| 摘要 |
PROBLEM TO BE SOLVED: To provide a check valve having simple construction for reliably and efficiently discharging fluid. SOLUTION: The check valve comprises a hollow cylindrical member 1 having a discharge port 1a in one end and a distribution port A for fluid to be distributive toward the discharge port 1a, and opened at the other end, a hollow cylindrical piston member 2 arranged slidably in a hollow portion of the hollow cylindrical member 1 in the axial direction, having a distribution port B in the side face for the fluid to be distributive, and having a top portion 2b forming a closed pressure receiving portion, a coil spring 3 arranged in the hollow portion of the hollow cylindrical member 1 on the downstream side of the piston member 2 for energizing the piston member 2 toward the upstream side, and a straightening vane 4 arranged on the downstream side of the coil spring 3. In this check valve, the piston member 2 is moved forward in the axial direction in response to pressure on the pressure receiving portion (the top portion 2b) to make the distribution port B communicative with the distribution port A. COPYRIGHT: (C)2009,JPO&INPIT
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