Series: 765
Description: Pressure Vacuum Breakers
Available Sizes: 1/2 to 2 in. (15 to 50mm)

Series 765 Pressure Vacuum Breakers are designed to be installed to provide protection against back siphonage of toxic or non-toxic liquids. They feature a durable bronze body and a check valve and air opening port in one assembly. Maximum Working Pressure: 150psi (10.3 bar).

Installation Instructions

1. Consult local codes for specific requirements and restrictions applicable

to your area. It is recommended that system supply pressure be at least

20psi (138 kPa).

2. These instructions apply to the FEBCO Series 765 PVB sizes

1⁄2" – 2"

(15 - 50mm) only. The valves may be installed only in the

orientation/flow direction as shown.

3. The Series 765 must be installed where it is accessible for periodic testing

and maintenance. Clearances shown in the installation views apply

to the exterior and interior installations and are only recommendations.

These minimums do not apply to removable protective enclosures.

Refer to local codes for actual requirements in your area.

4.

PRIOR TO INSTALLING THE VALVE INTO THE LINE, FLUSH THE

SUPPLY LINE OF ALL FOREIGN MATERIAL.

Failure to flush the supply

line may cause the check valves to become fouled and require disassembly

and cleaning. The device should be installed where some

spillage is not objectionable, as instantaneous siphon conditions and

pressure surges may cause “spitting”

5. When threading the device inline, place the wrench only on the ball

valve hex ends. Keep pipe dope (sealant) off the interior surfaces of the

valve. After installation fill the assembly with water. Test the valve

assembly to ensure correct operation.

Open the inlet ball valve to pressurize the device. Slowly open the outlet

ball valve to fill the downstream line.

NOTE:

The downstream pressure must be maintained above 5psi (34

kPa) to keep the spring loaded air inlet poppet closed.

NOTE:

All assemblies are tested at the factory for proper operation and

leakage. If the valve does not pass the field test, it is most likely due to

a fouled check valve. This is not covered by the factory warranty. The

valve cover(s) must be removed and the check seats inspected and

cleaned. Any damage or improper operation caused by pipeline debris or

improper installation / start-up is not included in the factory warranty.

In case of a possible warranty claim, contact your local supplier or

FEBCO Representative.

DO NOT REMOVE THE VALVE ASSEMBLY

FROM THE PIPELINE.

6. The assembly must be protected from freezing and excessive pressure

increases. Pressure increases can be caused by thermal expansion or

water hammer. These excessive pressure situations must be eliminated

to protect the valve and system from possible damage.

7. Plastic testcock plugs and tethers are provided (loose in box) for areas

that require them. Refer to FEBCO literature on PVB freeze protection,

“Freeze Protection 765.”