Our policy is one of continued research and development. We therefore reserve the right to amend,
without notice, the specifications given in this document. © 2015 Norgren, Inc.
Simplified Valve Circuit Guide
4
Three-way valve applied to a cooling air supply
Three-way valves can be used as a remote air pilot for larger valves.
Panel mounted 3-way control valve
Power Valve
2 OUT
3 EX
1 IN
2 OUT
3 EX
COOLING AIR
1 IN
N.O. 3-way Actuated
(Cooling air held off)
Note: A normally open 2-way poppet valve
can also be used in place of the normally open
3-way above.
N.O. 3-way unactuated
(Upon loss of pilot signal,
valve supplies cooling air .)
1 IN
2 OUT
3 EX
IN
EX
CYL. 1
CYL. 2
Four-way Valves
Four-way valves use two 3-way valve functions operated at the same time, one normally closed and
one normally open. These valves have two outlet ports that alternate between being pressurized and
exhausted. Four-way valves are used to operate double acting air cylinders, control bi-directional air
motors and in air circuitry. Also two single acting cylinders can be operated with one 4-way valve.
Poppet Valves, 4-way, 4-port
The flow paths for an unactuated valve are inlet to cylinder 2 and cylinder 1 to exhaust. When actuated,
the inlet is connected to cylinder 1 and cylinder 2 is connected to exhaust. Four-way poppet valves
have one exhaust port which is shared by all cylinder ports.
EX CYL. 1
CYL. 2
IN
