Ross Controls RIGHT ANGLE - Manual (Page 10)

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Series 27 Solenoid Piloted Valves with L-O-X ® Control
Remote Control in a Full Range of Valve Sizes
PILOT DE-ENERGIZED
With the solenoid pilot de-energized
(regardless of the position of the
L-O-X ® handle) the inlet poppet
remains closed. The outlet port is
connected to the exhaust port so that
pressure in the downstream lines is
vented to atmosphere.
PILOT ENERGIZED
With the solenoid pilot energized and
the L-O-X ® control in the open posi-
tion, air can flow from inlet to outlet
port. The exhaust port is closed.
L-O-X ® VALVE CLOSED
With the handle pushed inward, the
L-O-X ® control is closed, and air to
the valve piston is cut off. This allows
the inlet poppet to be closed by its
spring and the pressure of the inlet
air. The outlet is connected to exhaust
so downstream pressure is vented.
Following any FRL components, an energy isolation valve is usually
the first valve in the line supplying compressed air to equipment. The
energy isolation valve should provide a quick means of shutting off the
supply of air and exhausting the downstream lines.
The shut-off function of the solenoid pilot controlled L-O-X ® valve is the
same as that of the manual L-O-X ® valves. A short, full inward push
of the red operating handle closes off the flow of air, and exhausts the
pressure in the downstream line. In addition, the solenoid pilot controlled
allows the air supply to be turned on or off by remote electrical control
whenever the L-O-X ® handle is in the outward position. Air flows only if
the L-O-X ® handle is outward and the solenoid pilot is energized. When
the L-O-X ® handle is pushed in, air will not flow regardless of the pilot
being energized or not. As with all L-O-X ® valves, the L-O-X ® handle
can be padlocked in the closed position. As a further precaution against
inadvertent air flow, the solenoid pilot controlled has no manual override.
Because of the poppet construction of the main valve body, air pressure
provides the forces both to open the valve and to close it. These are
large forces so that quick response is ensured even after the valve has
been on standby for a long time.
VALVE OPERATION
The position of the red handle indicates instantaneous
full flow pressurizing or exhausting capability.
1
2
3
PILOT
VALVE
1
2
3
PILOT
VALVE
1
2
3
PILOT
VALVE
B
C
A
1
2
3 3 3
Y Y
For coordinating silencers,
see page 18 (model numbers
5500A4003, 5500A6003,
5500A8001 and 5500A9002).
Port Size Valve Model Avg. Cv Dimensions inches (mm) Weight
In-Out Exh. Number* 1 to 2 2 to 3 A B C lb (kg)
1/4 1/2 Y2773A2072 2.5 3.1 7.1 (181) 8.4 (212) 6.5 (165) 3.5 (1.6)
3/8 1/2 Y2773A3072 3.6 5.3 7.1 (181) 8.4 (212) 6.5 (165) 3.5 (1.6)
1/2 1/2 Y2773A4082 3.3 5.3 7.1 (181) 8.4 (212) 6.5 (165) 3.5 (1.6)
1/2 1 Y2773A4072 6.3 9.2 7.1 (181) 9.0 (228) 6.9 (175) 4.3 (1.9)
3/4 1 Y2773A5072 7.7 11 7.1 (181) 9.0 (228) 6.9 (175) 4.3 (1.9)
1 1 Y2773A6082 8.0 12 7.1 (181) 9.0 (228) 6.9 (175) 4.3 (1.9)
1 11/2 Y2773A6072 23 34 8.1 (206) 11.8 (299) 6.9 (175) 8.0 (3.6)
11/4 11/2 Y2773A7072 30 32 8.1 (206) 11.8 (299) 6.9 (175) 8.0 (3.6)
11/2 11/2 Y2773A8082 30 31 8.1 (206) 11.8 (299) 6.9 (175) 8.0 (3.6)
11/2 21/2 Y2773A8072 68 70 9.3 (235) 13.8 (352) 7.3 (184) 17.5 (7.9)
2 21/2 Y2773A9072 70 70 9.3 (235) 13.8 (352) 7.3 (184) 17.5 (7.9)
21/2 21/2 Y2773A9082 70 71 9.3 (235) 13.8 (352) 7.3 (184) 17.5 (7.9)
STANDARD SPECIFICATIONS: For valves on this page.
Ambient Temperature: 40° to 120°F (4° to 50°C).
Media Temperature: 40° to 175°F (4° to 80°C).
Flow Media: Filtered air; 5 micron recommended.
Inlet Pressure: Port sizes 1/4 to 1 1/2: 15 to 150 psig (1.0 to 10.3 bar).
Port sizes 1 1/2 to 21/2: 30 to 150 psig (2.1 to 10.3 bar).
*Body Paint: Yellow.
*Port Threads: NPT standard. For BSPP threads, insert a “D” after
“Y” to the model number, e.g. YD2773A2072.
NOTE: Per specifications and regulations, these products are
defined as energy isolation devices, NOT AS EMERGENCY
STOP DEVICES.
L-O-X ® Sensing Port
L-O-X ® Sensing Port - Series 15 manual L-O-X ® valves and manual L-O-X ® valves with EEZ-ON ® operation are now provided with 1/8
NPT sensing ports, enabling installation of a pressure sensing device such as the Pop-Up Indicator or Pressure Switch shown below.
Standards suggest that machine design should include a method for verifying the release of energy after lockout.
The ROSS 988A30 Pop-Up Indicator is constructed for the industrial environment with a brass body and 1/8” NPT connection. It offers
360° visibility and a redundant verification feature. By pushing on the red plunger, the operator can “feel” the presence of pressure
and verify that the indicator is performing its sensing function.
The ROSS 586A86 Pressure Switch offers an electronic pressure sensing option that can be integrated into a safety monitoring system,
which confirms energy isolation throughout the circuit.