| 摘要 |
PROBLEM TO BE SOLVED: To provide a structurally simple integrated motor-operated check valve that integrates an on-off valve and a check valve and combines the respective functions. SOLUTION: The integrated motor-operated check valve comprises a valve element 4 in the form of a polygonal prism for closing or interconnecting an upstream passage 1a and a downstream passage 1b, a casing 1 having the upstream passage, the downstream passage and a valve element chamber 19 formed therebetween to hold the valve element fitted in slidably in a height direction, an urging means 10 for urging the valve element to the closing position until water pressure in the upstream passage exceeds a given value, an electric valve drive means 17, 18 having driving force for moving the valve element arbitrarily to the closing position while in an off state, and a stem rod 16 used to transmit the driving force of the valve drive means to the valve element and while in an on state, moved to a noncontact position leaving a space over which the valve element is movable to the interconnecting position. A steady operational state sets the valve drive means on to offer a function as a check valve, and a starting state and a stopping state control the valve drive means to offer a function as a motor-operated on-off valve.
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