Overview of Primary Product

68
Boiler Controls
McDonnell & Miller
Boiler Controls
Water Feeders – Make-Up
• For applications where water is added to steam
separators, receivers, tanks, or other vessels
• Proportional feed action
• Quick-change replaceable cartridge valve and strainer
• Optional features
– Float Block
• Maximum water supply pressure 75 psi (5.3 kg/cm
2
)
• Maximum inlet water temperature 120˚F (49˚C)
•
Maximum vessel pressure 25 psi (1.8 kg/cm
2
)
551-S
F
D
E
H
C
B
G
J
A
CLOSING
LEVEL
Series 551-S
Make-Up Water Feeder
Dimensions, in. (mm)
ABCDEFGHJ
NPT NPT NPT
4
5
⁄8 (117)
1
⁄8 (3.2) 1 12
1
⁄4 (311) 4
1
⁄8 (105) 10
3
⁄8 (264) 1 6
11
⁄16 (170)
3
⁄4
Ordering Information
Model Part Weight
Number Number Description lbs. (kg)
551-S 136400 Make-up water feeder 35.8 (16.2)
551-SB 136500 551-S w/float block 35.8 (16.2)
FEEDER DISCHARGE
WATER SUPPLY PRESSURE IN LBS. PER SQ. IN.
(Available city water supply pressure, or pump pressure,
less internal pressure of unit on which control is installed)
BOILER
lbs./hr.
7,000
6,000
5,000
4,000
3,000
2,000
1,000
0
0psi 10 20 30 40 50 60 70
(0)(kg/cm
2
) (.7) (1.4) (2.1) (2.8) (3.5) (4.2) (4.9)
(kg/hr.)
gpm
(lpm)
hp
(Kilowatts)
14
12
10
8
6
4
2
0
(52.99) 203 (1990)
174 (1706)
145 (1421)
116 (1137)
87 (853)
58 (569)
29 (284)
0 (0)
(45.42)
(37.85)
(30.28)
(22.71)
(15.14)
(7.57)
(0)
(3175)
(2722)
(2268)
(1814)
(1361)
(907)
(454)
(0)
M
a
x
i
m
u
m
C
a
p
a
c
i
t
y
Capacities