The valve is opened by
rotating the hex drive (or supplied handle) approximately
180 degrees clockwise. When sufficiently rotated, the valve
will automatically latch and stay open. Sending the
appropriate actuation signal (see actuation options) will
pull the latching spindle and allow rapid gate closure by
internal spring force. The valves are designed to operate in
any orientation , however a downward shutting gate
orientation is preferable.
In the smaller valves, all of the seals including the gate
seals are fluorocarbon. In the larger valves, the gate seals
are PTFE while all other seals are fluorocarbon. All valve
materials are corrosion resistant including aluminum,
stainless steel, brass and bronze.
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The AIR STOP valve
must be in the open position to start the engine on which it
is installed. If the engine has multiple air intake lines,
with multiple AIR STOP valves installed, all of the
valves must be open prior to starting or operating the
engine. If multiple valves are installed on one engine,
ENVACON recommends the use of gate position indictor
switches to ensure all valves are either open or closed in
unison.
AIR STOP valve gate position indicator options:
All shut-off valves have either an indictor pin or opening
handle attached to the hex drive. When the indictor pin or
opening handle points toward the valve bore the valve is in
the Closed position. When the indictor pin or opening handle
points toward the top of the valve (opposite the bore) the
valve is in the Open position.
For applications that require more than one shut-off valve
per engine, ENVACON recommends the use of gate position
indicator switches. Tied into the engine start and/or
control system, the switches are used to ensure all of the
valves are open before starting, and all valves are open
during engine operation.
SAFETY RECOMMENDATIONS:
As a safety device, the AIR STOP valve must be
maintained in good working condition at all times. Weekly
testing of the valve and actuation system is recommended, as
is confirmation of functionality prior to entering a
potentially hazardous work site. It is recommended that the
test be performed with the engine running at idle, so as to
confirm complete engine shutdown after the valve(s) is/are
actuated. If the engine has multiple shut-off valves with
gate position indicator switches; with the engine stopped,
each valve should be closed while the other(s) is/are left
open to confirm individual functionality of the gate
position indicator system. In addition, all personnel
working within the vicinity of the engine must be familiar
with the operation of the AIR STOP valve actuation
system, and with the potential 'inhaled combustible gas'
engine over-speed scenarios that require its use.
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