AKV 20-1 (042H2022) Danfoss Electric Expansion Valve

Product Overview

The AKV 20-1 (042H2022) is a high-precision, electronically operated expansion valve designed specifically for refrigeration plants. Functioning as both an expansion valve and a solenoid valve, the Danfoss 042H2022 (042H2022) utilizes a pulse-width modulation (PWM) principle to regulate refrigerant injection into the evaporator. This dual-functionality allows for extremely tight superheat control, which is essential for maximizing energy efficiency and protecting compressors in B2B industrial cooling applications, such as cold storage, supermarkets, and process chilling. Its robust construction ensures reliable performance even in low-temperature environments down to -40 Celsius.

Technical Configuration

The AKV 20-1 belongs to the AKV 20 series of high-capacity valves. Unlike standard modulating valves, the 042H2022 operates by opening and closing fully in rapid cycles. The ratio between the open and closed time determines the amount of refrigerant delivered. The valve features a 13.5 mm actuator system and is designed to be driven by a Danfoss ADAP-KOOL controller. The internal orifice and needle assembly are engineered for durability, capable of withstanding millions of cycles. With a Maximum Working Pressure (PS) of 28 bar (406 psig), it is compatible with a wide range of fluorinated refrigerants (HCFC/HFC), providing a hermetic and fail-safe expansion solution.

Technical Specifications

Technical FAQs

How does PWM technology benefit refrigeration systems?

Pulse-width modulation allows the valve to react instantly to load changes. By rapidly cycling, the AKV 20-1 provides a more stable superheat than traditional mechanical valves, leading to higher evaporator efficiency and lower energy consumption.

Is a separate solenoid valve required for liquid line shut-off?

No. Because the AKV 20-1 is a Normally Closed (NC) valve that provides a tight seal when de-energized, it acts as a liquid line solenoid valve, simplifying the system piping and reducing the number of components.

What controllers are compatible with the 042H2022?

The valve is designed to work with the Danfoss AKC or AK-CC (ADAP-KOOL) series controllers, which provide the high-frequency PWM signal necessary for precision regulation.

Engineering & Installation Guide

• Piping and Filtration: Install a filter drier (e.g., Danfoss DML or DCL) immediately upstream of the AKV 20-1. PWM valves are sensitive to debris; even small particles can interfere with the rapid seating of the needle, leading to internal leakage or erratic regulation.

• Thermal Protection: When soldering the valve into the liquid line, the valve body must be wrapped in a wet cloth. Ensure the body temperature stays below 100 Celsius to prevent damage to the internal seals and the 13.5 mm actuator assembly.

• Coil and Mounting: Ensure the correct Danfoss AKV coil is used (standard AC or DC options available). The coil should be mounted with the cable entry pointing downwards to prevent moisture ingress. For best results, mount the valve in a horizontal pipeline with the coil in the upright vertical position.