V74G EXCELON® Series 74 Pressure Relief Valve 3/8", 1/2", 3/4" Port Sizes ● EXCELON design allows in-line or modular installation ● Push to lock adjusting knob with tamper resistant accessory ● Easily disassembled for servicing without removal from air line ● Helps protect air operated equipment from over pressure by retarding excessive pressure build up Technical Data Ordering Information Fluid: compressed air Operating Temperature*: -20° to 80°C See Ordering Information on following pages. * Air supply must be dry enough to avoid ice formation at temperatures below 2°C. Gauge ports: 1/4" PTF with PTF main ports 1/4" ISO Rc with ISO Rc main ports 1/8" ISO Rc with ISO Rc main ports Materials: Body: Aluminium Bonnet: Aluminium Valve: Aluminium and Nitrile Elastomers: Nitrile Bottom plug: Acetal 5/96 ISO Symbols Our policy is one of continued research and development. We therefore reserve the right to amend, without notice, the specifications given in this document. N/UK 8.9.043.01 Issue No.1 Revision 0 V74G Typical Performance Characteristics RELIEF CURVE 12 INLET PRESSURE - bar PORT SIZE: 1/2" RANGE: 0,3 to 10 bar 9 6 3 0 0 20 40 60 80 100 RELIEF FLOW - dm3/s Ordering Information. Models listed include ISO G parallel threads, knob adjustment and a 0,3 to 10 bar relief pressure adjustment range*. Port Size G3/8 G1/2 G3/4 Model V74G-3GK-NMN V74G-4GK-NMN V74G-6GK-NMN Weight kg 0,69 0,68 0,67 Alternative Models V 7 4 G - ★ ★ ★ - N ★ ★ Threads PTF ISO Rc taper ISO G parallel Substitute A B G Adjustment Knob T-bar Substitute K T * Relief valve can be adjusted to pressures in excess of, and less than, those specified. Do not use these units to control pressures outside of the specified ranges. Gauge With (∅ 50 mm) Without Substitute G N Relief Pressure Adjustment Range* 0,3 to 4 bar 0,3 to 10 bar 0,7 to 17 bar** Substitute F M S ** Units with 17 bar relief pressure range are available only with the T-bar adjustment; therefore substitute T at the 7th position and S at the 12th position. Accessories Wall Mounting Bracket ∅ 50 mm Gauge R1/8 Connection Metal Panel Nut Tamper Resistant Cover & Seal Wire†† 4324-50 4 bar: 18-013-011 10 bar: 18-013-013 25 bar: 18-013-014 4348-89 4355-51 Seal Wire: 2117-01 †† Use padlock with shackle up to 8 mm (0.3") in diameter. N/UK 8.9.043.02 Issue No.1 Revision 0 Our policy is one of continued research and development. We therefore reserve the right to amend, without notice, the specifications given in this document. 5/96 V74G 56 56 37 37 74 74 Panel mounting hole diameter: 52 mm Panel thickness: 2 to 6 mm 80 Bracket Mounting 151 43 43 127 80 Bracket Kit Reference 69 Use 5 mm screws to mount bracket to wall. Part No. 4324-50 79 51 Model All Models Port C L 37 20 Port C L 61 6 50 5 25 4 Service Kits Item Type Part Number Service kit Diaphragm & Seal 4384-700 Service kit includes diaphragm, bottom plug o-ring. 5/96 Our policy is one of continued research and development. We therefore reserve the right to amend, without notice, the specifications given in this document. N/UK 8.9.043.03 Issue No.1 Revision 0 V74G Warning These products are intended for use in industrial compressed air systems only. Do not use these products where pressures and temperatures can exceed those listed under ‘Technical Data’. Before using these products with fluids other than those specified, for nonindustrial applications, life-support systems, or other applications not within published specifications, consult NORGREN. Through misuse, age, or malfunction, components used in fluid power systems can fail in various modes. The system designer is warned to consider the failure modes of all component parts used in fluid power systems and to provide adequate safeguards to prevent personal injury or damage to equipment in the event of such failure. System designers must provide a warning to end users in the system instructional manual if protection against a failure mode cannot be adequately provided. System designers and end users are cautioned to review specific warnings found in instruction sheets packed and shipped with these products. N/UK 8.9.043.04 Issue No.1 Revision 0 Our policy is one of continued research and development. We therefore reserve the right to amend, without notice, the specifications given in this document. 3/96