JPH0198373U

JPH0198373U -

Info

Publication number: JPH0198373U
Application number: JP19349287U
Authority: JP
Priority date: 1987-12-22
Filing date: 1987-12-22
Publication date: 1989-06-30

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例に係る逆止弁の縦断
面図、第２図は第１図に示した逆止弁の半面を省
略した正面図、第３図は第１図に示した逆止弁の
一部を切欠いた平面図、第４図は本考案の要部を
示す横断面図、第５図は第４図のＡ―Ａ矢視断面
図、第６図ａ〜ｃはそれぞれ弁閉止時、弁中開時
、弁全開時における第４図に示したアームとシヤ
フトの接続状態を示す概略図、第７図は本考案の
他の実施例を示す逆止弁の縦断面図、第８図は第
７図のＣ部拡大図、第９図は逆止弁の従来例を示
す縦断面図、第１０図は第９図に示した逆止弁の
半面を略した正面図、第１１図は第９図に示した
逆止弁の一部を切欠いた平面図、第１２図は従来
逆止弁に用いられていた開閉検査装置を示す系統
図である。２０，３０……逆止弁、２１，３１……弁箱、
２２……第１の連通孔、２３……第２の連通孔、
２４……シヤフト、２５……溝、３２……第３の
連通孔、３３……第４の連通孔。 FIG. 1 is a longitudinal cross-sectional view of a check valve according to an embodiment of the present invention, FIG. 2 is a front view of the check valve shown in FIG. 1 with one half omitted, and FIG. 4 is a cross-sectional view showing the main parts of the present invention, FIG. 5 is a sectional view taken along the line A--A in FIG. 4, and FIGS. 6 a to c are schematic diagrams showing the connection states of the arm and shaft shown in FIG. 4 when the valve is closed, when the valve is halfway open, and when the valve is fully open, respectively, and FIG. 7 is a longitudinal cross-section of a check valve showing another embodiment of the present invention. 8 is an enlarged view of part C in FIG. 7, FIG. 9 is a vertical cross-sectional view showing a conventional example of a check valve, and FIG. 10 is a half side of the check valve shown in FIG. 9. 11 is a partially cutaway plan view of the check valve shown in FIG. 9, and FIG. 12 is a system diagram showing an opening/closing inspection device conventionally used for check valves. 20, 30... Check valve, 21, 31... Valve box,
22...first communication hole, 23...second communication hole,
24...Shaft, 25...Groove, 32...Third communication hole, 33...Fourth communication hole.

Claims

[Claims for Utility Model Registration] (1) A check valve consisting of a valve box and a valve body disposed inside the valve box to block the flow of fluid from the outlet direction of the valve box, A check valve characterized by integrally forming a communication part that communicates an inlet part and an outlet part of a valve box. (2) The communication portion is characterized by comprising a communication hole that is bored in the valve box and communicates the inlet and outlet of the valve case, and an opening degree adjusting device that adjusts the degree of opening of the communication hole. The check valve according to claim 1 of the utility model registration claim.