Y690VB Series
D102594X012
Instruction Manual
Form 5465
December 2009
www.fisherregulators.com
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:
Type Y690VB
The Type Y690VB is a vacuum breaker with internal
pressure registration requiring no downstream
control line.
Type Y690VBM
The Type Y690VBM is a vacuum breaker with a
control line connection and a throat seal for external
pressure registration.
Specifications
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
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.
Figure 1. Type Y690VB Vacuum Breaker
W7292
