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A sprinkler includes an outer case and a riser mounted for reciprocation within the case. The riser supports a nozzle, an impeller, and a drive linkage connecting the nozzle and the impeller. A diaphragm valve is mounted in outer case beneath the riser and includes a valve member vertically reciproc

A sprinkler includes an outer case and a riser mounted for reciprocation within the case. The riser supports a nozzle, an impeller, and a drive linkage connecting the nozzle and the impeller. A diaphragm valve is mounted in outer case beneath the riser and includes a valve member vertically reciprocable within a valve support housing to engage and disengage a valve seat. The valve seat can reciprocate relative to the valve support housing to reduce mechanical loading.

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We claim: 1. A sprinkler, comprising: an outer case; a riser mounted for reciprocation within the case and including a nozzle, an impeller, and a drive linkage connecting the nozzle and the impeller; and a diaphragm valve mounted in the outer case beneath the riser including a valve member vertical

We claim: 1. A sprinkler, comprising: an outer case; a riser mounted for reciprocation within the case and including a nozzle, an impeller, and a drive linkage connecting the nozzle and the impeller; and a diaphragm valve mounted in the outer case beneath the riser including a valve member vertically reciprocable within a valve support housing to engage and disengage a valve seat that can reciprocate relative to the valve support housing, the valve support housing, valve member and valve seat being removable as unit from an upper end of the outer case upon removal of the riser. 2. The sprinkler of claim 1 and further comprising a filter screen attached to the valve seat. 3. The sprinkler of claim 1 wherein the valve seat is connected to the valve support housing by a retaining ring that slides over plurality of retaining posts that extend from the valve support housing. 4. The sprinkler of claim 3 wherein the retaining ring is connected to the valve seat by a plurality of ribs. 5. The sprinkler of claim 1 wherein the valve seat is formed as part of a support basket and an elastomeric seal member surrounds a lower portion of the support basket. 6. The sprinkler of claim 1 and further comprising a spring mounted inside the valve support housing for biasing the valve member toward a CLOSED position. 7. The sprinkler of claim 1 wherein the valve member is a piston valve member. 8. The sprinkler of claim 1 wherein the diaphragm valve further includes a cap portion and a metering pin extending through the valve member and having an upper end seated in the cap portion. 9. The sprinkler of claim 1 and further comprising a valve actuator component assembly operatively connected to the diaphragm valve. 10. A valve-in-head sprinkler, comprising: an outer case; a riser vertically reciprocable inside the outer case through an opening in an upper end of the outer case; a diaphragm valve mounted in the outer case and including a valve seat that is vertically slidable within a predetermined limited range relative to a valve support housing to reduce mechanical loading on a structure connecting the valve seat to the valve support housing. 11. A sprinkler, comprising: an outer case; a riser mounted for reciprocation within the case and including a nozzle, an impeller, and a drive linkage connecting the nozzle and the impeller; and a diaphragm valve mounted in the outer case beneath the riser including a valve member vertically reciprocable within a valve support housing to engage and disengage a valve seat that can reciprocate relative to the valve support housing, the valve seat being connected to the valve support housing by a retaining ring that slides over plurality of retaining posts that extend from the valve support housing. 12. A valve-in-head sprinkler, comprising: an outer case; a riser vertically reciprocable inside the outer case through an opening in an upper end of the outer case; a nozzle head rotatably mounted at the upper end of the riser; a turbine, a gear reduction and a reversing mechanism mounted in the riser coupled for rotating the nozzle head through an adjustable arc; a valve mounted in the outer case beneath the riser and including a valve seat that is loosely connected to a valve support housing so that the valve seat can vertically reciprocate within a predetermined limited range relative to the support housing in order to reduce mechanical loading on a structure connecting the valve seat to the valve support housing. 13. A valve-in-head sprinkler, comprising: an outer case; a riser mounted for vertical reciprocation within the case; a nozzle rotatably mounted at the upper end of the riser; a drive mechanism within the riser for rotating the nozzle; and a valve mounted in the outer case beneath the riser including a valve seat slidable to reduce mechanical loading on a structure connecting the valve seat to a support portion of the valve.