A One-Way valve">

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	A One-Way valve, what for ? by christophe-masclet@noos.fr There are many ways to use the one-way valve and here are some examples. In example 1, an old LEGO pump (that blows and sucks) is connected to 2 one-way valves . In such a circuit, the 2 one-way valves operate as an old « pneumatic diode » and separate sucked air from blown air, as it was in the old Lego pneumatic system. Note that you can replace the old pump by a present-day 48mm cylinder or a small cylinder, it will work the same but it won’ t work with a present-day pump.   In example 2 the one-way valve is used to insulate 2 pneumatic circuits connected to the same pump. OK! this is the real reason why I’ve build this one-way valve. The F-T solenoid valve allows only 2 positions, open or close, but it does not have a neutral position like the LEGO pneumatic switch. It results that in such pneumatic circuit all cylinders would be linked together and would all depend on the whole circuit pressure. In the picture you can see the 2 one-way valves which insulate the 2 pneumatic cylinder circuits. It means that when the F-T solenoid act on the first block, pressure could fade but it won’t affect the second block, it is the alternative to the neutral position. There are many other uses for this home-build pneumatic element, for example, Kevin L. Clague thinks about using them to build a non-mechanical OR gate. THE SCOOP: Fischertechnik also sells a similar piece, it is called « non-return » valve ref: 36970, price is about 5 US $, it would be LEGO compatible but pay attention to the tube connection. Previous Home Next