Sieve bed retention system

A molecular sieve unit comprising:

• a. a housing sealed at a first end via an inlet end cap having an inlet orifice defined therein and at a second end via an outlet end cap having an outlet orifice defined therein;
• b. a packed sieve bed of adsorptive material disposed within the housing;
• and
• c. a retention system positioned between the packed sieve bed and the outlet end cap, the retention system comprising:
• i. a perforated plate having a top face and bottom face, wherein the perforated plate is positioned atop the packed sieve bed proximate the outlet end cap;
• ii. a skirt coupled to the bottom face of the perforated plate;
• and
• iii. a biasing member configured to engage the outlet end cap and the top face of the perforated plate, wherein the biasing member urges the perforated plate against the packed sieve bed.

A retention system for a molecular sieve unit, the molecular sieve unit including a housing sealed at a first end via an inlet end cap having an inlet orifice defined therein and at a second end via an outlet end cap having an outlet orifice defined therein, the housing configured to retain a packed sieve bed of adsorptive material, the retention system comprising:

• a. a perforated plate having a top face and bottom face, wherein the perforated plate is configured to be positioned atop the packed sieve bed proximate the outlet end cap;
• b. a skirt coupled to the bottom face of the perforated plate, wherein the skirt includes one or more alignment components configured to be interposed between the skirt and an internal wall of the housing;
• c. a biasing member configured to engage the outlet end cap and the top face of the perforated plate, wherein the biasing member urges the perforated plate against the packed sieve bed;
• and
• d. a felt filter and/or mesh screen configured to be interposed between the perforated plate and the packed sieve bed.