Sea Limited
METHODOLOGY FOR ANALYSIS OF VALVE DYNAMIC CLOSURE PERFORMANCE

Abstract:

A method for calculating a valve closure time includes performing a computational fluid dynamics model simulation of the valve. The method also includes performing multiple functional performance analysis model simulations of the valve based on the computational fluid dynamics model simulation of the valve to calculate the valve closure time. The functional performance analysis model simulations are based on a numerical solution of a second order differential equation according to an equation of motion given by: (I), where m.sub.L is a mass of translating components, y(t) is a piston displacement at a given time t, F.sub..tau. is a force on the valve due to fluid flow, E.mu. is a friction force, F.sub.D is a hydraulic damping force on the piston, F.sub.D is a spring force, FPPA is a hydraulic piston pressure assist force, F.sub.BPA is a hydraulic bore pressure assist force, and F.sub.G is a force due to gravity.