2
2
TECHNICAL DATA
1.
Operating Media:
Dry or lubricated air, non-corrosive
and inert gas, or light hydraulic oil.
2.
Air Supply:
116 psi (8 bar) Maximum.
3.
Temperature:
Standard – NBR; -4˚ to 175˚F (-20˚ to 80˚C)
HT – Viton O-rings: -4˚ to 300˚F (-20˚ to 150˚C)
LT – Silicon O-rings: -40˚ to 175˚F (-40˚ to 80˚C)
LX – Silicon O-rings + Low Temp. Grease:
-60˚ to 175˚F (-50˚ to 80˚C)
4.
Lubrication:
Factory lubricated for the life of the
actuator under normal operating conditions.
5.
Construction:
Suitable for indoor and outdoor use.
6.
External Travel Stops:
±4 degree adjustment on 90
degree stroke.
1
GENERAL
This instruction manual contains important information
regarding the installation, operation, and troubleshooting
of the Jamesbury® Valv-Powr VPVL Mod C Value-Line
Double-Opposed Piston Actuators. Please read these
instructions carefully and save them for further reference.
1.1 WARNING
1.
KEEP HANDS AND CLOTHING AWAY FROM THE VALVE PORTS
AND ACTUATOR PINION AT ALL TIMES.
2.
DO NOT ATTEMPT TO DISASSEMBLE INDIVIDUAL SPRING
CARTRIDGES. DISASSEMBLY OF THE CARTRIDGE MAY RESULT IN
SERIOUS PERSONAL INJURY. IF MAINTENANCE OF THE CARTRIDGE
IS NECESSARY, IT MUST BE RETURNED TO METSO AUTOMATION.
3.
SHUT OFF AND BLEED ALL SUPPLY LINES BEFORE INSTALLATION
OR SERVICING. DO NOT REMOVE END CAPS WHILE THE ACTUATOR
IS PRESSURIZED.
4.
BEFORE INSTALLING THE VALVE AND ACTUATOR, BE SURE THAT
THE INDICATOR ON TOP OF THE ACTUATOR CORRECTLY SHOWS
THE VALVE POSITION. FAILURE TO ASSEMBLE THESE PRODUCTS
TO INDICATE THE CORRECT VALVE POSITION COULD RESULT IN
PERSONAL INJURY.
5.
AN ACTUATOR MUST BE SIZED ACCURATELY FOR PROPER
OPERATION. REFER TO INFORMATION ON ACTUATOR OUTPUT
TORQUES IN THIS BULLETIN AND VALVE TORQUE REQUIREMENTS
IN THE APPROPRIATE VALVE BULLETIN.
Double-Acting (Top View)
Figure 1
6.
OPERATING THE ACTUATOR OVER TEMPERATURE LIMITS MAY
DAMAGE INTERNAL AND EXTERNAL COMPONENTS (DISASSEMBLY
OF SPRING RETURN ACTUATORS MAY BE DANGEROUS).
7.
OPERATING OVER PRESSURE LIMITS MAY RESULT IN PREMATURE
FAILURE AS WELL AS DAMAGE TO THE HOUSING.
Air supplied to
Port 2
forces pistons apart and toward end posi-
tions with exhaust air exiting at
Port 4
(a counterclockwise rota-
tion is obtained).
Air supplied to
Port 4
forces pistons toward center with exhaust
air exiting at
Port 2
(a clockwise rotation is obtained).
Spring-Return (Top View) Spring-to-Close
Figure 2
Port 2
Port 2
Port 4
Port 4
Air supplied to
Port 2
forces pistons apart and toward end posi-
tion, compressing springs. Exhaust air exits at
Port 4
(a counter-
clockwise rotation is obtained).
Loss of air pressure allows springs to force pistons toward center
position with exhaust air exiting at
Port 2
(a clockwise rotation is
obtained).
Port 2
Port 2
Port 4
Port 4
