| 主权项 |
1. An actuator and valve arrangement comprising:
an actuator and valve portion; at least one housing including the valve portion having a first port for receiving a fluid and a second port for delivering a fluid a valve seat disposed between the first and second port, a valve member operable with the valve seat for controlling fluid flow between the inlet and outlet ports; a valve stem operably connected to the valve member, having a longitudinal axis, a first end, second end and second portion, the valve member is attached at the first end and the second portion is attached at the second end; a first component, operably connected to the second portion of the valve stem, for transmitting an operating force to the valve stem to force movement of the valve stem in a first direction; a second component, operably connected to the second portion of the valve stem, for transmitting an operating force to the valve stem to force movement of the valve stem in a second direction; the actuator including a cam gear having a cam portion and a return feature that extend axially from a cam gear surface and is formed about a central through-hole of cam gear, the return feature comprises a return feature surface that is radially offset by a constant value that will follow the eccentric profile of the cam portion relative to the central through hole of the cam gear; and wherein the first component comprises a roller bearing attached to the stem by a bearing shaft having an extended portion, such that the roller bearing bears against the cam portion to force movement of the valve stem in the first direction and the extended portion bears against the return feature surface to force movement of the valve stem in the second direction as the cam gear rotates. |
