Flow Restrictors

Insert style precision orifices are economical, reliable, highly accurate miniature flow restrictors designed for metal housings. Installation is simple using our field-proven controlled expansion principle, which provides retention and a leak-tight seal without threads, O-rings, or adhesive.

Our standard precision orifices are available in 2.5 mm, 5.5 mm, and 8.0 mm body diameters, and in forward and reverse flow directions. All three sizes are available in liquid and gas configurations with a wide range of standard Lohm rates. Integral safety screens are incorporated where the orifice diameter is 0.5 mm (0.020 of an inch) or below. All orifices are 100% flow tested to ensure that every part is within ± 5% of its nominal flow rate. Tighter flow tolerances are available as specials.

Improve hydraulic performance with Air Bleed Orifices from The Lee Company. These components are used to remove trapped air from hydraulic systems, increase system responsiveness, and improve reaction times. While traditional air bleed methods involve drilling a hole in the hydraulic manifold to allow the trapped air to escape back to the sump, this method also results in a continuous and significant hydraulic fluid loss. Instead, our components utilize a small precision flow orifice that allows trapped air to escape but is small enough to restrict most hydraulic flow, minimizing system losses. Our 5.5 mm diameter Air Bleed Orifices are offered in forward and reverse flow directions, contain an integral locking end for secure retention, and seal without threads, O-rings, or sealants. Both models contain integral safety screens for contamination protection.