Humphrey Products Company's new line of compact flat armature Spider Valves provides a fast response time with very low friction and high-cycle life. Designed for insertion into a sub-base or custom manifold, the 2-way and 3-way direct-actuated valves come in 7, 15 and 21 mm diameter sizes in both normally closed and normally open versions.
In contrast to solenoid valves where the core moves into the magnetic coil, the Spider Valve's flat armature is pulled against the magnetic yoke in the energized position. In the de-energized position, a leaf spring positions the armature's integrated sealing element against the valve seat. The flat armature design provides a very low-mass moving element that enables switching times in the millisecond (ms) range. By avoiding the inherent friction in a solenoid core design, the flat armature valve achieves close to frictionless movement with cycle life as high as 109 cycles depending upon the application.
Driven with current pulses in a pulse width modulation mode, the units operate as quasi-proportional valves to obtain variable flow rates. With power consumption as low as 0.5W for the 7 mm unit, the valves address a number of flow applications where small size and low power is important, including neutral and mildly aggressive liquids, gases and vapors.
For example, the direct actuated, normally-closed VA 204-7 two-way solenoid valve has a 7 mm diameter with an orifice of 0.3, 0.5, 0.8, or 1 mm to handle corresponding pressure ranges from 0 to 10, 0 to 8, 0 to 6, or 0 to 3 bar. Rated for a maximum ambient temperature of 50C, the units have a cycle time of 0.5 to 4 ms and handle a medium with a maximum viscosity of 21 mm²/s, a maximum static pressure of 20 bar, and a maximum operating frequency of 500 cps.
For more information on the Spider Valves check out: http://rbi.ims.ca/4927-511
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 The magnetic yoke pulls the flat armature in the energized position and a leaf spring presses the armature with its integrated sealing element against the valve seat in the de-energized position.
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