JP5551038B2

JP5551038B2 - Valve device

Info

Publication number: JP5551038B2
Application number: JP2010217387A
Authority: JP
Inventors: 直樹窪田; 秀樹斎藤
Original assignee: Eagle Industry Co Ltd
Current assignee: Eagle Industry Co Ltd
Priority date: 2010-09-28
Filing date: 2010-09-28
Publication date: 2014-07-16
Anticipated expiration: 2030-09-28
Also published as: JP2012073767A

Description

本発明は弁装置であって、例えば電気温水機などの給水配管に好適に用いられるものに関する。 The present invention relates to a valve device that is suitably used for water supply piping such as an electric water heater.

この種の弁装置として、従来、例えば図１６に示されるようなものが知られている。すなわち図１６に示される弁装置は、ボディ１００と、弁機構部１１０と、第二弁機構部１２０を備え、このうちボディ１００には、上流側である一次側通路１０１と、下流側である二次側通路１０２と、これら一次側通路１０１と二次側通路１０２の間に形成されたシリンダ部１０３と、このシリンダ部１０３と対向する位置で前記一次側通路１０１と二次側通路１０２の間を連通する弁孔１０４が形成されている。 As this type of valve device, for example, the one shown in FIG. 16 is known. That is, the valve device shown in FIG. 16 includes a body 100, a valve mechanism portion 110, and a second valve mechanism portion 120, and the body 100 includes a primary passage 101 on the upstream side and a downstream side. A secondary side passage 102, a cylinder portion 103 formed between the primary side passage 101 and the secondary side passage 102, and the primary side passage 101 and the secondary side passage 102 at positions facing the cylinder portion 103. A valve hole 104 communicating therewith is formed.

弁機構部１１０は、ボディ１００のシリンダ部１０３及び弁孔１０４を貫通するように配置された弁ロッド１１１と、この弁ロッド１１１に一体に形成され前記シリンダ部１０３の内周面にパッキン１１３を介して摺動可能に密嵌されたピストン１１２と、前記弁ロッド１１１の端部に螺子部１１５を介して結合され二次側通路１０２側から弁孔１０４を開閉する弁体１１４と、弁ロッド１１１における弁体１１４と反対側の端部（ピストン１１２の端部）に螺子部１１６によって結合され、二次側通路１０２の水圧によって弁体１１４を弁孔１０４に対する接近方向へ付勢するダイアフラム１１７と、弁体１１４を弁孔１０４に対する離間方向へ付勢するスプリング１１８からなる。 The valve mechanism 110 includes a valve rod 111 disposed so as to penetrate the cylinder portion 103 and the valve hole 104 of the body 100, and a packing 113 formed integrally with the valve rod 111 on the inner peripheral surface of the cylinder portion 103. A piston 112 slidably fitted through the valve rod 111, a valve body 114 coupled to the end of the valve rod 111 via a screw portion 115 to open and close the valve hole 104 from the secondary passage 102 side, and a valve rod A diaphragm 117 that is coupled to an end portion of 111 opposite to the valve body 114 (end portion of the piston 112) by a screw portion 116 and biases the valve body 114 in the approaching direction with respect to the valve hole 104 by the water pressure of the secondary side passage 102. And a spring 118 that urges the valve body 114 in a direction away from the valve hole 104.

第二弁機構部１２０は、一次側通路１０１とダイアフラム１１７側との間を連通する連通孔１０５を開閉する第二弁体１２１と、この第二弁体１２１を連通孔１０５に対する接近方向へ付勢する第二スプリング１２２からなり、一次側通路１０１の水圧が、第二弁体１２１を連通孔１０５から離間させる方向へ作用するものである。 The second valve mechanism 120 includes a second valve body 121 that opens and closes the communication hole 105 that communicates between the primary passage 101 and the diaphragm 117 side, and the second valve body 121 is attached to the communication hole 105 in an approaching direction. The second spring 122 is energized, and the water pressure in the primary passage 101 acts in the direction of separating the second valve body 121 from the communication hole 105.

そしてこの弁装置は、何らかの要因により二次側通路１０２の水圧が上昇した場合、この水圧を受けるダイアフラム１１７がスプリング１１８を圧縮する方向へ変位して、このダイアフラム１１７に結合された弁ロッド１１１を介して弁体１１４を閉弁方向へ変位させるので、弁孔１０４から二次側通路１０２への流路面積が減少して圧力損失が増加し、二次側通路１０２の水圧を所定値以下に維持するものである。 When the water pressure in the secondary passage 102 rises for some reason, the valve device displaces the diaphragm 117 receiving the water pressure in the direction in which the spring 118 is compressed, and the valve rod 111 coupled to the diaphragm 117 is moved. Therefore, the valve body 114 is displaced in the valve closing direction, so that the flow passage area from the valve hole 104 to the secondary side passage 102 decreases, the pressure loss increases, and the water pressure in the secondary side passage 102 is reduced to a predetermined value or less. To maintain.

また、弁機構部１１０における弁体１１４が弁孔１０４を閉塞することによって一次側通路１０１と二次側通路１０２の間を遮断した状態で、一次側通路１０１の水圧が所定値を超えて上昇した場合、この水圧によって、第二弁機構部１２０が開弁動作して一次側通路１０１と二次側通路１０２を連通させるので、一次側通路１０１の水圧を開放して減圧することができるようになっている（例えば下記の特許文献１参照）。 Further, the water pressure of the primary side passage 101 rises above a predetermined value in a state where the valve body 114 in the valve mechanism section 110 closes the valve hole 104 to block between the primary side passage 101 and the secondary side passage 102. In this case, the water pressure causes the second valve mechanism 120 to open and connect the primary side passage 101 and the secondary side passage 102, so that the water pressure in the primary side passage 101 can be released and reduced. (For example, see Patent Document 1 below).

特開２００８−１８６１０６号公報JP 2008-186106 A

しかしながら、この種の弁装置は、第二弁機構部１２０を有するために部品数が多く、構造も複雑なものとなっていた。 However, since this type of valve device has the second valve mechanism 120, the number of parts is large and the structure is complicated.

本発明は、以上のような点に鑑みてなされたものであって、その技術的課題は、弁機構部のほかに第二弁機構部を設けることなく、一次側通路の圧力が所定値を超えて上昇した場合に二次側へ圧力を逃がすことの可能な構造とすることにある。 The present invention has been made in view of the above points, and its technical problem is that the pressure in the primary passage has a predetermined value without providing the second valve mechanism in addition to the valve mechanism. The purpose of the structure is to allow the pressure to escape to the secondary side when the pressure rises beyond the limit.

上述した技術的課題を有効に解決するための手段として、請求項１の発明に係る弁装置は、
ボディと、ボトムと、このボディ及びボトム間に配置された弁機構部からなり、
前記ボディは、上側に開口した皿状支持部と、下側に開口した下部筒部と、前記皿状支持部及び下部筒部の開口方向と直交する方向へ開口した筒状の第一継手部及び第二継手部と、を備え、
前記ボトムは、前記ボディの下部筒部を塞ぐように固定され、
前記ボディの内部には、前記第一継手部の内周から前記ボディの内周へ延びる一次側通路と、前記第二継手部の内周に形成された二次側通路と、前記下部筒部の内周及び前記ボトムにより形成され、前記二次側通路と連続した弁室と、前記一次側通路及び前記二次側通路の境界に位置し、前記一次側通路と前記弁室を互いに連通する弁孔と、前記弁孔における前記二次側通路の端部に位置する環状の弁座と、前記皿状支持部の内周空間に形成される導圧室と、前記弁孔と同軸上に位置して、一端が前記一次側通路における前記弁孔と反対側に開口し他端が前記導圧室側に開口したシリンダ部と、前記二次側通路と前記導圧室を互いに連通する導圧路と、が形成され、
前記弁機構部は、前記シリンダ部及び前記弁孔を貫通して軸方向往復動可能に配置され、前記シリンダ部に挿通された部分にピストン部が形成され、このピストン部の外周面と前記シリンダ部との間の隙間はパッキンによって密封されている弁ロッドと、前記弁室に配置されるとともに前記弁ロッドの一端に取り付けられ前記弁座に接離可能に対向された弁体と、前記ボディの皿状支持部の内周に嵌入され、内周側に前記弁ロッドの前記ピストン部を挿入可能な内径孔と外周側に導圧孔及び導圧溝が形成されているプレートと、内径部は前記弁ロッドにおける前記弁体と反対側の端部に結合され外径部は前記皿状支持部の端面に密接状態で固定されている円盤状のダイアフラムと、前記弁ロッドを前記弁座に対する前記弁体の離間方向へ付勢するメインスプリングと、前記弁ロッドを前記弁座に対する前記弁体の接近方向へ付勢するリリーフスプリングと、を備え、
前記導圧室は、前記ボディにおける前記皿状支持部の内周空間にあって前記プレートと前記ダイアフラムとの間に画成され、前記プレートの前記導圧孔及び前記導圧溝と前記ボディの前記導圧路を介して前記二次側通路に連通されており、
前記ダイアフラムは、前記導圧路を介して前記導圧室に導入される前記二次側通路の圧力によって前記弁ロッドを前記弁座に対する前記弁体の接近方向へ変位させ、
前記弁体と前記弁座との互いのシール径が、前記シリンダ部と前記ピストン部との互いのシール径より大きいことを特徴とするものである。 As means for effectively solving the technical problem described above, the valve device according to the invention of claim 1 comprises:
Consists of a body, a bottom, and a valve mechanism disposed between the body and the bottom ,
The body has a dish-shaped support part opened upward, a lower cylinder part opened downward, and a cylindrical first joint part opened in a direction perpendicular to the opening direction of the dish-like support part and the lower cylinder part And a second joint part,
The bottom is fixed so as to close the lower cylindrical portion of the body,
Inside the body are a primary side passage extending from an inner circumference of the first joint portion to an inner circumference of the body, a secondary side passage formed on the inner circumference of the second joint portion, and the lower cylindrical portion. is formed by inner and the bottom of the valve chamber which is contiguous with the second-side passage located on the boundary of the primary passage and the secondary passage, communicate with each other the valve chamber and the primary side passage A valve hole, an annular valve seat located at an end of the secondary passage in the valve hole , a pressure guiding chamber formed in an inner circumferential space of the dish-like support part, and coaxial with the valve hole A cylinder portion having one end opened to the opposite side to the valve hole in the primary passage and the other end opened to the pressure guiding chamber, and a guide communicating the secondary side passage and the pressure guiding chamber with each other. A pressure path is formed,
The valve mechanism is disposed to be axially reciprocated through the cylinder portion and the valve hole, the piston portion is formed in the insertion portion to the cylinder portion, the outer peripheral surface and the cylinder of the piston portion and the valve rod clearance which is sealed by the packing between the parts, a valve body which is separable therefrom opposite to the valve seat attached to one end of the valve rod while being disposed in said valve chamber, said body An inner diameter hole into which the piston part of the valve rod can be inserted on the inner circumference side, a pressure introduction hole and a pressure introduction groove formed on the outer circumference side, and an inner diameter part Is a disc-shaped diaphragm which is coupled to the end of the valve rod opposite to the valve body and whose outer diameter is fixed in close contact with the end surface of the dish-shaped support, and the valve rod is connected to the valve seat Energizing the valve body in the separating direction That includes a main spring, and a relief spring for urging the valve rod to approaching direction of the valve body relative to the valve seat,
The pressure guiding chamber is in an inner circumferential space of the dish-like support portion in the body and is defined between the plate and the diaphragm, and the pressure guiding hole and the pressure guiding groove of the plate and the body Communicated with the secondary passage through the pressure guiding path,
The diaphragm displaces the valve rod in the approaching direction of the valve body with respect to the valve seat by the pressure of the secondary side passage introduced into the pressure guiding chamber via the pressure guiding path,
The seal diameter of the valve body and the valve seat is larger than the seal diameter of the cylinder part and the piston part .

上記構成において、二次側通路の圧力が上昇すると、この圧力は、ダイアフラムを弁座に対する弁体の接近方向へ変位させるので、弁座に対する弁体の開度が小さくなって、一次側から二次側へ通過する流体の圧力損失が大きくなり、逆に、二次側通路の圧力が低下すると、弁座に対する弁体の開度が大きくなって、一次側から二次側へ通過する流体の圧力損失が小さくなるので、二次側通路の圧力を一定範囲に保つように機能する。また、弁体に対する弁座のシール径が、シリンダ部と弁ロッドの互いのシール径より大きいため、弁体が弁孔を閉塞した状態のときに一次側通路の圧力が適正範囲を超えて上昇すると、弁体に作用する一次側通路の圧力による開弁力が閉弁力より大きくなって開弁し、一次側通路の圧力を二次側通路へ逃がすことができる。 In the above configuration, when the pressure in the secondary passage increases, the pressure displaces the diaphragm in the approaching direction of the valve body with respect to the valve seat. If the pressure loss of the fluid that passes to the secondary side increases and conversely the pressure in the secondary passage decreases, the opening of the valve element relative to the valve seat increases, and the fluid that passes from the primary side to the secondary side Since the pressure loss is reduced, it functions to keep the pressure in the secondary passage in a certain range. In addition, since the seal diameter of the valve seat with respect to the valve body is larger than the seal diameter of the cylinder part and the valve rod, the pressure in the primary side passage rises beyond the appropriate range when the valve body closes the valve hole. Then, the valve opening force due to the pressure of the primary side passage acting on the valve body becomes larger than the valve closing force and the valve is opened, and the pressure of the primary side passage can be released to the secondary side passage.

請求項２の発明に係る弁装置は、請求項１に記載の構成において、前記リリーフスプリングの荷重を調整する調整手段を有し、これによって、前記一次側通路の圧力を前記二次側通路へ逃すときの開弁圧を設定可能としたものである。 The valve device according to the invention of claim 2 is the structure of claim 1, comprising an adjusting means for adjusting a load of the relief spring, thereby, the pressure of the primary side passage to the secondary-side passage It is possible to set the valve opening pressure when releasing.

請求項３の発明に係る弁装置は、請求項１又は２に記載の構成において、前記プレートにおいて、前記内径孔の外周側にあって円弧状に延びる円周方向複数の被係合孔と、さらにその外側にあって円弧状に延びる円周方向複数の導圧孔が開設され、前記被係合孔の間及び前記導圧孔の間は径方向に延びる被係合リブとなっており、その下面には前記導圧孔間を連通する導圧溝が形成されているものである。 According to a third aspect of the present invention, there is provided the valve device according to the first or second aspect, wherein in the plate, a plurality of circumferentially engaged holes extending in an arc shape on the outer peripheral side of the inner diameter hole; Further, a plurality of circumferential pressure guide holes that are outside and extending in an arc shape are formed, and between the engaged holes and between the pressure guide holes are engaged ribs extending in the radial direction, A pressure guiding groove communicating with the pressure guiding holes is formed on the lower surface .

本発明に係る弁装置によれば、二次側通路の圧力を一定範囲に保つように動作する弁機構部が、一次側通路の圧力が適正範囲を超えて上昇したときにその圧力を二次側通路へ逃がす機能を兼備するため、従来のような第二弁機構部を設ける必要がなく、したがって簡素な構造とすることができる。 According to the valve device of the present invention, when the valve mechanism that operates so as to keep the pressure of the secondary side passage in a certain range, when the pressure of the primary side passage rises beyond the appropriate range, Since it also has a function of escaping to the side passage, it is not necessary to provide a second valve mechanism part as in the prior art, and therefore a simple structure can be achieved.

また、一次側通路の圧力が適正範囲を超えて上昇したときにその圧力をゴム状弾性材料からなる弁体の変形機能を利用して二次側通路へ逃がすようにすることによって、一層簡素な構造とすることができる。 Further, when the pressure of the primary side passage rises beyond the appropriate range, the pressure is released to the secondary side passage by utilizing the deformation function of the valve body made of rubber-like elastic material, thereby further simplifying. It can be a structure.

本発明に係る弁装置の第一の形態を、弁ロッドの軸心を通る平面で切断して示す開弁状態の断面図である。It is sectional drawing of the valve opening state which cut | disconnects and shows the 1st form of the valve apparatus which concerns on this invention by the plane which passes along the axial center of a valve rod. 本発明に係る弁装置の第一の形態を、弁ロッドの軸心を通る平面で切断して示す閉弁状態の断面図である。It is sectional drawing of the valve closing state which cut | disconnects and shows the 1st form of the valve apparatus which concerns on this invention by the plane which passes along the axial center of a valve rod. 本発明に係る弁装置の第一の形態の一部を示す分解斜視図である。It is a disassembled perspective view which shows a part of 1st form of the valve apparatus which concerns on this invention. 本発明に係る弁装置の第二の形態を、弁ロッドの軸心を通る平面で切断して示す閉弁状態の断面図である。It is sectional drawing of the valve closing state which cut | disconnects and shows the 2nd form of the valve apparatus which concerns on this invention in the plane which passes along the axial center of a valve rod. 本発明に係る弁装置の第三の形態を、弁ロッドの軸心を通る平面で切断して示す開弁による減圧作動状態の断面図である。It is sectional drawing of the pressure_reduction | reduced_pressure operation state by valve opening which shows the 3rd form of the valve apparatus which concerns on this invention cut | disconnected by the plane which passes along the axial center of a valve rod. 本発明に係る弁装置の第三の形態を、弁ロッドの軸心を通る平面で切断して示す閉弁状態の断面図である。It is sectional drawing of the valve closing state which cut | disconnects and shows the 3rd form of the valve apparatus which concerns on this invention by the plane which passes along the axial center of a valve rod. 本発明に係る弁装置の第三の形態を、弁ロッドの軸心を通る平面で切断して示す一次側通路の圧力逃がし時の状態の断面図である。It is sectional drawing of the state at the time of the pressure relief of the primary side channel | path which cut | disconnects and shows the 3rd form of the valve apparatus which concerns on this invention by the plane which passes along the axial center of a valve rod. 本発明に係る弁装置の第三の形態の変更例を、弁ロッドの軸心を通る平面で切断して示す断面図である。It is sectional drawing which cuts and shows the example of a change of the 3rd form of the valve apparatus which concerns on this invention by the plane which passes along the axial center of a valve rod. 本発明に係る弁装置の第四の形態を、弁ロッドの軸心を通る平面で切断して示す閉弁状態の断面図である。It is sectional drawing of the valve-closing state which cut | disconnects and shows the 4th form of the valve apparatus which concerns on this invention by the plane which passes along the axial center of a valve rod. 本発明に係る弁装置の第四の形態における弁体を保持するホルダの平面図である。It is a top view of the holder holding the valve body in the 4th form of the valve apparatus concerning the present invention. 本発明に係る弁装置の第四の形態において、一次側通路の圧力逃がし時の状態を、ロッドの軸心を通る平面で切断して示す開弁状態の部分断面図である。In the 4th form of the valve apparatus which concerns on this invention, it is a fragmentary sectional view of the valve opening state which cut | disconnects and shows the state at the time of the pressure release of a primary side channel | path by the plane which passes along the axial center of a rod. 図１１におけるXII−XIIで切断して示す部分断面図である。It is a fragmentary sectional view cut | disconnected and shown by XII-XII in FIG. 本発明に係る弁装置の第五の形態を、弁ロッドの軸心を通る平面で切断して示す閉弁状態の断面図である。It is sectional drawing of the valve-closing state which cut | disconnects and shows the 5th form of the valve apparatus which concerns on this invention by the plane which passes along the axial center of a valve rod. 本発明に係る弁装置の第五の形態における弁体の平面図及び側面図である。It is the top view and side view of a valve body in the 5th form of the valve apparatus which concerns on this invention. 本発明に係る弁装置の第五の形態において、一次側通路の圧力逃がし時の状態を、図１３におけるXV−XVで切断して示す部分断面図である。FIG. 14 is a partial cross-sectional view showing a state when the pressure in the primary passage is released in a fifth embodiment of the valve device according to the present invention, cut along XV-XV in FIG. 13. 従来の弁装置を弁ロッドの軸心を通る平面で切断して示す断面図である。It is sectional drawing which cut | disconnects and shows the conventional valve apparatus by the plane which passes along the axial center of a valve rod.

以下、本発明に係る弁装置について、図面を参照しながら詳細に説明する。まず図１は、本発明に係る弁装置の第一の形態を、弁ロッドの軸心を通る平面で切断して示す開弁状態の断面図、図２は、同じく閉弁状態の断面図、図３は、部分的な分解斜視図である。 Hereinafter, the valve device according to the present invention will be described in detail with reference to the drawings. First, FIG. 1 is a sectional view showing a first embodiment of a valve device according to the present invention by cutting along a plane passing through the axis of a valve rod, and FIG. 2 is a sectional view showing the same valve closing state. FIG. 3 is a partial exploded perspective view.

図１及び図２において、参照符号１は合成樹脂製のボディで、上側に開口した皿状支持部１１と、下側に開口した下部筒部１２と、皿状支持部１１及び下部筒部１２の開口方向と直交する方向へ開口した筒状の第一継手部１３、及び第二継手部１４を備える。また、参照符号２は合成樹脂製のボトムで、ボディ１の下部筒部１２を塞ぐように固定され、その嵌合面間はＯリング２１によって密封されている。 In FIGS. 1 and 2, reference numeral 1 is a synthetic resin body, a dish-like support part 11 opened upward, a lower cylinder part 12 opened downward, a dish-like support part 11 and a lower cylinder part 12. A cylindrical first joint portion 13 and a second joint portion 14 that are open in a direction orthogonal to the opening direction of the first joint portion 14 are provided. Reference numeral 2 is a bottom made of synthetic resin, which is fixed so as to close the lower cylindrical portion 12 of the body 1, and a space between the fitting surfaces is sealed by an O-ring 21.

ボディ１の内部には、第一継手部１３の内周からボディ１の内部へ延びる一次側通路Ａと、第二継手部１４の内周に形成された二次側通路Ｂと、下部筒部１２の内周及びボトム２により形成され二次側通路Ｂと連続した弁室Ｃと、一次側通路Ａと弁室Ｃを互いに連通する弁孔Ｄと、この弁孔Ｄと同軸上に位置して一端が一次側通路Ａにおける弁孔Ｄと反対側に開口し他端が皿状支持部１１の内周空間に形成される導圧室Ｇ側に開口したシリンダ部Ｅと、二次側通路Ｂと前記導圧室Ｇを互いに連通する導圧路Ｆが形成されている。 In the body 1, a primary side passage A extending from the inner periphery of the first joint portion 13 to the inside of the body 1, a secondary side passage B formed on the inner periphery of the second joint portion 14, and a lower cylinder portion 12, a valve chamber C formed by the inner circumference and the bottom 2 and continuous with the secondary side passage B, a valve hole D communicating the primary side passage A and the valve chamber C with each other, and coaxially positioned with the valve hole D. A cylinder portion E having one end opened to the side opposite to the valve hole D in the primary passage A and the other end opened to the pressure guiding chamber G formed in the inner circumferential space of the dish-like support portion 11; A pressure guiding path F that communicates B and the pressure guiding chamber G with each other is formed.

参照符号３は弁機構部で、ボディ１のシリンダ部Ｅ及び弁孔Ｄを貫通して軸方向往復動可能に配置された弁ロッド３１と、ボディ１の弁室Ｃに配置されると共に前記弁ロッド３１の一端に結合された弁体３２と、前記弁ロッド３１の他端に結合され導圧路Ｆを介して導圧室Ｇに導入される二次側通路Ｂの水圧により弁ロッド３１を弁孔Ｄに対する弁体３２の接近方向へ変位させるダイアフラム３３と、弁ロッド３１を弁孔Ｄに対する弁体３２の離間方向へ付勢するメインスプリング３４と、弁ロッド３１を弁孔Ｄに対する弁体３２の接近方向へ付勢するリリーフスプリング３８と、を備える。 Reference numeral 3 denotes a valve mechanism portion, which is disposed in the valve chamber 31 of the body 1 through the cylinder portion E and the valve hole D of the body 1 so as to be capable of reciprocating in the axial direction, and the valve. The valve body 31 is connected to one end of the rod 31 and the valve rod 31 is connected to the other end of the valve rod 31 by the water pressure in the secondary side passage B introduced into the pressure guiding chamber G via the pressure guiding path F. A diaphragm 33 for displacing the valve body 32 toward the valve hole D in the approach direction, a main spring 34 for urging the valve rod 31 in a direction away from the valve body 32 with respect to the valve hole D, and a valve body for the valve rod 31 with respect to the valve hole D And a relief spring 38 that urges in the approaching direction.

詳しくは、弁機構部３における弁ロッド３１はシリンダ部Ｅに挿通された部分にピストン部３１ａが形成されており、このピストン部３１ａの外周面とシリンダ部Ｅとの間の隙間はパッキン３５によって密封されている。 Specifically, the valve rod 31 in the valve mechanism portion 3 is formed with a piston portion 31 a in a portion inserted through the cylinder portion E, and a gap between the outer peripheral surface of the piston portion 31 a and the cylinder portion E is defined by a packing 35. Sealed.

弁機構部３における弁体３２は、弁孔Ｄの二次側通路Ｂ側（弁室Ｃ側）に配置され、外径が弁孔Ｄよりも大径の環状をなすものであってゴム状弾性材料（ゴム材料又はゴム状弾性を有する合成樹脂材料）からなり、金属製のホルダ３２１に嵌合保持されると共に、弁ロッド３１の一端に形成された雄螺子３１ｂに螺合したナット３６と、前記弁ロッド３１の一端近傍に弁孔Ｄよりも小径に形成されたフランジ３１ｄの間に挟持された状態で結合され、弁孔Ｄにおける二次側通路Ｂ側の端部に突出形成された環状の弁座１５と対向している。 The valve body 32 in the valve mechanism section 3 is disposed on the secondary side passage B side (valve chamber C side) of the valve hole D, forms an annular shape whose outer diameter is larger than that of the valve hole D, and is rubbery. A nut 36 made of an elastic material (rubber material or synthetic resin material having rubber-like elasticity) is fitted and held in a metal holder 321 and screwed into a male screw 31b formed at one end of the valve rod 31; The valve rod 31 is coupled in the vicinity of one end of a flange 31d having a diameter smaller than that of the valve hole D, and is protruded from the end of the valve hole D on the secondary passage B side. It faces the annular valve seat 15.

弁機構部３におけるダイアフラム３３は、円盤状のゴム状弾性材料（ゴム材料又はゴム状弾性を有する合成樹脂材料）からなるものであって、弁ロッド３１のピストン部３１ａよりも十分に大径であり、その内径部は、弁ロッド３１の他端（弁体３２と反対側の端部）に形成された雄螺子３１ｃ及びこれに螺合したナット３７によって、ボディ１の皿状支持部１１の内径よりも小径の円盤状の合成樹脂板又は金属板からなるリテーナ３３ａを介して、このリテーナ３３ａと弁ロッド３１のピストン部３１ａとの間に挟持された状態で結合されている。 The diaphragm 33 in the valve mechanism section 3 is made of a disk-like rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity), and has a sufficiently larger diameter than the piston portion 31a of the valve rod 31. The inner diameter portion of the dish-like support portion 11 of the body 1 is defined by a male screw 31c formed at the other end (the end opposite to the valve body 32) of the valve rod 31 and a nut 37 screwed into the male screw 31c. The retainer 33 a is made of a disc-shaped synthetic resin plate or metal plate having a smaller diameter than the inner diameter, and is coupled between the retainer 33 a and the piston portion 31 a of the valve rod 31.

参照符号４は金属等からなるカバーであって、そのフランジ部４ａが複数の螺子部材４１によってボディ１の皿状支持部１１の端面に取り付けられている。そしてダイアフラム３３の外径部は、前記フランジ部４ａと皿状支持部１１の間に挟持されることによって、この皿状支持部１１の端面に密接状態で固定されている。 Reference numeral 4 is a cover made of metal or the like, and its flange portion 4 a is attached to the end surface of the dish-like support portion 11 of the body 1 by a plurality of screw members 41. The outer diameter portion of the diaphragm 33 is fixed in close contact with the end surface of the dish-like support portion 11 by being sandwiched between the flange portion 4 a and the dish-like support portion 11.

そしてダイアフラム３３は、ボディ１の皿状支持部１１の外径フランジ部とカバー４のフランジ部４ａで挟持された外径部と、リテーナ３３ａと弁ロッド３１のピストン部３１ａで挟持された内径部との間に、容易に変形可能な可撓部が形成されているため、導圧路Ｆを通じて導圧室Ｇに導入される二次側通路Ｂの水圧の変化によって軸方向（厚さ方向）へ変位することができる。 The diaphragm 33 includes an outer diameter portion sandwiched between the outer diameter flange portion of the dish-shaped support portion 11 of the body 1 and the flange portion 4 a of the cover 4, and an inner diameter portion sandwiched between the retainer 33 a and the piston portion 31 a of the valve rod 31. Since a flexible part that can be easily deformed is formed between and the axial direction (thickness direction) due to a change in water pressure in the secondary passage B introduced into the pressure guiding chamber G through the pressure guiding path F. Can be displaced.

弁機構部３におけるメインスプリング３４は金属製のコイルスプリングからなるものであって、カバー４の上部筒部４ｂの内周に螺合された調節螺子４２と、ダイアフラム３３の内径部を押さえているリテーナ３３ａとの間に適当な圧縮状態で配置されており、その圧縮反力によって、弁座１５から弁体３２が離間する方向（開弁方向）へ弁ロッド３１を付勢するものである。なお、調節螺子４２はカバー４の上部筒部４ｂへのねじ込み量によってメインスプリング３４の初期圧縮量、言い換えれば弁ロッド３１への付勢力を調節するものであって、その中央部にはダイアフラム３３の円滑な動作を確保するための通気孔４２ａが開設されている。 The main spring 34 in the valve mechanism portion 3 is made of a metal coil spring, and holds down the adjusting screw 42 screwed into the inner periphery of the upper cylindrical portion 4 b of the cover 4 and the inner diameter portion of the diaphragm 33. It arrange | positions in the appropriate compression state between the retainers 33a, and the valve rod 31 is urged | biased in the direction (valve opening direction) which the valve body 32 separates from the valve seat 15 with the compression reaction force. The adjusting screw 42 adjusts the initial compression amount of the main spring 34, in other words, the urging force to the valve rod 31, depending on the screwing amount of the cover 4 into the upper cylindrical portion 4b. A vent hole 42a is established to ensure smooth operation.

参照符号５は合成樹脂等からなる円盤状のプレートで、ボディ１の皿状支持部１１の内周に嵌入されている。このプレート５は、図３に示されるように、弁ロッド３１のピストン部３１ａを挿入可能な内径孔５ａと、その外周側にあって円弧状に延びる円周方向複数の被係合孔５ｂと、さらにその外周側にあって円弧状に延びる円周方向複数の導圧孔５ｃが開設され、各被係合孔５ｂの間及び各導圧孔５ｃの間は径方向に延びる被係合リブ５１となっており、その下面には各導圧孔５ｃ間を互いに連通する導圧溝５ｄが形成されている。また、このプレート５の内径部には、内径孔５ａを介して対向し、互いに平行な一対の平面からなる係合面５ｅが形成されている。 Reference numeral 5 is a disk-shaped plate made of synthetic resin or the like, and is fitted into the inner periphery of the dish-shaped support portion 11 of the body 1. As shown in FIG. 3, the plate 5 has an inner diameter hole 5 a into which the piston portion 31 a of the valve rod 31 can be inserted, and a plurality of engaged holes 5 b on the outer peripheral side extending in an arc shape in the circumferential direction. Further, a plurality of circumferential pressure guide holes 5c extending in an arc shape on the outer peripheral side are formed, and the engaged ribs extending in the radial direction between the engaged holes 5b and between the respective pressure introducing holes 5c. 51, and pressure guide grooves 5d are formed on the lower surface of the pressure guide holes 5c so as to communicate with each other. Further, an engagement surface 5e formed of a pair of planes facing each other through the inner diameter hole 5a and parallel to each other is formed on the inner diameter portion of the plate 5.

導圧室Ｇは、ボディ１における皿状支持部１１の内周空間にあってプレート５とダイアフラム３３の間に画成されている。この導圧室Ｇは、プレート５に形成された複数の導圧孔５ｃ及び導圧溝５ｄとボディ１の導圧路Ｆを介して、ボディ１の二次側通路Ｂに連通されている。 The pressure guiding chamber G is in the inner circumferential space of the dish-like support portion 11 in the body 1 and is defined between the plate 5 and the diaphragm 33. The pressure guiding chamber G communicates with the secondary side passage B of the body 1 through a plurality of pressure guiding holes 5 c and pressure guiding grooves 5 d formed in the plate 5 and a pressure guiding path F of the body 1.

プレート５の外径部の上面は突縁５２となっていて、図１及び図２に示される組み立て状態では、この突縁５２はダイアフラム３３の外径部を介してカバー４のフランジ部４ａと対向しており、これによってボディ１の皿状支持部１１の内周に抜け止め状態で保持されている。 The upper surface of the outer diameter portion of the plate 5 is a protruding edge 52, and in the assembled state shown in FIGS. 1 and 2, the protruding edge 52 is connected to the flange portion 4 a of the cover 4 via the outer diameter portion of the diaphragm 33. It is opposed to the inner periphery of the dish-like support portion 11 of the body 1 and is held in a retaining state.

弁ロッド３１のピストン部３１ａの外周面とボディ１のシリンダ部Ｅとの間の隙間を密封するパッキン３５は、前記シリンダ部Ｅにおける皿状支持部１１側の端部に形成された環状溝と、前記皿状支持部１１の内周に嵌入されたプレート５の内径部との間に保持されている。 A packing 35 that seals a gap between the outer peripheral surface of the piston portion 31a of the valve rod 31 and the cylinder portion E of the body 1 includes an annular groove formed at an end portion of the cylinder portion E on the side of the dish-like support portion 11. The plate-like support portion 11 is held between the inner diameter portion of the plate 5 fitted on the inner periphery thereof.

図２に示されるように弁体３２と弁座１５が互いに密接したときのシール径φ２は、弁ロッド３１のピストン部３１ａの外径、すなわちパッキン３５によるシール径φ１よりも僅かに大きく、言い換えれば、弁孔Ｄの閉塞時にこの弁孔Ｄを介して一次側通路Ａの水圧を受ける弁体３２の受圧面積は、一次側通路Ａの水圧に対するピストン部３１ａの受圧面積よりも僅かに大きい。なお、前記弁体３２の受圧面積は、導圧室Ｇの水圧に対するダイアフラム３３の受圧面積よりも小さい。 As shown in FIG. 2, the seal diameter φ2 when the valve body 32 and the valve seat 15 are in close contact with each other is slightly larger than the outer diameter of the piston portion 31a of the valve rod 31, that is, the seal diameter φ1 by the packing 35, in other words. For example, when the valve hole D is closed, the pressure receiving area of the valve body 32 that receives the water pressure of the primary side passage A through the valve hole D is slightly larger than the pressure receiving area of the piston portion 31a with respect to the water pressure of the primary side passage A. The pressure receiving area of the valve body 32 is smaller than the pressure receiving area of the diaphragm 33 with respect to the water pressure of the pressure guiding chamber G.

弁機構部３におけるリリーフスプリング３８は金属製のコイルスプリングからなるものであって、弁室Ｃに配置され、ボディ１の下部筒部１２を塞ぐボトム２と弁体３２のホルダ３２１の間に適宜圧縮状態で介在されることによって、弁ロッド３１を弁体３２の閉弁方向へ付勢するものである。リリーフスプリング３８の一端は、弁体３２を弁ロッド３１に結合しているナット３６の外周に遊嵌状態に保持され、リリーフスプリング３８の他端は、ボトム２の内面に形成された支持突起２ａの外周に遊嵌状態に保持されている。 The relief spring 38 in the valve mechanism section 3 is made of a metal coil spring, and is disposed in the valve chamber C and is appropriately disposed between the bottom 2 that closes the lower cylinder section 12 of the body 1 and the holder 321 of the valve body 32. By being interposed in the compressed state, the valve rod 31 is urged in the valve closing direction of the valve body 32. One end of the relief spring 38 is held loosely on the outer periphery of a nut 36 that couples the valve body 32 to the valve rod 31, and the other end of the relief spring 38 is a support protrusion 2 a formed on the inner surface of the bottom 2. It is held in a loosely fitted state on the outer periphery of.

また、リリーフスプリング３８の荷重は、シール径φ１，φ２の差によるピストン部３１ａの受圧面積と弁体３２の受圧面積の差と、一次側通路Ａにおける適正範囲の水圧の上限値との積に相当する。 The load of the relief spring 38 is the product of the difference between the pressure receiving area of the piston portion 31a and the pressure receiving area of the valve body 32 due to the difference between the seal diameters φ1 and φ2 and the upper limit value of the water pressure in the appropriate range in the primary passage A. Equivalent to.

一方、ボディ１における皿状支持部１１の底面１１ａには、その内径近傍に位置して円周方向複数の係合突起１１ｂが形成されており、これらの係合突起１１ｂは、それぞれプレート５における被係合孔５ｂと円周方向に係合可能となっている。係合突起１１ｂの突出高さはプレート５の突縁５２とほぼ同一高さであって、ダイアフラム３３の内径部を押さえているリテーナ３３ａと軸方向に対向する位置にある。このため、メインスプリング３４の伸長方向（弁座１５から弁体３２が離間する方向；開弁方向）への弁ロッド３１の動作は、ダイアフラム３３の内径部が係合突起１１ｂと当接することによって制限されるようになっている。 On the other hand, a plurality of engaging projections 11b in the circumferential direction are formed on the bottom surface 11a of the dish-like support portion 11 in the body 1 so as to be located in the vicinity of the inner diameter thereof. It is possible to engage with the engaged hole 5b in the circumferential direction. The protrusion height of the engaging protrusion 11 b is substantially the same as the protrusion edge 52 of the plate 5, and is in a position facing the retainer 33 a holding the inner diameter portion of the diaphragm 33 in the axial direction. Therefore, the operation of the valve rod 31 in the extending direction of the main spring 34 (the direction in which the valve body 32 is separated from the valve seat 15; the valve opening direction) is caused by the inner diameter portion of the diaphragm 33 coming into contact with the engaging protrusion 11b. It has come to be restricted.

以上のように構成された第一の形態の弁装置は、ボディ１の第一継手部１３が上流側の配管に接続され、ボディ１の第二継手部１４が下流側の配管に接続されることによって、上流側の配管から一次側通路Ａ、弁孔Ｄ、弁室Ｃを経由して二次側通路Ｂからさらに下流側の配管へ到る流路を形成する。 In the valve device according to the first embodiment configured as described above, the first joint portion 13 of the body 1 is connected to the upstream pipe, and the second joint portion 14 of the body 1 is connected to the downstream pipe. Thus, a flow path is formed from the upstream side pipe through the primary side passage A, the valve hole D, and the valve chamber C to the further downstream side pipe B.

そして、例えば二次側通路Ｂの下流側の流路を開放することによって、二次側通路Ｂの水圧が一次側通路Ａの水圧よりも低下した場合は、これに伴って、ダイアフラム３３をメインスプリング３４の圧縮方向へ変位させる導圧室Ｇの水圧が低下するため、弁ロッド３１はメインスプリング３４の伸長力によって、弁体３２がリリーフスプリング３８を圧縮しながら弁座１５から離れる方向へ変位し、すなわち弁機構部３が図１に示されるように開弁動作する。このため、不図示の給水源から供給される水が、一次側通路Ａから弁孔Ｄ、弁座１５と弁体３２との隙間、弁室Ｃ及び二次側通路Ｂを経由してその下流側へ吐出される。 For example, when the water pressure in the secondary side passage B is lower than the water pressure in the primary side passage A by opening the flow path downstream of the secondary side passage B, the diaphragm 33 is moved to the main Since the hydraulic pressure of the pressure guiding chamber G that is displaced in the compression direction of the spring 34 is reduced, the valve rod 31 is displaced in a direction away from the valve seat 15 while the valve body 32 compresses the relief spring 38 by the extension force of the main spring 34. That is, the valve mechanism section 3 opens as shown in FIG. For this reason, the water supplied from a water supply source (not shown) flows downstream from the primary passage A via the valve hole D, the gap between the valve seat 15 and the valve body 32, the valve chamber C and the secondary passage B. Discharged to the side.

また、図１に示される開弁状態において、二次側通路Ｂの水圧が上昇した場合は、二次側通路Ｂと連通した導圧室Ｇの水圧も上昇するので、ダイアフラム３３はメインスプリング３４を圧縮させる方向、すなわち弁ロッド３１を介して弁体３２を弁座１５に接近させる方向へ変位する。このため、弁孔Ｄに対する弁体３２の開度が小さくなって、弁座１５と弁体３２との隙間を水が通過する際の圧力損失が大きくなるので、二次側通路Ｂの水圧が低下する。したがって、二次側通路Ｂの水圧の変動を抑制して一定範囲に保持することができる。 Further, in the valve open state shown in FIG. 1, when the water pressure in the secondary side passage B rises, the water pressure in the pressure guiding chamber G communicating with the secondary side passage B also rises, so that the diaphragm 33 has the main spring 34. The valve body 32 is displaced in the direction in which the valve body 32 is made to approach the valve seat 15 via the valve rod 31. For this reason, since the opening degree of the valve body 32 with respect to the valve hole D becomes small and the pressure loss at the time of water passing through the clearance gap between the valve seat 15 and the valve body 32 becomes large, the water pressure of the secondary side channel | path B is increased. descend. Therefore, the fluctuation | variation of the water pressure of the secondary side channel | path B can be suppressed and it can hold | maintain in a fixed range.

次に、例えば二次側通路Ｂの下流側の流路が閉鎖されることによって、一次側通路Ａから弁孔Ｄ、弁座１５と弁体３２との隙間、弁室Ｃ及び二次側通路Ｂを経由してその下流側へ吐出される水の流れが止まると、二次側通路Ｂの水圧が一次側通路Ａの水圧と同等になるので、二次側通路Ｂから導入されている導圧室Ｇの水圧によって、ダイアフラム３３はメインスプリング３４を圧縮させる方向へ変位する。このため図２に示されるように、弁ロッド３１は弁体３２が弁座１５と密接する位置まで変位し、すなわち弁機構部３は弁孔Ｄを閉塞（閉弁）する。 Next, for example, the flow path on the downstream side of the secondary side passage B is closed, so that the valve hole D, the clearance between the valve seat 15 and the valve body 32, the valve chamber C, and the secondary side passage are formed from the primary side passage A. When the flow of water discharged to the downstream side via B stops, the water pressure in the secondary side passage B becomes equal to the water pressure in the primary side passage A. Due to the water pressure in the pressure chamber G, the diaphragm 33 is displaced in a direction in which the main spring 34 is compressed. Therefore, as shown in FIG. 2, the valve rod 31 is displaced to a position where the valve body 32 comes into close contact with the valve seat 15, that is, the valve mechanism 3 closes (closes) the valve hole D.

また、図２に示される閉弁状態において、配管の凍結など、何らかの原因により一次側通路Ａの水圧が適正範囲を超えて上昇した場合、弁孔Ｄを介して一次側通路Ａの水圧を受ける弁体３２の受圧面積は、一次側通路Ａの水圧に対する弁ロッド３１のピストン部３１ａの受圧面積よりも僅かに大きいため、その受圧面積の差による弁ロッド３１への付勢力は開弁方向へ作用する。したがって、このような受圧面積の差と一次側通路Ａの水圧との積と、メインスプリング３４の荷重の和が、ダイアフラム３３に作用する導圧室Ｇの水圧による閉弁力とリリーフスプリング３８の荷重との和より大きくなると、弁機構部３が開弁動作して弁体３２が弁孔Ｄを開放するため、一次側通路Ａの水圧は二次側通路Ｂへ逃がされ、一次側通路Ａの異常な水圧上昇が防止される。 In the closed state shown in FIG. 2, when the water pressure in the primary side passage A rises beyond an appropriate range for some reason such as freezing of the pipe, the water pressure in the primary side passage A is received through the valve hole D. Since the pressure receiving area of the valve body 32 is slightly larger than the pressure receiving area of the piston portion 31a of the valve rod 31 with respect to the water pressure in the primary side passage A, the urging force to the valve rod 31 due to the difference in the pressure receiving area is in the valve opening direction. Works. Therefore, the sum of the product of the pressure receiving area difference and the water pressure in the primary passage A and the load of the main spring 34 is the valve closing force due to the water pressure in the pressure guiding chamber G acting on the diaphragm 33 and the relief spring 38. When larger than the sum of the load, the valve mechanism 3 is opened and the valve element 32 opens the valve hole D, so that the water pressure in the primary side passage A is released to the secondary side passage B, and the primary side passage An abnormal water pressure rise of A is prevented.

そして、この実施の形態によれば、二次側通路Ｂの水圧を一定範囲に保つように動作する弁機構部３が、上述のように、一次側通路Ａの水圧が適正範囲を超えて上昇したときにその水圧を二次側通路Ｂへ逃がす機能を兼備するため、図１６に示される従来技術のような第二弁機構部１２０を設ける必要がなく、したがって簡素な構造とすることができる。 And according to this embodiment, the valve mechanism part 3 which operates so as to keep the water pressure in the secondary passage B within a certain range increases the water pressure in the primary passage A beyond the appropriate range as described above. Therefore, it is not necessary to provide the second valve mechanism 120 as in the prior art shown in FIG. 16 because the water pressure is released to the secondary side passage B, and thus a simple structure can be obtained. .

また、上記構成において、受圧面積の差による開弁力がどの程度増大したときに弁体３２が弁孔Ｄを開放して一次側通路Ａの水圧を二次側通路Ｂへ逃がすかを、リリーフスプリング３８の付勢力によって適切に設定することができる。 Further, in the above configuration, how much the valve opening force due to the difference in pressure receiving area increases when the valve element 32 opens the valve hole D to release the water pressure in the primary side passage A to the secondary side passage B is relief. It can be appropriately set by the biasing force of the spring 38.

次に図４は、本発明に係る弁装置の第二の形態として、リリーフスプリング３８の付勢力を調整可能としたものを、弁ロッドの軸心を通る平面で切断して示す閉弁状態の断面図である。 Next, FIG. 4 shows a second embodiment of the valve device according to the present invention, in which the urging force of the relief spring 38 can be adjusted, in a closed state shown by cutting along a plane passing through the axis of the valve rod. It is sectional drawing.

すなわち、この第二の形態において、上述した第一の形態と異なるところは、ボトム２に筒状部２２が弁ロッド３１と同心的に形成され、この筒状部２２の内周に、支持突起２３ａを有する調整螺子２３が螺合され、リリーフスプリング３８の一端が、弁体３２を弁ロッド３１に結合しているナット３６の外周に遊嵌状態に保持され、リリーフスプリング３８の他端が、前記調整螺子２３の支持突起２３ａの外周に遊嵌状態に保持された点にある。筒状部２２とこれにねじ込まれた調整螺子２３との間の隙間は、パッキン２４によって密封されている。その他の部分は、第一の形態と同様に構成することができる。なお、調整螺子２３は請求項２に記載された調整手段に相当するものである。 That is, the second embodiment differs from the first embodiment described above in that the cylindrical portion 22 is formed concentrically with the valve rod 31 on the bottom 2, and a support protrusion is formed on the inner periphery of the cylindrical portion 22. The adjustment screw 23 having 23a is screwed, one end of the relief spring 38 is held loosely on the outer periphery of the nut 36 connecting the valve body 32 to the valve rod 31, and the other end of the relief spring 38 is The adjustment screw 23 is held in a loosely fitted state on the outer periphery of the support protrusion 23a. A gap between the cylindrical portion 22 and the adjusting screw 23 screwed into the cylindrical portion 22 is sealed with a packing 24. Other parts can be configured in the same manner as in the first embodiment. The adjusting screw 23 corresponds to the adjusting means described in claim 2.

第二の形態によれば、ボトム２の筒状部２２に対する調整螺子２３のねじ込み量によって、リリーフスプリング３８の初期圧縮量が変化するので、弁体３２が弁孔Ｄを開放するときの開弁圧や、一次側通路Ａと二次側通路Ｂの圧力差による弁体３２の開度を任意に微調整することができる。 According to the second embodiment, the initial compression amount of the relief spring 38 varies depending on the screwing amount of the adjusting screw 23 with respect to the cylindrical portion 22 of the bottom 2, so that the valve element 32 opens when the valve hole 32 opens the valve hole D. The degree of opening of the valve body 32 due to the pressure and the pressure difference between the primary side passage A and the secondary side passage B can be finely adjusted arbitrarily.

次に図５〜図７は、本発明に係る弁装置の第三の形態を、弁ロッドの軸心を通る平面で切断して示す断面図で、このうち図５は開弁による減圧作動状態、図６は閉弁状態、図７は一次圧力逃がし時の状態を示すものである。 Next, FIGS. 5 to 7 are sectional views showing a third embodiment of the valve device according to the present invention by cutting along a plane passing through the axis of the valve rod, in which FIG. 6 shows the valve closed state, and FIG. 7 shows the state when the primary pressure is released.

この第三の形態において、上述した第一の形態と異なるところは、弁体３２が、弁ロッド３１のダイアフラム３３と反対側の端部に形成された挿入軸部３１ｅに軸方向相対変位可能な状態で外挿され、コイルスプリングからなるリリーフスプリング３８が、前記挿入軸部３１ｅの端部にボルト３１ｆによって固定されたスプリング受け３１ｇと、弁体３２を密嵌してなる金属製のホルダ３２１との間に適宜圧縮状態で介在されたことにある。その他の部分は、第一の形態と同様に構成することができる。 In the third embodiment, the difference from the first embodiment described above is that the valve body 32 can be axially displaced relative to the insertion shaft portion 31e formed at the end of the valve rod 31 opposite to the diaphragm 33. A relief spring 38 which is extrapolated in a state and is made up of a coil spring, a spring receiver 31g fixed to the end of the insertion shaft portion 31e by a bolt 31f, and a metal holder 321 formed by closely fitting the valve body 32; Between the two, in an appropriately compressed state. Other parts can be configured in the same manner as in the first embodiment.

このため、弁体３２は、リリーフスプリング３８によって弁座１５に対する接近方向へ付勢され、通常、弁ロッド３１のフランジ部３１ｄに押し付けられている。また、弁体３２の内周面は、弁ロッド３１の挿入軸部３１ｅの外周面と摺動可能に密接されている。 For this reason, the valve body 32 is biased in the approaching direction with respect to the valve seat 15 by the relief spring 38 and is normally pressed against the flange portion 31 d of the valve rod 31. The inner peripheral surface of the valve body 32 is in close contact with the outer peripheral surface of the insertion shaft portion 31e of the valve rod 31 so as to be slidable.

なお、この第三の形態では、必ずしも弁体３２と弁座１５の互いのシール径φ２を、弁ロッド３１のピストン部３１ａの外径、すなわちパッキン３５によるシール径φ１より大きくしなくても良い。 In the third embodiment, the seal diameter φ2 of the valve body 32 and the valve seat 15 does not necessarily have to be larger than the outer diameter of the piston portion 31a of the valve rod 31, that is, the seal diameter φ1 by the packing 35. .

以上の構成において、例えば二次側通路Ｂの下流側の流路を開放することによって、二次側通路Ｂの水圧が一次側通路Ａの水圧よりも低下した場合は、二次側通路Ｂの水圧低下に伴って、ダイアフラム３３をメインスプリング３４の圧縮方向へ変位させる導圧室Ｇの水圧が低下するため、弁ロッド３１はメインスプリング３４の伸長力によって、弁体３２がリリーフスプリング３８を圧縮しながら弁座１５から離れる方向へ変位し、すなわち弁機構部３が図５に示されるように開弁動作する。このため、不図示の給水源から供給される水が、一次側通路Ａから弁孔Ｄ、弁座１５と弁体３２との隙間、弁室Ｃ及び二次側通路Ｂを経由してその下流側へ吐出される。 In the above configuration, for example, when the water pressure in the secondary side passage B is lower than the water pressure in the primary side passage A by opening the flow path downstream of the secondary side passage B, the secondary side passage B As the water pressure decreases, the water pressure in the pressure guiding chamber G that displaces the diaphragm 33 in the compression direction of the main spring 34 decreases. Therefore, the valve rod 31 compresses the relief spring 38 by the extension force of the main spring 34. However, the valve mechanism 15 is displaced in a direction away from the valve seat 15, that is, the valve mechanism 3 is opened as shown in FIG. For this reason, the water supplied from a water supply source (not shown) flows downstream from the primary passage A via the valve hole D, the gap between the valve seat 15 and the valve body 32, the valve chamber C and the secondary passage B. Discharged to the side.

また、図５に示される開弁状態において、二次側通路Ｂの水圧が上昇した場合は、導圧路Ｆを介して二次側通路Ｂと連通した導圧室Ｇの水圧も上昇するので、ダイアフラム３３はメインスプリング３４を圧縮させる方向、すなわち弁ロッド３１を介して弁体３２を弁座１５に接近させる方向へ変位する。このため、弁孔Ｄに対する弁体３２の開度が小さくなって、弁座１５と弁体３２との隙間を水が通過する際の圧力損失が大きくなるので、二次側通路Ｂの水圧が低下する。したがって、二次側通路Ｂの水圧の変動を抑制して一定範囲に保持することができる。 Further, in the valve open state shown in FIG. 5, when the water pressure in the secondary side passage B increases, the water pressure in the pressure guiding chamber G communicating with the secondary side passage B via the pressure guiding passage F also increases. The diaphragm 33 is displaced in a direction in which the main spring 34 is compressed, that is, in a direction in which the valve body 32 approaches the valve seat 15 via the valve rod 31. For this reason, since the opening degree of the valve body 32 with respect to the valve hole D becomes small and the pressure loss at the time of water passing through the clearance gap between the valve seat 15 and the valve body 32 becomes large, the water pressure of the secondary side channel | path B is increased. descend. Therefore, the fluctuation | variation of the water pressure of the secondary side channel | path B can be suppressed and it can hold | maintain in a fixed range.

また、例えば二次側通路Ｂの下流側の流路が閉鎖されることによって、一次側通路Ａから弁孔Ｄ、弁座１５と弁体３２との隙間、弁室Ｃ及び二次側通路Ｂを経由してその下流側へ吐出される水の流れが止まった場合は、二次側通路Ｂの水圧が一次側通路Ａの水圧と同等になるので、二次側通路Ｂから導入される導圧室Ｇの水圧によって、ダイアフラム３３はメインスプリング３４を圧縮させる方向へ変位する。このため図６に示されるように、弁ロッド３１は弁体３２が弁座１５と密接する位置まで変位し、すなわち弁機構部３は弁孔Ｄを閉塞（閉弁）する。 Further, for example, by closing the downstream flow path of the secondary side passage B, the valve passage D, the clearance between the valve seat 15 and the valve body 32, the valve chamber C, and the secondary side passage B are closed from the primary side passage A. When the flow of water discharged to the downstream side through the water stops, the water pressure in the secondary side passage B becomes equal to the water pressure in the primary side passage A. Due to the water pressure in the pressure chamber G, the diaphragm 33 is displaced in a direction in which the main spring 34 is compressed. Therefore, as shown in FIG. 6, the valve rod 31 is displaced to a position where the valve body 32 comes into close contact with the valve seat 15, that is, the valve mechanism 3 closes (closes) the valve hole D.

また、図６に示される閉弁状態において、配管の凍結など、何らかの原因により一次側通路Ａの水圧が適正範囲を超えて上昇した場合、弁孔Ｄを介して一次側通路Ａの水圧を受ける弁体３２は、図７に示されるように、リリーフスプリング３８の付勢力に抗して弁ロッド３１の挿入軸部３１ｅの外周面と摺動しながら開弁方向へ変位し、弁孔Ｄを開放するため、一次側通路Ａの水圧は二次側通路Ｂへ逃がされ、一次側通路Ａの異常な水圧上昇が防止される。 In the closed state shown in FIG. 6, when the water pressure in the primary passage A rises beyond an appropriate range for some reason such as freezing of the pipe, the water pressure in the primary passage A is received through the valve hole D. As shown in FIG. 7, the valve body 32 is displaced in the valve opening direction while sliding against the outer peripheral surface of the insertion shaft portion 31 e of the valve rod 31 against the urging force of the relief spring 38. Therefore, the water pressure in the primary side passage A is released to the secondary side passage B, and an abnormal increase in water pressure in the primary side passage A is prevented.

すなわち、この第三の形態でも、二次側通路Ｂの水圧を一定範囲に保つように動作する弁機構部３が、一次側通路Ａの水圧が適正範囲を超えて上昇したときにその水圧を二次側通路Ｂへ逃がす機能を兼備するため、図１６に示される従来技術のような第二弁機構部１２０を設ける必要がなく、簡素な構造とすることができる。 That is, also in this third embodiment, when the valve mechanism section 3 that operates so as to keep the water pressure of the secondary side passage B within a certain range, the water pressure of the primary side passage A rises beyond the appropriate range. Since it also has a function of escaping to the secondary passage B, it is not necessary to provide the second valve mechanism 120 as in the prior art shown in FIG. 16, and a simple structure can be achieved.

なお、図５〜図７に示される第三の形態では、弁体３２を弁ロッド３１のフランジ部３１ｄに押し付けているリリーフスプリング３８がコイルスプリングからなるものとしたが、コイルスプリングでは、一次側通路Ａの水圧を二次側通路Ｂへ開放するときの水圧値（開弁圧）高く設定することは困難であるため、このような場合は、図８に第三の形態の変更例を示すように、リリーフスプリング３８として皿ばねを採用することが好ましい。 In the third embodiment shown in FIGS. 5 to 7, the relief spring 38 that presses the valve body 32 against the flange portion 31 d of the valve rod 31 is a coil spring. Since it is difficult to set the water pressure value (opening pressure) high when the water pressure in the passage A is opened to the secondary passage B, in such a case, FIG. 8 shows a modified example of the third embodiment. Thus, it is preferable to employ a disc spring as the relief spring 38.

次に図９〜図１２は本発明に係る弁装置の第四の形態を示すもので、このうち図９は、弁ロッドの軸心を通る平面で切断して示す閉弁状態の断面図、図１０は、弁体を保持するホルダの平面図、図１１は、一次圧力逃がし時の状態を、ロッドの軸心を通る平面で切断して示す開弁状態の部分断面図、図１２は、図１１におけるXII−XIIで切断して示す部分断面図である。 Next, FIGS. 9-12 shows the 4th form of the valve apparatus based on this invention, Among these, FIG. 9 is sectional drawing of the valve closing state shown cut | disconnected and shown by the plane which passes along the axial center of a valve rod, FIG. 10 is a plan view of a holder for holding a valve body, FIG. 11 is a partial cross-sectional view of a valve opening state in which the state at the time of primary pressure relief is cut by a plane passing through the axis of the rod, and FIG. It is a fragmentary sectional view cut | disconnected and shown by XII-XII in FIG.

この第四の形態は、上述した各形態のようなリリーフスプリング３８を設けず、ゴム状弾性材料からなる弁体３２の変形機能を利用して一次圧力を逃がすことができるようにしたものである。 In the fourth embodiment, the relief pressure 38 is not provided as in each of the embodiments described above, and the primary pressure can be released using the deformation function of the valve body 32 made of a rubber-like elastic material. .

詳しくは、弁機構部３における弁体３２はゴム状弾性材料で平ワッシャ状に成形されたものであって、図９に示されるように、中央に弁ロッド３１の挿入軸部３１ｅが挿入される軸孔３２１ｂを有するシャーレ状の金属製のホルダ３２１に嵌合保持されると共に、弁ロッド３１の一端に形成された雄螺子３１ｂに螺合したナット３６と、前記弁ロッド３１の一端近傍に弁孔Ｄよりも小径に形成されたフランジ部３１ｄに当接され、弁座１５と対向している。図１０に示されるように、ホルダ３２１の底面３２１ａの円周方向少なくとも１個所には、軸孔３２１ｂから延びる切欠３２１ｃが形成されている。 Specifically, the valve body 32 in the valve mechanism section 3 is formed of a rubber-like elastic material into a flat washer shape, and an insertion shaft portion 31e of the valve rod 31 is inserted in the center as shown in FIG. The nut 36 is fitted and held in a petri dish-shaped metal holder 321 having a shaft hole 321 b and is screwed into a male screw 31 b formed at one end of the valve rod 31, and near one end of the valve rod 31. It abuts on a flange portion 31 d formed with a smaller diameter than the valve hole D and faces the valve seat 15. As shown in FIG. 10, a cutout 321c extending from the shaft hole 321b is formed in at least one circumferential direction of the bottom surface 321a of the holder 321.

その他の部分は、リリーフスプリング３８が存在しないほかは、第一の形態と同様に構成することができるが、第一の形態のように必ずしも弁体３２と弁座１５の互いのシール径を、弁ロッド３１のピストン部３１ａの外径、すなわちパッキン３５によるシール径より大きくしなくても良い。 Other portions can be configured in the same manner as in the first embodiment except that the relief spring 38 is not present, but the seal diameters of the valve body 32 and the valve seat 15 are not necessarily different as in the first embodiment. It is not necessary to make it larger than the outer diameter of the piston portion 31 a of the valve rod 31, that is, the seal diameter by the packing 35.

以上の構成を備える第四の形態も、弁機構部３による調圧（減圧）動作は、基本的には先に説明した各形態と同様であり、すなわち二次側通路Ｂの水圧が一次側通路Ａの水圧よりも低下した場合は、導圧路Ｆを介して二次側通路Ｂと連通した導圧室Ｇの水圧も低下するため、弁ロッド３１はメインスプリング３４の伸長力によって、弁体３２が弁座１５から離れる方向へ変位し、すなわち弁機構部３が開弁動作する。そしてこの開弁状態において、二次側通路Ｂの水圧が上昇した場合は、導圧室Ｇの水圧も上昇するので、ダイアフラム３３はメインスプリング３４を圧縮させる方向へ変位し、弁孔Ｄに対する弁体３２の開度が小さくなって、弁座１５と弁体３２との隙間を水が通過する際の圧力損失が大きくなるので、二次側通路Ｂの水圧が低下する。したがって、二次側通路Ｂの水圧の変動を抑制して一定範囲に保持することができる。 In the fourth embodiment having the above configuration as well, the pressure regulation (decompression) operation by the valve mechanism unit 3 is basically the same as the above-described embodiments, that is, the water pressure in the secondary passage B is the primary side. When the pressure in the passage A is lower than the water pressure in the passage A, the water pressure in the pressure guide chamber G communicating with the secondary side passage B via the pressure guide passage F is also reduced. The body 32 is displaced in a direction away from the valve seat 15, that is, the valve mechanism 3 is opened. In this valve open state, when the water pressure in the secondary passage B increases, the water pressure in the pressure guiding chamber G also increases, so that the diaphragm 33 is displaced in a direction in which the main spring 34 is compressed, and the valve with respect to the valve hole D is Since the opening degree of the body 32 decreases and the pressure loss when water passes through the gap between the valve seat 15 and the valve body 32 increases, the water pressure in the secondary passage B decreases. Therefore, the fluctuation | variation of the water pressure of the secondary side channel | path B can be suppressed and it can hold | maintain in a fixed range.

また、例えば二次側通路Ｂの下流側の流路が閉鎖されることによって、一次側通路Ａから弁孔Ｄ、弁座１５と弁体３２との隙間、弁室Ｃ及び二次側通路Ｂを経由してその下流側へ吐出される水の流れが止まった場合は、二次側通路Ｂの水圧が一次側通路Ａの水圧と同等になるので、二次側通路Ｂから導入される導圧室Ｇの水圧によって、ダイアフラム３３はメインスプリング３４を圧縮させる方向へ変位する。このため図９に示されるように、弁ロッド３１は弁体３２が弁座１５と密接する位置まで変位（閉弁）する。このとき、弁体３２はその全周が弁座１５と密接状態となっている。 Further, for example, by closing the downstream flow path of the secondary side passage B, the valve passage D, the clearance between the valve seat 15 and the valve body 32, the valve chamber C, and the secondary side passage B are closed from the primary side passage A. When the flow of water discharged to the downstream side through the water stops, the water pressure in the secondary side passage B becomes equal to the water pressure in the primary side passage A. Due to the water pressure in the pressure chamber G, the diaphragm 33 is displaced in a direction in which the main spring 34 is compressed. For this reason, as shown in FIG. 9, the valve rod 31 is displaced (closed) to a position where the valve body 32 is in close contact with the valve seat 15. At this time, the entire circumference of the valve body 32 is in close contact with the valve seat 15.

ここで、弁体３２はホルダ３２１の切欠３２１ｃの上に位置する部分３２ａが、ホルダ３２１の底面３２１ａによる支持を受けていない分、剛性が小さくなっているので、図９に示される閉弁状態において、配管の凍結など、何らかの原因により一次側通路Ａの水圧が適正範囲を超えて上昇した場合、弁孔Ｄを介して一次側通路Ａの高い水圧を受ける弁体３２は、この水圧によって、図１１及び図１２に示されるように前記切欠３２１ｃの上に位置する部分３２ａが撓んで弁座１５との間に隙間δを生じるので、この隙間δを通じて一次側通路Ａの水圧が二次側通路Ｂへ逃がされ、一次側通路Ａの異常な水圧上昇が防止される。 Here, since the valve body 32 is less rigid because the portion 32a located above the notch 321c of the holder 321 is not supported by the bottom surface 321a of the holder 321, the valve closing state shown in FIG. In this case, when the water pressure in the primary side passage A rises beyond an appropriate range due to some cause such as freezing of the pipe, the valve body 32 that receives the high water pressure in the primary side passage A through the valve hole D As shown in FIGS. 11 and 12, the portion 32a located on the notch 321c is bent to form a gap δ between the valve seat 15 and the water pressure in the primary passage A is secondary through the gap δ. The passage B is escaped, and an abnormal water pressure rise in the primary passage A is prevented.

すなわち、この第四の形態でも、二次側通路Ｂの水圧を一定範囲に保つように動作する弁機構部３が、一次側通路Ａの水圧が適正範囲を超えて上昇したときにその水圧を二次側通路Ｂへ逃がす機能を兼備し、しかもその動作を、弁体３２の変形を利用して行うため第一〜第三の形態のようなリリーフスプリングも不要となって、一層簡素な構造とすることができる。 That is, also in this fourth embodiment, when the valve mechanism section 3 that operates so as to keep the water pressure of the secondary side passage B within a certain range, the water pressure of the primary side passage A rises beyond the appropriate range. It has a function of escaping to the secondary passage B, and the operation is performed by utilizing the deformation of the valve body 32, so that the relief spring as in the first to third embodiments is not required, and the structure is simpler. It can be.

なお、上記構成において、一次側通路Ａの水圧がどの程度まで増大したときに弁体３２が水圧開放動作を行うかは、ホルダ３２１の切欠３２１ｃの幅や、弁体３２の肉厚などの変更によって、切欠３２１ｃの上に位置する部分３２ａの剛性を調整することで、適切に設定することができる。 In the above configuration, the extent to which the water pressure in the primary passage A increases when the valve body 32 performs the water pressure releasing operation depends on the width of the notch 321c of the holder 321 and the thickness of the valve body 32. By adjusting the rigidity of the portion 32a located on the notch 321c, it can be set appropriately.

次に図１３〜図１５は本発明に係る弁装置の第五の形態を示すもので、このうち図１３は、弁ロッドの軸心を通る平面で切断して示す閉弁状態の断面図、図１４は、弁体を保持するホルダの平面図及び側面図、図１５は、一次圧力逃がし時の状態を、図１３におけるXV−XVで切断して示す部分断面図である。 Next, FIGS. 13 to 15 show a fifth embodiment of the valve device according to the present invention, in which FIG. 13 is a cross-sectional view in a closed state shown by cutting along a plane passing through the axis of the valve rod, FIG. 14 is a plan view and a side view of a holder for holding the valve body, and FIG. 15 is a partial cross-sectional view showing a state when the primary pressure is released by cutting along XV-XV in FIG.

この第五の形態も、基本的には上述した第四の形態と同様、ゴム状弾性材料からなる弁体３２の変形機能を利用して一次圧力を逃がすことができるようにしたものである。 In the fifth embodiment, the primary pressure can be released basically by utilizing the deformation function of the valve body 32 made of a rubber-like elastic material, as in the fourth embodiment described above.

詳しくは、弁機構部３における弁体３２はゴム状弾性材料で平ワッシャ状に成形されたものであって、図１３に示されるように、中央に弁ロッド３１の挿入軸部が挿入される軸孔３２１ｂを有するシャーレ状の金属製のホルダ３２１に嵌合保持されると共に、弁ロッド３１の一端に形成された雄螺子３１ｂに螺合したナット３６と、前記弁ロッド３１の一端近傍に弁孔Ｄよりも小径に形成されたフランジ部３１ｄに当接され、弁座１５と対向している。ホルダ３２１の底面３２１ａ側を向いた弁体３２の下面３２ｂの円周方向少なくとも１個所には、半径方向へ延びる帯状溝３２ｃが形成されている。その他の部分は、第四の形態と同様に構成することができる。 Specifically, the valve body 32 in the valve mechanism section 3 is formed of a rubber-like elastic material into a flat washer shape, and an insertion shaft portion of the valve rod 31 is inserted in the center as shown in FIG. A nut 36 that is fitted and held in a petri-shaped metal holder 321 having a shaft hole 321 b and screwed into a male screw 31 b formed at one end of the valve rod 31, and a valve near one end of the valve rod 31. It abuts on a flange portion 31 d formed with a smaller diameter than the hole D and faces the valve seat 15. A strip-like groove 32c extending in the radial direction is formed in at least one circumferential direction of the lower surface 32b of the valve body 32 facing the bottom surface 321a side of the holder 321. Other parts can be configured in the same manner as in the fourth embodiment.

以上の構成を備える第五の形態も、基本的には上述した第四の形態と同様の流路開閉動作及び二次側通路Ｂの水圧の変動を抑制して一定範囲に保持する調圧動作を行うものである。 The fifth embodiment having the above configuration is basically the same flow path opening / closing operation as that of the above-described fourth embodiment, and the pressure regulating operation for suppressing the fluctuation of the water pressure in the secondary passage B and keeping it within a certain range. Is to do.

そして弁体３２は、帯状溝３２ｃが形成された部分３２ａがホルダ３２１の底面３２１ａに支持されていないので、図１３に示されるように、弁体３２の全周が弁座１５と密接されている閉弁状態において、配管の凍結など、何らかの原因により一次側通路Ａの水圧が適正範囲を超えて上昇した場合、弁孔Ｄを介して一次側通路Ａの高い水圧を受ける弁体３２は、この水圧によって、図１５に示されるように帯状溝３２ｃが形成された部分３２ａが撓んで弁座１５との間に隙間δを生じるので、この隙間δを通じて一次側通路Ａの水圧が二次側通路Ｂへ逃がされ、一次側通路Ａの異常な水圧上昇が防止される。 And since the part 32a in which the strip | belt-shaped groove | channel 32c was formed is not supported by the bottom face 321a of the holder 321, the valve body 32 has the perimeter of the valve body 32 closely_contact | adhered with the valve seat 15 as FIG. In the closed state, when the water pressure in the primary side passage A rises beyond an appropriate range for some reason, such as freezing of the pipe, the valve body 32 that receives the high water pressure in the primary side passage A through the valve hole D is As shown in FIG. 15, the water pressure causes the portion 32a in which the belt-like groove 32c is formed to bend and form a gap δ between the valve seat 15 and the water pressure in the primary passage A is secondary through the gap δ. The passage B is escaped, and an abnormal water pressure rise in the primary passage A is prevented.

すなわち、この第五の形態でも、二次側通路Ｂの水圧を一定範囲に保つように動作する弁機構部３が、一次側通路Ａの水圧が適正範囲を超えて上昇したときにその水圧を二次側通路Ｂへ逃がす機能を兼備し、しかもその動作を、弁体３２の変形を利用して行うため第一〜第三の形態のようなリリーフスプリングも不要となって、一層簡素な構造とすることができる。 That is, also in the fifth embodiment, the valve mechanism section 3 that operates so as to keep the water pressure in the secondary side passage B within a certain range, reduces the water pressure when the water pressure in the primary side passage A rises beyond the appropriate range. It has a function of escaping to the secondary passage B, and the operation is performed by utilizing the deformation of the valve body 32, so that the relief spring as in the first to third embodiments is not required, and the structure is simpler. It can be.

なお、上記構成において、一次側通路Ａの水圧がどの程度まで増大したときに弁体３２が水圧開放動作を行うかは、弁体３２の帯状溝３２ｃの幅や深さなどの変更によって、帯状溝３２ｃが形成された部分３２ａの剛性を調整することで、適切に設定することができる。 In the above configuration, how much the water pressure in the primary passage A increases when the valve body 32 performs the water pressure releasing operation depends on the change in the width and depth of the belt-like groove 32c of the valve body 32. It can set appropriately by adjusting the rigidity of the part 32a in which the groove | channel 32c was formed.

１ボディ
１５弁座
２ボトム
２２筒状部
２３調整螺子（調整手段）
３弁機構部
３１弁ロッド
３１ａピストン部
３２弁体
３２ｃ帯状溝
３２１ホルダ
３２１ｃ切欠
３３ダイアフラム
３４メインスプリング
３８リリーフスプリング
Ａ一次側通路
Ｂ二次側通路
Ｃ弁室
Ｄ弁孔
Ｅシリンダ部
Ｆ導圧路
Ｇ導圧室 DESCRIPTION OF SYMBOLS 1 Body 15 Valve seat 2 Bottom 22 Cylindrical part 23 Adjustment screw (Adjustment means)
3 valve mechanism 31 valve rod 31a piston 32 valve body 32c strip groove 321 holder 321c notch 33 diaphragm 34 main spring 38 relief spring A primary side passage B secondary side passage C valve chamber D valve hole E cylinder part F pressure guiding passage G Pressure chamber

Claims

Consists of a body, a bottom, and a valve mechanism disposed between the body and the bottom ,
The body has a dish-shaped support part opened upward, a lower cylinder part opened downward, and a cylindrical first joint part opened in a direction perpendicular to the opening direction of the dish-like support part and the lower cylinder part And a second joint part,
The bottom is fixed so as to close the lower cylindrical portion of the body,
Inside the body are a primary side passage extending from an inner circumference of the first joint portion to an inner circumference of the body, a secondary side passage formed on the inner circumference of the second joint portion, and the lower cylindrical portion. is formed by inner and the bottom of the valve chamber which is contiguous with the second-side passage located on the boundary of the primary passage and the secondary passage, communicate with each other the valve chamber and the primary side passage A valve hole, an annular valve seat located at an end of the secondary passage in the valve hole , a pressure guiding chamber formed in an inner circumferential space of the dish-like support part, and coaxial with the valve hole A cylinder portion having one end opened to the opposite side to the valve hole in the primary passage and the other end opened to the pressure guiding chamber, and a guide communicating the secondary side passage and the pressure guiding chamber with each other. A pressure path is formed,
The valve mechanism is disposed to be axially reciprocated through the cylinder portion and the valve hole, the piston portion is formed in the insertion portion to the cylinder portion, the outer peripheral surface and the cylinder of the piston portion and the valve rod clearance which is sealed by the packing between the parts, a valve body which is separable therefrom opposite to the valve seat attached to one end of the valve rod while being disposed in said valve chamber, said body An inner diameter hole into which the piston part of the valve rod can be inserted on the inner circumference side, a pressure introduction hole and a pressure introduction groove formed on the outer circumference side, and an inner diameter part Is a disc-shaped diaphragm which is coupled to the end of the valve rod opposite to the valve body and whose outer diameter is fixed in close contact with the end surface of the dish-shaped support, and the valve rod is connected to the valve seat Energizing the valve body in the separating direction That includes a main spring, and a relief spring for urging the valve rod to approaching direction of the valve body relative to the valve seat,
The pressure guiding chamber is in an inner circumferential space of the dish-like support portion in the body and is defined between the plate and the diaphragm, and the pressure guiding hole and the pressure guiding groove of the plate and the body Communicated with the secondary passage through the pressure guiding path,
The diaphragm displaces the valve rod in the approaching direction of the valve body with respect to the valve seat by the pressure of the secondary side passage introduced into the pressure guiding chamber via the pressure guiding path,
A valve device characterized in that a mutual seal diameter of the valve body and the valve seat is larger than a mutual seal diameter of the cylinder part and the piston part .

Having an adjusting means for adjusting a load of the relief spring, thereby, the pressure of the primary side passage to claim 1, characterized in that a settable valve opening pressure when the miss to the second-side passage The valve device described.

In the plate, a plurality of circumferentially engaged holes extending in an arc shape on the outer peripheral side of the inner diameter hole, and a plurality of circumferential pressure guiding holes extending in an arc shape on the outer side are opened, Engaging ribs extending in the radial direction are formed between the engaged holes and between the pressure introducing holes, and a pressure guiding groove communicating with the pressure guiding holes is formed on the lower surface thereof. The valve device according to claim 1 or 2, characterized by the above .