Liquid dispenser for discharging pharmaceutical liquids, having - a housing (12, 14a), - an outlet opening and - an outlet valve assigned to the outlet opening, wherein the outlet valve comprises: - a valve opening (16; 382) and a valve pin (42; 370), the valve pin (42; 370) closing the valve opening (16; 382) in a closed position of the outlet valve and releasing the valve opening in an open position of the outlet valve, - a valve body (40; 140; 240; 380), which has either the valve pin or the valve opening and which is displaceable partially with respect to the housing (12, 14a) of the liquid dispenser in order to thereby make it possible to transfer the outlet valve between the closed position and the open position, - a pressure chamber, which is arranged upstream of the valve opening (16, 382) and is delimited to one side by a valve plate (44; 386) of the valve body (40; 140; 240; 380), the valve body (40; 140; 240; 380) being displaceable at least in portions by means of the application of pressure at the valve plate (44; 386) by liquid in the pressure chamber, such that the valve pin (42; 370) and the valve opening (16; 382) are thereby displaced against one another, - for the purpose of making it possible for the valve opening or the valve pin to be displaced with respect to the housing (12, 14a), the valve body (40; 140; 240; 380) has an intrinsically deformable configuration and has a fixing region (46, 246) on the outside which is fixed immovably in relation to the housing (12, 14a), characterized in that - at least one portion of the valve plate (44; 144; 244; 386) which is in contact with liquid in the pressure chamber consists of a valve plate material which is a plastic which can be produced using metallocenes as catalysts and the plastic is a cycloolefin copolymer or a combination of a cycloolefin copolymer and a polypropylene. - a housing (12, 14a), - an outlet opening and - an outlet valve assigned to the outlet opening, - a valve opening (16; 382) and a valve pin (42; 370), the valve pin (42; 370) closing the valve opening (16; 382) in a closed position of the outlet valve and releasing the valve opening in an open position of the outlet valve, - a valve body (40; 140; 240; 380), which has either the valve pin or the valve opening and which is displaceable partially with respect to the housing (12, 14a) of the liquid dispenser in order to thereby make it possible to transfer the outlet valve between the closed position and the open position, - a pressure chamber, which is arranged upstream of the valve opening (16, 382) and is delimited to one side by a valve plate (44; 386) of the valve body (40; 140; 240; 380), the valve body (40; 140; 240; 380) being displaceable at least in portions by means of the application of pressure at the valve plate (44; 386) by liquid in the pressure chamber, such that the valve pin (42; 370) and the valve opening (16; 382) are thereby displaced against one another, - for the purpose of making it possible for the valve opening or the valve pin to be displaced with respect to the housing (12, 14a), the valve body (40; 140; 240; 380) has an intrinsically deformable configuration and has a fixing region (46, 246) on the outside which is fixed immovably in relation to the housing (12, 14a), characterized in that - at least one portion of the valve plate (44; 144; 244; 386) which is in contact with liquid in the pressure chamber consists of a valve plate material which is a plastic which can be produced using metallocenes as catalysts and the plastic is a cycloolefin copolymer or a combination of a cycloolefin copolymer and a polypropylene.