119 Function Fittings 01 // Fittings Level 3 reduit / EN_Level 4 sans numero Non-Return Valves Adjustable Non-Return Valves Component Materials Technical Characteristics These nickel-plated brass adjustable non-return valves allow compressed air to flow in one direction and prevent flow in the other. They incorporate precise adjustment of opening pressure in the return diretion. Regulations • RoHS • FDA : 21CFR • REACH Advantages • Adjustment and locking of the non-return valve cracking pressure with two 2 Allen keys prevents the settings from being accidentally changed • Designed with locking nut to protect initial setting in the event of vibration or accidental handling • Developed for the food process industry (FDA compliance) and smooth external profile to facilitate cleaning in situ • Compatible Fluids: compressed air • Working Pressure: 0 to 12 bar • Working Temperature: -20°C to +80°C Cracking Pressure Threads 0 to 4 turns (values given as an example only) M5x0.8 - G1/8 - G1/4 1 to 0.10 bar G3/8 1 to 0.15 bar G1/2 1 to 0.20 bar Adjustment nut: brass Body: FDA chemical nickel-plated brass Spring: stainless steel Seat seals: NBR Non-return valve: chemical nickelplated brass locking nut: brass Seals: FKM Adaptor: FDA chemical nickelplated brass Silicone-free Max. Tightening Torques Threads M5 x0.8 G1/8 G1/4 G3/8 G1/2 daN.m 0.16 0.8 1.2 3 3.5 External Components Unscrew the locking nut with an Allen key. Unscrew the adjustment nut with a smaller Allen key to adjust the cracking pressure. The number of turns adjusts the cracking pressure from 1 bar to 0.10 bar. Tighten the locking nut with the Allen key to lock the cracking pressure setting. Then, control the pressure with a pressure gauge downstream. Step 1 Step 2 Step 3 Operation 7930 Adjustable Check Valve, Double Female BSPP and Metric Thread FDA chemical Nickel-plated brass, FKM C EE1FF1F2L Kg M5x0.8 7930 19 19 8.0 4.0 13.0 4.0 6.0 49.0 0.055 G1/8 7930 10 10 8.0 6.0 13.0 4.0 6.0 45.0 0.033 G1/4 7930 13 13 10.0 7.5 16.0 6.0 8.0 54.0 0.073 G3/8 7930 17 17 11.0 8.5 20.0 8.0 10.0 61.5 0.163 G1/2 7930 21 21 13.0 10.0 24.0 10.0 12.0 73.0 0.171 7931 Adjustable Check Valve Supply, Male/ Female BSPP Thread FDA chemical Nickel-plated brass, FKM C EE1FF1F2L Kg G1/8 7931 10 10 5.5 6.0 13.0 4.0 6.0 51.5 0.043 G1/4 7931 13 13 6.5 7.5 16.0 6.0 8.0 61.5 0.208 G3/8 7931 17 17 7.5 8.5 20.0 8.0 10.0 70.0 0.125 G1/2 7931 21 21 9.0 10.0 24.0 10.0 12.0 82.5 0.212
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