PARKER Hannifin’s Instruments Products Division is set to highlight at the Global Petroleum Show in Calgary, Canada, next month the latest additions to its extensive monoflange and Pro-Bloc ranges of block and bleed valves, including versions that comply with the Class A ultra-low-emission requirements of the international ISO 15848 standard.

Parker will also be showing a new series of flushing rings which employ a novel ‘oversize’ design to maximise flexibility. Its flushing rings are the same diameter as the flanges, eliminating the need for flushing port adapters, and the valves can be supplied screwed or welded directly onto the ring’s external face, reducing installation time and costs.

Parker’s monoflange and Pro-Bloc valves are designed to couple instrumentation to the process lines as closely as possible, and to eliminate any use of threaded components – the valve vents can incorporate single- or two-ferrule compression type tube fittings. By combining all necessary primary and secondary valves on a single one-piece body, which mounts directly onto a process flange without use of additional fittings, both series of products reduce the number of potential leak paths substantially. They also help cut installation time and cost. A wide choice of valve configurations - including single block and bleed, and double block and bleed - provides a very flexible interconnection scheme, enabling plant engineers to match requirements very easily.