Three-Way ER Valves

A three-way valve can have three different types of operation:

Clark Cooper 3 Way Rotary ER Valve
  • The first type of three-way valve is a diverting valve, which has one inlet and two outlets. Flow goes from the single inlet to the selected outlet and can only go to one outlet at a time.
  • The second type is a selecting three-way valve, which has two inlets and one outlet. Depending on whether the valve is activated or not, flow goes from the selected inlet to the single outlet. Flow can only come from one inlet at a time.
  • The third type has a supply port, outlet port, and vent port. When the supply is open and the vent is closed, flow travels from the supply to the outlet. When the supply is closed and the vent is open, flow travels from the outlet to the vent. These are available with the supply normally open or the supply normally closed.

Three-Way ER Valves

Three-Way Valve Characteristics

No differential pressure required to open. All valves operate from zero to maximum pressure listed in table.

Clark Cooper ER Series 3 Way Diagram
Pipe Size (inches) Cv Solenoid Series MOPD* (PSIG) Shipping Weight (lbs) Dimensions (inches)
A NPT A #150 FL A #300 FL B C D
1/2 4.5 400 200 20 3.3 4.3 5.5 12.5 7.0 5.0
800 720 25 14.5
3/4 7.8 400 50 22 3.5 7.0 7.6 12.8 8.5 5.5
800 350 27 14.8
1** 10.5 400 25 29 4.2 7.3 7.8 13.0 9.2 5.5
800 150 38 15.0
*MOPD = Maximum Operating Pressure Differential Weights and dimensions are appoximate.
Maximum Fluid Temperature 550ºF

**Contact us for pipe sizes larger than 1"

Three-Way ER Valves

Solenoid (Coil) Characteristics

Solenoid Coil:
Class H, Continuous Duty
18” long, 18 gage wire leads

Solenoid Enclosure:
Zinc Plated Carbon Steel
NEMA 4 (watertight)
NEMA 7 (explosion-proof)
NEMA 4X optional (Epoxy Coating)
Class 1, Division 1, Groups B, C and D
Operating Temperature code: T2D
Ambient Temperature range: -20° C to +85° C

Conduit Connection:
1/2" NPT

AC voltages suitable with 50 and 60 Hertz

ER Valves have the following certifications:
Clark Cooper ER CRN Clark Cooper ER ETL

Solenoid Series Voltage Amps Inrush* Amps Holding
400 24V AC/DC 18.0 1.0
48V DC 12.0 0.6
120V AC/DC 5.0 0.3
240V AC/DC 4.0 0.1
800 24V AC/DC 27.0 2.0
48V DC 25.0 1.0
120V AC/DC 16.0 0.5
240V AC/DC 8.0 0.2

Three-Way ER Valves


Clark Cooper 3 Way Rotary ER Valve

S - Single Switch - Indicates when valve is in its energized position. Specifications can be found here.

X - Single Switch Explosion Proof - Indicates when valve is in its energized position. Specifications can be found here.

M - Dual Switch - Indicates when valve is in both its energized and de-energized position. Specifications can be found here.

Y - Dual Switch Explosion Proof - Indicates when valve is in both is energized and de-energized position. Specifications can be found here.

L - Locking Manual Override - Mechanically locks the valve in its energized position.

T- Terminal Box - Enclosure with the terminal strip attached to the coil. Customer is responsible for creating cable entry into the enclosure.

H - High Temperature - For valves running fluid hotter than 350°F.

V- Vertical Pipe - Valve is able to be mounted for verticle flow instead of horizontal flow.

--Other Options--

ETL - Solenoid meets the requirements for use in Class I, Division I, Groups B-D hazardous locations. More information about the 400 and 800 Series solenoid ETL listed mark is available here.

OX - Valve is cleaned of all internal contaminants to allow use for oxygen service.

T5 - Valve is tested for Class V leakage per FCI 91-2-2004 with air.

HY - Valve is tested for Class V leakage per FCI 91-2-2004 with Helium. This is typically done for hydrogen service applications.


This list contains the options and features available for the ER series valve. PDF IconDownload ER Series - Model Number Breakdown

* Not all combinations are possible.  Please consult Clark Cooper before ordering.

Three-Way ER Valves

Solenoid Actuated

Solenoid Actuated three-way ER valves will fully actuate between its two positions when power is supplied or lost. This allows these valves to be fully automated.
Solenoid Actuated
Action Actuates immediately when power is supplied, resets immediately on loss of power
Valves ER21 (Direct Operated)

Emergency Trip

Emergency Trip three-way valves are useful in applications requiring fluid to be diverted during an emergency condition. The valve actuates once, or 'trips', and remains in its tripped position until it is manually reset to its normal operating, or 'latched', position.

Trip When Energized
Latch Mechanical
Action Trips immediately when power is supplied
Reset Manual reset when the power is off
Valves ER22 (Direct Operated)

Trip On Loss Of Power
Latch Electromagnetic (power must be supplied)
Action Trips immediately on loss of power
Reset Manual reset when power is on
Valves ER32 (Direct Operated)