{"product_id":"akv-20-4-042h2027-danfoss-electric-expansion-valve","title":"Vanne d'expansion électrique AKV 20-4 (042H2027) Danfoss","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAKV 20-4 (042H2027)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a high-capacity, electronically operated expansion valve designed for precise liquid injection in industrial and commercial refrigeration plants. Utilizing the Pulse Width Modulation (PWM) principle, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eDanfoss 042H2027 (042H2027)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efunctions as both an expansion device and a liquid line solenoid valve, providing a tight shut-off when de-energized. This dual-purpose design is essential for B2B industrial applications such as large-scale cold storage, industrial chillers, and supermarket rack systems, where maintaining an exact superheat (SH) is critical for energy efficiency and compressor safety. The AKV 20-4 is engineered to provide higher mass flow rates than the AKV 20-1\/2\/3 models, making it suitable for high-output evaporator units.\u003c\/p\u003e\n\u003ch3\u003eTechnical Configuration\u003c\/h3\u003e\n\u003cp\u003eThe AKV 20-4 is built around a robust 13.5 mm actuator system and is typically driven by a Danfoss ADAP-KOOL controller. Rather than modulating the needle position, the valve cycles fully open and fully closed; the flow rate is determined by the duration of the \"open\" phase within the cycle. This mechanical simplicity results in a hermetic construction capable of withstanding millions of cycles without degradation. With a Maximum Working Pressure (PS) of 28 bar (406 psig), it is compatible with a wide range of HFC and HCFC refrigerants. The \"Type 4\" designation represents the specific high-capacity orifice size within the AKV 20 series framework.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eFeature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAKV 20-4 (042H2027)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eDanfoss\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eElectric Expansion Valve (PWM)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eActuator System\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e13.5 mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMax Working Pressure (PS)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e28 bar (406 psig)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMax Test Pressure\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e42 bar\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eAmbient Temp Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-40 to 50 Celsius\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eNC (Normally Closed)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCompatible Refrigerants\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eR404A, R134a, R407C, R507, etc.\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4.8 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e6.0 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eTechnical FAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the specific advantages of PWM control for high-capacity systems?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIn high-capacity systems, PWM control ensures that when the valve is open, the refrigerant velocity remains high. This assists in efficient oil return to the compressor and optimizes heat transfer within the evaporator by maintaining a consistent turbulence level, which is often superior to the partial-throttling found in mechanical valves.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs an additional solenoid valve required for system safety?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The AKV 20-4 is a Normally Closed (NC) valve that provides a reliable, hermetic seal when the power is removed. This eliminates the hardware costs and pressure drops associated with installing an extra solenoid valve in the liquid line.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the internal orifice be replaced?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe AKV 20 series features a modular design where the orifice and needle assembly can be serviced or replaced if necessary, ensuring the valve body remains in place while restoring the valve to its original factory performance.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eEngineering \u0026amp; Installation Guide\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eUpstream Filtration:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDue to the rapid cycling nature of PWM valves, it is mandatory to install a high-quality filter drier (such as the Danfoss DML or DCL series) immediately before the valve. Debris in the liquid line can cause rapid wear on the valve seat or prevent the needle from sealing properly, leading to \"flooding.\"\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eBrazing Thermal Protection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDuring installation of the solder connections, the valve body must be protected from excessive heat. Wrap the body in a wet cloth and ensure that the temperature of the 13.5 mm actuator housing does not exceed 100 Celsius. Overheating will damage the internal seals and the coil interface.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eElectrical Configuration:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEnsure the coil voltage matches the output of your Danfoss AK-CC or AKC controller. The coil must be mounted with the cable entry pointing downwards (creating a drip loop) to prevent moisture from traveling along the wire and into the actuator assembly.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Danfoss","offers":[{"title":"Default Title","offer_id":53102414659947,"sku":"042H2027","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/042h2027-muhyt14ocjb.png?v=1776136896","url":"https:\/\/www.plcprotech.com\/fr\/products\/akv-20-4-042h2027-danfoss-electric-expansion-valve","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}