HS4D-ACT Hansen Suitable for Ammonia, CO2, R22, R134a and Other Approved Refrigerants

The HS4D Two Step Solenoid Valve is based on the same strength, reliability, design principles and craftsmanship as the standard Hansen HS4A Solenoid Valve—with added versatility and safety. The use of two step solenoid valves may help to reduce the potential for hydraulic shock. Please refer to IIAR bulletin number 116. The two step solenoid design provides two opening positions for the valve: soft opening/soft closing position (10% rated flow) and fully open. These valves are normally closed and will revert to the closed position in the event of a power failure. Full flow capacity is the same as the standard Hansen HS4A. This makes it ideal for drop-in replacement of existing solenoid valves. Similar to the standard HS4A, the HS4D is superior in its ability to overcome dirt and sticky oil during opening, as well as function in an oil-free "dry" system.

Application

The Hansen HS4D is a reliable, rugged-bodied valve that can be used anywhere a soft opening or closing solenoid valve is desired. The HS4D should not be applied as a two capacity valve for liquid feed applications, but rather as a soft opening/soft closing valve. The partially open position is designed to gradually introduce liquid flow before switching to the fully open position. Additionally, the two step solenoid valve can be used to gradually slow liquid flow prior to fully closing the valve to minimize hydraulic shock. When used as a hot gas defrost valve, the partially open position allows gradual equalization of hot gas during defrost before fully opening the valve. The HS4D can also be used as a suction solenoid and equalizing valve. After the conclusion of defrost, the partially open valve position can equalize (bleed) gas from the evaporator. After proper bleed time, the valve can be placed in the Full Open position.

Features:

• "Soft" opening and closing
• Tolerant of dry systems
• Teflon main & pilot seats
• Heavy duty, pilot operation
• 300 psi MOPD (20 bar), 500 psi (34 bar) for CO2
• Simple serviceable design
• Available close-coupled strainer/check valve
• CSA certified
• CE available
• Beacon pilot lights available
• Flange-to-flange drop-in replacement for standard HS4A
• Flanged or weld-in valve body available
• All Hansen manual opening stems are "OUT" for automatic operation