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Flow Restrictors

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Flow Restrictors for Oil and Gas

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 metering fluid controlling the speed of actuators, timing applications in setting equipment, or snubbing pressure pulses.

The Lee Company offers both single and multi-orifice restrictors to meet the needs of any application. Multi-orifice configurations may offer increased resistance to contamination and decrease the potential for erosion caused by cavitation. Lee Jets, Bender Jets, and Visco Jets are 100% tested for bi-directional flow with tight tolerances and come with an integral safety screen for added protection against debris and contamination. They are all constructed of stainless steel, capable of high operating pressures, and utilize the Lee expansion pin locking ends for easy installation and retention.

All products from The Lee Company are designed to maximize space savings but with strength far exceeding their size. Manufacturers will discover an exceptionally resilient product that demonstrates outstanding performance in the harsh environments required for downhole wells and subsea equipment.

In addition to the wide range of available catalog options, over half of the products The Lee Company supplies are customized for the unique needs of a specific application. Flow restrictors can be designed in custom envelopes, with unique flow rates or flow tolerances, constructed of special materials, and more.

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 fluid resistance of flow restrictors and other components. Bernoulli’s equation allows you to calculate performance without needing to factor 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 Jet® Single-Orifice Restrictors

Although the Lee Jet® is the simplest restrictor in our product line, it’s also one of the most proven and reliable restrictors ever developed. Standard Lee Jets are available in 53 Lohm ratings, ranging from 800 to 30,000 Lohms, calibrated within tolerance as low as +/- 2%. Lee High Watt and Lee Kilowatt Jets are intended for low Lohm (high flow) applications starting at 90 Lohms. 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 the 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 a smaller passage size 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 specific to the power generation industry.