Bulletin 74.1:Y690A
3
Table 3. Construction Materials
BODY DIAPHRAGM CASE SPRING CASE TRIM DIAPHRAGM DISK
Ductile iron or
CF8M Stainless steel
Ductile iron or
CF8M Stainless steel
Ductile iron or
CF8M Stainless steel
303 Stainless steel,
316 Stainless steel
Nitrile (NBR),
Fluorocarbon (FKM), or
Polytetrauoroethylene
(PTFE) bonded
Nitrile (NBR)
Nitrile (NBR),
Fluorocarbon (FKM),
Peruoroelastomer (FFKM),
PTFE, or
Ethylenepropylene (EPDM)
Table 4. Maximum Operating Inlet Pressures in Psig (bar)
ORIFICE
SIZE,
INCHES (mm)
OUTLET PRESSURE RANGES
Type Y690A Types Y690AH and Y690AM
1 to
2.5-Inches w.c.
(2 to 6 mbar)
2.5 to
7-Inches w.c.
(6 to 17 mbar)
5 to
10-Inches w.c.
(12 to 25 mbar)
7 to
16-Inches w.c.
(17 to 40 mbar)
15-Inches w.c.
to 1.2 Psig
(37 to 83 mbar)
1.2 to 2.5 Psig
(83 mbar
to 0,17 bar)
2.5 to 4.5 Psig
(0,17 to 0,31 bar)
4.5 to 7 Psig
(0,31 to 0,48 bar)
1/8 (3,2) 150 (10,3) 150 (10,3) 150 (10,3) 150 (10,3) 150 (10,3) 150 (10,3) 150 (10,3) 150 (10,3)
1/4
3/8
(6,4)
(9,5)
40
20
(2,8)
(1,4)
60
20
(4,1)
(1,4)
75
35
(5,2)
(2,4)
75
35
(5,2)
(2,4)
75
35
(5,2)
(2,4)
150
60
(10,3)
(4,1)
150
60
(10,3)
(4,1)
150
60
(10,3)
(4,1)
1/2
9/16
(13)
(14)
10
5
(0,69)
(0,34)
10
5
(0,69)
(0,34)
8
5
(0,55)
(0,34)
8
5
(0,55)
(0,34)
8
5
(0,55)
(0,34)
10
6
(0,69)
(0,41)
12
8
(0,83)
(0,55)
12
8
(0,83)
(0,55)
Table 1. End Connection Styles
BODY SIZE,
NPS (DN)
END CONNECTION STYLE
Ductile Iron Stainless Steel
3/4 or 1
(20 or 25)
NPT
NPT, SWE,
CL150 RF,
CL300 RF, or
PN 16/25/40
Table 2. Orice Sizes and Flow and Sizing Coefcients
ORIFICE SIZE,
INCHES (mm)
WIDE-OPEN FOR RELIEF
VALVE SIZING
C
1
IEC SIZING COEFFICIENTS
C
g
C
V
X
T
F
D
F
L
1/8
1/4
3/8
1/2
9/16
(3,2)
(6,4)
(9,5)
(13)
(14)
12.3
50
110
200
250
0.35
1.43
3.14
5.71
7.14
35 0.78 0.50 0.89
Table 5. Outlet (Control) Pressure Ranges and Spring Part Numbers
TYPES
OUTLET (CONTROL)
PRESSURE RANGE
SPRING PART
NUMBER
SPRING
COLOR
SPRING WIRE DIAMETER,
INCHES (mm)
SPRING FREE LENGTH,
INCHES (mm)
Y690A and
Y690AM
1 to 2.5-inches w.c.
2.5 to 7-inches w.c.
(2 to 6 mbar)
(6 to 17 mbar)
1B558527052
(1)(2)
1B653827052
(1)
Orange
Red
0.072
0.085
(1,83)
(2,16)
3.78 (96,0)
3.63 (92,2)
Y690AH and
Y690AHM
5 to 10-inches w.c.
7 to 16-inches w.c.
15-inches w.c. to 1.2 psig
(12 to 25 mbar)
(17 to 40 mbar)
(37 to 83 mbar)
1B653827052
1B653927022
1B537027052
Red
Unpainted
Yellow
0.085
0.105
0.114
(2,16)
(2,67)
(2,90)
3.63 (92,2)
3.75 (95,2)
4.31 (109)
1.2 to 2.5 psig
2.5 to 4.5 psig
4.5 to 7 psig
(83 mbar to 0,17 bar)
(0,17 to 0,31 bar)
(0,31 to 0,48 bar)
1B537127022
1B537227022
1B537327052
Light green
Light blue
Black
0.156
0.187
0.218
(3,96)
(4,75)
(5,54)
4.06 (103)
3.94 (100)
3.98 (101)
1. To achieve the published outlet pressure range the spring case must be installed pointing down.
2. Do not use uorocarbon (FKM) diaphragm with this spring at diaphragm temperatures lower than 60°F (16°C).
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