The Lee Company, Industrial Microhydraulics Group

The IMH Restrictor Check Valve for installation into plastic is, functionally, an orifice in series with a check valve, all in one 5.5mm diameter catridge-style package. The valve features easy press-in installation, and can be installed in either direction, providing forward or reverse flow capabilities. Where screening is necessary, a companion screen is available in four different micron ratings.

Lee Plug® expansion plugs seal fluid passages leak-tight, without the use of O-rings, threads, or sealants. It is simply the most successful method of sealing drilled holes in critical applications. Well over 100 million Lee Plugs have been used on aircraft, missiles, spacecraft, and other sophisticated hydraulic systems that require a permanent leak-tight seal. Learn how the Lee Plug works.

Lee Pressure Relief Valves are specifically designed to be the smallest valves available for safety relief applications. The smallest is only 316" in diameter and just over 12" long, and weighs only 1.5 grams. Seven different types are available, offering a wide range of cracking pressures and flow rates.

Lee Miniature Piloting Solenoid Valves combine space and weight savings with superior performance and reliability in demanding applications such as aerospace hydraulic and fuel systems, oil explorationproduction, car racing, and other challenging high pressure applications. Incorporating innovative design and advanced technology, they have set a new benchmark in space and weight savings and power consumption. The lightest version weighs under 0.14 lbs. (2.3 oz.) and uses only 7.8 watts at 28 Vdc. Each subcomponent and manufacturing process has been optimized to ensure a design with the highest performance, longest life, and highest reliability - all within the smallest envelope possible.

The Lee Company offers a wide selection of field-proven single and multiple orifice precision flow restrictors for a variety of demanding applications, including aerospace hydraulic and fuel systems, oil tools, race cars, and other sophisticated fluid power systems. Design engineers worldwide have found Lee Company flow restrictors to be indispensable when small size, light weight and proven reliability are required.

The Lee Company offers many of it’s precision fluid control products already installed in appropriately sized flared, flareless, or dynamic beam seal unions. Lee also offers an array of higher pressure Restrictors, Valves, and Safety Screens built directly into convenient Ring Locked Adapters, allowing designers to take advantage of the unused space in the adapters to reduce manifold size and weight.

The Lee Company offers two types of pressure snubbing devices, and a mechanical device that records peak pressure.

The Lee Company offers a wide variety of Safety Screens designed to protect critical fluid control components from rogue contamination. These screens are not intended to serve as system filters. Two general types are available, differing in their method of construction and pressure capability: Etched Screens and Machined and Drilled Screens.

IMH Insert Check Valves are threadless, cartridge-style valves designed for simple, low cost installation into manifolds. Since insert check valves can only be installed in one direction, most come in forward and reverse flow versions to provide design flexibility. The valves are available in two styles: axial flow and side exit flow. 558, 855, and 400 Bar models are axial flowing and the 832 models are side exit flowing. The valves are compatible with hydraulic fluids, brake fluids, fuels and oils. Integral safety screen protection is available.

IMH Insert Pressure Relief Valves are threadless, cartridge-style valves designed for simple, low-cost installation into manifolds, in the most compact package available anywhere. A high quality, metal-to-metal seat provides long life and extremely low leakage, as well as compatibility with a wide range of fluids.

IMH Pressure Relief Valves for plastic installation have the same internal design as the Insert Pressure Relief Valves, but feature easy, press-in installation. A high quality, metal to metal seat provides low leakage and highly repeatable cracking pressure as well as compatibility with a wide range of fluids and gases.

IMH Insert Precision Orifices are economical, reliable, highly accurate miniature flow restrictors. They are available in 2.5mm, 5.5mm and 8.0mm body diameters, and in forward and reverse flow versions. All three sizes are available in liquid and gas versions. Integral safety screens are incorporated where the orifice diameter is 0.5mm (.020") or below.

IMH Precision Orifices for plastics are economical, reliable, highly accurate miniature flow restrictors. They are available in a 2.5mm body diameter, and in forward and reverse flow directions for both liquids and gases. These orifices are 100% flow tested to ensure that every orifice is within ± 5% of its nominal flow rate. Tighter tolerances are available as specials.

IMH Insert Restrictor Check Valves are, functionally, an orifice in a series with a check valve, all in one 5.5mm diameter, cartridge-style package. These valves are available in forward and reverse flow directions, and incorporate an integral safety screen in models having an orifice diameter below 0.5mm (0.020").

IMH Insert Flow Control Valves are, functionally, an orifice in parallel with a check valve, all in one compact, cartridge-style package. These valves are available in two diameters; 5.5 mm and 8.0mm. Both sizes are available in forward and reverse flow directions.

IMH Flow Control Valves for installation into plastic are, functionally, an orifice in parallel with a check valve, all in one compact, cartridge-style package. The valve are available in two diameters; 5.5mm and 8.0mm. They feature easy, press-in installation, and can be installed in either direction, providing forward and reverse flow capability. Where screening is necessary, companion screens are available in four different micron ratings.

IMH Check Valves for plastic installation have the same internal design as the insert check valves, but feature easy press-in installation. Some models are available with a ceramic ball as standard.

The Lee Company offers two types of miniature, precision nozzles for hydraulic applications: Atomizing Nozzles and Targeting Nozzles. Both types are constructed entirely of stainless steel and can be installed in any attitude.

Lee Shuttle Valves are miniature, 3 port, hydraulic valves that allow fluid to flow from one of two inlet sources to a common outlet. They are small enough to fit right into the head of an actuator, saving both space and weight. As with all Lee Inserts, they require no O-rings or elastomeric seals. Four types of Lee Shuttle Valves are available, ranging in size from 0.187” to 0.500” in diameter.

The Lee Company manufactures a wide variety of miniature, pre-tested cartridge check valves that offer proven reliability and performance. With almost one million valves successfully in service, some for over 20 years, Lee check valves set the standard for small size, light weight and proven reliability. Four types of miniature check valves are available: