Valve interlock

The valve interlock is installed as an integral part of the valve, with the original valve lever removed and replaced by the Netherlocks interlock with a new sliding lever or hand. Designed to suit all types of lever operated valves (ball, butterfly, and plug valves) they are mounted onto your valves to ensure your operators follow the correct process steps. A valve interlock is a trapped key lock assembly which locks the valve in one or two positions - open andor closed - with one key trapped within the lock assembly and one key free.

A valve interlock is a dual-key assembly to lock safety valves in open and closed positions with one key trapped and other free. The type of interlock system below is designed to mechanically interlock two pressure safety valves having two upstream block valves and two downstream block valves to prevent isolation of both the relief valves at the same time and allow safe isolation of the safety valve for maintenance. It s about controlling the sequence of events, conducting different valve process activities.

Netherlocks valve interlocks can be mounted without any alteration to the host valve the characteristics of the valve remain unchanged.

You should use Netherlocks Valve Interlocks where safe and right-first-time valve operation is required. When you need to lock off your quarter turn manual valves, QL Valve interlocks are a smart choice. To change the valve position (open to close or close to open two keys need to be inserted into the lock assembly, and free key is released only when valve is in open or closed position). Your applications may include pressure relief valves (PSV pig launching and receiving, inert gas systems, pump start up, flare lines, boiler blow-down, out of and decoking). found that include 4products.

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