Product Overview | Gas Regulator
7335 Regulators reduce gas supply pressures to discharge pressures ranging from 48 osi to atmospheric. Flow capacities on natural gas range from 9000 to 200 000 cfh. Regulators are suitable for natural gas, propane, LP gas, or dry air.
OVERPRESSURE PROTECTION Like most pressure-reducing regulators, the 7335 regulators have outlet pressure ratings that are lower than the inlet pressure ratings. Therefore, a pressure relieving or pressure limiting device is needed if the inlet pressure can exceed the outlet pressure rating, see "Table 2". This regulator does not have an internal relief feature.
SPECIFICATIONS Body Sizes and End Connections: 1" to 3" NPT Maximum Operating Inlet Pressure: See Table 2 Capacities: See Table 1 Maximum Emergency Inlet Pressure: See Table 2 Maximum Outlet (Casing) Pressure: See Table 2
To determine wide-open flow capacity of a regulator for relief sizing, use the following formulas.
If ( < 1.894 ) : P 1 P 0 If ( ≥ 1.894 ) : P 1 P 0
RATIO REGULATOR SERVICE 7335- -0 Regulators that can be set for zero outlet pressures can be used as cross-connected ratio regulators. The regulator 1" vent is connected to the combustion air line with ½" pipe or 5⁄8 ", or ¾" OD tubing (bushing up to 1" at the regulator). For maximum diaphragm pressure differential, See Table 2. INSTALLATION Regulators should be installed in horizontal clean pipe with unions on each side to facilitate removal for servicing. Apply pipe compound to threaded pipe ends only. If 7335 Regulator is used with other downstream regulators, they should be separated by at least 15 pipe diameters to avoid interaction. At higher capacities, it is necessary to increase discharge pipe size (use a reducing coupling). Use Figure 4 to select proper discharge pipe size. Figure 3 is a guide for piping and installation. An external line is required to sense downstream pressure and provide control feedback to regulator. When necessary, an orifice is added to this line to dampen pulsation. Correct size is largest orifice that effectively controls pulsation. Maximum Operating Outlet Pressure to Avoid Internal Parts Damage - The Outlet Pressure Rating: See Table 2 Temperature Capabilities: -20° to 150°F (-29° to 66°C) Pressure Registration: An external, downstream control line is required.
P 0 P 1 P 0 Q = K √ ( )
KP 1 Q = 2
P 0 P 1
= outlet pressure, psia* = inlet pressure, psia
Q = fl ow rate, SCFH K = regulator constant (see below)
* = P 0 is the regulator maximum allowable outlet pressure deter- mined by the regulator's outlet pressure rating and the pressure ratings of downstream system components.
Regulator Size
K
1"
1400 2750 4750
1 ½ "
2" 3"
11 000
Bulletin 7335 Page 2
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