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Precautions
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Automatic Valve products are general purpose industrial
pneumatic and vacuum devices. They are not them-selves
inherently harmful. However, the control systems in which
they operate must have necessary safe-guards to prevent
injury or damage should failure of system components
occur.
Use Automatic Valve products only with the operating specifications
stated for the product in each catalog section.
Read and be familiar with the precautions listed under the ‘Design”, “Installation”, “Maintenance” and “Trouble-shooting” portions
of this section of the catalog. Provide adequate warnings and information
on system components and in system operating manuals.
Power Presses: Do not use Automatic Valve for power
presses. Automatic Valve does not manufacture the special purpose
dual safety clutch and brake valves required by OSHA Regulation
1910.217, dated November 1, 1975, and ANSI Standard B11.1, Revision
1982, and EN 13736: 1999.
Two Position Valves: Two position 2 and 3-way valves
will have a flow path from the valve’s inlet port to one of the
valve’s outlet ports in either one or both of the two positions.
4-way valves will always have a flow path from the inlet to one
of the outlet ports regardless of its position. If retaining pressurized
air in the system presents a hazard during system operation or
servicing, a separate method must be used to exhaust the trapped
air.
Three Position Valves: Solenoid operated and air piloted three
position 3-way and 4-way valves will move to the center position
if one of the operators is not acutated. Manually operated three
position valves may or may not return to the center position, depending
on the centering operator. When one of the operators is actuated,
a flow path will exist as it does in two position valves. When
the valve is in the center position, the flow path described below
exists.
Closed Center: All ports, including inlet and exhaust
posts, are blocked when the valve is in the center position. If
trapping air in either or both of the valve outlet cylinder ports
presents a hazard during system operation or servicing, a separate
method must be used to exhaust the trapped air or the valve should
not be used.
Caution: Valves with closed centers should
be used with discretion because there is no makeup air. Any leaks
in the valve, cylinder, or system lines and fittings can cause
drifting (move- ment) of the cylinder.
Open Center: When the valve is in the center position, the
inlet port is closed and the cylinder ports are open to exhaust
ports. If this condition is hazardous in either operation or during
servicing, the valve should not be used.
Solenoid Manual Overrides: Some Automatic Valve air
piloted and solenoid operated valves incorporate manual overrides
which, when actuated, shift the valve as if the solenoid or air
pilot were actuated. If acciden-tal or intentional operation of
the manual override could cause a dangerous problem, the valve
should be ordered without a manual override.
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41144
Vincenti Ct 
PROFILE