23 www.morbros.com PRESSURE/ VACUUMVENTS 922 749 Series #* :* ^ 6::' ^ " 6 < L @ 2M L @ 2M L % M L ZM L $ # M 749 & & $ & +$&& 749 & & $ & +$&& 749 2 & & $ $$ +$&& 749 2 & & $ $$ +$&& 749 S & & $ & +$&& 749 S & & $ & +$&& 749 S 2 & & $ $$ +$&& 749 S 2 & & $ $$ +$&& 749 CRB 2” 2! ! >$ +&&& 749 CRB 3” 2 $ +&&& 749 CRBS 2” $ >$ +&&& 749 CRBS 3” $ $ +&&& 749 BSP & & $ & +$&& 749 BSP & & $ & +$&& 749 T & & $ & +$&& Pressure/Vacuum Vent Vent valve used on underground and low volume aboveground tanks for motor fueling. Vent allows tank to ! $ Poppets seal vapors in the tanks when pressure is equalized. Settings are approximate. Fig. 749…2" or 3" NPT Fig. 749S…2" or 3" slip-on style Fig. 749CRB…2" or 3" NPT CARB approval (95-15A) for stage I and II (8 oz for stage I only).Viton® o-rings on pressure poppet. Fig. 749CRBS…2" or 3" slip-on style CARB approval (9515 A) for stage I and II (8 oz for stage I only). Viton® o-rings on pressure poppet. Fig. 749BSP… same as Fig. 749, but with British pipe threads. Fig. 749T ~ !$ %?* and stainless steel internals. WARNING…Fig. 749 P/V vent must only be used in $ $ ^ + $ handling in lines larger than that used for retail service stations can cause tank to rupture or implode. *:6 Body…aluminum Pressure Poppet…aluminum Vacuum Poppet…brass Pipe Seal…Buna-N Screen…40 mesh brass 749 T + Pressure Poppet…HDPE Vacuum Poppet…stainless steel Pipe Seal…Viton® Screen…40 mesh stainless steel Z ! Y ^X K $ + mechanical, high intensity audible alarm that alerts you when your tank is near full while also allowing your tank to breathe $ $ # $ with a whistle which incorporates a 2” or 3” full port pressure/ $$ $ ! { !+ $ ! $ is provided. The unit attaches to a 2” or 3” N.P.T. pipe mounted & $ { *& 2” Pressure relief setting ...... 6 oz/in2 or 8 oz/in2 2” Vacuum relief setting....... 1 oz/in2 2” Venting capacity (CFH)... 30,120 or 30,300 2” Weight................................ 7.5 lbs Construction Details Body…anodized aluminum Screens…stainless steel Rainguard…anodized aluminum Seals…Viton® Float…stainless steel NOTE…922 not for use on vapor recovery systems. Fig. 749 - 3" 3” Pressure relief setting ...... 6 oz/in2 or 8 oz/in2 3” Vacuum relief setting....... 1 oz/in2 3” Venting capacity (CFH)... 43,020 or 44,160 3” Weight................................ 5.25 lbs Fig. 922 WARNING…? $ $ $ + & are designed only for use on shop fabricated atmospheric tanks which have been built and tested in accordance with UL 142, NFPA 30 & 30A, and API 650 and in accordance with all applicable local, state and federal laws. In normal operation, dust and debris can accumulate in vent openings and block air passages. Certain atmospheric conditions such as a sudden drop in temperature, below freezing temperatures, and freezing rain can cause moisture to enter the vent and freeze which can restrict internal movement of vent mechanisms and block air passages. All storage tank vent air passages must be completely free of restriction and all vent mechanisms must have free movement in order to insure K + $ @ $ $$ !$ $ < $ $ - $ < $ < + < < $ +< & + < $ = conditions, by someone familiar with the proper operation of storage tank vents, is required to insure venting devices are functioning properly ! $ $ $ $$ $ ! $ $ ! = according to NFPA 30 (2008) 21.4.3 WARNING…In order for the Fig. 922 to function properly all emer- + < - tions, tank openings and piping connections must be airtight. Emergency vent should be set at least 2 oz. higher than the Fig. 922. Code Compliance Florida DEP EQ 227
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