Expansion valves PWM
Solenoid expansion valve Castel type 2028 regulates the refrigerant flow into the evaporator by modulating the opening time phase of the plug and so permitting a wide range of power.
This valve must be used with a coil type HM4, controlled by an electronic regulator device (not supplied by Castel).
This valve is most frequently used in refrigeration systems, in particular refrigerated cabinets in the supermarket, which use the following refrigerant fluids: R22, R134a, R404A, R407C ; R410A, R507 proper to the Group II (as defined in Article 9, Section 2.2 of Directive 97/23/EC and referred to in Directive 67/548/EEC).
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