Pneumatic And Hydraulic Equipment Page 701

Relief valves are used in compressed air systems to retard excessive air pressure buildup and thereby help prevent damage to system components. Relief pressure is controlled by the adjusting knob (1). Clockwise rotation increases and counterclockwise rotation decreases the relief pressure setting. Inlet pressure is applied to the bottom of the diaphragm (2) and tends to move the diaphragm upward and off the diaphragm seat (3). The relief spring (4) applies a downward force on the diaphragm and tends to hold the diaphragm down against the seat. If the air pressure force becomes greater than the relief spring force, the diaphragm will move upward away from the seat. This allows air to escape through the outlet port. When the inlet air pressure decreases to the relief pressure setting, the downward force of the relief spring becomes greater than the upward force of the inlet air pressure. The diaphragm then moves down against the seat, preventing further relief flow. GENERAL PURPOSE PRESSURE RELIEF VALVES Relief pressure can be factory preset. Easily disassembled for servicing without removal from air line. V72 has a bottom relief port, providing simple inline installation. Low torque, nonrising pressure adjustment knob on V07, V72, and V74 provides easy hand adjustment at any pressure. V74 with 250 psig spring equipped with a T-handle adjustment. RELIEF VALVE OPERATION Field Accessories Price V07 - Mounting Bracket with Plastic Panel Nut: 18-025-003 $7.85 Plastic Panel Nut: 2962-89 $4.25 Metal Panel Nut: 2962-04 $3.65 Tamper Resistant Seal Device for Adjusting Knob: 18-001-094 $6.70 V72 - Mounting Bracket: 4224-50 $10.50 Tamper Resistant Seal Device for Adjusting Knob: 4255-51 $9.85 V74 - Mounting Bracket: 4324-50 $12.95 Tamper Resistant Seal Device for Adjusting Knob: 4355-51 $13.40 Service Kits Price V07: 3407-80 $7.45 V72: 4209-03 $11.75 V74: 4384-700 $51.80 MODELS WITHOUT GAUGE Relief Pressure Adjustment Ranges Port Size 1 to 10 psig 5 to 50 psig 5 to 60 psig Type PTF Part No. Price Part No. Price Part No. Price V07 1/8 V07-100-NNAA $34.95 V07-100-NNEA $51.60 - 1/4 V07-200-NNAA $35.15 V07-200-NNEA $26.50 - V72 1/4 - - V72G-2AK-NFN $53.35 3/8 - - V72G-3AK-NFN $55.10 V74G 3/8 - - V74G-3AK-NFN $88.90 1/2 - - V74G-4AK-NFN $88.90 3/4 - - V74G-6AK-NFN $88.90 MODELS WITHOUT GAUGE R elief Pressure Adjustment Ranges Port Size 5 to 125 psig 5 to 150 psig 10 to 250 psig Type PTF Part No. Price Part No. Price Part No. Price V07 1/8 V07-100-NNKA $26.50 - 1/4 V07-200-NNKA $26.50 - V72 1/4 - - V72G-2AK-NMN $53.35 - 3/8 - - V72G-3AK-NMN $55.10 - V74G 3/8 - - V74G-3AK-NMN $88.90 V74G-3AT-NSN $94.05 1/2 - - V74G-4AK-NMN $88.90 V74G-4AT-NSN $94.05 3/4 - - V74G-6AK-NMN $88.90 V74G-6AT-NSN $94.05 N O R G R E N Norgren JHF Catalog [ Volume 7 ] (314) 427-0600 800-444-0522 (FAX) 314-427-3502 www. j hf.com 701 Prices Subject to Change Without Notice John Henry Foster pneumatic and hydraulic equipment

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