| 摘要 |
The disclosure is directed to a sprinkler head for a center pivot irrigation system capable of operation under high or low water pressure. A plurality of sprinkler heads are employed in the system, each of which includes a housing defining a water outlet and constructed to issue a jet of water therefrom. A spray deflector is carried in overlying relation to the outlet by an external frame secured to the housing in a position to intercept the jet of water and deflect it into a predetermined spray pattern. The spray deflector is movable relative to the outlet between a first position protectively covering the outlet and a second position spaced from the outlet to create the spray pattern, the spray deflector being movable from the first position to and maintained in the second position by the jet of water, and returnable to the first position by gravity. The sprinkler head further comprises volume control means taking the form of a resilient washer retained within the housing and having a control opening disposed in alignment with the housing outlet, the resilient washer acting to progressively restrict the flow of water as water pressure increases to effect a constant volume output. The sprinkler head further includes means defining a dead ended space within the housing in which air may be caught to act as a shock absorbing cushion to incoming water.
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