Valve knowledge
Selection guides for the decisions that come before a model number: body material, end connection, isolation family, non-slam closure and relief execution. Every catalogue figure referenced in these guides is derived from the same evidence-gated data that renders the product pages.
Guide
Valve body materials: cast iron, ductile iron, carbon steel and stainless steel
How valve body material groups differ — grey and ductile iron, WCB and low-alloy steels, CF8/CF8M and SS304/SS316 stainless — and what to state in an inquiry so…
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Valve end connections: flanged RF/RTJ, butt-weld, socket-weld and threaded
Flanged (RF, RTJ), butt-weld, socket-weld and NPT threaded valve ends, wafer vs lug clamping, and why ASME B16.5 and EN/DIN flange drilling are not interchangea…
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Isolation valve selection: gate vs ball vs butterfly vs diaphragm
Four isolation valve families compared for duty: gate for straight-through shut-off, ball for quarter-turn tight closure, butterfly for compact utility service,…
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Check valve selection and water hammer
Swing, dual-plate, tilting-disc, silent and lift check valves: how closing behaviour drives water hammer, what cracking pressure and orientation mean for select…
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Safety valve selection: set pressure, back pressure and execution types
How safety (relief) valves are selected: set pressure and overpressure, superimposed vs built-up back pressure, and the differences between full-lift, low-lift,…
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