Overview of Primary Product

64
Boiler Controls
McDonnell & Miller
Boiler Controls
• For boiler receiver tanks
• Float operated
• Proportional feed action
• Soft seat provides positive seal
• Seal between float chamber and valve chamber is not a
positive seal
• Maximum water supply pressure 100 psi (7 kg/cm
2
)
• Maximum inlet water temperature 120˚F (49˚C)
• Maximum vessel pressure 35 psi (2.5 kg/cm
2
)
Series 25-A
E
G
C
D
A
F
H
J
B
Water Feeders – Make-Up
Series 25-A
Make-Up Water Feeder
Dimensions, in. (mm)
®
FEEDER DISCHARGE
WATER SUPPLY PRESSURE IN LBS. PER SQ. IN.
10,000
lbs./hr.
9,000
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
0
0psi 10 20 30 40 50 60 70 80 90 100
(0)(kg/cm
2
) (.7) (1.4) (2.1) (2.8) (3.5) (4.2) (4.9) (5.6) (6.3) (7.0)
(4536)
11,000(4990)
(kg/hr.)
(4082)
(3629)
(3175)
(2722)
(2268)
(1814)
(1361)
(907)
(454)
(0)
BOILER
22
20
18
16
14
12
10
8
6
4
2
0
(83.27)
(75.70)
(68.13)
(60.56)
(52.99)
(45.42)
(37.85)
(30.28)
(22.71)
(15.14)
(7.57)
(0)
gpm
(lpm)
319
290
261
232
203
174
145
116
87
58
29
0
(3127)
(2843)
(2559)
(2274)
(1990)
(1706)
(1421)
(1137)
(853)
(569)
(284)
(0)
hp
(Kilowatts)
M
a
x
i
m
u
m
C
a
p
a
c
i
t
y
Capacities
Ordering Information
Model Part Weight
Number Number Description lbs. (kg)
25-A 126800 Make-up water feeder 37.5 (17)
25-AB 126900 25-A w/float block 41.8 (19)
A BCD EF GH J
NPT NPT NPT NPT
13
⁄16 (21)
3
⁄4 12
1
⁄4 (311) 8
1
⁄8 (206) 1
1
⁄2 (12.7) 10
3
⁄8 (264) 1
3
⁄4