Vacuum fitting H400 series

threadedbrassstainless steel

■ - Moderato-Pressure Characteristics up to 3000 psi (206 bar) ■ - Varying fixed cracking-pressure spnngs ■ - HAM-LET LET-LOK*. Male & Female N PT. and HTC* Face-Seal Bead Ends. GENERAL The H-400 Sériés is a compact design for instrumentation. H-400 valves are normally closed. When differential pressure between the inlet and outlet is higher than the set pressure of the spring. poppet opens to enable a free passage of flow through the valve. For vacuum applications please select H-400HP sériés. CRACKING PRESSURE The differential pressure between the mlet and outlet, at whtch an initial flow is passing through the valve. RESEALPRESSURE The differential pressure between the outlet and inlet, at which no flow is passing through the valve. BACK PRESSURE The differential pressure between the inlet and outlet pressures. Maximum allowable back pressure is rated to 1000 psi (69 bar) for 1/4, 200 psi (14 bar) for 3/8 to1\ In Systems where puises, pressure shock or pressure surges occur please select the H-400HP Sériés CLEANING & PACKAGING Every H-400 sériés Check valve is cleaned in accordance with Standard Cleaning and Packaging (procedure 8184). Oxygen Clean& Lubricant-FreeCleaning and Packaging, in accordance with Spécial Cleaning and Packaging (procedure 8185). is available as an option. TESTING