PRI/Check Valves
Lee PRI®/Chek® Valves combine the function of a reverse flow pressure relief valve in parallel with the function of a check valve with free flow in the forward direction into one easily installed insert. The relief valve function features a rugged Tungsten Carbide ball and a 440C seat for durability and long life. The remaining components are constructed entirely of stainless steel. The valves are available in a range of relief flow cracking pressures for system pressures up to 5000 psi.
The 281 PRI/Chek Valves are available with or without integral safety screen filters. The unscreened version has a maximum restriction of 300 Lohms in the free flow direction and is available in nine different standard relief flow cracking pressures up to 3600 psid. The screened version has a maximum restriction of 550 Lohms in the free flow direction and is available in 15 different standard relief flow cracking pressures up to 5900 psid. The 375 PRI/Chek Valve has a maximum restriction of 220 Lohms in the free flow direction and is available in seven different standard relief flow cracking pressures up to 5400 psid.
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The 281 PRI/Chek Valves are available with or without integral safety screen filters. The unscreened version has a maximum restriction of 300 Lohms in the free flow direction and is available in nine different standard relief flow cracking pressures up to 3600 psid. The screened version has a maximum restriction of 550 Lohms in the free flow direction and is available in 15 different standard relief flow cracking pressures up to 5900 psid. The 375 PRI/Chek Valve has a maximum restriction of 220 Lohms in the free flow direction and is available in seven different standard relief flow cracking pressures up to 5400 psid.
Other Products and Services from Lee Products Ltd
Lee A.F.O.® (Axial Force Only) Plugs
Unlike other plugs in our product family, A.F.O. Plugs are both removable and reusable due to their threaded design, which allows technicians easy access to sealed passageways. In spite of this, the A.F.O. Plug still seals up to 56,000 psi. Each plug features a floating seal that self-aligns, allowing for threaded holes that aren’t concentric with the through-hole. Lastly, the A.F.O. designation means that no radial force is applied during installation, making this component suitable for thinner-walled housings. See Installation Process Specification P1013 (which applies to all A.F.O. Plugs) for more information.
A.F.O. Plugs are made from stainless steel and are available in standard diameters from 0.190 to 0.625 of an inch.
A.F.O. Plugs are made from stainless steel and are available in standard diameters from 0.190 to 0.625 of an inch.
Safety Relief Valves
Safety relief valves are designed to be fast-acting components that protect systems with the potential for sudden pressure spikes. These valves may sit dormant for indeterminate amounts of time before needing to be used, so it’s crucial that they always work as intended. Our safety relief valves are available in low-leak and tight hysteresis configurations. To ensure reliable operation, we 100% test each component for crack, flow point and reseat pressure.
Our safety relief valves are available in 0.187, 0.250, 0.281 and 0.375 inch insert diameters and 0.687 inch threaded configurations. They are constructed entirely of stainless steel and are available screened and unscreened. Built-in damping ensures quiet operation. Cracking pressures ranging from 20 to 5900 psid.
Our safety relief valves are available in 0.187, 0.250, 0.281 and 0.375 inch insert diameters and 0.687 inch threaded configurations. They are constructed entirely of stainless steel and are available screened and unscreened. Built-in damping ensures quiet operation. Cracking pressures ranging from 20 to 5900 psid.
HI-BAR® Inlet Safety Screen, Flareless AS33514E04 to Port AS930-04
Lee HI-BAR Inlet Safety Screens save space and weight by incorporating the inlet screen directly into the boss fitting end rather than the more traditional approach of having the inlet screen installed in the manifold directly below the fitting. This unique design also offers greater flow and dirt holding capacity than a design that completely encapsulates the screen in the fitting. Lee HI-BAR Inlet Safety Screens are machined entirely from 15-5PH stainless steel and are rugged enough to withstand pressure differentials up to 6000 psi without burst or collapse. Each component is 100% proof pressure tested before shipment to ensure reliable performance. These screens are available in -4, -6, -8, and -10 configurations (AS33514 flareless tube to AS930 port fitting ends), which can be installed into a standard boss per AS33649 or equivalent. Eight standard hole sizes ranging from 50 to 500 micron are available.
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.