Manifolds are a set of several valves mounted on the same block with several connections. They are used to isolate a process pipe to an instrument, equalize pressures, differential pressures, isolate pressure gauges, purge, block or calibrate different lines. Depending on the operations we want them to perform, they can have 1, 2 and 3 ways and 1, 2, 3 or 5 valves.
Manifolds can be for direct mounting when are connected directly to pressure transmitters via a standard flange. Alternatively, only threaded connections for the assembly into the instrument are used if a manifold is remote mount type.
2-valve manifolds are used for single pressure level applications, 3 and 5 valve manifolds are used for differential pressures.