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The valve device has a valve main body defining a valve chest provided with a NO outlet port and a NC outlet port through which a fluid flows, and a valve for opening/closing the NC outlet port and NO outlet port. The valve includes a diaphragm disposed so as to cover the valve chest, and a drive me

The valve device has a valve main body defining a valve chest provided with a NO outlet port and a NC outlet port through which a fluid flows, and a valve for opening/closing the NC outlet port and NO outlet port. The valve includes a diaphragm disposed so as to cover the valve chest, and a drive means for pressing the diaphragm to open/close the NC outlet port and NO outlet port. The first valve seat and the second valve seat are formed around the NC outlet port and NO outlet port. The diaphragm is made of an elastic material of which JIS-K6253 durometer A hardness is A50-A85. The pressure of the diaphragm seated on the first valve seat and the second valve seat is 0.5-1.0 N/sq·mm.

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1. A valve device having a valve main body defining a valve chest having an inlet port for flowing a fluid into the valve chest, and a first outlet port and a second outlet port for flowing the fluid out from the valve chest;a valve for opening and closing the ports; anda drive means for driving the

1. A valve device having a valve main body defining a valve chest having an inlet port for flowing a fluid into the valve chest, and a first outlet port and a second outlet port for flowing the fluid out from the valve chest;a valve for opening and closing the ports; anda drive means for driving the valve to open and close the ports,wherein the ports have an opening around which a valve seat is formed,wherein the valve is disposed so as to cover the ports and has a diaphragm for seating on or separating from the valve seat to open and close the ports,wherein the diaphragm is made of an elastic material whose durometer A hardness in JIS-K6253 is A50 to A85,wherein the pressure of the diaphragm on the valve seat when seated is 0.5 to 1.0 N/sq·mmwherein the diaphragm is to open and close the first outlet port and the second outlet port alternately, andwherein the difference between the pressure of the diaphragm seated on the valve seat of the first outlet port and the pressure of the diaphragm seated on the valve seat of the second outlet port is not more than 0.40 N/sq·mm. 2. The valve device as set forth in claim 1, wherein the durometer A hardness in JIS-K6253 of the diaphragm is A60 to A80. 3. The valve device as set forth in claim 1, wherein the diaphragm includes, as a rubber component, at least one kind of ethylene-propylene-diene, fluorinated rubber, hydrogenated nitrile rubber, butylene rubber and silicone rubber. 4. The valve device as set forth in claim 1, wherein the diaphragm includes, as fillers, at least one kind of calcium carbonate, silica, barium sulfate, talc and carbon black. 5. The valve device as set forth in claim 1, wherein the valve is driven by a driving means to swing, and to open and close the ports. 6. The valve device as set forth in claim 5, wherein the valve is rotatably supported by a shaft member. 7. The valve device as set forth in claim 2, wherein the diaphragm includes, as a rubber component, at least one kind of ethylene-propylene-diene, fluorinated rubber, hydrogenated nitrile rubber, butylene rubber and silicone rubber. 8. The valve device as set forth in claim 2, wherein the diaphragm includes, as fillers, at least one kind of calcium carbonate, silica, barium sulfate, talc and carbon black. 9. The valve device as set forth in claim 3, wherein the diaphragm includes, as fillers, at least one kind of calcium carbonate, silica, barium sulfate, talc and carbon black.