Product Overview | Differential Regulator
An Oil Pressure Differential Regulator maintains a constant drop across an oil valve. The regulator thus assures constant flow of oil at a given valve setting. This permits electrical or mechanical "linking" of motorized oil and combustion air valves for close control of input and ratio. 7458A Regulators are located upstream of the oil valve, and cross-connected downstream of it, per Figure 1. Oil flow is not affected by pressure fluctuations in burner atomizers due to variations in steam or compressed air flow. These regulators are used with North American 5643, 5646, and other full- and semi-emulsion atomizers. The 7458A is suitable for light oil while a high temperature model 7458A- -H is used with heavy oils. Pressure drop (differential) across the down- stream valve is adjusted by a hand-wheel on the regulator. Three springs are available to provide differentials from 2 to 30 psi.
CONSTRUCTION Body: cast steel Spring case: cast steel Trim: stainless steel Diaphragm: Viton for 7458A, stainless steel for 7458A- -H Maximum inlet pressure: 300 psi Maximum outlet pressure: 125 psi Maximum temperature: 300°F for 7458A, 450°F for 7458A- -H
To Burner
Oil
Oil Differential Pressure Regulator
Oil Control Valve
Figure 1. Schematic installation of Oil Differential Pressure Regulator.
7458A CAPACITIES FOR LIGHT OIL gph at 0.85 sp gr and 40 SSU viscosity
Inlet
Outlet
Pressure,
Pressure,
7458-01
7458-0
7458-1
psi
psi 100
(95LD-1/2")
(95LD-3/4")
(95LD-1")
180 300 180 300 120 180
720 780 720 780 420 600
780
150
75
1020
100
780
125
75 90 75
1020
480 720
100
7458A- -H CAPACITIES FOR HEAVY OIL gph at 1.0 sp gr and 150 SSU viscosity
Inlet
Outlet
Pressure,
Pressure,
7458-01-H (95LD-1/2")
7458-0-H (95LD-3/4")
7458-1-H (95LD-1")
psi
psi 100
120 180 120 180
420 480 420 480 240 360
480 600 480 600 300 420
150
75
100
125
75 90 75
78
100
120
Bulletin 7458A Page 2
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