The physical strength, structural stability, and corrosion resistance of bronze, in particular, makes it very suitable for a wide variety of applications in the mainstream of industrial requirements. Bronze in valve manufacture is usually an alloy of copper, tin, lead, and zinc. Actuators designed and built for reliability. Our actuators come with a robust manual override handle that provides a mechanical backup in the event of a power failure. This safety feature allows the user to switch between open and closed positions until systems or power is restored.