Installation Guide
English – May 2002
Y695A 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 Ofce or Sales Representative or view
a copy at www.emersonprocess.com/regulators. For
further information refer to: Y695A Series Instruction
Manual (form 5466, D102596X012).
The y695A Series vapor recovery regulators
are used to maintain a constant inlet (blanket)
pressure with the outlet owing to a system
whose pressure is lower than that at the inlet.
P.E.D. Category
This product may be used as a pressure 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.
PRoDuCT SIzE CATEgoRIES FluID TyPE
DN 20 to 25 (3/4-inch to 1-inch) SEP 1
Maximum Emergency Inlet Pressure to Avoid
Internal Parts Damage
(1)
10,3 bar (150 psig)
Control Pressure Ranges
(1)
Relief Set Pressure Range
5 to 16 mbar* (2 to 7-inches w.c.),
7 to 33 mbar* (3 to13-inches w.c.),
25 to 65 mbar (10 to 26-inches w.c.),
62 to 172 mbar (0.9 to 2.5 psig),
0,09 to 0,31 bar (1.3 to 4.5 psig), and
0,26 to 0,48 bar (3.8 to 7 psig)
Proof Test Pressure
All Pressure Retaining Components have been
proof tested per Directive 97/23/EC - Annex 1,
Section 7.4
Temperature Capabilities
(1)
Nitrile: -29° to 82°C (-20° to 180°F)
Fluoroelastomer (FKM): 4° to 149°C
(40° to 300°F)
Peruoroelastomer (FFKM): -29° to 149°C
(-20° to 300°F)
Ethylenepropylene (EPDM): -29° to 149°C
(-20° to 300°F)
Specications
Available Constructions
Type y695A: The Type Y695A has internal
registration requiring no downstream control line.
Type y695AM: The Type Y695AM has a blocked
throat and a downstream control line connection
for external registration.
Body Sizes
DN 20 or 25 (3/4-inch or 1-inch)
End Connection Styles
Ductile Iron: NPT
CF8M Stainless steel: NPT, ANSI Class 150 RF,
ANSI Class 300 RF, PN 16/25/40
CF8M Stainless steel with Carbon steel
anges: ANSI Class 150 RF, ANSI Class
300 RF, PN 16/25/40
Hastelloy C: ANSI Class 150 RF
Maximum Inlet and outlet Pressures
10,3 bar (150 psig)
*Spring ranges based on spring case installed pointed down. When installed pointing
up, the spring ranges increase by 5 mbar (2-inches w.c.). Do not use uoroelastomer
(FKM) diaphragm with these springs at diaphragm temperatures lower than 16°C (60°F).
1. The pressure/temperature limits in this installation guide and any applicable standard
or code limitation should not be exceeded.
2. All anges are welded on except Hastelloy C. All ange dimensions are 356 mm
(14-inches) face-to-face.
(2)
(1)
Installation
WARNINg
!
Only qualied personnel should install
or service a backpressure regulator.
Backpressure regulators should be
installed, operated, and maintained
in accordance with international and
applicable codes and regulations, and
Fisher instructions.
If the backpressure regulator vents
uid or a leak develops in the system,
it indicates that service is required.
Failure to take the backpressure
regulator out of service immediately
may create a hazardous condition.
Personal injury, equipment damage,
or leakage due to escaping uid
or bursting of pressure-containing
parts may result if this backpressure
regulator is overpressured or is
installed where service conditions
could exceed the limits given in the
Specications section, or where
conditions exceed any ratings of the
adjacent piping or piping connections.
D102596XENG
R
www.emersonprocess.com/regulators
Y695A Series
To avoid such injury or damage,
provide pressure-relieving or pressurelimiting devices (as required by
the appropriate code, regulation,
or standard) to prevent service
conditions from exceeding limits.
Additionally, physical damage to
the backpressure regulator could
result in personal injury and property
damage due to escaping fluid. To
avoid such injury and damage, install
the backpressure regulator in a
safe location.
Clean out all pipelines before installation of the
backpressure regulator and check to be sure the
backpressure regulator has not been damaged or
has collected foreign material during shipping. For
NPT bodies, apply pipe compound to the male
pipe threads. For anged bodies, use suitable line
gaskets and approved piping and bolting practices.
Install the backpressure regulator in any position
desired, unless otherwise specied, but be sure ow
through the body is in the direction indicated by the
arrow on the body.
Note
It is important that the backpressure
regulator be installed so that the
vent hole in the spring case is
unobstructed at all times. For outdoor
installations, the backpressure
regulator should be located away
from vehicular trafc and positioned
so that water, ice, and other foreign
materials cannot enter the spring case
through the vent. Avoid placing the
backpressure regulator beneath eaves
or downspouts, and be sure it is above
the probable snow level.
overpressure Protection
Maximum inlet pressures depend upon body
materials and temperatures. Refer to the nameplate
for the maximum inlet pressure of the valve. The
valve should be inspected for damage after any
overpressure condition. Fisher backpressure
regulators are NoT ASME safety relief valves.
Startup
The backpressure 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
!
T o avoid personal injury resulting from
sudden release of pressure, isolate
the backpressure regulator from all
pressure before attempting disassembly .
Parts list
Key Description
1 Body
2 Cap Screw
3 Spring Case Assembly
4 Diaphragm Casing
5 Orice
6 Spring
7 Diaphragm Head
8 Pusher Post
10 Diaphragm
11 Body Seal O-Ring
12 Insert Seal
13 Disk Assembly
14 Stem
16 Lever Assembly
17 Machine Screw
18 Guide Insert
22 Closing Cap
23 Hex Nut
24 Cap Screw
25 Closing Cap Gasket (Steel and Stainless steel Closing Cap only)
26 Vent Assembly
27 Pipe Plug
30 Stem Seal (Type Y695AM only)
31 Throat Seal (Type Y695AM only)
33 Machine Screw (Type Y695AM only)
35 Adjusting Screw
36 Washer
38 Cap Screw
41 Back Disk Spring
42 Back Body Seal
43 Back Body Cap
44 Disk Spacer
45 Diaphragm Head Gasket
46 Nameplate
47 Drive Screw
49 Backup Ring
50 Lower Spring Seat
2
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