Emerson Y690A Installation Guide
Installation Guide
English – May 2002
Y690A Series
Introduction
This installation guide provides instructions for installation,
startup, and adjustment. To receive a copy of the instruction
manual, contact your local Fisher Sales
Office or Sales Representative or view a copy at
www.FISHERregulators.com. For further information refer to:
Y690A Series Instruction Manual (form 5463,
D102587X012).
P.E.D. Category
This product may be used as a safety accessory with
pressure equipment in the following Pressure Equipment
Directive 97/23/EC categories. It may also be used outside of the Pressure Equipment Directive using sound
engineering practice (SEP) per table below.
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Specifications
Available Configurations
Type Y690A: Low-pressure, 2 to 17 mbar (1 to 7-inches
w.c.), direct-operated regulator with internal registration
requiring no downstream control line.
Type Y690AH: Low-pressure, 12 to 480 mbar (5-in. w.c. to
7 psig), direct-operated regulator with internal registration
requiring no downstream control line.
Type Y690AM: Low-pressure, 2 to 17 mbar (1 to 7-inches
w.c.), direct operated regulator with a blocked throat and
O- ring stem seal for use if external registration is required.
Lower diaphragm casing assembly is tapped for 12,7 mm
(1/2-inch) NPT for downstream control line connection.
Type Y690AHM: Low-pressure, 12 to 480 mbar (5-inches
w.c. to 7 psig), direct-operated regulator with a blocked
throat and O-ring stem seal for use when external
registration is required. Lower diaphragm casing assembly
is tapped for 12,7 mm (1/2-inch) NPT for downstream control
line connection.
Body Sizes
DN 20 or 25 (3/4 or 1-inch)
Body Material and End Connection Styles
Ductile Iron: NPT
Stainless Steel with Stainless Steel Flanges: NPT,
ANSI Class 150 RF, ANSI Class 300 RF, and PN 16/25/40
Stainless Steel with Carbon Steel Flanges: ANSI
Class 150 RF, ANSI Class 300 RF, and PN 16/25/40
Hastelloy C: ANSI Class 150 RF
Maximum Allowable Inlet Pressure
10,3 bar (150 psig)
Maximum Operating Inlet Pressure
See table 1
Maximum Outlet (Casing) Pressure
10,3 bar (150 psig)
Maximum Emergency Outlet Pressure to Avoid Internal
Parts Damage
10,3 bar (150 psig)
(1)
(1)
(1)
(1)
Outlet Pressure Ranges
See table 1
Proof Test Pressure
All Pressure Retaining Components have been proof tested
per Directive 97/23/EC - Annex 1, Section 7.4
Temperature Capabilities
Nitrile (NBR):
Fluoroelastomer (FKM):
Ethylenepropylene (EPDM):
Perfluoroelastomer (FFKM):
-29 to 82°C (-20 to 180°F)
(1)
(1)
4 to 149°C (40 to 300°F)
-29 to 149°C (-20 to 300°F)
-20 to 300°F (-29 to 149°C)
Installation
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 Fisher 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.
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 pressurerelieving 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 male 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.
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.
1. The pressure/temperature limits in this installation guide and any applicable
standard or code limitation should not be exceeded.
www.FISHERregulators.com
D102587XENG
Y690A Series
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)
To avoid personal injury resulting from sudden
release of pressure, isolate the regulator from all
pressure before attempting disassembly.
Table 1. Maximum Operating Inlet Pressure and Outlet Pressure Ranges
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Parts List
Key Description
1 Body
2 Cap Screw
3 Spring Case Assembly
4 Diaphragm Casing
5 Orifice
6 Spring
7 Diaphragm Head
8 Pusher Post
10 Diaphragm
11 Body Seal O-Ring
12 Insert Seal
13 Disk Assembly
14 Stem
15 Cotter Pin
16 Lever Assembly
17 Machine Screw
18 Guide Insert
21 Hex Nut
22 Closing Cap
Key Description
23 Hex Nut
24 Diaphragm Case Screw
25 Closing Cap Gasket
26 Vent Assembly
27 Pipe Plug
30 Stem Seal
31 Throat Seal
32 Pitot Tube
33 Machine Screw
35 Adjusting Screw
37 Spring Holder
38 Machine Screw
39 Overpressure Spring
40 Pusher Post Connector
46 Nameplate
47 Drive Screw
48 Post Seal
49 Connector Seal
50 Backup Ring
B2630
Figure 1. Type Y690Am or Y690AHM Regulator Assembly
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