Abstract: A valve construction which may be used to control the flow of any desired fluid in any desired valving action and which provides an interchangeable and removable activating means and an interchangeable and removable valve cartridge assembly of the lap spool, packed spool, proportional flow or any other version. The valve comprises a removable and interchangeable activating means, a removable and interchangeable cap assembly, a novel housing adapted to accept a removable and interchangeable valve cartridge assembly of the lap spool, packed spool, proportional flow, or any other version, and a removable and interchangeable valve cartridge assembly of the lap spool, packed spool, proportional flow, or any other version comprised of a plunger and separator means.

Abstract: A valve construction, particularly a three-way, two-position valve which may be used by itself to control fluid flow, or which may be used as a pilot valve to control operation of a larger valve. The valve comprises a cartridge which may be installed within or removed from the bore of a valve body as a unit. The cartridge unit comprises a valve plunger, a plurality of similar glands, and a plurality of similar separators carried by the plunger, with static seals on the glands and dynamic seals between separators, and a spring for urging the plunger to a predetermined position.The cartridge unit is held within a body bore by means of a cartridge nut which is threaded into one end of the bore. The nut has one end bearing against a separator at one end of the cartridge unit and presses a separator at the other end of the unit against a fixed abutment in the bore, so that axial movement of the plunger does not cause separation of the glands and separators.