How it works, Warranty and cautions – Ross Controls 5599_I ENERGYSAVER SERIES W60 User Manual
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How It Works
Solenoid Energized
Solenoid De-energized
Energy Saving Mode
(Solenoid de-energized)
NOTE: The example of “How it Works” is specific to the single
solenoid E
NERGY
S
AVER
®
valve. The double solenoid models
operate similarly, but as a double solenoid type valve. If you
have specific questions about the operation of the double or
single solenoid E
NERGY
S
AVER
®
valves, please contact ROSS (see
contact information below) for more information.
When the solenoid is energized, the E
NERGY
S
AVER
®
valve operates
as a standard valve. Supply pressure is directed from the inlet
port to port 4 extending the cylinder at full pressure and force.
Air in the rod end of the cylinder is exhausted via port 3.
Upon de-energizing the solenoid, the pilot valve starts
to exhaust the pilot signal from the end of the spool.
Momentarily, the spool shifts back to a “normal” de-
energized position directing inlet air to flow to the rod end
of the cylinder (port 2 of the valve) and exhausting the
cap end.
The shuttle now has higher pressure on the opposite side
causing it to shift. Shifting the shuttle closes the connection
from the spool to the pilot exhaust and opens the cavity at
the end of the spool to feedback pressure from port 2.
Meanwhile the cylinder has begun to retract.
Because the actuating end of the spool now has high pressure
applied, the spool starts to shift to the right again closing off the
inlet port. Closing the inlet prohibits the air supply from maintaining
pressure on the rod end of the cylinder and as the cylinder continues
to retract, the pressure drops.
This pressure drop reduces the amount of force available to keep
the spool actuated against the valve return spring. So, the spool
starts to shift back thus allowing an influx of pressure to help retract
the cylinder.
The E
NERGY
S
AVER
®
valve operates as a fixed spring regulator when in
the energy saving mode, maintaining the cylinder return pressure at
approximately 30 psig (2 bar). Retracting and holding the cylinder
with only 2 bar pressure consumes much less air than the standard
method of using full pressure to shift and retract.
APPLICATION WARNING: When inlet pressure is 45 psig (3 bar) or less, the double and single solenoid E
NERGY
S
AVER
®
valves
will pressurize port 2 and exhaust port 4, regardless of applied solenoid signals. This feature, which occurs when inlet pressure
is below 45 psig (3 bar), must be taken into consideration in your application design in order to avoid the potential for personal
injury or property damage.
Printed in the U.S.A. – Rev. 06/09
©
2003, 2009
ROSS CONTROLS
®
. All Rights Reserved.
Form NPS257
WARRANTY and CAUTIONS
Standard ROSS warranty and cautions apply, available upon request or at
www.rosscontrols.com
ROSS EUROPA GmbH
Germany
Fax: 49-6103-74694
ROSS ASIA
®
K.K.
Japan
Fax: 81-427-78-7256
ROSS UK Ltd.
United Kingdom
Fax: 44-121-559-5309
ROSS SOUTH AMERICA Ltda.
Brazil
Fax: 55-11-4335-3888
ROSS CONTROLS
®
INDIA Pvt. Ltd.
India
Fax: 91-44-2625-8730
DIMAFLUID s.a.s.
France
Fax: 33-01-4945-6530
ROSS CONTROLS
(CHINA) Ltd.
China
Fax: 86-21-6915-7960
ROSS CONTROLS
®
U.S.A.
Customer Svs. 1-800-GET-ROSS
Technical Svs. 1-888-TEK-ROSS
www.rosscontrols.com