| 摘要 |
<p>A linkage for coupling a reciprocal actuator 21 to separate butterfly valves 14, 15, each having an operating lever 28, 29 connected to a spindle pivotable in a housing 11, comprising first and second arms 26, 27 coupled to a pivot at respective first ends, the second ends being respectively pivotably connected to the operating levers, wherein one of the arms includes a spring between its ends permitting relative axial movement of said ends when an axial force transmitted therethrough exceeds a threshold. A bell crank may be coupled to the pivot for attachment to the actuator. The housing preferably has an integral fixed arm 20 on which the actuator is mounted. The actuator may be rotary or linear and can be electric, pneumatic or hydraulic. The linkage may be used with an exhaust brake, an exhaust gas recirculation system or a waste heat recovery system of a vehicle. Using a single actuator to operate parallel valves in two separate ducts ensures an equal degree of throttling in each duct.</p> |
