| CPC B41J 11/0085 (2013.01) [F16K 15/1401 (2021.08); F16K 15/16 (2013.01); F16K 51/02 (2013.01)] | 14 Claims | 

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               1. A sheet for an array of vacuum apertures in a substrate support unit of a printer, comprising: 
            a plurality of valves formed into the sheet; 
                wherein the sheet is made from a resilient material; and 
                wherein each valve comprises a valve head for sealing a vacuum aperture in the substrate support unit, and a valve lever arm for permitting movement of the valve head towards and away from the vacuum aperture in order to open and close the valve; and 
                wherein the valve lever arm extends from the sheet at a first side of the valve head around the side of the valve head and is connected to the valve head at a second side opposite the first side. 
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