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 2-Way Normally Closed (IDV)
WHAT IS IT? This 2-way valve is a member of our Inert Valve Series. It is a poppet style with diaphragm isolation.
The materials of all “wetted” surfaces are inert, and are impervious to a wide range of aggressive fluids. The body is made of Ultem® polyetherimide. This polymer performs well at high temperature and pressure conditions, is biocompatible and FDA approved, and is applicable in numerous biomedical and biomechanical applications. Radel® polyphenylsulfone is an alternate available material. The wetted area is isolated from the solenoid by a diaphragm which is also inert. Material choices for this element include ethylene propylene (EPDM) and fluorocarbon (FKM), depending on fluid compatibility and temperature requirements.
Liquid flow rates up to 1.7 liters per minute at 2 psi differential are common. The valve is rated as bubble tight against 40 psi differential in either direction. Five port configurations (shown on the reverse side) offer a choice of manifold, line connections and 5/16'' (8mm) quick disconnect. Mounting configurations include clamped body and accommodation for both metric and English.
The low power solenoid features low noise characteristics in a fully encapsulated configuration. The valve is impervious to external splash by corrosive fluids. Wire lead and spade terminations are available. The valve diaphragm is configured to sweep debris, precipitates and particles away from the seat, preventing leakage and damage to critical surfaces. The valve features a rolling diaphragm. This avoids failure modes including precipitate and debris accumulation associated with a bellows style diaphragm. |
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HOW DOES IT WORK?
In the de-energized condition, the poppet is held in the closed position by a return spring. When the valve is energized, the armature moves to the open position, overcoming the spring force and any forces due to pressure or vacuum.
The valve is configured to accommodate precipitates common to some systems without compromising performance. The materials are selected for compatibility with a wide range of temperatures and fluids. |
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HOW IS IT USED?
Hemodialysis equipment and instrumentation applications are ideal choices for this valve, due to material compatibility, temperature range and particulate tolerance.
Dialysate, bicarbonates, organic fluids, many acids and even aggressive disinfecting fluids such as bleach and Renalin® are all within this valve’s compatibility range. The quiet operations makes this valve a choice when multiple functions are continually cycled on the application. In complex circuits, this valve may be used in flow balancing, mixing, collecting, cleaning and pumping circuits.
This valve family is applicable where no metals are permitted in the flow path, preventing hardware corrosion and contamination of the controlled fluids. |
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