Filter cartridge, and method of retrofitting filter housing

A sealing valve assembly for a removable filter cartridge, the sealing valve assembly comprising:

• a first end configured to removably couple the sealing valve assembly to a filter head;
• an inlet passageway and an outlet passageway that each extend through the sealing valve assembly;
• a second end configured to couple the sealing valve assembly to a filter housing to form the removable filter cartridge such that the inlet passageway directs liquid into an inlet of the filter housing and the outlet passageway directs the liquid discharged from an outlet of the filter housing after passing through the filter housing, the filter housing including an internal volume and a filter configured to filter the liquid passing through the filter housing;
• and
• an inlet sealing valve configured to block the inlet passageway and an outlet sealing valve configured to block the outlet passageway when the sealing valve assembly is uncoupled from the filter head such that the internal volume is sealed while the removable filter cartridge is uncoupled from the filter head,
• wherein the inlet sealing valve is a gas open valve, and the outlet sealing valve is a gas open valve, wherein both the inlet sealing valve and the outlet sealing are configured to be actuated from a closed position to an open position when supplied compressed gas.

A method of retrofitting a filter housing, the filter housing having an internal volume containing a filter configured to filter liquid, the method comprising:

• removing the filter housing from a filter head, which includes uncoupling the filter housing from the filter head;
• coupling a sealing valve assembly to the filter housing to form a removable filter cartridge, which includes coupling a first end of the sealing valve assembly to an open end of the filter housing;
• coupling the removable filter cartridge to the filter head, which includes coupling a second end of the sealing valve assembly to the filter head, wherein the sealing valve assembly includes:
• an inlet passageway that directs liquid from the filter head into an inlet of the filter housing,
• an outlet passageway that directs the liquid discharged from an outlet of the filter housing after passing through the filter to the filter head, and
• an inlet sealing valve configured to block the inlet passageway and an outlet sealing valve configured to block the outlet passageway when the sealing valve assembly is uncoupled from the filter head such that the internal volume is sealed while the removable filter cartridge is uncoupled from the filter head;
• supplying compressed gas to an external gas inlet of the inlet sealing valve to actuate the inlet sealing valve from a closed position that blocks the inlet passageway to an open position that allows the liquid to pass through the inlet passageway, the inlet sealing valve being a gas open valve.