| 摘要 |
A thermally actuated power element comprising an actuator having a guide, defining a generally cylindrical bore extending between first and second guide ends. The guide first end has a generally convex valve member projecting radially between the bore and a valve member periphery, defining a plurality of substantially identical flow depressions. The flow depressions are configured radially intermediate the cylindrical bore and the periphery, while an annular valve member seal surface extends between a radial boundary of the flow depressions and the periphery. A piston having axially opposed first and second piston ends is partially received in the generally cylindrical cavity. A generally concave cup defines a cavity and contains a thermally active pellet, and a diaphragm is received in the guide second end intermediate the cup and said piston. A generally cylindrical return member engages the guide adjacent the periphery. |
