Model 400 Seismic Three-Way Valve is designed to
actuate during strong earthquake shaking. When you receive
the Model 400, it will be in its actuated position. When the
Model 400 is actuated, a red bar is visible through the window
in the position indicator located on top of the valve just
above the clamp band.
Model 400 must be manually reset. Using a
screwdriver or wrench, apply light force to rotate the reset
shaft counterclockwise until the green bar is visible through
the window. Release pressure on the screwdriver or wrench,
and the reset shaft will return to its original position.
The green bar will remain visible through the window. Model
400 Seismic Three-Way Valve will now be in its normal operating position,
and the acceleration trigger mechanism will be set to respond
to seismic disturbances.
Caution: Resetting a Model 400 requires only light force; excessive force can damage it.
Warning: For use with dry air or nitrogen gas
only--no plant air.
External leakage: None with 100-psi internal
pressure for 60 seconds, normally closed and normally open
Internal leakage: Tripped condition 80-psi
internal pressure. No leakage through normally open port in
Normally-closed-port leakage: Latched condition
80 psi to normally closed port. No leakage through normally
closed port in 60 seconds.
With the Model 400 Seismic Three-Way Valve latched
and 80 psi supplied to normally closed port, apply 2.5-CPS
sine-wave displacement. The device shall trip between 0.15
and 0.30 G, opening the normally closed port and closing the
normally open port. The test set-up shall prevent internal
pressure from exceeding 80 psi.