Fill & Drain Valves

Lee Fill and Drain Valves are mechanically-actuated check valves ideal for a variety of applications that require both the filling and draining of a fluid. These valves are built under aerospace quality standard AS9100 to ensure the precise transfer of fluids during various operational phases, including for leakage and proof testing. A variety of material options are available, making this valve compatible with a wide range of fluids. Lee Fill and Drain Valves offer exceptional external leak rates (under 10⁻⁷ sccs of helium at 4000 psid with cap and gasket installed), helping to preserve the integrity of your systems. Unlike traditional valves with integrated actuators that add weight, our design utilizes a separate pilot tool that is used to open the valve prior to launch. This means that valve’s configuration is extremely small – with a weight as low as 38 grams.

We offer two standard system integration options: a traditional aerospace standard threaded boss mount or a tube stub that can be welded on to provide a leak-tight seal. For either selection, the pilot tool can be used to mechanically open the check valve to drain the system. Custom interfaces are also available to meet your unique needs.