J. Initial Operational Problems 85. 48-Inch Butterfly Valves. The butterfly control valves (sec. 79) were first placed in operation early in May 1952. With a reservoir head of less than 50 feet it was found to be extremely difficult to operate the valves with the handwheel, and trouble with the motor control relays and torque switch prevented reliable motor operation. Investigation revealed that the operating mechanism had been inadequately designed 2/. (The valves were procured from the R-S Products Corporation under performance-type specifications and their design was not reviewed by the Bureau.) S. Morgan Smith Company, parent company to the R-S Products Corporation, constructed new valves and adequate operating mechanisms (fig. 34), which are scheduled for installation in the fall of 1954. Meanwhile, operation of the valves is according to a scale of partial openings which it is considered will not result in stresses exceeding 30 percent of the ultimate strength of the mechanisms, both valves being operated simultaneously. Figure 33 shows the completed outlet works with both valves of the original installation operating at full opening. Figure 34. --48-inch butterfly control valve with improved operating mechanism, scheduled for installation in the fall of 1954. June 1952 (Compare with fig. 11) FIELD NOTE E1.9898.85 NOTE 48 Butterfly valves, drive yokes and linkages, floor 253-D-304 813314 253-D-298 UNITED STATES DEPARTMENT OF THE INTERIOR SAN LUIS VALLEY PROJECT - COLORADO PLATORO DAM OUTLET WORKS 48 BUTTERFLY VALVES AND AUXILIARIES REVISED INSTALLATION DRAWAL.MS. SUBMITTED |