Installation Guide
D100247X014
English – November 2008
Type 66, 66Z and 66ZZ
Introduction
This installation guide provides instructions for
installation, startup and adjustment. To receive a
copy of the instruction manual, contact your local
Sales Office or view a copy at www.fisher.com. For
further information refer to: Types 66, 66Z and 66ZZ
Instruction Manual, D100247X012.
PED Categories
This product may be used as a safety accessory with
pressure equipment in the following Pressure Equipment
Directive categories. It may also be used outside of the
Pressure Equipment Directive using sound engineering
practice (SEP) per table below. For information on the
current PED revision see Bulletin: D103053X012.
PRODUCT SIZE CATEGORIES FLUID TYPE
DN 50 to 100 / 2 to 4 in. SEP 1
Specifications
Body Sizes and Styles
See Table 1
Maximum Allowable Inlet Pressures
Emergency Inlet Pressure:
Type 66, 66Z, 66ZZ or 66 Series Vacuum
Breakers: 1.72 bar / 25 psig positive pressure
66 Series Vacuum Regulators: 0.55 bar
differential / 8 psig or 16.3 in. Hg vacuum
Maximum Safe Pressure to Avoid Internal
Parts Damage:
Type 66: 0.69 bar / 10 psig
Type 66Z: 0.34 bar / 5 psig
Type 66ZZ: 0.14 bar / 2 psig
66 Series Vacuum Regulators or Breakers:
No more than 0.07 bar differential / 1 psig change
from spring setting
Maximum Operating Inlet Pressure
Recommended for Good Performance:
Type 66, 66Z or 66 Series Vacuum Breakers:
0.34 bar / 5 psig positive pressure
Type 66ZZ: 0.14 bar / 2 psig
66 Series Vacuum Regulator: 15 mbar differential /
6 in. w.c. or 0.4 in. Hg vacuum
Maximum Allowable Outlet Pressures
Emergency Outlet (Casing) Pressure:
Type 66, 66Z or 66ZZ: 0.55 bar / 8 psig
positive pressure
(1)
(1)
66 Series Vacuum Regulator: 1.01 bar differential /
14.7 psi or 29.9 in. Hg vacuum
66 Series Vacuum Breakers: 0.55 bar differential /
8 psi or 16.3 in. Hg vacuum
Maximum Safe Pressure to Avoid Internal
Parts Damage:
Type 66, 66Z or 66ZZ: 0.07 bar differential / 1 psig
above outlet pressure setting
66 Series Vacuum Regulator: No more than 0.07 bar
differential / 1 psig change from spring setting
Maximum Operating Pressure Recommended
for Good Performance (66 Series Vacuum
Regulators or Breakers Only):
Vacuum Regulators: 0.69 bar differential / 10 psig
or 20.4 in. Hg vacuum
Vacuum Breakers: 15 mbar differential / 6 in. w.c.
or 0.4 in. Hg vacuum
Proof Test Pressure
All Pressure Retaining Components have been
proof tested per Directive.
Outlet Control Pressure Ranges
(1)
See Table 2
Elastomer Temperature Capabilities
Nitrile (NBR) Standard Elastomers: -40 to 82°C /
-40 to 180°F
Fluorocarbon (FKM) Elastomers: -18 to 177°C /
0 to 350°F
Ethylenepropylene (EPDM) Elastomers: -40 to
135°C / -40 to 275°F
Installation
WARNING
!
Only qualified personnel should install
or service a regulator. Regulators
should be installed, operated and
maintained in accordance with
international and applicable codes
and regulations and Emerson Process
Management Regulator Technologies,
Inc. instructions.
If the regulator vents fluid or a leak
develops in the system, it indicates that
service is required. Failure to take the
regulator out of service immediately may
create a hazardous condition.
1. The pressure/temperature limits in this installation guide and any applicable standard or code limitation should not be exceeded.
Types 66, 66Z and 66ZZ
Personal injury, equipment damage
or leakage due to escaping fluid
or bursting of pressure-containing
parts may result if this regulator is
overpressured or is installed where
service conditions could exceed the
limits given in the Specifications
section, or where conditions exceed
any ratings of the adjacent piping or
piping connections.
To avoid such injury or damage, provide
pressure-relieving or pressure-limiting
devices (as required by the appropriate
code, regulation or standard) to
prevent service conditions from
exceeding limits.
Additionally, physical damage to the
regulator could result in personal injury
and property damage due to escaping
fluid. To avoid such injury and damage,
install the regulator in a safe location.
Clean out all pipelines before installation of the
regulator and check to be sure the regulator has not
been damaged or has collected foreign material during
shipping. For NPT bodies, apply pipe compound to
the external pipe threads. For flanged bodies, use
suitable line gaskets and approved piping and bolting
practices. Install the regulator in any position desired,
unless otherwise specified, but be sure flow through
the body is in the direction indicated by the arrow on
the body.
Install Types 66, 66Z and 66ZZ regulators horizontally
with the spring case vertically above the valve body.
Note
It is important that the regulator be
installed so that the vent hole in the
spring case is unobstructed at all times.
For outdoor installations, the regulator
should be located away from vehicular
traffic and positioned so that water, ice
and other foreign materials cannot enter
the spring case through the vent. Avoid
placing the regulator beneath eaves or
downspouts, and be sure it is above the
probable snow level.
With steel bodies, an external control line is required.
Connect DN 20 / 3/4 in. NPT control line to the lower
diaphragm casing connection from the point where the
downstream pressure is to be sensed.
Overpressure Protection
The recommended pressure limitations are
stamped on the regulator nameplate. Some type of
overpressure protection is needed if the actual inlet
pressure exceeds the maximum operating outlet
pressure rating. Overpressure protection should
also be provided if the regulator inlet pressure
is greater than the safe working pressure of the
downstream equipment.
Regulator operation below the maximum pressure
limitations does not preclude the possibility of damage
from external sources or debris in the line. The
regulator should be inspected for damage after any
overpressure condition.
Startup
The regulator is factory set at approximately
the midpoint of the spring range or the pressure
requested, so an initial adjustment may be required
to give the desired results. With proper installation
completed and relief valves properly adjusted, slowly
open the upstream and downstream shutoff valves.
Adjustment
To change the outlet pressure, remove the closing
cap or loosen the locknut and turn the adjusting
screw clockwise to increase outlet pressure or
counterclockwise to decrease pressure. Monitor
the outlet pressure with a test gauge during the
adjustment. Replace the closing cap or tighten the
locknut to maintain the desired setting.
Taking Out of Service (Shutdown)
WARNING
!
To avoid personal injury resulting from
sudden release of pressure, isolate
the regulator from all pressure before
attempting disassembly.
Parts List
Key Description
1 Valve Body
2 Upper Diaphragm Casing
3 Lower Diaphragm Casing
4 Diaphragm Plate
5* Diaphragm
6 Spring
7 Bottom Flange
8* O-ring
9 Disk Retainer
10 Valve Plug Skirt
11 Seat Ring
12 Pitot Tube
13 Valve Plug System
14* Balancing Diaphragm
15 Sealing Diaphragm Plate
16 Diaphragm Spacer
17 Lower Spring Seat, Types 66 and 66Z only
18* Stem Gasket
19* Bottom Flange Gasket
20 Cap Screw
*Recommended spare part.
2
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