FEB Series 765 Original operating manual

ES-F-765

SPECIFICATION SHEET

FEBCO product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise mea-

surements, please contact FEBCO. FEBCO reserves the right to change or modify product design, construction, specifications, or materials

without prior notice and without incurring any obligation to make such changes and modifications on FEBCO products previously or subse-

quently sold.

Job Name ––––––––––––––––––––––––––––––––––––––––––– Contractor

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Job Location ––––––––––––––––––––––––––––––––––––––––– Approval

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Engineer –––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No. ––––––––––––––––––––––––––––––––––

Approval –––––––––––––––––––––––––––––––––––––––––––– Representative

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Series 765

Pressure Vacuum Breakers

Size: 1⁄2" - 2" (15mm - 50mm)

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.

Specifications

Pressure Vacuum Breaker assemblies shall be installed to withstand

pressure for long periods and to prevent backflow of contaminated water

into the potable water system in backsiphonage 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, pop-

pet 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 minimum 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.

Approvals – Standards

• Approved by the Foundation for Cross-Connection Control and Hydraulic

Research at the University of Southern California.

Applications

PVB assemblies are used to protect against health hazard and non-health

hazard backsiphonage conditions in industrial plants, cooling towers labora-

tories, laundries, swimming pools and lawn sprinkler systems.

Typical Installation

Pressure Vacuum Breaker assemblies should be installed at least

12" (300mm) above the highest piping and outlet downstream of the

assembly to preclude backpressure. Assemblies should be installed so

they are easily accessible for maintenance, periodic testing, and where dis-

charge will not be objectionable. They should be protected from freezing. If

the assemblies are subject to freezing temperatures, the freeze protection

procedures outlined in "Service Instruction Freeze Protection Model 765"

must be followed. Assemblies must not be installed where backpressure

could occur.

The discharge pressure shall be maintained above 3.0psi on

1⁄2" - 11⁄4" (15 - 32mm) sizes and 5.0psi on 11⁄2"- 2" (40 - 50mm) sizes to

insure seating of the spring loaded air inlet poppet.

Thermal water expansion and/or water hammer down stream of the back-

flow preventer can cause pressure increases. Excessive pressure should

be eliminated to avoid possible damage to the system and assembly.

765

12" (300mm) above the highest downstream

outlet and the highest point in

the downstream piping

Flow

1020 B64.1.2

SIZE (DN) DIMENSIONS WEIGHT

A A1 (union) B B1 (union) C D D1 (union) E E1 (union)

in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs.

1⁄215 61⁄4159 7 178 63⁄4172 71⁄2197 21⁄264 33⁄495 41⁄211 4 4 1⁄4108 5 127 2.6 1.2

3⁄420 61⁄2165 73⁄8187 7 178 77⁄8200 21⁄264 4 102 47⁄8124 41⁄2114 5 3⁄8137 2.9 1.3

1258

3⁄4222 95⁄8245 9 229 915⁄16 252 4 102 51⁄4133 63⁄16 15761526

15⁄16 176 5.9 2.7

1⁄432 91⁄4235 101⁄4260 10 254 11 279 4 102 61⁄4159 71⁄4184 7 178 8 203 7.0 3.2

1⁄240 113⁄4299 127⁄8327 11

1⁄2292 125⁄8321 61⁄2165 71⁄4184 83⁄8213 73⁄4197 83⁄4225 14.8 6.7

25012

1⁄2318 133⁄4349 121⁄4311 131⁄2343 61⁄2165 8 203 91⁄4235 81⁄2216 93⁄4248 16.5 7.5

Note: Weights shown do not include union end ball valves and are approximate. Dimensions shown are nominal, allowance must be made for normal manufacturing tolerances.

Dimensions – Weights

Size: 1⁄2" - 2" (15 - 50mm)

Pressure – Temperature

Max. Working Pressure: 150psi (10.3 bar)

Hydrostatic Test Press: 300psi (20.7 bar)

Temperature Range: 32°F to 140°F (0°C to 60°C)

Materials

Main Valve Body: Bronze

Elastomers: Nitrile

Models

• Union End Ball Valves

• Bronze Bonnet, 1" & 11⁄4" (25 & 32mm)

Capacity

3⁄4" (20mm)

kPa psi

103 15

69 10

34 5

0 0

HEADLOSS

1⁄2" (15mm)

kPa psi

103 15

69 10

34 5

0 0

0 2 4 6 8 10 12 gpm

0 8 15 23 30 38 45 lpm

5 7.5 10 fps

1.5 2.3 3.1 mps

HEADLOSS

0 5 10 15 20 25 30 gpm

0 19 38 57 76 95 114 lpm

5 7.5 10 15 fps

1.5 2.3 3.1 4.6 mps

1" (25mm)

kPa psi

103 15

69 10

34 5

0 0

HEADLOSS

0 10 20 30 40 50 60 gpm

0 38 76 114 151 190 227 lpm

5 7.5 10 15 20 fps

1.5 2.3 3.1 4.6 6.1 mps

11⁄4" (32mm)

kPa psi

103 15

69 10

34 5

0 0

0 20 40 60 80 gpm

0 76 151 227 304 lpm

5 7.5 10 15 fps

1.5 2.3 3.1 4.6 mps

HEADLOSS

11⁄2" (40mm)

kPa psi

103 15

69 10

34 5

0 0

HEADLOSS

0 20 40 60 80 100 120 gpm

0 76 151 227 304 379 454 lpm

5 7.5 10 15 fps

1.5 2.3 3.1 4.6 mps

2" (50mm)

kPa psi

103 15

69 10

34 5

0 0

HEADLOSS

0 40 80 120 160 gpm

0 151 304 454 606 lpm

5 7.5 10 15 fps

1.5 2.3 3.1 4.6 mps

A Division of Watts Water Technologies, Inc. USA: 3816 S. Willow Ave. • Fresno, CA • 93725 • Tel. (559) 441-5300 • Fax: (559) 441-5301 • www.FEBCOonline.com