Clippard Electronic Needle Valves

At the pressure determined by spring compression, system pressure overcomes spring pressure and the relief valve opens. The fuel flows back to the tank without any pressure. Installations with a fixed bleed from the D chamber connected to the vapor vent in the fuel inlet by a short external line should show an initial ejection of fuel and air followed by a continuing small stream of fuel. These actuators translate an air signal into valve stem motion by air pressure acting on a diaphragm or piston connected to the stem. Floating ball valve with elastic lip

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