A pilot valve assembly for use on a pressure regulator, the pilot valve assembly comprising: a manifold with an internal flow network ; and flow controls connected to the internal flow network to permit fluid to flow amongst them, the flow controls comprising: a fixed pressure pilot valve having a fixed differential pressure; a first adjustable pilot valve configured to adjust differential pressure thereacross; and an adjustable restrictor ; characterized in that the internal flow network connects an outlet of the fixed pressure pilot valve to an inlet of the first adjustable pilot valve ; and the pilot valve assembly is modular and the manifold comprises a plurality of blocks separable from one another, each block having part of the internal flow network comprising machined bores that permit flow among the flow controls ; the pilot valve assembly comprising a first terminal at a particular one of the modular blocks to couple the manifold to pressure at a supply side of the pressure regulator and a second and a third terminal at another one of the modular blocks to couple the 20 manifold respectively to the outlet pressure of the pressure regulator and to a control pressure within a chamber of the pressure regulator. a manifold with an internal flow network ; and flow controls connected to the internal flow network to permit fluid to flow amongst them, the flow controls comprising: a fixed pressure pilot valve having a fixed differential pressure; a first adjustable pilot valve configured to adjust differential pressure thereacross; and an adjustable restrictor ; characterized in that the internal flow network connects an outlet of the fixed pressure pilot valve to an inlet of the first adjustable pilot valve ; and the pilot valve assembly is modular and the manifold comprises a plurality of blocks separable from one another, each block having part of the internal flow network comprising machined bores that permit flow among the flow controls ; the pilot valve assembly comprising a first terminal at a particular one of the modular blocks to couple the manifold to pressure at a supply side of the pressure regulator and a second and a third terminal at another one of the modular blocks to couple the 20 manifold respectively to the outlet pressure of the pressure regulator and to a control pressure within a chamber of the pressure regulator. a fixed pressure pilot valve having a fixed differential pressure; a first adjustable pilot valve configured to adjust differential pressure thereacross; and an adjustable restrictor ; characterized in that the internal flow network connects an outlet of the fixed pressure pilot valve to an inlet of the first adjustable pilot valve ; and the pilot valve assembly is modular and the manifold comprises a plurality of blocks separable from one another, each block having part of the internal flow network comprising machined bores that permit flow among the flow controls ; the pilot valve assembly comprising a first terminal at a particular one of the modular blocks to couple the manifold to pressure at a supply side of the pressure regulator and a second and a third terminal at another one of the modular blocks to couple the 20 manifold respectively to the outlet pressure of the pressure regulator and to a control pressure within a chamber of the pressure regulator. <EOS>