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Pietro Fiorentini direct-operated gas pressure regulators engineered for high-pressure transmission systems and medium pressure natural gas distribution networks. Diaphragm-controlled, classified Fail Open per EN 334. Hydrogen Ready versions available across the range — Dival 160 AP, Staflux 185, Staflux 187, and Staflux Mini.
Up to 250 bar
Up to 250 bar
0.85 – 75 bar
-20°C to +60°C
Dival 160 AP, Staflux 185, Staflux 187, Staflux Mini
Direct Operated — Diaphragm Controlled
Fail Open (EN 334)
DN 1", 2", 3" (model dependent)
Up to 250 bar (Staflux 187)
1.4 – 250 bar (model dependent)
0.85 – 75 bar (model dependent)
-20°C to +60°C
AC up to 5
SG up to 10
ASME B16.5 Class 300, 600, 1500 RF / RTJ
EN 334
Direct Operated
Diaphragm-controlled with contrasting regulated spring action — simple, reliable, low maintenance.
Fail Open
Classified Fail Open per European Standard EN 334 for safe operation in transmission and distribution networks.
High Pressure Range
Staflux 187 handles inlet pressures up to 250 bar with Class 1500 RF/RTJ flanged connections.
Wide Size Range
Available in DN 1", 2", and 3" depending on model — covering a broad range of flow capacities.
Hydrogen Ready
Dival 160 AP and Staflux 187 are Hydrogen Ready for NG-H2 blending service.
100% H2 Option
Staflux 187 has a dedicated 100% hydrogen version for pure hydrogen pipeline applications.
Anti-Freeze Design
ATF 15 uses main gas flow to warm the laminating seat, preventing freezing during pressure reduction.
Biomethane Compatible
Available in specific versions compatible with biomethane and renewable gas service.
Slam Shut Option
Slam shut safety device configuration available on Dival 160 AP and Staflux 185.
Spring Set Point Adjustment
Set point adjustment via a setting nut — loading and unloading the spring in the top chamber.
Pietro Fiorentini Quality
Engineered and manufactured by Pietro Fiorentini — operating in over 100 countries since 1940.
Up to 250 bar
Max Design Pressure
EN 334
Design Standard
Fail Open
Safety Classification
H2 Ready
Hydrogen Compatible
4 Models
Product Range