High Purity Gas Flow Restrictors

The Mott GSMR Series surface mount flow restrictors support the 1.125” high-flow C-Seal configuration gas systems. These restrictors are assembled and tested in a Class 100 clean room environment, and are mounted between the substrate and another two-port surface mount component.

The Mott VCR® fitting gas flow restrictor provides a compact, long-lasting flow control which can withstand sustained temperatures to 450°C (inert gas) and pressures to 120 psig.  Mott can supply restrictors that withstand pressures up to 1500 psig by request.

As always, custom materials, porosity and hardware configurations are available upon request.

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Literature & Data Sheets

Mott Semiconductor Products Catalog

Mott Filter and Flow Control Products for the Semiconductor Industry Products: High Purity Filters, Diffusers, and Flow Restrictors

High Purity Gas Flow Restrictors

If you are looking for a low-cost option to achieve consistent flow control and resistance to clogging, explore our high purity porous metal flow restrictors.

High Purity Surface Mount Flow Restrictors

The Mott GSMR Series flow restrictors support the 1.125” high-flow C-Seal configuration gas systems.

Product Specs

Operating Conditions

Surface Mount Restrictors

» Maximum Operating Temperature for Inert Gas: 460°C

» Maximum Operating Pressure: 1,200 psig

» Maximum Differential Pressure: 1,200 psid

» Burst Pressure: 20,000 psig

» Std Downstream Flow Rates: From 50 slpm (higher flows available)

» Flow tolerance: +/- 7% of rated flow at rated pressure (+/- 2% available upon request)

VCR Restrictors

» Maximum Operating Temperature for Inert Gas: 460°C

» Maximum Operating Pressure: 1,500 psig

» Maximum Differential Pressure: 1,500 psid

» Burst Pressure: 7,000 psig

» Std Downstream Flow Rates: From 50 slpm (higher flows available)

» Flow tolerance: +/- 7% of rated flow at rated pressure (+/- 2% available upon request)


» Housing: 316L SS

» Filter Medium: 316L SS

» Wetted Hardware Surface Finish: 10 Ra

» Nickel, Hastelloy®, and other materials available contact us

Fittings & Dimensions for Modular Mount Restrictor
Part Description Seal Type Restrictor Size

(Square In.)

Design Type Number of Ports Available Port Location Available
GSMR-20 C-seal 1.125 Spool piece 2-3 Side


GSMR-30 C-seal 1.500 Spool piece 2-3 Side


Fittings & Dimensions for VCR® Fitting Restrictor
Product Family Fitting Size Housing Material Porous Media Internal Surface Finish Length
5140 1/4″ VCR® Stainless Steel 316L SS 10 Ra 1.55″ / 39.4 mm

Our Design Capabilities

In order to design your in-line or surface mount flow restrictor, please provide:

  • The process gas being used
  • Flow rate: sccm
  • Inlet pressure: psig
  • Outlet pressure, if other than atmosphere

Mott in-line and GSMR restrictors are calibrated on the following gases: Argon, Nitrogen, Hydrogen, Oxygen, Helium, and Air.  All other gases are calibrated using viscosity curves.

Relevant Services

Design Expertise – From start to finish, we customize solutions based on your design parameters, specializing in flow restrictors – challenge us!

Fluid Modeling – Our extensive applications have built a library of data to increase the accuracy of our flow models, particularly for flow restrictors, to provide initial performance and feasibility estimates prior to building prototypes.

Extensive Partner Network – If a material is not listed or capability not in-house, we maintain an extensive network of partners for new material procurement, advanced manufacturing capabilities, and validation testing, especially for flow restrictors.

Engineering Support – Utilize our expert project engineers to design the right flow restrictor for your application, ensuring precision and performance.

Mott's Expertise in Flow Restrictors

Flow restrictors are essential components used in various industries to control and regulate the flow rate of gases in a precise and controlled manner. They play a crucial role in maintaining stability and efficiency within systems where maintaining specific flow rates is critical, such as in chemical processes, medical devices, and analytical instruments. Flow restrictors help prevent excessive flow, ensure consistency, and enhance the overall performance and safety of systems.

Mott excels in providing the best flow restrictors due to its unmatched expertise in customizing solutions tailored to meet the specific design parameters and flow requirements of various applications. Their extensive experience in fluid modeling and an extensive partner network ensures that Mott’s flow restrictors are designed with precision and reliability. With the support of Mott’s engineering team, customers can access the right flow restrictor solutions that guarantee optimal performance and efficiency for their unique applications. Mott’s commitment to filtration excellence and precision engineering makes them a trusted choice for high-quality flow restrictors.

FAQs: Flow Restrictors

Q: What are flow restrictors, and what is their purpose in industrial applications?

A: Flow restrictors, also known as flow control devices, are components used to regulate the flow rate of gases or liquids in industrial systems. They play a crucial role in controlling the speed and volume of fluid or gas movement, ensuring that it meets specific process requirements. Flow restrictors are essential for maintaining precise flow rates, preventing pressure fluctuations, and optimizing the performance of various industrial processes.

Q: How do flow restrictors benefit industrial processes?

A: Flow restrictors offer several benefits in industrial applications. They help maintain consistent flow rates, which is critical for processes that require precise control. Flow restrictors also aid in preventing excessive flow or pressure that can damage equipment and affect product quality. Additionally, they can be used to manage the distribution of gases or liquids in complex systems, ensuring efficient operation and minimizing waste.

Q: Why choose Mott for flow restrictors in industrial applications?

A: Mott Corporation stands out as a trusted provider of flow restrictors due to its extensive experience and commitment to excellence. Mott’s flow restrictors are engineered to deliver precise flow control, reliability, and durability in demanding industrial environments. With a focus on customization, Mott can tailor flow restrictors to meet specific design parameters and application requirements, providing optimized solutions for various industries. Their expertise in fluid modeling, extensive partner network, and dedicated engineering support ensure that customers receive high-quality flow restrictors that enhance the efficiency and performance of their processes.

Q: What industries benefit from Mott’s flow restrictors?

A: Mott’s flow restrictors find applications in a wide range of industries, including semiconductor manufacturing, pharmaceuticals, petrochemicals, and more. These industries rely on Mott’s flow restrictors to maintain precise control over fluid and gas flow, ensuring the success of critical processes and product quality. Whether it’s in high-purity gas delivery systems or chemical processing, Mott’s flow restrictors play a vital role in optimizing industrial operations.