Flow 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. Most notably used in the 1960s to supply oxygen to astronauts on the first moonwalk, it’s since been adapted for use in hundreds of power plants the world over.

Standard Lee Jets are available in 53 Lohm ratings ranging from 800 to 30,000 Lohms, and 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.

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 significant 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.

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.