of the recess 90 in the implementation form of this, the shut-off valve by inserting the insertion portion 91 into the recess 90 When the body 78 and the sub-valve body 79 are assembled to each other, an engaging protrusion 99 is applied so as to protrude radially inward by applying the external force to the ring 98 and overcoming the ring 98.