INSTALLATION
Pneumatic equipment should be installed only by personstrained and experienced in the installation of such equip-ment. Operating Pressures and Temperatures: Maximum andminimum operating pressures and temperatures are speci-
fied for each type of
valve. Staying within these limits con-tributes to longer
valve life and proper operation. If you mustexceed these limits, consult ROSS for advice on such ser-
vice. Air lines: Before installing a
valve in an existing system,the air lines must be blown clean of all contaminants whichmay be in the system. It is recommended that a 5-micronair filter be installed in the inlet line close to the
valve. Pilot Pressure: For proper operation, pilot pressure mustnot fall below the minimum specified for the
valve. For pop-
pet
valves, pilot pressure must be at least equal to the mainsupply pressure.If a solenoid piloted
valve must operate at a pressure lowerthan the minimum specified pilot pressure, an external pilotsupply of adequate pressure must be used. Some ROSSvalves automatically accept an external pilot supply, while
others must be converted to such use as explained on page11. Valve Inlet: DO NOT RESTRICT AIR SUPPLY. Any re-striction of the air supply lines (for example, sharp bends orclogged filter element) will reduce the speed with which the
outlet volume is pressurized, and can also cause the valveto malfunction. Valve Outlet(s): For faster pressurizing and exhausting ofthe outlet volume, locate the
valve as close as possible tothe mechanism being operated. Also, any restriction in theoutlet lines (for example, sharp bends or undersize lines)
will reduce both pressurizing and exhausting speeds. Vacuum or Non-Air Service: Many ROSS
valves can beused for vacuum service or with fluids other than air. Suchapplications require an external pilot supply. For more infor-mation, consult ROSS for Bulletin 440 (“ROSS Valves for
Vacuum Service”). Valve Exhaust(s): DO NOT RESTRICT EXHAUST OFPOPPET VALVES as this can cause the
valve to malfunc-
tion. To reduce exhaust noise, use a silencer such as theROSS Muffl-Air Pipe Installation: To install pipe in
valve ports, engage pipeone turn, apply pipe thread sealant (tape not recommended),
and tighten pipe. This procedure will prevent sealant fromentering and contaminating the
valve.(Note that the
valve does not itself require air line lubrica-tion.) See below for information about lubricants that are
compatible with the materials used in the
valve and are suit-able for use in compressed air systems.
® . Electrical Conduit Port: It is important that the electricalsupply be of the correct voltage and Hertz. ROSS sole-noids are rated for continuous duty at 85% to 110% of thevoltage shown on the solenoid coil. Multi-rated solenoids
(e.g., 110-120 volts) are rated for continuous duty at 85% to110% of the Compatible Lubricants. Although most ROSS
valves donot require air line lubrication, they may be used with lubri-cated air being supplied to other mechanisms. Some oilscontain additives that can harm seals or other
valve compo-
nents and so cause the
valve to malfunction. The best oilsto use are those specifically compounded for air line ser-vice. These are generally petroleum base oils with oxida-
tion inhibitors, an aniline point between 180°F (82°C) and220°F (104°C), and an ISO 32 or lighter viscosity. See charton next page. maximum voltage shown. A supply voltage thatdoes not fall within this range can lead to faulty
valve action
or solenoid burnout. If electrical power is supplied by a sepa-rate transformer, it must be capable of handling the inrush
current of the solenoids without significant voltage drop.
MAINTENANCE
Pneumatic equipment should be maintained only by per-sons trained and experienced in the maintenance of suchequipment. Supply Clean Air. Foreign material lodging in
valves is amajor cause of improper operation. The use of a 5-micron-rated air filter located close to the
valve is strongly recom-
mended. The filter bowl should be drained regularly, and ifits location makes draining difficult, the filter should beequipped with an automatic drain. Check Lubricator Supply Rate. A lubricator should put afine oil mist into the air line in direct proportion to the rate ofair flow. Excessive lubrication can cause puddling in the
valve
and lead to malfunctions. For most applications an oil flowrate in the lubricator of one drop per minute is adequate. 4 ROSSROSSROSSROSSROSS CONTROLS
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