GENERAL

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.

SPECIFICATIONS

External leakage: None with 100-psi internal pressure for 60 seconds, normally closed and normally open ports plugged.

Internal leakage: Tripped condition 80-psi internal pressure. No leakage through normally open port in 30 seconds.

Normally-closed-port leakage: Latched condition 80 psi to normally closed port. No leakage through normally closed port in 60 seconds.

SEISMIC RESPONSE

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.