EMERSON types EX7-I21,EX8-M21 and EX8-I21 Electrical Control Valves Technical Data

Compatibility *  HCFCs, HFCs, CO 2

Mineral and POE lubricants

MOPD  (maximum operating EX4/EX5/EX6/EX7: 35 bar

pressure differential)  EX8: 30 bar

Max. working pressure, PS  45 bar

Medium temperature range: Liquid inlet temperature

Uniflow version  TS: -50 ... +100°C

Biflow version  TS: -40 ... +80°C

Ambient temperature  -40 ... +55°C

Storage temperature  -40 ... +70°C

CE marking EX4/EX5  not required

EX6/EX7/EX8 required, Cat I, Module A

Salt spray test  non-corrosion stainless steel body

Humidity   5 … 95% R.H.

*) Valves are not released for use with inflammable refrigerants.

Connections  ODF stainless steel fittings

Protection accordance to IP 67 with Alco supplied

IEC 529, DIN 40050  cable connector assembly

Vibration for non-connec- 4 g

ted and fastened valve  (0 .. 1000 Hz, 1 Oktave /min.)

Shock   20g at 11 ms, 80g at 1 ms

Net weight  0.5 kg (EX4), 0.52 kg (EX5), 0.6 kg (EX6),

1.1 kg (EX7), 1.5 kg (EX8)

Full travel time  EX4/EX5/EX6: 1.5 s

EX7: 3.2 s, EX8: 5.2 s

Seat leakage  Positive shut-off better than solenoid valve

External leakage  ≤ 3 g / Jahr

Package and delivery  Single pack,

without electrical connector

EMERSON types EX7-I21,EX8-M21 and EX8-I21 Electrical Control Valves 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

EMERSON types EX7-I21,EX8-M21 and EX8-I21 Electrical Control Valves  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 types EX7-I21,EX8-M21 and EX8-I21 Electrical Control Valves photos