Patent ID: 6067946
Filing Date: 2000-05-30
Classification: F01L,F16K,Y10T

Abstract:
A method for hydraulically actuating a poppet valve between an opened position and a closed position, said method comprising the following steps:(a) providing fluid from a high pressure source of fluid to a cylinder, the cylinder containing a piston slidable therein, the piston operatively engaging the poppet valve;(b) moving of the poppet valve toward the opened position by the piston;(c) stopping the flow of fluid from the high pressure source to the cylinder;(d) flowing of fluid from a low pressure source of fluid into the cylinder through a first check valve, the low pressure source being at a pressure higher than ambient;(e) holding the poppet valve in a position by preventing flow of fluid out of the cylinder;(f) establishing fluid communication from the low pressure source of fluid to the cylinder; and(g) accelerating the poppet valve toward the closed position by a first return spring and a second return spring.