Difference Between Coventional Piston Valve and Pennant Piston Valve
FEATURES | **PENNANT PISTON VALVE** | **CONVENTIONAL PISTON VALVE**
Manufacturing standard of piston valve | API-602- more stringent standard followed | ANSI 800 standard followed
Flanged connections | Integral flanges available from 15nb | Add on flanges provided for 15 to 40nb size
Multiple pattern option | Angle pattern option available in 15 to 25 nb to ensure lower pressure drop in flow | Only straight pattern option available, higher pressure drop compared to angle patterns
Operating life of rings of piston valve | Rings are tested for 1,00,000 cycles of operation | Rings are tested for 2000 to 8000 cycles of operation only
Weight of piston valve | Considerable safety factor considered while designing resulting higher weight of valve | To cut down cost, little or no safety margins considered while designing of weight, resulting in light
Hand wheels | Cast steel MOC minimizes hand wheel damages | Cast steel moc minimizes hand wheel damages
Bolted design | 4 bolt design helps to exert uniform pressure on the seal rings resulting prolonged operating life | 2 bolt design results in uneven pressure exertion on the rings resulting in increased failure rate