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A system for decelerating a linearly displaceable valve undergoing a closing motion is disclosed. The system includes a housing, a first hydraulic fluid chamber provided in said housing, and a slave piston for displacing the valve in response to the supply of hydraulic fluid to the first hydraulic f

A system for decelerating a linearly displaceable valve undergoing a closing motion is disclosed. The system includes a housing, a first hydraulic fluid chamber provided in said housing, and a slave piston for displacing the valve in response to the supply of hydraulic fluid to the first hydraulic fluid chamber. Deceleration of the valve may be accomplished by selectively throttling the release of hydraulic fluid in the first chamber to a second chamber. The hydraulic pressure in the second chamber opposes the closing motion of the valve, thereby slowing it gently for a valve seating event. Progressive throttling is used to maintain nearly constant hydraulic pressure in the second chamber during the seating event. The progressive throttling may be accomplished by selection of an appropriate throttling orifice size and shape, as well as an appropriate throttling profile for the orifice.

대표청구항 ▼

[ What is claimed is:] [1.]1. A system for decelerating a linearly displaceable valve undergoing a closing motion, said system having a housing, a first hydraulic fluid chamber provided in said housing, and means for displacing said valve responsive to the supply of hydraulic fluid to said first hyd

[ What is claimed is:] [1.]1. A system for decelerating a linearly displaceable valve undergoing a closing motion, said system having a housing, a first hydraulic fluid chamber provided in said housing, and means for displacing said valve responsive to the supply of hydraulic fluid to said first hydraulic chamber, wherein said system comprises:a second hydraulic fluid chamber wherein hydraulic pressure in said second hydraulic fluid chamber opposes the valve closing motion as said valve approaches a closed position; andmeans for throttling the flow of hydraulic fluid between said second and first hydraulic fluid chambers in response to a displacement of said throttling means by said valve displacing means,wherein a throttling flow area is progressively reduced as said valve approaches said closed position, andwherein said means for throttling comprises a plunger having an internal passage for providing selective hydraulic communication between said first and second hydraulic fluid chambers.