Interlocks

Valve interlock and trapped key solutions preventing hazardous situations under any condition.

Alcatraz integral multi turn (type DML/SML) valve interlocks fit on all types of handwheel operated valves, such as gate, globe and all gear operated valves. The interlocks are easy to install, even when the valve is in a live process. They are mounted on multi turn valves to interlock the locked open and/or locked closed position of the valve. Only if both keys are inserted into the lock portions the valve can be operated. The first key can only be released in the fully open position, the other key can only be released in the fully closed position.

Typical applications include changeover valves (gate or globe), pressure relief valves, loading and unloading of pig traps and sampling devices.