Types 66, 66Z, and 66ZZ
2
Specifications
Body Sizes and End Connection Styles
(1)
Maximum allowable inlet Pressures
(1)
Emergency inlet Pressure:
Type 66, 66Z, 66ZZ, or 66 Series Vacuum
Breakers:
25 psig (1,72 bar) positive pressure
66 Series Vacuum Regulators:
8 psig or
16.3-inches of mercury (0,55 bar
differential) vacuum
Maximum Safe Pressure to avoid internal
Parts Damage:
Type 66:
10 psig (0,69 bar)
Type 66Z: 5 psig (0,34 bar)
Type 66ZZ:
2 psig (0,14 bar)
66 Series Vacuum Regulators or Breakers:
No more than 1 psig (0,07 bar differential) change
from spring setting
Maximum Operating inlet Pressure
Recommended for good Performance:
Type 66, 66Z, or 66 Series Vacuum Breakers:
5 psig (0,34 bar) positive pressure
Type 66ZZ: 2 psig (0,14 bar)
66 Series Vacuum Regulator:
6-inches w.c. or
0.4-inch of mercury (15 mbar differential) vacuum
Maximum allowable Outlet Pressures
(1)
Emergency Outlet (Casing) Pressure:
Type 66, 66Z, or 66ZZ:
8 psig (0,55 bar)
positive pressure
66 Series Vacuum Regulator:
14.7 psi or
29.9-inches of mercury (1,01 bar
differential) vacuum
66 Series Vacuum Breakers:
8 psi or 16.3-inches
of mercury (0,55 bar differential) vacuum
Maximum Safe Pressure to avoid internal
Parts Damage:
Type 66, 66Z, or 66ZZ:
1 psig (0,07 bar
differential) above outlet pressure setting
66 Series Vacuum Regulator:
No more
than 1 psig (0,07 bar differential) change from
spring setting
COnSTRuCTiOn
nOMinal
BODy SiZE,
inCh (Dn)
EnD COnnECTiOn STylES
anD RaTingS
(1)
Standard Cast
iron Body
Optional Steel
Body
Type 66, 66Z,
66ZZ, or 66
vacuum
regulators
or breakers
2 (50)
NPT or CL125 FF
NPT (all types),
CL150 RF (all
types), CL150 FF,
CL300 RF
3, 4 (80, 100)
CL125 FF
CL150 RF
Maximum Operating Pressure Recommended
for good Performance (66 Series Vacuum
Regulators or Breakers Only):
Vacuum Regulators:
10 psig or 20.4-inches of
mercury (0,69 bar differential) vacuum
Vacuum Breakers:
6-inches w.c. or 0.4-inch of
mercury (15 mbar differential) vacuum
Elastomer Temperature Capabilities
nitrile (nBR) Standard Elastomers:
-40°to 180°F (-40°to 82°C)
Fluorocarbon (FKM) Elastomers:
0°to 350°F (-18°to 177°C)
Ethylenepropylene (EPDM) Elastomers:
-40°to 275°F (-40° to 135°C)
Pressure Registration
Type 66, 66Z, or 66ZZ
Cast Iron Body:
Internal
(standard)
or external
Steel Body:
External
(standard)
or internal
66 Series Vacuum Regulators or
Breakers:
External
Control line when used:
3/4-inch NPT standard
Bottom Flange line when used:
1/4-inch NPT
standard with removable plug
Spring Case Vent:
3/4-inch NPT standard with
removable Type Y602-10 vent assembly
Outlet (Control) Pressure Ranges
See Tables 1A through 1C
Control line Connection
3/4-inch NPT
Flow and Sizing Coefficients
See Tables 2 and 3
approximate Weights
2-inch (Dn 50) Body
NPT:
50 pounds (22,7 kg)
Flanged:
55 pounds (25,0 kg)
3-inch (Dn 80) Flanged Body:
100 pounds (45,4 kg)
4-inch (Dn 100) Flanged Body:
155 pounds (70,3 kg)
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation for valve should not be exceeded.
