Lee Components in Unions
Virtually every 0.187, 0.250, and 0.281 inch diameter Lee insert is offered already installed in appropriately sized flared, flareless, or dynamic beam seal unions. These unions are made of 304 stainless steel (code “J” in military standards) or 6AL-4V Titanium (code “T”). All Lee Unions have a unique hex wrench arrangement to distinguish them from simple unions and permanent external marking to identify the insert.
The configuration of these unions has been carefully chosen to accommodate most of the 0.187, 0.250, and 0.281 inch Lee inserts, and yet maintain both minimum envelope and weight. These units incorporate the high-root radius UNJF threads to minimize stress concentrations with Class 3A tolerances. All fitting-end dimensions are, except for the internal diameters, in general accordance with the appropriate AS4375E4 and E6, AS4395E04 and E06, and AS85720/1-04 and −06 specifications.
Every Lee Union with an insert installed is proof pressure tested; flared and flareless to 6000 psid and dynamic beam seal to 16,000 psid. Maximum working differential pressure is a function of the particular Lee insert specified (refer to the appropriate insert section).
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The configuration of these unions has been carefully chosen to accommodate most of the 0.187, 0.250, and 0.281 inch Lee inserts, and yet maintain both minimum envelope and weight. These units incorporate the high-root radius UNJF threads to minimize stress concentrations with Class 3A tolerances. All fitting-end dimensions are, except for the internal diameters, in general accordance with the appropriate AS4375E4 and E6, AS4395E04 and E06, and AS85720/1-04 and −06 specifications.
Every Lee Union with an insert installed is proof pressure tested; flared and flareless to 6000 psid and dynamic beam seal to 16,000 psid. Maximum working differential pressure is a function of the particular Lee insert specified (refer to the appropriate insert section).
Other Products and Services from Lee Products Ltd
High Flow Check Valves
Our line-up of poppet-style check valves offers extremely high flow capacity for their size in comparison to ball-style valves and includes our Lo-Lohm Cheks, Hi-Q Cheks, and High Pressure Cheks. The High Pressure Chek starts at a micro-miniature 0.125-inch diameter, yet still withstands up to 8000 psi. Meanwhile, the Hi-Q Chek offers the greatest feasible flow capacity for valves of this size. Available in sizes up to 1 inch in diameter in a cartridge configuration, the Hi-Q Chek valve can flow over 57 GPM with only a 100 psid pressure drop. Finally, the 0.250-inch Lo-Lohm Chek offers 3.5 times more flow than an axial flow ball-style check valve of the same diameter.
Lee Bender Jet Multi-Orifice Restrictors
As the name suggests, Lee Bender Jets use multiple offset orifices in series. Each additional restriction causes an increased reduction in flow. This produces an effect that results in an increased minimum passage size for a given Lohm rate. The valve’s components are protected with two integral safety screens for bi-directional flow and are available calibrated to a ±5% tolerance in the range of 125 to 9500 Lohms.
Spring-Biased Shuttle Valves
This valve configuration is typically used to select between the main hydraulic system and the emergency backup that’s biased in the normally closed port. Its non-interflow design means that its three ports are never open simultaneously. These valves can also be used to extend a large unequal area actuator, where reduced actuation force may be permissible in one direction. Lee spring-biased shuttle valves are available in sizes from 0.187 to 0.500 of an inch.
Lee Products Ltd
3 High Street, Chalfont St Peter, Gerrards Cross, Buckinghamshire, SL9 9QE, United Kingdom
Part of The Lee Company, Lee Products are leaders in the development of miniature precision fluid control components, hydraulic components and mechanical components. Products include shuttle valves, safety screens, PRI, directional flow control and restrictors, plugs, checks and piloting solenoid valves, non-inert 2 & 3 way solenoid valves, high speed solenoid valves, variable & fixed displacement pumps, custom manifolds, static mixers and piezo valves.