Parker Instrumentation, High-integrity ball valve range with high-flow option
Posted: 17 November 2004
Parker Instrumentation is adding a 25mm version to its high-performance Hi Pro instrumentation ball valve family. Featuring a novel two-piece construction that reduces potential leak paths to a minimum, and a design optimized for reliability, the new valve is ideal for long-lifecycle applications in offshore environments.
The new high flow rate option extends the application scope for Parker's valve family from instrumentation applications into areas such as isolation on process lines, and vessel draining and venting. The ability to specify the valve with a choice of end connections including integral compression tube fittings also makes it suitable for hydraulic power applications.
The new, fully bidirectional Hi Pro valve is initially available in 316 or duplex steel; further fabrication material options will follow.
The design conforms to ANSI/ASME ratings and features a 4:1 pressure boundary safety factor, to deliver reliable ANSI Class 1500 operation. It meets the firesafe requirements of API 607 and BS6755 Part 2. The valve's body end connector thread is additionally fitted with an environmental seal, protecting it from external corrosion attack.
The valve mechanism works on the floating ball principle, with dynamic response seats and an anti blow-out stem, and offers 100% bubble tight operation. As standard Hi Pro valves are provided with PTFE seats for operation over -54 to +204šC (-65 to +400šF). PEEK seat material can be specified to allow the valve to operate over a wide temperature range from -54 to +232šC / -65 to +450šF.
Hi Pro's seats are designed for inherent cavity relief, assuring complete venting downstream of any process medium trapped within the valve cavity. The ball valve also operates with low 'breakout' (actuation) torque, which has been measured at 34 Nm (25 pounds-feet) at full differential 3,600 PSI / 247 bar pressure.
Designed to link with Parker's computer-controlled design and manufacturing facility, users have considerable flexibility over construction specification to optimize the product for particular applications. This includes the specification of single-ferrule CPI or double-ferrule A-LOK compression fittings, or NPT pipe fittings with male or female threads.
By specifying Hi Pro with integral compression tube fittings, plant and process engineers can eliminate the use of taper thread interfaces and any need for sealants - reducing the risk of system contamination, and additionally saving as much as 75% of installation time.
Posted by Alexander Lindsay, Editor Pipeline Magazine
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