Fluid system resistance temperature compensation

Claim 1

Temperature compensation means as between fluid restrictors in a fluidic system, comprising said restrictors as laminar flow elements in said system such that flow ratio as between said restrictors remains essentially constant with temperature change applied alike to said restrictors, said system comprising a fluid control loop with one of said restrictors in said loop, and a group of restrictors as means for selectively providing different bleeds to atmosphere from said loop, said group of restrictors being provided in a structure comprising a plate, a group of channel forms in one face of said plate, and a cover plate overlying said channel plate whereby said channel forms become peripherally closed passageways; said passageways comprising a manifold passage as a part of said control loop with a control loop input to said manifold at one end of said manifold and an exit to said control loop at the other end of said manifold, and a graduated series of single flat plane spiral restrictor passages as graduated leaks to atmosphere; each of said spiral restrictor passages having one end individually connected to said manifold and the other end exited to atmosphere from the central point of its spiral, with said spirals of sufficient length and suitable form to establish laminar flow therethrough according to operating flow parameters; and said manifold ends of said passages together forming a central, trunklike stem grouping of parallel passages, with said individual passages flowering laterally from said stem grouping into individual spirals in essentially symmetrical increments of separated placement in said structure.