Y692VB Series
D102661X012
Instruction Manual
Form 5479
January 2010
www.fisherregulators.com
Y692VB Series Vacuum Breakers
Introduction
Scope of the Manual
This manual provides instructions and a parts list
for Types Y692VB and Y692VBM vacuum breakers.
Instructions and parts lists for other equipment used
with these breakers are found in separate manuals.
Product Description
The Y692VB 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 1-1/2 and 2 (DN 40 and 50) body sizes and
have a 3/4 or 1-3/16-inch (19 or 30 mm) orifice and
a 3/4-inch (19 mm) spring case vent connection with
optional umbrella vent assembly. The products are
described as follows:
Type Y692VB—
Type Y692VB has internal pressure
registration, so it does not require a control line.
Type Y692VBM—
Type Y692VBM has a control line
connection and an O-ring stem seal to block the throat
for external pressure registration.
Specifications
Some general ratings and specifications for the
Y692VB Series vacuum breakers are given on page 2.
Individual vacuum 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 pressure-
containing parts may result if this
equipment is overpressured or is
installed where service conditions
could exceed the limits given in the
Specifications, 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.
W7429
Figure 1. Type Y692VB Vacuum Breaker
