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. The Hytork Actuator Extremely high mechanical strength designed to withstand heavy loads when subjected to external forces like shock or impact. Ideal for use in harsh environments such as Marine or Oil & Gas with long-lasting durability. Lug valves are a great way to make repairs in the field easy. They have threaded inserts at both sides of their body, which means you can install them with no nuts. If one side needs servicing all you need do is detach whichever suits best.