Product Overview | Gas Regulator
7333 Regulators reduce high gas supply pressures to practical use levels. Since capacities will vary with the pressure drop across the regulator (see Table D), due care must be exercised in properly sizing both the regulator and downstream piping. These regulators are pilot operated. Therefore they are an excellent choice when the application requires precise pressure control. SPECIFICATIONS Body Sizes and End Connections: 2" NPT, and 2" through 6" Class 125 FF Flanged Capacities: See Table D Maximum Emergency and Operating Inlet Pressure: 125 psig Maximum Emergency and Operating Outlet (Casing) Pressure: 82 psig Outlet Pressure Range: 3-40 psig Pressure Registration: External (upstream and downstream sensing lines required) Pressure Registration Connection: ¼ " NPT upstream, ½ " NPT downstream Pilot Vent Connection: ¼ " NPT Materials of Construction:
Table A. Specific Gravity Correction Factor Sp Gr Factor 0.4 1.22 0.6 1.00 1.0 0.774 1.5 0.632 2.0 0.547
If the specific gravity of the gas is other than 0.6, divide desired flow by gravity factor to get equivalent flow of natural gas; then select regulator from Table D. Multiply a given size regulator's natural gas capacity by gravity factor to get regulator capacity with different gas. RELIEF VALVES The North American 7333 Regulators, do not have internal relief valves. A small capacity external relief valve is recommended to be installed downsteam of the 7333 regulator, see Bulletin 7377 for relief valves. INSTALLATION The North American 7333 regulator may be installed in any orientation as long as the flow through it matches the direction arrow cast on the body. The 7333 regulator requires an external sensing line upstream and downstream of the regulator. OVERPRESSURE PROTECTION Like most pressure-reducing regulators, the 7333 Regulators have outlet pressure ratings that are lower than the inlet pressure rat- ings. Therefore, a pressure relieving or pressure limiting device is needed if the inlet pressure can exceed the outlet pressure rating, see "Table C" and “SPECIFICATIONS”. This regulator does not have an internal relief feature. A down- stream token relief is recommended for small pressure changes. (See bulletin 7377).
Body: Cast Iron Actuator: Steel Pilot body and Spring case: Aluminum Diaphragam: NBR Cage and Trim: SST
Temperature Limits: -20°F to 180°F
SELECTION Example: Select a regulator for 200,000 scfh of 0.6 specific gravity natural gas from 30 psig supply pressure to 4 psig outlet pressure.
Solution: Entering Table D, the regulator with the appropriate capacity is determined to be the 3" 7333-6.
Bulletin 7333 Page 2
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