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Instruction Manual
Form 5465
December 2009
Y690VB Series Vacuum Breakers
Introduction
Scope of the Manual
This manual describes and provides instructions
and parts lists for Types Y690VB and Y690VBM
vacuum breakers. Instructions and parts lists for other
equipment used with these breakers are found in
separate manuals.
Product Description
The Y690VB Series vacuum breakers are used for
precise control of small capacity, low-pressure service
applications where an increase in vacuum must be
limited. These direct-operated vacuum breakers come
in NPS 3/4 and 1 (DN 20 and 25) body sizes and
have an 1/4 or 1/2-inch (6,4 or 13 mm) orifice. The
individual products are described as follows:
The Type Y690VB is a vacuum breaker with internal
pressure registration requiring no downstream
control line.
The Type Y690VBM is a vacuum breaker with a
control line connection and a throat seal for external
pressure registration.
Specifications section gives some general ratings
and specifications for the Y690VB Series vacuum
breakers. Individual breakers come from the factory
with the specific data stamped on the nameplate.
Installation
Warning
!
Personal injury, property damage,
equipment damage, or leakage due
to escaping gas or bursting of
W7292
Figure 1. Type Y690VB Vacuum Breaker
pressure-containing parts may result if
this equipment is overpressured or is
installed where service conditions could
exceed the limits given in 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 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 periodically and after any
overpressure condition.
www.fisherregulators.com
Y690VB Series
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Summary of Contents for Fisher Y690VB
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Page 1: Product Description
W7292 Figure 1. Type Y690VB Vacuum Breaker Type Y690VB The Type Y690VB is a vacuum breaker with internal pressure-containing parts may result if pressure registration requiring no downstream this equipment is overpressured or is control line. - Page 2 2. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded. VACUUM VACUUM PUMP BEing LIMITED INLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE POSITIVE PRESSURE OR ATMOSPHERE OR A LESSER VACUUM THAN THE ONE BEING LIMITED B2672 Figure 2. Type Y690VB Operational Schematic...
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Page 3: Principle Of Operation
2. This equipment may be installed in any position All Y690VB Series equipment can be placed in as long as the flow through the body is in the operation by slowly introducing inlet vacuum or direction indicated by the arrow attached to the pressure. - Page 4 Y690VB Series Diaphragm and Spring Case Area Warning These procedures are for gaining access to the To avoid personal injury, property control spring, diaphragm assembly, valve stem, and damage, or equipment damage caused stem O-ring. All pressure must be released from the by sudden release of pressure or diaphragm case before these steps can be performed.
- Page 5 To Convert Constructions diaphragm parts, skip to step 8. Type Y690VB to Type Y690VBM: 4. To replace the lever assembly (key 16), remove the machine screws (key 17). New parts required: keys 30, 31, and 33 5.
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Page 6: Parts List
12 in the Diaphragm and Spring Case Area Stainless steel 17B9723X032 Pusher Post Assembly Maintenance section Stainless steel 17B9742X012 10* Diaphragm Type Y690VBM to Type Y690VB: Nitrile (NBR) 37B9720X012 Fluorocarbon (FKM) 23B0101X052 New parts required: key 27 Body Seal O-Ring Nitrile (NBR) 1H993806992 1. - Page 7 Y690VB Series B2674_2 B2674_1 Figure 3. Type Y690VB Assembly...
- Page 8 For further information visit www.fisherregulators.com The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fisher is a mark owned by Fisher Controls, Inc., a business of Emerson Process Management.
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