4
2-WAY
1
2-Way/2 Position Valves
Two-way solenoid valves have one inlet and one outlet,
and are used to permit and shut off fluid flow.
Two Types of Operations Apply
Normally Closed (NC)
Fluid is shut off when the coil is de-energized, flows through
the valve when the coil is energized .
Normally Open (NO)
Fluid flows through the valve when the coil is de-energized,
shuts off when the coil is energized .
Two Types of Constructions Apply
Direct Acting
When the solenoid is energized, the core directly opens the
orifice of a Normally Closed valve or closes the orifice in a
Normally Open valve. The valve will operate at pressures
from 0 psi to its rated maximum. The force needed to open
the valve is proportional to the orifice size and fluid pressure.
As orifice size increases, so does the required force. To open
larger orifices without increasing solenoid size, internal
pilots are used.
Internally Piloted
These valves use line pressure to assist operation.
When the coil is de-energized (on a Normally Closed valve),
the pilot orifice is closed and line pressure is applied to the top
of the piston or diaphragm through the bleed orifice, closing
the valve. When the coil is energized, the core opens the pilot
orifice, relieving pressure from the diaphragm or piston. Line
pressure, alone, opens the valve by lifting the diaphragm or
piston off the main orifice.
See Engineering Section for further details.
Standard and Optional Features
Solenoid valves are supplied, as listed, with either RedHat II
molded epoxy solenoids or RedHat solenoids with metal
enclosures. RedHat II valves are identified by the letter “G” or
“H” in their catalog numbers ; e.g., 8030G016. Many optional
features may be added to your valves; e.g., high-temperature
Class H molded coils, manual operators, and metering devices.
See the Optional Features Section for details.
Index
2-Way/2 Position Valves Flow Diagrams
Normally Closed Valve
De-Energized
Normally Closed Valve
Energized
Normally Open Valve
De-Energized
Normally Open Valve
Energized
Series General Description Pipe Size (NPT) Page
8030
Low Pressure 3/8" - 3/4" 3
8040/8215
Aluminum Body 1/8" - 3" 7
8210
General Service 3/8" - 2 1/2" 11
212
Composite Body 1/2" & 3/4" 17
8221
Slow Closing 3/8" - 2 1/2" 23
8223
High Pressure 1/4" - 3/4" 27
8256
Subminiature 1/8" 29
8260
Plastic Body 1/4" - 3/8" 33
8262/8263 NC
General Service 1/8" - 3/8" 37
8262 NO
General Service 1/8" - 1/4" 41
4
2-WAY
2
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