Interlocks integrate with all makes and sizes of manually operated valves without modification. With minor modification, they operate with hydraulic or electrical actuators. Interlocks are tamperproof, weatherproof, maintenance-free and require no hot work or drilling for installation. They are manufactured from grade 316L stainless steel to ISO 9001 standards. Available in single- and dual-key configurations for rising and non-rising handwheel and quarter-turn lever-operated valves. The Prosafe MT (multi-turn) series can be anchored to globe or gate valve yokes with fabricated stainless steel straps, giving considerable cost and weight savings and allowing for easy valve maintenance with obstructing access.

Sigma Controls Ltd.