Instructions / Assembly

Specifications
Pressure Vacuum Breaker assemblies shall be in stalled to
withstand pressure for long periods and to prevent backflow of
contaminated water into the potable water system in backsi-
phonage conditions. The Pressure Vacuum Breaker assembly
shall consist of a single spring loaded check valve which closes
tightly when water flow through the assembly drops to zero,
and a single air relief valve that opens to break the siphon when
pressure drops to 1psi. The assembly shall include two resilient
seated shut-offs and two resilient seated test cocks, considered
integral to the assembly. Assemblies must be factory backflow
tested. The check valve and air inlet valve must be constructed
to allow in-line servicing of the assembly. The valve body shall
be constructed of bronze. The check, poppet and bonnet
assembly shall be constructed of engineered plastic to protect
the valve body from freeze damage.
Pressure Vacuum Breaker assemblies shall be installed a mini-
mum of 12" (300mm) above the highest downstream outlet, and
the highest point in the downstream piping. The assembly shall
be rated to 150psi working pressure and water temperature
from 32°F to 140°F. The assembly shall meet the specifications
of the USC FCCC & HR Manual.
Pressure Vacuum Breaker assemblies shall be FEBCO Series
765 or prior approved equal.
ES-F-765
Series 765
Pressure Vacuum Breakers
Size:
1
⁄2" - 2"
The FEBCO Series 765 Pressure Vacuum Breakers are
used to protect against health hazard and non-health hazard
backsiphonage conditions in industrial plants, cooling towers
laboratories, laundries, swimming pools and lawn sprinkler
systems.
Features
• All bronze body for durability. One check valve and an air
opening port in one assembly.
• Lightweight poppet seals air opening under minimum flow
conditions.
• Simple service procedures. All internal parts serviceable in line
from the top of the unit.
• Designed for minimum head loss.
• Engineered plastic bonnet protect valve bodies from freeze
damage.
• Optional union end ball valves for easy removal and ultimate
freeze protection.
• End Connections – NPT ANSI/ASME B1.20.1
Operation
The FEBCO 765 PVB is designed to be installed to provide
protection against backsiphonage of toxic or non-toxic liquids.
It consists of a spring loaded check valve which closes tightly
when the pressure in the assembly drops below 1psi or when
zero flow occurs, plus, an air relief valve that opens to break a
siphon when the pressure in the assembly drops to 1psi.
765
765 U
It is illegal to use this product in any plumbing system pro-
viding water for human consumption, such as drinking or
dishwashing, in the United States. Before installing standard
material product, consult your local water authority, building
and plumbing codes.
WARNING
!
The information contained herein is not intended to replace the
full product installation and safety information available or the
experience of a trained product installer. You are required to thor-
oughly read all installation instructions and product safety infor-
mation before beginning the installation of this product.
NOTICE
Job Name
–––––––––––––––––––––––––––––––––––––––––––
Contractor
––––––––––––––––––––––––––––––––––––––––––––
Job Location
–––––––––––––––––––––––––––––––––––––––––
Approval
–––––––––––––––––––––––––––––––––––––––––––––
Engineer
–––––––––––––––––––––––––––––––––––––––––––––
Contractor’s P.O. No.
––––––––––––––––––––––––––––––––––
Approval
–––––––––––––––––––––––––––––––––––––––––––––
Representative
––––––––––––––––––––––––––––––––––––––––
FEBCO product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact FEBCO Technical Service. FEBCO reserves the right to change or modify product design, construction, specifications, or materials with-
out prior notice and without incurring any obligation to make such changes and modifications on FEBCO products previously or subsequently sold.