To provide a backflow preventing device with check valves easy to mount/demount, having improved durability by supporting and fixing the check valves into a valve box in a stable and firm state.
The backflow preventing device comprises the valve box 1 having a suction port 2 and a discharge port 3, and the unit-structure primary side check valve 5 and the unit-structure secondary side check valve 6 removably provided in the valve box 1 for opening/closing the suction port 2 and for opening/closing the discharge port, respectively. In this case, a supporting member 38 is provided in the valve box 1 between both check valves 5, 6. The supporting member 38 has a retaining member 39 for abutting on one check valve 5 and a retaining member 40 for abutting on the other check valve 6. A set screw 44 is provided on the retaining member 39. The fastening of the set screw 44 presses the supporting member 38 against both check valves 5, 6 to fix both check valves 5, 6 into the valve box 1.
SAKATANI TETSUNORI
JPH0412556U | 1992-01-31 | |||
JP2003014147A | 2003-01-15 | |||
JPH1182776A | 1999-03-26 | |||
JPS63180777U | 1988-11-22 | |||
JP2004360820A | 2004-12-24 | |||
JPH0412556U | 1992-01-31 | |||
JP2003014147A | 2003-01-15 | |||
JPH1182776A | 1999-03-26 | |||
JPS63180777U | 1988-11-22 | |||
JP2004360820A | 2004-12-24 |
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto