Overall dimensions and technical information are provided solely for informative purposes and may be modified without notice 1 Air distribution Valves and solenoid valves poppet system 1 | 254 Series F300 - Solenoid valves for fluids Designation Trade names General characteristics Field of use FPM (Fluorocarbon VITON TECNOFLON FLUOREL For general use up to 130 °C Sealing materials Servo actuated With large-sized passage orifices, the static pressure value that needs to be overcome by the magnetic field produced by the coil increases. These solenoid valves are used to control high-pressure values with large diameter bores. In these models, the fluid helps in the opening or closing of the main plunger. They can be normally closed (2/2 NC) and have an input and a utilisation connection machined into the valve body and at rest the fluid is intercepted by the main plunger, which can be either diaphragm or a piston. In this condition, the fluid acts on both faces of the main plunger though a pinhole contributing to closure of the plunger. Applying electrical power, the secondary, or pilot, orifice opens leading to the exhaust of the fluid, which acts to close the main plunger. Greater force is thus applied when opening, the plunger is raised from the orifice and allows the media to flows to the output. In these versions, performance does not depend solely on the magnetic field produced by the coil; a minimum input pressure is also needed so as to move the diaphragm or the piston overcoming its rigidity and to keep it raised from the main orifice. (∆p minimum performance). They can be normally open (2/2 NA), and have an input and output connection machined into the valve body, and at rest the secondary plunger communicates with output, a minimumpressure difference between the feed and the output causes the main shutter to rise, leading to it opening. Applying electrical power, the secondary orifice closes and equilibrium between the pressure on the two faces of the main shutter is reinstated, and so it returns to its closed position on the main orifice. In this version a minimum working pressure is also needed. A synthetic hexa-fluoropropylene-based elastomer. Excellent resistance to high temperatures. Excellent resistance to ozone, oxygen, mineral oils, synthetic hydraulic fluids, fuels, hydrocarbons and many chemical products. Not specific for superheated steam.
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