English (UK)FrançaisDeutschEspañolChinese

High Purity Flow Restrictors and Diffusers

World Class Filtration Solutions

GasPro™ Flow Restrictors

Porvair GasPro™ Flow Restrictors are designed with hundreds of small, interconnected pore passageways which offer significant benefits when compared to single bore restrictive flow orifices. Flow limiting devices are often installed in compressed gas supply lines and gas distribution manifolds to prevent unintentional high gas flow caused by a ruptured gas line, malfunctioning valve or pressure regulator.

Typical applications

  • Gas distribution panels
    Porvair GasPro™ Flow restrictors protect components and offer a possible replacement for needle valves and MFCs in constant pressure and flow applications.
  • Exhaust venting systems
    Flow Restrictors can reduce exhaust system requirements and offer significant cost reduction.
  • Flow splitting, flow balancing, dilution and mixing
    Flow restrictors can be custom made for each gas supply line.
  • Controlled venting
    Controlled venting flow rate during vacuum chamber venting or purging.
  • Pressure snubbers
    For the prevention of pressure surges and pressure shock.
  • Flame arrestors
    Flow restrictors can also be designed to create a barrier to quench a flame and prevent the flame from igniting a combustible gas.

Features and benefits

  • Improved gas safety
    GasPro™ Flow Restrictors limit the maximum flow when handling hazardous gases.
  • Tamper proof flow control
    Flow restrictors are individually calibrated for accurate, repeatable flow with a set pressure. They provide a fixed flow without moving parts or adjustments.
  • Provide laminar flow
    To reduce turbulence in gas lines and for low velocity gas delivery applications.
  • Corrosion resistant
    Porous and hardware fitting materials 316L stainless steel and Hastelloy® C22.
  • Precision welded in a specially designed glove box
    Precision welding of surface mount and flat gasket flow restrictors in a controlled atmosphere glove box system to eliminate oxidation colour.
  • 100% Helium leak tested
    For safety and to insure seal integrity.
  • Ultrasonically cleaned
    In reagent grade IPOH and deionized water flushed for maximum cleanliness.
  • High pressure N2 pulse flush
    With 0.003m filtered and purified Nitrogen to remove particles and prevent shedding.
  • Vacuum dried
    To less than 1ppm moisture content as needed.
  • Laser marked
    With flow details for easy identification.

Individually packaged
In chemically clean, Class 100 nylon inner bag and polypropylene outer bag.


Click here to view our Chinese microelectronics literature.

For cross-reference lists, please contact


Porvair GasPro Microelectronics
Porvair LiquiPro Microelectronics
Porvair GasPro Microelectronics

Get in touch

Find the right industry specialist at Porvair Filtration Group