Inlet Outlet
Pressure,
Pressure,
7458-01
7458-0
7458-1
psi
psi
(95LD-1/2") (95LD-3/4") (95LD-1")
150 100
180 720
780
75
300
780
1020
125 100
180 720
780
75
300
780
1020
100 90
120 420
480
75
180
600
720
Figure 1. Schematic installation of Oil Diff erential Pressure Regulator.
Oil
Oil Diff erential
Pressure Regulator
Oil Control
Valve
To Burner
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
An Oil Pressure Diff erential Regulator maintains a constant drop
across an oil valve. The regulator thus assures constant fl ow 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 fl ow is not
aff ected by pressure fl uctuations in burner atomizers due to
variations in steam or compressed air fl ow.
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 (diff erential) across the down-
stream valve is adjusted by a hand-wheel on the regulator. Three
springs are available to provide diff erentials from 2 to 30 psi.
Inlet Outlet
Pressure,
Pressure,
7458-01-H
7458-0-H
7458-1-H
psi
psi
(95LD-1/2") (95LD-3/4")
(95LD-1")
150 100 120
420
480
75
180
480
600
125 100 120
420
480
75
180
480
600
100 90 78
240
300
75
120
360
420
Bulletin 7458A
Page 2
Product Overview | Diff erential Regulator
7458A CAPACITIES FOR LIGHT OIL
gph at 0.85 sp gr and 40 SSU viscosity
7458A- -H CAPACITIES FOR HEAVY OIL
gph at 1.0 sp gr and 150 SSU viscosity
