Ross Controls RIGHT ANGLE - Manual (Page 11)

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Series 27 EEZ-ON ® Valves
A Gradual Start-up for Pneumatic Circuits
AIR PRESSURE TO INLET
When air pressure is first applied to the
inlet, air flow to the piston is restricted by
the adjustable needle in the delay orifice.
Downstream air pressure gradually
builds up at a rate determined by the
setting of the adjustable needle.
VALVE OPENS TO FULL FLOW
When downstream air pressure reaches
approximately 40 to 60 percent of inlet
pressure, the valve element shifts to the
full open position and there is full air flow
to the downstream components. This
condition continues as long as inlet air
pressure is present.
INLET PRESSURE REMOVED
When inlet pressure is removed, the
exhausting downstream air pressure
keeps the inlet poppet open until
the downstream pressure drops by
approximately 90 percent. The remaining
pressure is exhausted via the delay
orifice.
The EEZ-ON ® valve is designed to allow a gradual buildup of
downstream air pressure before opening to full air flow. This gradual
pressure buildup allows cylinders and other work elements to move
slowly and more safely into their normal working positions before
full line pressure is applied. An adjustable restriction within the
EEZ-ON
® valve determines the rate of downstream pressure
buildup, and consequently the time delay for the full opening of
the EEZ-ON
® valve.
For added safety, the EEZ-ON ® valve can be used in conjunction
with the L-O-X ® valve (see preceding pages) to provide a lockout
and exhaust feature. The L-O-X ® valve and EEZ-ON ® valve can even
be used in one combined unit (see L-O-X ® valves with EEZ-ON ®
operation, pages 4 & 13).
FRL
L-O-X ®
Valve
EEZ-ON ®
Valve
Operating
Valve
VALVE OPERATION
1 2
ADJUSTING NEEDLE
1 2
ADJUSTING NEEDLE
1 2
ADJUSTING NEEDLE
1
2
B
A
C
Adjusting Needle
2/2 EEZ-ON ® Valves
Port Valve Model Avg. Dimensions inches (mm) Weight
Size Numbers* Cv A B C lb (kg)
1/4 2781A2007 2.3 3.8 (97) 3.8 (97) 3.0 (77) 1.5 (0.7)
3/8 2781A3007 3.8 3.8 (97) 3.8 (97) 3.0 (77) 1.5 (0.7)
1/2 2781A4017 4.0 3.8 (97) 3.8 (97) 3.0 (77) 1.5 (0.7)
1/2 2781A4007 13.0 4.6 (117) 4.5 (114) 3.0 (77) 2.3 (1.0)
3/4 2781A5007 15.0 4.6 (117) 4.5 (114) 3.0 (77) 2.3 (1.0
1 2781A6017 16.0 4.6 (117) 4.5 (114) 3.0 (77) 2.3 (1.0)
1 2781A6007 24.0 6.6 (168) 7.6 (192) 4.1 (103) 6.0 (2.7)
11/4 2781A7007 29.0 6.6 (168) 7.6 (192) 4.1 (103) 6.0 (2.7)
11/2 2781A8017 29.0 6.6 (168) 7.6 (192) 4.1 (103) 6.0 (2.7)
STANDARD SPECIFICATIONS: For valves on this page.
Ambient/Media Temperature: 40° to 175°F (4° to 80°C).
Flow Media: Filtered air; 5 micron recommended.
Inlet Pressure: 30 to 150 psig (2.1 to 10.3 bar). *Body Paint: Gold.
*Port Threads: NPT standard, BSPP. For BSPP threads, add a
“D” prefix to the model number, e.g. D2781A2007.