| 摘要 |
A through-flow anti-siphoning valve device (70) adapted to be mounted in an environment having an ambient pressure level (PA60); the valve device comprising: a valve housing (100, 200) having: an input (210) for connection to a fluid supply piping system (35, 72) having a fluid supply pressure level (PO; PO1; P35:1) for delivery of a first fluid; an output (220A) for attachment to a valve unit part (45B); and a housing body (100, 200, 130) positioned between the input (210) and the output (220), said housing body forming a first channel (105) for connecting the input (210) with the output (220); and a valve unit (130) having a transit channel (180) communicating with said environment, a first valve seat (140, 241), and a movable valve member (131) having a first valve member surface (132, J, K) facing the first channel (105) and a second valve member surface (133) facing the transit channel entry and the first valve seat (140, 241), and wherein the valve unit (130), in operation, is capable of switching between a first state and a second state dependent on a force difference (DeltaF) between a first force (Fl) dependent on fluid pressure (PF, Po, P410) acting on said first valve member surface (132, J, K), and a second force (F2) dependent on fluid pressure (PA) acting on said second valve member surface (133), wherein the output (220A) comprises another valve seat enclosing an outlet orifice, said outlet orifice constituting an outlet end of the channel (105); wherein said another valve seat is shaped so as to enable sealingly meeting a second movable valve member for controlling a flow of said first fluid through said outlet orifice. |
