Emerson Electrical Control Valves Series Ex4-5-U21, Ex6-7-I21, Ex8-M21

EMERSON Electrical Control Valves Series EX4-5-U21, EX6-7-I21, EX8-M21 Features
• Multifunction as expansion valve, hot gas bypass,suction gas throttling, head pressure, liquid level actuator etc
• Fully hermetic design (no thread joints between valve body and motor compartment)
• Applicable to all common refrigerants (HCFC,HFC) and for subcritical CO 2 applications
• Stepper motor driven
• Short opening and closing time
• Very fast full stroke time
• High resolution and excellent repeatability
• Positive shut-off function to eliminate use of additional solenoid valve
• Bi-flow versions for heat pump applications
• High linear flow capacity
• Extremely wide capacity range (10 … 100%)
• Continuous modulation of mass flow, no stress (liquid hammering) in the refrigeration circuit
• Direct coupling of motor and valve for high reliability (no gear mechanism)
• Ceramic slide and port for highly accurate flow and minimal wear
• Europe patent No. 0743476, USA patent No. 5735501, Japan patent No. 28225789
• Balanced force design
• Corrosion resistant stainless steel body and stainless steel connections
• PS: 45 bar
• Liquid Inlet Temperature TS:Uniflow: -50 to +100°C, Biflow: -40 to +80°C
EMERSON Electrical Control Valves Series EX4-5-U21, EX6-7-I21, EX8-M21 Selection Chart
Type  Part No.  Flow Pattern  Capacity range   Inlet connection  Outlet connection  Electrical connection
EX4-I21  800 615                                                     3/8" ODF          5/8" ODF
EX4-M21  800 616                                                   10mm ODF      16mm ODF
EX5-U21  800 618                                             5/8" (16mm) ODF   7/8" (22mm) ODF
EX6-I21  800 620                                                       7/8" ODF        1-1/8" ODF
EX6-M21  800 621  Uni-flow                                       22mm ODF    28 mm ODF
EX7-I21  800 624                                                        1-1/8" ODF   1-3/8" ODF
EX7-M21  800 625                   10 ... 100%                  28mm ODF  35mm ODF                 M12 Plug
EX8-M21  800 629                                                       42mm ODF  42mm ODF
EX8-U21  800 630                                              1-3/8" (35mm) ODF  1-3/8" (35mm) ODF
EX8-I21  800 631                                                        1-5/8" ODF    1-5/8" ODF
EX4-U31  800 617                                                5/8" (16mm) ODF  5/8" (16mm) ODF
EX5-U31  800 619  Bi-flow                                   5/8" (16mm) ODF  7/8" (22mm) ODF
EX6-I31  800 622    (Heat Pump)                                1-1/8" ODF     1-1/8" ODF
EX6-M31  800 623                                                        28mm ODF    28mm ODF
EX7-U31  800 626                                             1-3/8" (35mm) ODF  1-3/8" (35mm) ODF
Type  Part No. Temperature Range Length  Connector type to valve  Connectortypetodriverorcontroller  Illustration
EXV-M15  804 663                             1.5 m  
EXV-M30  804 664  -50 … +80°C      3.0 m  M12, 4 pins      Loose wires 
EXV-M60  804 665                             6.0 m
EMERSON Electrical Control Valves Series EX4-5-U21, EX6-7-I21, EX8-M21 as expansion valves
ALCO Selection Tool
For easy and quick selection of Electrical Control Val-
ves an Excel based selection tool can be downloaded
from the Internet at www.emersonclimate.eu, or
use the quick selection tables on the following pages.
The following guideline should be taken into
consideration in order to obtain full advantages of
the control valves:
-  Published capacities are maximum and there
are no reserve capacities
-  Larger size of valve leads to shorter pull down
period and shorter travel time i.e. faster response.
For example, EX7 has maximum 3.2 seconds
travel time. The valve has approximately 1.6
seconds travel time at 50% capacity operation.
Example:
System with R407C having two different operating
conditions:
A) 110 kW capacity at +4°C/+50°C with two stages
compressor at 50% / 100% capacity
B) 137 kW capacity at +4°C/+30°C with two stages
compressor at 50% / 100% capacity
EX6 with 126 kW covers condition A, however is not
sufficient to cover condition B. It is recommended to
select larger valve i. e. EX7 with 337 kW at condition
A and 293 kW at condition B.
Condition A:
Full load ratio = 110 / 337 = 33%
Partial load ratio = (110/2) / 337 = 16%
Condition B:
Full load ratio = 137 / 293  = 47%
Partial load ratio = (137/2) / 293 = 23%
The capacity ratios of system to valve are in all
conditions higher than 10%. It is recommended to
use EX7 rather than EX6.