Interlocks & AccessoriesOpening valves in the incorrect sequence cancause possible hazards to operators, the plant andenvironment whether through the escape ofharmful substances, unintended mixing of chemicals,accidental isolation of pressure relief valvesand similar.Valve interlock systems are designed to ensurethat valves and ancillary equipment canonly be operated in the sequencepre-determined by the systemdesigner. This is achieved withlocking devices that onlyrelease keys when the valve is in a particularposition, usually fully open or closed, and thenFor example we have supplied a combination ofmechanically lock the valve in that position.both two and three port valves and interlocks forOnce released the key can be taken to the nexttanker fill points. A typical application may requirevalve in the sequence.a drain valve to be open to land drain when not inuse and diverted to a spill tank when in use.This simple sequencing by means of the transfer ofkeys is known as “interlocking” and is accepted byPopular additions are extended valve spindlessafety, insurance and standards authorities as theallowing operation of valves in lower bunds/pits asmost reliable and cost effective way of protectingwell as with some systems the option of cabinetvalve sequencing. By working with Safi and ourlocks and visual key cabinets.other valve and interlock partners we can offersolutions tailored to your specific design brief.For mission critical manually operated valves thatmay be difficult to open due to their size, locationor simply impacts of age and use there are severaltools specifically designed to make these actionsnot only quicker but also safer. Examples include aportable drive actuation kit where a valve or bankof valves can be fitted with a special mounting thatcan be triggered by a single portable pneumatic,electric or battery operated tool. Another solutionto this problem is provided by the pneumaticallyoperated power wrench which uses a simple driveplate attached with U-bolts.20Process Engineering Supplies
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