Data Sheet

Bulletin 71.1:66
D100114X012
November 2008
www.emersonprocess.com/regulators
66 Series Direct-Operated Regulators and
Vacuum Service Equipment
Introduction
Fisher
®
66 Series direct-operated pressure-reducing
regulators are widely used in burner control, tank
blanketing systems, and other applications where
precise control of low-pressure industrial gases is
needed, while 66 Series direct-operated vacuum service
equipment comes in both vacuum regulator and vacuum
breaker constructions. These products differ in pressure
capabilities and construction (Figures 1 through 4).
Features
 —
Minimum lockup at high as well as low inlet
pressures is provided on all regulators by a
balancing diaphragm that reduces unbalanced
forces acting on valve plug.
 
—Retainer (Figure 2) of standard
Type 66, 66Z, or 66ZZ valve plug assembly
closes against the orice before assembly can
over travel and thus over-compress O-ring.
 —Maximum
sensitivity and low outlet pressure accuracy
make this an ideal regulator for tank blanketing
(padding) applications.
  —Pitot tube of Type 66, 66Z, or 66ZZ
standard cast iron regulator registers body outlet
pressure from point of highest velocity, creating
a dynamic boost (Figure 5 or 6) that helps provide
a more nearly constant downstream pressure and
rapid adjustment to small demand changes.
  —Steel and stainless
steel bodies are available for increased resistance
to piping stresses or whenever dictated by local
codes. External registration is standard or optional
depending on construction for wherever a remote
control line is required.
Figure 1. Exterior of Type 66 or 66Z Regulator
W1935/IL