Emerson Fisher Y696VR Series, Fisher Y696VR, Fisher Y696VRM Instruction Manual

Instruction Manual
D102662X012

January 2019

Y696VR Series Vacuum Regulators

WARNING

!

Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
fire and/or chemical contamination
causing property damage and personal
injury or death.

Fisher™ regulators must be installed,
operated, and maintained in accordance
with federal,state, and local codes,
rules and regulations, and Emerson
Process Management Regulator
Technologies Inc. instructions.

If the regulator vents gas or a leak
develops in the system, service to
the unit may be required. Failure
to correct trouble could result in a
hazardous condition.

Installation, operation, and maintenance
procedures performed by unqualified
personnel may result in improper
adjustment and unsafe operation. Either
condition may result in equipment
damage or personal injury. Use
qualified personnel when installing,
operating, and maintaining the
Y696 Series regulator.

Introduction

Scope of Manual

This manual describes and provides instructions and
parts lists for the Type Y696VR and the Type Y696VRM
vacuum regulators. Instructions and parts lists for
other equipment used with these breakers are found in
separate manuals.

W7431

Figure 1. Type Y696VR Vacuum Regulator

Product Description

The Y696VR Series direct-operated vacuum regulators
are used for precise control of small capacity,
low-pressure service applications where an increase
in vacuum must be limited. They are described
as follows:

Type Y696VR—The Type Y696VR has internal
pressure registration requiring no downstream
control line.

Type Y696VRM—The Type Y696VRM has a control
line connection and an O-ring stem seal blocking the
throat for external pressure registration.

Y696VR Series

Y696VR Series

Specifications

Some general ratings and specifications for the Y696VR Series vacuum regulators are given on page 2. Individual
regulators from the factory are supplied with the specific data stamped on the nameplate.

Body Sizes and End Connection Styles

(1)

See Table 1

Maximum Allowable Emergency Inlet
(Casing) Pressure

(2)

±15 psig / ±1.03 bar

Maximum Allowable Pressure Without Internal
Parts Damage

(2)

±8 psig / ±0.55 bar

Maximum Downstream Pressure

(2)

Full Vacuum

Vacuum Control Pressure Ranges

(2)

See Table 2

Wide-Open Flow Coefficients

Cg: 515
Cv: 14.7
C1: 35

IEC Sizing Coefficients

XT: 0.78;
FD: 0.67;
FL: 0.89

1. End connections for other than U.S. standards can usually be provided; consult the local Sales Ofce.

2. The pressure/temperature limits in this instruction manual and any applicable standard or code limitation should not be exceeded.

Spring Case Connection

3/4 NPT

Control Line Connection

1/2 NPT

Gauge Tap Connection

1/4 NPT

Pressure Registration

Type Y696VR: Internal
Type Y696VRM: External

Material Temperature Capabilities

Nitrile (NBR): -40 to 180°F / -40 to 82°C
Fluorocarbon (FKM): 40 to 300°F / 4 to 149°C
Ethyleneproplyene (EPR): -20 to 275°F /

-29 to 135°C
Perfluoroelastomer (FFKM): 0 to 300°F /

-18 to 149°C

Silicone (VMQ): -40 to 400°F / -40 to 204°C

Approximate Weights

Cast Iron: 45 lbs / 20 kg
Steel, Stainless steel, or Hastelloy® C: 57 lbs /

26 kg

(2)

Table 1. Body Sizes and End Connection Styles

BODY SIZE,

NPS / DN

1-1/2 / 40

2 / 50

1. All anges are welded on to the body and have a face-to-face dimension of 14 in. / 356 mm.

Cast Iron Steel or Stainless Steel Hastelloy

NPT

CONSTRUCTION MATERIAL AND END CONNECTION STYLE

Installation

WARNING

!

Personal injury, property damage,
equipment damage, or leakage due to
escaping gas or bursting of pressure­containing parts may result if this
equipment is overpressured or is
installed where service conditions could
exceed the limits given in specifications,
or where conditions exceed any
ratings of the adjacent piping or piping
connections. To avoid such injury or
damage, provide pressure-relieving or

Hastelloy® C is a mark owned by Haynes International, Inc.

®

C

NPT, SWE, ANSI CL150 RF,

CL300 RF, or PN 16/25/40

ANSI CL150 RF

pressure-limiting devices (as required
by the appropriate code, regulation,
or standard) to prevent service
conditions from exceeding those limits.
Additionally, physical damage to this
equipment could cause personal injury
or property damage due to escaping
gas. To avoid such injury or damage,
install the equipment in a safe and well
ventilated location.

Equipment operation within ratings does not preclude
the possibility of damage from debris in the lines or from
external sources. This equipment should be inspected
for damage after any overpressure condition.

2

Note

If this equipment is shipped mounted on
another unit, install the unit according to
the appropriate instruction manual.

1. Only personnel qualified through training and
experience should install, operate, and maintain
this equipment. For Y696VR Series equipment
that is shipped separately, make sure that there is
no damage to or foreign material in it. Also ensure
that all tubing and piping have been blown free.

2. This equipment may be installed in any position
as long as the flow through the body is in the
direction indicated by the arrow cast on the body. If
continuous operation is required during inspection
or maintenance, install a three-valve bypass around
the equipment.

WARNING

!

This equipment may vent some gas
to the atmosphere. In hazardous or
flammable gas service, vented gas may
accumulate and cause personal injury,
death, or property damage due to fire or
explosion. Vent equipment in hazardous
gas service to a remote, safe location away
from air intakes or any hazardous area.
Protect vent lines and stack openings from
condensation and clogging.

Principle of Operation

A vacuum regulator maintains a constant vacuum at
the regulator inlet. A decrease in vacuum (increase
in absolute pressure) below the setpoint registers
on the diaphragm and opens the disk. This allows
the pressure from the higher vacuum source to pass
through the regulator and restore the vacuum to its
original setting. On the Type Y696VR, the controlled
pressure registers directly into the diaphragm casing.
The Type Y696VRM has a control line connecting the
diaphragm casing to the vacuum being controlled and
an O-ring stem seal blocking the throat allowing for
registration only through the control line connection.

Y696VR Series

VACUUM BEING

CONTROLLED

HIGHER VACUUM SOURCE

VACUUM

PUMP

CONTROL PRESSURE (VACUUM)
OUTLET PRESSURE (VACUUM)
ATMOSPHERIC PRESSURE

Figure 2. Type Y696VR Operational Schematic

Shutdown

To shutdown the unit, close the upstream shutoff valve
and then close the downstream shutoff valve to vent
the equipment properly. Next, open the vent valve
between the equipment and the nearest downstream
shutoff valve. All pressure between the shutoff valves is
released through the open vent valve.

Maintenance

Equipment parts are subject to normal wear and
must be inspected and replaced as necessary. The
frequency of inspection and replacement of parts
depends on the severity of service conditions and
upon applicable codes and government regulations.

WARNING

!

Startup and Adjustment

To place the vacuum regulator in operation, slowly
introduce inlet or vacuum pressure. The unit takes
control when vacuum is established. This unit operates
within the pressure range stamped on the closing cap.

To avoid personal injury, property
damage, or equipment damage caused by
sudden release of pressure or explosion
of accumulated gas, isolate the regulator
and release internal pressure before
attempting maintenance or disassembly.

3