Ross Controls CATEGORY 4 - 5_2 VALVES CROSSMIRROR SERIES 77 - Manual (Page 14)

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PRODUCT DATA SHEET INFORMATION
5/2 CROSSMIRROR ® Series 77
This valve is not designed for use in power press clutch/brake applications.
APPLICATIONS: Pneumatic cylinder applications.
• Two hand control EN574 Type III C
• Pinch point applications • Shearing equipment
• Forming applications • Cutting applications
• Clamping applications
VALVE OPERATION
This Series 77 5/2 C
ross
M
irror ® valve is a control reliable, two hand pressure controlled 4-way
double valve that is controlled by two separate pneumatic signals essentially providing “AND”
gate control for the output ports. Both pilot signals must be provided within approximately 500
milliseconds of each other to actuate the valve.
Proper actuation shifts output pressure to port 4. If the valve is not actuated, not provided
appropriate pneumatic signals within the discordance window or if the valve actuates abnormally,
inlet pressure will only be passed to port 2 - cylinder retracted.
This valve is constructed with precision, stainless steel spools as the main valve elements, and
is designed to offer added safety to the operation of many pneumatically controlled machines.
• Requires two inputs within 500 ms
• Self-contained dynamic monitoring system requires no additional valve monitoring controls
• Senses asynchronous inputs via status indicator switch
• Status indication switch available to be integrated with electrical safety control system where
available
• Applications include small size pneumatic cylinder-operated presses, valve operators,
and safety latches
• Base mounted, stainless steel spool valve construction
• Sistema library data available (consult ROSS or visit the Safety industry page at
www.rosscontrols.com)
EMIII HZ
99035
BG
-PR
UFZER
T
ISO 13849-1:2006 Category 4
PL e applications
Cylinder Return to
Home Position
Normal Operation:
After installation the valve is operated by pressurizing both pilot supply ports (S1 and S2) simultaneously. This causes both main
valve elements to be actuated so that air from inlet port 1 flows to outlet port 4. Air downstream of port 2 is exhausted through port 3.
When the pilot supply ports are de-pressurized, both valve elements are de-actuated, and air then flows from inlet port 1 to outlet
port 2. Air downstream of port 4 is exhausted through port 5.
Safety Function:
If the two main valve elements are not actuated or de-actuated synchronously, within 500ms, the valve defaults so that outlet port
2 receives full inlet pressure, and outlet port 4 is exhausted through port 5. If this abnormal operation is the result of a temporary
circumstance, the valve will be ready to resume normal operation as soon as both pilot signal ports have been de-pressurized and
both main valve elements have returned to their normal ready-to-run position. Applying pressure to both signal ports simultaneously
will resume normal operation.
If the cause of the abnormal operation is still present, the valve will either remain in the default position (pressure on port 2 and
not port 4) or will again go into this position on the next actuation attempt. The source of the abnormality must be investigated
and corrected before further operation.
Pressure Switch:
Valves with model numbers ending in the number 1 have a pressure switch to provide user feedback when movement of the main
valve elements was asynchronous.
Two-Hand Pressure Controlled Pneumatic Double Valve
Control Reliable Energy Isolation