The Sporlan SPW line of electric expansion valves uses pulse width modulation (PWM) technology to control refrigerant flow in direct expansion refrigeration systems. The valve's duty cycle is varied based on measured evaporator superheat. Typical controllers monitor superheat and vary the duty cycle across a 6 second interval. Sporlan's Pulse Width Modulation Valves are rated at 100% duty cycle, no reserve capacity. Pulse Width Modulation Valves are typically sized between 50% and 85% duty cycle. This allows additional capacity for pulldown at start-up and after defrost. Further consideration should be given to the liquid line size to avoid excessive liquid hammer. Liquid line velocity should not exceed 3 ft/second. The SPW valve family offers 8 port sizes to cover a wide range of evaporator loads.

• Controls refrigerant by cycling on/off during 6 second intervals
• Designed for CO2, HFC, HCFC and HFO (non-flammable & non-toxic) System Operation
• Operates from 100% to 10% of rated capacity
• Tight seating design
• Robust Design, 50 Million + Cycle Life
• Low Wattage NEMA-4X Coil, IP65 Rated
• Brass, Copper & Stainless Steel Design for Premier Corrosion Resistance
• Serviceable Design with Interchangeable Port & Strainer