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The ball head is the component that responds to speed changes of the unit. There are various designs of ball heads, but generally, they consist of two flyweights attached to arms that pivot near the axis of rotation. The arms are attached to a collar on a shaft. As the ball head rotational speed increases, the flyballs move out because of centrifugal force pushing a rod down. The rod, usually termed the speeder rod, acts on the pilot valve to route oil to the main valve and the servomotors. On a Pelton governor, the flyweights are. | MECHANICAL GOVERNORS FOR HYDROELECTRIC UNITS Ml FACILITIES INSTRUCTIONS STANDARDS AND TECHNIQUES VOLUME 2-3 UNITED STATES DEPARTMENT OF THE INTERIOR BUREAU OF RECLAMATION DENVER COLORADO REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188 Public reporting burden for this collection of information is estimated to average 1 hour per response including the time for reviewing instructions searching existing data sources gathering and maintaining the data needed and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information including suggestions for reducing this burden to Washington Headquarters Services Directorate for Information Operations and Reports 1215 Jefferson Davis Highway Suit 1204 Arlington VA 22202-4302 and to the Office of Management and Budget Paperwork Reduction Report 0704-0188 Washington DC 20503. 1. AGENCY USE ONLY Leave Blank 2. REPORT DATE July 2002 3. REPORT TYPE AND DATES COVERED 4. TITLE AND SUBTITLE Mechanical Governors for Hydroelectric Units Facilities Instructions Standards and Techniques 5. FUNDING NUMBERS 6. AUTHOR S William Duncan Jr. and Roger Cline 7. PERFORMING ORGANIZATION NAME S AND ADDRESS ES Bureau of Reclamation Denver Federal Center PO Box 25007 Denver CO 80225-0007 8. PERFORMING ORGANIZATION REPORT NUMBER Volume 2-3 9. SPONSORING MONITORING AGENCY NAME S AND ADDRESS ES 10. SPONSORING MONITORING AGENCY REPORT NUMBER 11. SUPPLEMENTARY NOTES 12a. DISTRIBUTION AVAILABILITY STATEMENT Available from the National Technical Information Service Operations Division 5285 Port Royal Road Springfield Virginia 22161 12b. DISTRIBUTION CODE 13. ABSTRACT Maximum 200 words The Bureau of Reclamation has prepared this document to provide guidelines for the maintenance and adjustment of mechanical governors for hydroelectric units. This document describes the operation of mechanical governors and provides detailed procedures for adjusting and .
