Valve Interlocking
Valve interlocking enforces and guarantees a pre-defined sequence of operation, and therefore eliminate human error. They are used as an industry standard by renowned companies to create a safer working environment.
They are used in many applications where safe and ‘first time right’ valve operation is required, such as pressure relief valves (PSV), pig launching and receiving, inert gas systems, pump start up, flare lines, boiler blow-down, ‘2 out of 3‘ and decoking.
SOFIS – VALVE INTERLOCKING
Our manufacturing partner, SOFIS, manufactures valve operation systems such as mechanical valve interlocks, portable actuators and valve position indicators. It is the world’s largest interlock manufacturer, providing bespoke design solutions that protect people and property throughout the world.
Teksal Safety is the Australian and New Zealand distributor for SOFIS Smith Interlocks (formerly Smith Flow Control) and SOFIS Netherlocks valve interlocking and process safety systems, and supports Sofis’ complete range, including supply, installation, commissioning and training services.
Valve Interlocking FAQs
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What is an Interlock?
An interlock is a trapped key mechanical device that prevents undesired states in a process plant through sequence of operation.
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How does an interlock work?
Interlocks are designed to release keys when a predetermined condition has been met. The most common condition is valve fully opened or fully closed. Typically, interlocks are dual key, and the standard is when the valve is fully opened the right key is released and when the valve is fully closed the left key is released. The keys are linear coded, and the interlocks are built with bespoke code bars in them. These codes bars will only allow the designated key to enter the interlock.
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Why should I use Interlocks?
Interlocks take the ‘human error factor’ out of following written work procedures when changing the state of the plant through valve operation.
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Can interlocks fit on any valve type?
Yes. Interlocks are customised to suit each valve type. Interlocks have four main types: GLM and GLS for Multiple Turn Valves, gear box, gate, and globe valves. QLR and QLT for quarter turn ball, plug and butterfly valves.
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Is routine servicing required for interlocks?
Typically, no. Once the interlock is installed and set correctly there are no problems for many years. However there are few instances in which the key may become trapped or difficult to release. These are usually quite simple to overcome by resetting the interlocks fully closed or fully opened positions again.
Want to know more about our valve interlocking solutions?
For more information about our valve interlocking products or any of our industrial safety solutions, call 1300 TEKSAL or email sales@teksal.com.au.
