Fixed cone (Howell-Bunger) valves discharge as a hollow expanding jet at roughly 45°, dissipate most of the jet energy in air, and achieve discharge coefficients of about 0.85 fully open…
A changeover valve lets you isolate and service one of two safety relief valves while the other stays online, and ASME BPVC Section VIII (UG-135 and Appendix M) plus the…
A centrifugal pump running at shutoff converts virtually 100% of its absorbed shaft power into heat; a feed pump absorbing 800 kW with 400 litres trapped in the casing heats…
Piston valves seal on two resilient graphite rings compressed around a polished stainless steel piston, giving a sealing contact area roughly ten times that of a globe valve seat and…
An elastomer duckbill check valve seals drip-tight on as little as 25–50 mm of reverse head, whereas a poorly seated metal flap valve can leak litres per second past a…
PVC-U valves carry a PN16 rating only at 20°C; by 40°C the derating curve in EN ISO 15493 has already cut the allowable pressure by roughly 40%, and at 60°C…
Penstock leakage is specified by class, not by feel: DIN 19569-4 Class 4 limits leakage to 0.02 l/s per metre of seal perimeter, while Class 5 is effectively drip-tight –…
BS 1212 splits domestic float valves into four parts: Part 1 Portsmouth-pattern valves are banned from new WC cisterns under the Water Supply (Water Fittings) Regulations 1999, so specify Part…
An API 650 atmospheric tank may be designed for as little as 2.5 kPa (10 in. w.c.) of internal pressure and a fraction of that in vacuum — a correctly…
Flow coefficient, Cv, quantifies how much flow a valve passes at a given pressure drop and specific gravity, providing a standardized basis for comparing sizing capacity across different valve types…
