Thermostatic Expansion Valve

ref. Thermostatic Expansion Valve-1

RFKH Series thermostatic expansion valves are used to regulate refrigerant flow rate into the evaporator while controlling the refrigerant´s superheat at the outlet of the evaporator. They can be used for various refrigerants under all working conditions. Typical applications are refrigeration systems like commercial refrigerators and freezers, icemakers, air conditioners and dehumidifiers.



Air conditioning Commercial Refrigeration Heat Pump

Features

  • Stainless steel capillary and sensing bulb
  • Compact design with interchangable orifice
  • Valves with MOP function can be provided to assure reliable compressor operation
  • Thermal sensing bulb utilizes cross charge technology differential (MOPD)

General specifications

  • Applicable for all common HCFC and HFC refrigerants such as: R22, R134a, R404A, R407C, R410A, R507
  • Applicable medium temperature TS min/max: -40°C (-40°F)/+70°C (158°F)
  • Applicable ambient temperature: -35°C (-31°F) to +55°C (131°F)
  • Relative humidity: 0-100%RH
  • Maximum working pressure: 3.5MPa
  • Certifications: UL/CSA and PED Declaration

Technical Parameters

Technical Data | RFKH Series
RefrigerantAftermarket ModelConnection TypeInlet
ØA
Outlet
ØB
Ext. Equalizer
ØC
  
Inlet / Outlet / EqualizerFlare
(inch)
Flare
(inch)
Solder (inch)Flare
(inch)
Solder (inch)
R-22 RFKH 01-6.0-22 flare / flare 3/8 1/2 - - -
RFKH 01E-6.0-13 flare / flare / flare 1/2 - 1/4 -
RFKH 01-6.0-07 flare / solder - 1/2 - -
RFKH 01E-6.0-08 flare / solder / solder - 1/2 - 1/4
R-407C RFKH 02-6.3-24 flare / flare 3/8 1/2 - - -
RFKH 02E-6.3-20 flare / flare / flare 1/2 - 1/4 -
RFKH 02-6.0-07 flare / solder - 1/2 - -
RFKH 02E-6.0-08 flare / solder / solder - 1/2 - 1/4
R-404A
/
R-507
RFKH 03-4.8-21 flare / flare 3/8 1/2 - - -
RFKH 03E-4.8-15 flare / flare / flare 1/2 - 1/4 -
RFKH 03-4.8-09 flare / solder - 1/2 - -
RFKH 03E-4.8-10 flare / solder / solder - 1/2 - 1/4
R-134a RFKH 04-2.9-23 flare / flare 3/8 1/2 - - -
RFKH 04E-2.9-19 flare / flare / flare 1/2 - 1/4 -
RFKH 04-2.9-30 flare / solder - 1/2 - -
RFKH 04E-2.9-31 flare / solder / solder - 1/2 - 1/4
R-410A RFKH 05-7.6-66 flare / flare 3/8 1/2 - - -
RFKH 05E-7.6-33 flare / flare / flare 1/2 - 1/4 -
RFKH 05-27.6-35 flare / solder - 1/2 - -
RFKH 05E-7.6-34 flare / solder / solder - 1/2 - 1/4
               
SOLDER ADAPTERS FOR RFKH INLET A   SOLDER ADAPTERS FOR RFKH EXTERNAL EQUALIZATION
Aftermarket ModelSAE Flare
Ø e
Solder 
Connection Ø d Aftermarket ModelSAE Flare
Ø e
Solder 
Connection Ø d 
RFKH-038-01 3/8” 3/8”   RFKH-038-04 1/4” 1/4”  
RFKH-038-05 1/4"    
Note: 1. Copper tube and flare nut are included   Note: 1. Copper tube and flare nut are included  

Nominal Capacity

No. Nominal Capacity in kW Valve orifice Model Valve orifice Part number
R22 R407C R404A / R507C R134a
0X 0,5 0,5 0,35 0,33 RFKA-023-0X RFK-24036
0 1,1 1,1 0,7 0,68 RFKA-023-00 RFK-24037
1 2,5 2,7 1,7 1,6 RFKA-023-01 RFK-24038
2 3,5 3,9 2,4 2,2 RFKA-023-02 RFK-24039
3 5,6 6,3 3,9 3,5 RFKA-023-03 RFK-24040
4 8,1 8,8 5,6 4,9 RFKA-023-04 RFK-24041
5 10,6 11,3 7,4 6,7 RFKA-023-05 RFK-24042
6 16,9 18,3 12 10,6 RFKA-023-06 RFK-24043

Note?Nominal capacity at t_ev = 5°C, t_c = 38°C, operating superheat 4K and subcooling 4K.

Dimensions

Thermal Expansion Valve RFKA Series . Dimensions

Inlet AOutlet BExternal Equalization C
ThreadThreadSolder ODFThreadSolder ODF
[inch][inch][mm][inch][inch][mm][inch]
3/8 1/2     1/4    
  12     6  
    1/2     1/4

Note: Version with Solder ODF in inch sizes for Outlet B and for External Equalization C on request.