A pilotoperated directional valve has a 400 gram spool Assum

A pilot-operated directional valve has a 400 gram spool. Assuming a pilot pressure of 4000 kPa, how long will it take to have a 4 mm opening? (Don\'t forget the overlap.) Assume no friction, no flow forces, enough pilot flow, etc.

Solution

Force = pressure x area =4000 kpa x .7854x1.5cm dia x1.5cm dia= 72kg force=m x acceleration=0.4kg of spool x acceleration

acceleratin =72/.4 =180 cm /sec sq Time to travel 5 mm time taken in seconds= 0.5cm/180 =0.0028 seconds