Flow 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.

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.