Abstract: A linear flow system of static or unchanging parameters is provided to dispense a fluid or gas at a constant rate of flow independent of fluctuations in discharge line pressures. The system is composed of at least: a downstream pressure regulating device to maintain an initial constant conduit line pressure P1, a flow regulating device to establish a constant internal and discharge rate of flow by maintaining a constant effective orifice area therethrough, and an upstream pressure regulating device to maintain a second constant conduit line pressure P2. Interposed between the supply source and the downstream pressure regulator responsible for maintaining the initial constant conduit line pressure P1, is an integrally connected series of downstream pressure regulators adapted to synergistically buffer and preserve P1 from fluctuations in supply line pressure.