Maintenance
Instructions
MI-104 Revision -
Parker Hannifin Corporation
Instrumentation Valve Division
Jacksonville, Alabama
1
U Series Needle Valve
Table I: Maximum Working Pressure and Temperature
Valve Packing Maximum Pressure and Temperaure Maximum Temperature and Pressure
Grafoil ® 6000 psig at 70 °F 1545 psig at 1200 °F
41.4 MPa at 21 °C 10.7 MPa at 649 °C
PTFE 6000 psig at 70 °F 4280 psig at 450 °F
41.4 MPa at 21 °C 29.5 MPa at 204 °C
Always consult your authorized Parker representative if questions arise. The arrow on the Valve Body indicates the
normal direction of flow.
Table II: Packing Nut
Hex Wrench Sizes and Tightening Requirements
Valve Size Hex Wrench Size PTFE Stem Packing Grafoil ® Stem Packing
U6 3/4 inch 125 in-lbs 10.4 ft-lbs
(14.1 N-m) (37.3 N-m)
U12 15/16 inch 150 in-lbs 33.3 ft-lbs
(16.8 N-m) (44.8 N-m)
U16 1-1/8 inch 50 ft-lbs 50 ft-lbs
(67.8 N-m) (67.8 N-m)
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