
Types 66R and 66RR
2
2 (50)
NPT or CL125 FF
anged
NPT, CL150 RF, and
CL300 RF anged
3, 4
(80, 100)
CL125 FF anged CL150 RF anged
8 psig (0,55 bar), including build-up
10 psig (0,69 bar), including build-up
2-inches w.c. to 5 psig
(5 mbar to 0,34 bar) in 7 ranges
4-inches w.c. to 7 psig
(10 mbar to 0,48 bar) See Table 1
8 psig (0,55 bar)
10 psig (0,69 bar)
2-inch (51 mm)
3-inch (76 mm)
4-inch (102 mm)
-20° to 180°F (-29° to 82°C)
0° to 350°F (-18° to 177°C)
Adjusting screw
Internal or external
External on pilot and internal in main valve
Control Line (If Used): 3/4 NPT internal
Spring Case Vent: 3/4 NPT internal with removable
Type Y602-10 vent assembly
Pilot Body: 3/4 NPT internal
Pilot Diaphragm Case: 1/2 NPT internal
Pilot Spring Case: 1/4 NPT internal
NPT: 50 pounds (23 kg) for Type 66R or
65 pounds (30 kg) for Type 66RR
Flanged: 55 pounds (25 kg) for Type 66R or
70 pounds (32 kg) for Type 66RR
100 pounds (45 kg) for
Type 66R or 115 pounds (52 kg) for Type 66RR
155 pounds (70 kg) for
Type 66R or 170 pounds (77 kg) for Type 66RR
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
some of the pressure from the top of the main valve
diaphragm. At the same time, the inlet pressure increase
registers on the bottom of the main valve diaphragm.
The pressure differential acting on the main valve diaphragm
moves this diaphragm upward, opening the main valve.
Further increases in inlet pressure continue to open the pilot
valve disk and the main valve plug. When inlet pressure
returns to the pilot control spring setting, the pilot disk
closes, allowing inlet pressure to load the top of the main
valve diaphragm through the xed restriction. This equalizes
the pressures acting on this diaphragm, and the main valve
spring closes the main valve plug.
Standard
4 to 9-inches w.c. (10 to 22 mbar)
(1)
5 to 15-inches w.c. (12 to 37 mbar)
(1)
12 to 28-inches w.c. (30 to 70 mbar)
(1)
0.9 to 2.5 psig (0,06 to 0,17 bar)
1.3 to 4.5 psig (0,09 to 0,31 bar)
1B653827052
1B653927022
1B537027052
1B537127022
1B537227022
Red
Olive drab
Yellow
Light green
Light blue
0.085 (2,16)
0.105 (2,67)
0.114 (2,90)
0.156 (3,96)
0.187 (4,75)
3.625 (92,1)
3.750 (95,3)
4.188 (106)
4.060 (103)
3.938 (100)
Special 3.8 to 7 psig (0,26 to 0,48 bar) 1B537327052 Black 0.218 (5,54) 3.980 (101)
1. Published ranges are with the spring case pointed up.
Table 1. Type Y695RR Pilot Control Spring Selection
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