Fluid transfer device and system

A manifold assembly unit, comprising a filter capsule having a feed port and a permeate port, a pair of valves in fluid communication with the feed port and a pair of valves in fluid communication with the permeate port, wherein each valve has an axial length and independently comprises:

• a body having:
• a first end containing a face designed to be attached to an upstream component, a downstream component or a second manifold assembly unit,
• a second end attached to the filter capsule, and
• a bore extending axially from the first end to the second end;
• a plunger axially movable within said bore between an open position and a closed position, the plunger having a first end and a second end;
• and
• an actuator operatively connected to the plunger such that movement of the actuator causes the plunger to move axially between the open and closed positions without altering the axial length of the valve,
• wherein:
• the valve is in the closed position when the first end of the plunger is in alignment with the face of the body, and
• the first end of the plunger being in alignment with the face of the body forms a steamable surface and a sterile barrier against the environment to a remainder of the interior of the bore, the plunger and the filter capsule.