Smith Flow Control Ltd

United Kingdom

See product on smithflowcontrol.com

QL valve (inter)locks suit all types of lever operated quarter turn valves, including ball, butterfly, and plug valves. Available in single key (QLl) or double key (QL2) versions, locking the valve ineither the open or closed position, or if the QL2 version is specified, the valve can be locked in both the open and closed position. Forming part of a comprehensive range of process interlock safety systems. Available with tailor made concentric mounted bespoke valve attachments. The interlocks can be fitted to the valve during live process without the need to shut-down the

system nor does it compromise the certified pressure envelope of the system. When used with other SFC interlocks, operators are compelled to follow the correct sequence of operation of all valves within the interlock sequence. Externally, the body is permanently marked with the desired plant identifiers or 'tag' numbers. • 316 Stainless steel construction • Linear coded-card key design • Robust construction • Proven reliability in all climates • Single or double key versions The key sequence requires code-bars to be inside the lock body, especially chosen to accept only the correct key, which is specific to the process requirements. When ordering QL interlocks, please provide the details of the valve and your required system operating philosophy. Most offshore installations in the North Sea have been equipped with SFC systems as well as the majority of related onshore processing facilities throughout Europe. Smith Flow Control (SFC) was established in 1985 to provide engineered safety solutions for hazardous operations in the oil & gas and chemical processing industries. SFC introduced the coded-card linear-key concept in a range of modular key-operated interlocks to regulate operator execution of work procedures on any form of host process equipment. Typical applications include every form of valve (including motorised and instrument valves), switches, vessel closures, access guards, pressure and temperature sensing systems and rail/road/sea tanker loading systems. SFC’s solutions in hazardous processes reduce the scope for operator error and ensure safe continuous plant operation. Most offshore installations in the North Sea have been equipped with SFC systems as well as the majority of related onshore processing facilities throughout Europe. By 1990, SFC became the generic term for key interlock safety systems in the international oil & gas industry and our client base now includes most of the major operating companies in all five continents.
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