Patent ID: 6953051

Claim:
A valve plate structure comprising: open/shut means for inhaling and discharging fluid through piston movement, said open/shut means including a suction plate and a discharge plate; and a valve plate including a suction port coupled with the open/shut means for inhaling fluid through piston movement, a discharge port for discharging fluid through piston movement and a groove section having a plurality of continuous grooves provided to each surround at least a majority of the outside of the suction port or the discharge port, said plurality of continuous grooves being located beyond an edge of said suction plate or said discharge plate, wherein in a direction extending away from a center of the suction port or the discharge port of the valve plate, each successive one of the continuous grooves has an increasingly greater width than a width of an adjacent continuous groove disposed immediately inside thereof, whereby vibration and noise in various frequency bands generated from the collision of the suction valve or the discharge valve with the valve plate are reduced.