| 主权项 |
1. A center pivot irrigator water purging assembly, the center pivot irrigator comprising a radially extending series of rolling towers and an overhead pipe spanning between said towers, the overhead pipe supporting a multiplicity of sprinkler drop tubes and having a radially outer end, said assembly comprising:
(a) a purge pipe communicating with the overhead pipe's radially outer end, the purge pipe having input and output ends; (b) an adaptor pipe having an input end and a longitudinal output end, the adapter pipe's input end communicating with the purge pipe's output end; (c) a ridged frame fixedly attached to and extending longitudinally from the adaptor pipe; (d) a diaphragm actuator fixedly attached to the ridged frame; (e) a disc and valve stem combination connected operatively to the diaphragm actuator, the rigid frame positioning said actuator and combination for movement of the disc between first and second positions, the disc seating oppositely longitudinally against the adaptor pipe's longitudinal output end while in the first position and being displaced longitudinally away from the first position while in the second position; and (f) a shunt having input and output ends, the shunt's input end communicating with a pipe selected from the group consisting of the sprinkler drop tubes, the overhead pipe, the purge pipe, and the adaptor pipe, the shunt's output end communicating with the diaphragm actuator. |
