Danfoss 034L0143 Gas Regulator

The Danfoss 034L0143 (KVC 12) is a professional-grade hot gas bypass regulator engineered to maintain stable evaporator pressure by modulating compressor capacity. This 1/2" ODF solder-connection valve is essential for systems where low-load conditions could lead to coil frosting or short-cycling. With a regulation range of 3 to 87 psig and a factory setting of 29 psig, the KVC 12 provides precise control across high and low-temperature applications. It features a maximum working pressure (MWP) of 406 psig and a Cv value of 0.79 gal/min, making it a reliable solution for modulating refrigerant flow in commercial refrigeration and HVAC units. Built for versatility, it is compatible with a wide array of CFC, HCFC, and HFC refrigerants, including R134a, R22, R404A, R407C, and R507. The robust damping design eliminates pulse-related vibrations, ensuring long-term seat tight integrity and system stability in oil-free or standard lubricant environments.

• System Stability: Prevents evaporator icing and suction pressure drops during low-load periods by bypassing hot gas to the low-pressure side.
• Broad Compatibility: UL-listed for modern refrigerants including R1234ze(E) and R513A, facilitating seamless integration into eco-friendly retrofits.
• Rugged Construction: Designed to withstand extreme medium temperatures ranging from -49°F to 266°F, ensuring performance in demanding mechanical rooms.
• Solder Connection: 1/2" ODF connections allow for a secure, leak-proof installation in standard copper piping systems.
• Compact Form Factor: The KVC 12's small footprint allows for easier installation in tight compressor racks and condensing units.

Where should the KVC 12 be installed for maximum efficiency?
For optimal hot gas bypass, the regulator should be installed in a bypass line between the discharge side and the suction side of the system, typically discharging into the evaporator inlet or suction line via a liquid-gas mixer.

Can the pressure setting be adjusted in the field?
Yes, the Danfoss KVC 12 pressure setting is adjustable. Remove the protective cap and turn the setting screw to reach the desired suction pressure required for your specific application.

Is this regulator compatible with oil-free systems?
Correct. This Danfoss regulator is designed to operate in oil-free applications, making it suitable for systems utilizing magnetic bearing compressors or other oil-less technologies.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.