Data Sheet

Bulletin 71.1:Y690A
2
Specications
Available Congurations
Type Y690A: Direct-operated pressure reducing
regulator for outlet pressures up to 7-inches w.c. /
17 mbar equipped with a pitot tube.
Type Y690AH: Direct-operated pressure reducing
regulator for outlet pressures up to 7 psig / 483 mbar
equipped with a pitot tube.
Type Y690AM: Direct-operated pressure reducing
regulator for outlet pressures up to 7-inches w.c. /
17 mbar equipped with a blocked throat and O-ring stem
seal. The lower diaphragm casing is tapped 1/2 NPT for
control line connection.
Type Y690AHM: Direct-operated pressure reducing
regulator for outlet pressures up to 7 psig / 483 mbar
equipped with a blocked throat and O-ring stem seal.
The lower diaphragm casing is tapped 1/2 NPT for
control line connection.
Body Size
NPS 3/4 or 1 / DN 20 or 25
End Connection Styles
See Table 1
Maximum Allowable Inlet Pressure
(1)
150 psig / 10.3 bar
Maximum Operating Inlet Pressure
(1)
See Table 4
Maximum Outlet (Casing) Pressure
(1)
150 psig / 10.3 bar
Maximum Emergency Outlet Pressure to Avoid Internal
Parts Damage
(1)
150 psig / 10.3 bar
Pressure Registration
Types Y690A and Y690AH: Internal
Types Y690AM and Y690AHM: External
Outlet Pressure Ranges
(1)
See Table 5
Orice Sizes and Flow and Sizing Coefcients
See Table 2
Flow Capacities
See Tables 6 and 7
Construction Materials
See Table 3
Temperature Capabilities
(1)
Nitrile (NBR):
-20 to 180°F / -29 to 82°C
Fluorocarbon (FKM):
40 to 300°F / 4 to 149°C
Ethylenepropylene (EPDM):
-20 to 275°F / -29 to 135°C
Peruoroelastomer (FFKM):
-20 to 300°F / -29 to 149°C
Pressure Setting Adjustment
Adjusting Screw
Spring Case Connection
1/4 NPT
Diaphragm Case Connection
1/2 NPT
Approximate Weight
19 pounds / 8.6 kg
1. The pressure/temperature limits in this Bulletin and any applicable standard or code limitation should not be exceeded.
Table 1. Body Size and End Connection Styles
Table 2. Flow and Sizing Coefcients
BODY SIZE
END CONNECTION STYLES
Ductile Iron Stainless Steel
NPS 3/4 or 1 / DN 20 or 25 NPT NPT, CL150 RF, CL300 RF, or PN 16/25/40
ORIFICE SIZE
WIDE-OPEN C
g
FOR
RELIEF VALVE SIZING
WIDE-OPEN C
V
FOR
RELIEF VALVE SIZING
C
1
IEC SIZING COEFFICIENTS
Inches mm 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 3. Construction Materials
BODY DIAPHRAGM CASE SPRING CASE TRIM DIAPHRAGM DISK
Ductile iron,
Stainless steel
Ductile iron or
Stainless steel
Ductile iron or
Stainless steel
Stainless steel
Nitrile (NBR), Fluorocarbon (FKM), or
Polytetrauoroethylene (PTFE)
bonded Nitrile (NBR)
Nitrile (NBR), Fluorocarbon (FKM),
Peruoroelastomer (FFKM), PTFE,
or Ethylenepropylene (EPDM)