Rotary valve
AssigneeFisher Controls International LLC
InventorHans D. Baumann
Life of this patent
Estimating the term…
Abstract
A rotary valve provides a casing have an inlet and an outlet and a shaft mounted plug that selectively covers the inlet. A seat ring having an inner seating shoulder that is eccentric relative to the body bore of the inlet is provided. The seat ring can be rotated to accommodate variations in the center of the plug for more accurate seating. The plug can be provided with a secondary plug that selectively covers the outlet and that moves relative to the outlet in response to movement of the shaft. The outlet can include a low noise structure having, in one embodiment, a set of tapered slots that vary the flow cross section along the flow path.
Claims9
A rotary valve comprising:
- a casing having an inlet and an outlet;
- a plug movably located relative to the inlet;
- and
- a seat ring located in the inlet adjacent the movable plug, the seat ring including an outer diameter that engages the casing and an inner seating shoulder constructed and arranged to engage the plug, the inner seating shoulder having a center and the outer diameter having a center, the center of the inner seating shoulder being offset from the center of the outer diameter and the seat ring being constructed and arranged to be rotatable relative to the inlet.
Dependencies are inferred from the claim text.