Bypass Valves

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.

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 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.