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Flow Restrictors

Flow Restrictors for Other Industries

Ultra-Reliable Flow for Your Unique Applications

Precision flow restrictors from The Lee Company have become an industry standard for manufacturers around the world. Flow restrictors are found in critical applications, including fluid metering, controlling the speed of actuators, or snubbing pressure pulses.

The Lee Company offers both single and multi-orifice restrictors to meet the needs of any application. Multi-orifice configurations provide increased resistance to contamination and decrease the potential for erosion caused by cavitation. All our restrictors are 100% tested, and many of them come with integral safety screen filters for protection against rogue contamination. In addition, Lee Jets, Bender Jets, and Visco Jets are all 100% tested for bi-directional flow with tight tolerance. All restrictors are stainless steel, capable of high operating pressures, and utilize the Lee expansion pin locking ends for easy installation and retention. Over half of the products Lee supplies are designed for the unique needs of a specific application. Flow restrictors can be designed in custom envelopes such as line mount fittings, with unique flow rates or flow tolerances, constructed of special materials, and more.

All products from The Lee Company are designed to be extraordinarily lightweight but with strength far exceeding their size. Manufacturers will discover an exceptionally resilient product that demonstrates outstanding performance in any environment.

For comprehensive information regarding flow restrictors, download our eBook. “An Engineer’s Guide to Selecting a Flow Restrictor.” provides an unbiased look at different configurations, critical performance characteristics, design challenges, trade-offs, and common failure modes to be aware of. Lastly, The Lee Company has developed a simple system of defining the fluid resistance of flow restrictors and other components. Bernoulli’s equation allows you to calculate performance without factoring in coefficients of discharge and dimensional tolerances. It also allows the user to calculate the total effect of multiple restrictions in series or parallel. To learn more, visit the Lohm Laws page under our Engineering Tools section.

Lee Single-Orifice Restrictors

Although this is the simplest restrictor in our product line, it’s also one of the most proven and reliable restrictors ever developed. Most notably used in the 1960s to supply oxygen to astronauts on the first moonwalk, it is now used in thousands of unique applications across a wide range of industries.
Standard precision orifice restrictors are available in a wide range of flow rates, calibrated within tolerance as low as ±2%. High-pressure configurations are available for operating pressures up to 5000 psi.

Lee Bender Jet Multi-Orifice Restrictors

As the name suggests, Lee Bender Jets use multiple offset orifices in series. Each additional restriction causes an increased reduction in flow. This produces an effect that results in an increased minimum passage size for a given Lohm rate. The valve’s components are protected with two integral safety screens for bi-directional flow and are calibrated to a ±5% tolerance in the range of 125 to 9500 Lohms.

Lee Visco Jet® Multi-Orifice Restrictors

The Lee Visco Jet is one of our most unique innovations. It creates a highly complex fluid passage with a series of individual spin chambers and orifices. This provides an increase in flow passage as great as 25 times that of a corresponding (same Lohm rate) single-stage restrictor, with a corresponding reduction in velocity.
Visco technology offers multiple benefits, including increased resistance to contamination and reduced erosion. Its design prevents cavitation and creates a degree of viscosity compensation. Visco Jets are available in flow rates up to 313,000 Lohms in a 0.187 inch diameter cartridge and up to 2.2 million Lohms in a 0.43 inch diameter cartridge. There is no other product available that can provide this level of restriction with such a sizable minimum passage in such a tiny package.

Lee Axial Visco Jet® Multi-Orifice Restrictors

An evolution of the Bender Jet concept, Lee Axial Visco Jets don’t just bend but spin the fluid in alternating directions to create a more tortuous flow path. The result is a larger passage size than Bender Jets for a given Lohm rate but smaller than Visco Jets. Increased resistance to contamination makes multi-orifice restrictors useful in systems that tend to have dirtier fluids, such as lubrication and fuel systems. Lee Axial Visco Jets are available in models ranging from 600 to 11,000 Lohms.

Support & Resources

Support & Resources from a Team that Speaks Your Language

Partner with The Lee Company and get much more than just a supplier of top-quality fluid control products. Our reliable technical support team is available every step of the way to help you find solutions, maximize productivity, and drive efficiency across your operations. Check out these resources tailored to your industry.
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