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Summary of Contents for Cameron Demco
- Page 1 Document Number: TC003001-01 Revision: Rev 2 DEMCO® Resilient-Seated Butterfly Valve Installation, Operation, and Maintenance Manual...
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Page 2: Table Of Contents
TROUBLESHOOTING ..............................10 CONTACT INFORMATION ............................11 All the information contained in this manual is the exclusive property of Cameron. Any reproduction or use of the calculations, drawings, photographs, procedures or instructions, either expressed or implied, is forbidden without the written permission of Cameron or its authorized agent. -
Page 3: Bill Of Materials
BILL OF MATERIALS Figure 1 - DEMCO 2" through 12" Resilient Seat Butterfly Valve Table 1 - DEMCO 2” through 12” Parts List Item Qty. Description Body Seat Disc Upper Stem Lower Stem Spring Pin Retainer Top O-Ring Stem O-Ring Bearing * 4 required for throttling valves only. - Page 4 Figure 2 - DEMCO 14" through 36" Resilient Seated Butterfly Valve Table 2 - DEMCO 14” through 36” Parts List Item Qty. Description Body Seat Disc Upper Stem Lower Stem Spring Pin Retainer** Stem O-Ring Upper Bearing Lower Bearing * 4 required for throttling valves only.
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Page 5: Scope
They are light weight quarter turn devices with few parts. They are designed for bubble-tight sealing up to rated pressure and are capable of throttling service. They are easily adapted to automatic actuators. The DEMCO Resilient Seated Butterfly Valve is available in flangeless wafer design or single flange tapped lug configuration NAMEPLATE INFORMATION Figure 3 –... -
Page 6: Installation And Operation Instructions
INSTALLATION AND OPERTAION INSTRUCTIONS INSTALLATION DEMCO Resilient Seated Butterfly Valves are bi-directional and will operate in any position. Normally the valve is installed with the upper stem pointing upward (Figure 5). Elevated valves with gear operators and chain wheels should be installed with the upper stem pointing down (Figure 6) so the open-closed indicator is visible from the ground and the chain does not drag on the pipe. -
Page 7: End-Of-Line Service
Steel ASME Class 150 (or MSS SP-44) weld neck flanges are suitable for all sizes. Slip-on, threaded and socket weld – as well as "stub end" type C flanges – are suitable for use with 2" thru 12" DEMCO Resilient Seated Butterfly Valves. -
Page 8: Disc/Pipe Clearance
Table 4 Wafer Body Studs & Hex Nuts Wafer Body Lug Body Valve Bolt Studs & Hex Nuts Bolt Stud Capscrew Size Circle Size Length (in) Length (in) (in) Dia (in) ‘A’ ‘B’ 4.75 5/8-11 5.00 1.50 2-1/2 5.50 5/8-11 5.50 1.50 6.00... -
Page 9: Operation
2" through 12" DEMCO Resilient Seated Butterfly Valves have flats on the upper stem. 14" and larger valves have a single square key. Stem flats or the square key indicate valve position. When they are in line with the flow stream, the valve is open. -
Page 10: Worm Gear Operated
WORM GEAR OPERATED Worm gear operators are recommended for valves larger than 6 inches. Clockwise rotation of the handwheel closes the butterfly valve. Counterclockwise rotation opens the valve. Gear operators are always mounted with the input shaft perpendicular to the pipe axis for handwheel clearance. Each operator has an arrow on the top of the gear, which indicates the "OPEN - CLOSED"... -
Page 11: Contact Information
Replace elastomer seat with compatible material and/or seat damage is Heat or chemical damage to seat correct offending fluid conditions. present. * Contact your Cameron representative for repair manual. CONTACT INFORMATION HEADQUARTERS 3250 Briarpark Drive, Suite 300 Houston, TX 77042...
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