The assembly 78 comprises a tubular housing 79 which contains an axially movable cutter 40 for cutting the membrane 6, an actuator for moving the cutter, and means for sterilising the interior of the valve body, and {HEAD ~ the outer face} of {TAIL ~ the membrane} 6 
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The assembly 78 comprises a tubular housing 79 which contains an axially movable cutter 40 for cutting the membrane 6 , an actuator for moving the cutter , and means for sterilising the interior of the valve body , and { HEAD ~ the outer face } of { TAIL ~ the membrane } 6
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