Emerson Y696 Installation Guide

Installation Guide
English – May 2002

Type Y696

Introduction

This installation guide provides instructions for
installation, startup, and adjustment. To receive a
copy of the instruction manual, contact your local

Fisher Sales Ofce or Sales Representative or view

a copy at www.emersonprocess.com/regulators. For
further information refer to: Type Y696 Instruction
Manual, form 5312, D101770X012.

Type Y696 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. Categories

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 40 and 50 (1-1/2 and 2-inches) I 1

Specications

Body Sizes and End Connection Styles

DN 40 x 40 or DN 50 x 50 (1-1/2 x 1-1/2 or
2 x 2-inches) NPT

Maximum Inlet and Outlet Pressures

1,0 bar (15 psig)

Proof Test Pressure

All Pressure Retaining Components have been

proof tested per Directive 97/23/EC - Annex 1,
Section 7.4

Outlet Pressure Ranges

(1)

5 to 12 mbar (2 to 5-inches w.c.), 12 to 37 mbar
(5 to 15-inches w.c.), 20 to 69 mbar
(8-inches w.c. to 1 psig), 0,07 to 0,19 bar
(1 to 2.8 psig), 0,14 to 0,24 bar (2 to 3.5 psig),
and 0,3 to 0,5 bar (4 to 7 psig)

Temperature Capabilities

(1)

Nitrile: -29° to 66°C (-20° to 150°F)
Fluoroelastomer: 5° to 149°C (41° to 300°F)

1. The pressure/temperature limits in this installation guide and any applicable
standard or code limitation should not be exceeded.

(1)

Installation

WARNING

!

Only qualied 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 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
Specications section, or where
conditions exceed any ratings of the
adjacent piping or piping connections.

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
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

anged bodies, use suitable line gaskets and

approved piping and bolting practices. Install the
backpressure regulator in any position desired,

unless otherwise specied, but be sure ow

through the body is in the direction indicated by
the arrow on the body.

D101770XENG

R

www.emersonprocess.com/regulators

2

Type Y696

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 trafc 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 inlet pressure, remove the closing
cap or loosen the locknut and turn the adjusting
screw clockwise to increase inlet pressure or
counterclockwise to decrease pressure. Monitor
the inlet 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 backpressure regulator from all
pressure before attempting disassembly.

Parts List

Key Description

1 Control Spring
2 Adjusting Screw
3 Closing Cap
4 Lower Control Spring Seat
5 Diaphragm
6 Lower Diaphragm Plate
7 Diaphragm Plate Gasket
8 Pusher Post
9 Lever Assembly
11 Machine Screw
13 Stem
14 Cotter Pin
16 Body Gasket

17 Split Ring

19 Union Nut
20 Lower Casing
21 Diaphragm Case Cap Screw
22 Hex Nut
23 Spring Case
24 Diaphragm Plate
25 Disk Assembly

27 Orice

28 Body
29 Pipe Plug
30 Diaphragm Cap Screw
35 Closing Cap Gasket
38 Body Cap Assembly
40 Disk Shut-Off Stem
41 Disk Spring
44 Upper Spring Seat
46 Valve Disk Washer
47 Disk Screw
50 Nameplate
51 Drive Screws
75 Bushing
78 Pipe Plug