Aircraft fuel, hydraulic, and pneumatic systems require precise control of flow rate and pressure conditions. The Lee Company offers a range of valves with additional functionality for applications when a basic flow restrictor is not enough. In addition to aerospace, flow metering valves are used in numerous defense applications, including missiles, tanks, submarines, and frigates.
Flow metering valves are an interesting category because not all flow metering valves perform the same function.
Lee Restrictor Cheks combine the function of a restrictor in series with a check valve into one miniature package. This provides considerable size and weight savings with no loss in performance. Lee directional flow controls provide metered flow in one direction and free flow in the opposite direction. Dual metering flow controls offer different metered flow rates in each direction.
By contrast, Lee Floserts – while still incredibly small and lightweight – provide a constant flow over a wide range of differential pressures by incorporating both fixed and variable metering orifices.
In short, Lee flow metering valves generally combine the function of two components in a single package, but they can provide functionality that’s greater than the sum of the combined parts. No matter which component you choose, Lee flow metering valves are robust, reliable products offering precise performance in miniature, lightweight envelopes. They are available in a variety of sizes and configurations to meet the specific needs of your application.
The Lee Restrictor Chek® is a miniature 0.187 inch diameter valve that provides metered flow in one direction and no flow in the other direction. These components are functionally equivalent to a check valve in series with a flow restrictor. Combining these two products in a single package equates to significant savings in size, weight, and cost. These components are available standard in metered Lohm rates from 1000 – 10,000 Lohms, with an integral safety screen to protect the orifice.
Lee directional flow controls provide metered flow in one direction and free flow in the opposite direction. Occasionally referred to as one-way restrictors, these components are functionally equivalent to a check valve in parallel with a flow restrictor. They are available in four diameters (ranging from 0.87 to 0.500 of an inch) with metered Lohm rates from 40 up to 20,000 and rated for 3000, 5000 and 8000 psi systems. Again, these flow controls allow manufacturers to achieve multidimensional savings by combining two components into one compact package.
The Lee Company’s dual metering flow control valves are two-way restrictors that allow a designer to specify a different metered flow rate in each direction. These valves are ideal for high-pressure hydraulic applications with system pressures up to 5000 psi. They feature all stainless steel construction for durability and long life and are available in 0.187 and 0.281 inch diameter models. Each Lee Dual Metering Flow Control is 100% tested in both flow directions to ensure reliable, consistent performance.
Because each direction can be specified differently, our dual metering flow controls can achieve a nearly infinite combination of metered flow rates. As such, all of these components are supplied as custom items to meet the specific needs of an application.
For advanced applications, aircraft and defense manufacturers may wish to consider Lee Floserts. This is a pressure compensated flow control – in other words, the flow will remain constant across a wide range of differential pressures. A variable metering orifice automatically adjusts by sensing the flow rate in terms of differential pressure across a fixed orifice. Floserts are available with the Lee locking end for installation in diameters from 0.250 to 0.500 of an inch as well as a 0.687 inch threaded configuration. Also available are metered flow rates from 0.01 GPM up to 5 GPM, as well as high-pressure versions for operating pressures up to 5000 psi.
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 aerospace and defense-specific resources to learn more about what we offer.