# P 311 501 R
3/2 valve with mechanical spring.
Normally closed: pressure in port #1
Normally open: pressure in port #3
Can also be used as 2/2 valve. Unused port to be plugged.
Available in G1/8" and 1/8" NPT.
Lockup Valve
Fail in place lockup valve on instrument signal air failure.
Port sizes: 1/8" and 1/4" (G and NPT).
When the air supply pressure drops below the set point, the valve will shift causing the actuator to fail in place.
Set point: between 3 and 6 bars (44 to 87 psi).
# P 411 701 SR
4/2 valve with mechanical spring.
Available in G1/4" and 1/4" NPT.
