Febco FE765-075 PVB Assembly Sprinkler Systems Irrigation System

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FE765-075 - Febco 3/4" PVB Assembly

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Product Code: FE765-075

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Description

Product Manuals

FEBCO
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FEBCO Pressure Vacuum Breaker Assembly

Primary Application

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WARNING! Irrigation systems supplied by domestic or private potable water systems are considered to be a potential pollution hazard to the water supply. These systems must include protection to prevent possible backflow of irrigation water into the potable water supply.

Federal law requires a proper backflow device to be installed on any watering system to prevent contamination of the supply, whether it be pump or city water. Check your local water authority for installation requirements & codes. In many rural areas, specific requirements for landscape irrigation systems may not be covered in local plumbing codes and/or enforcement may be limited. HOWEVER...limitation in local authority does not alter the basic requirement for protection of the potable water supply.

This device is used in irrigation and commercial and industrial piping systems to prevent back-siphonage in piping under continuously pressurized systems.

All brass construction. Ball type control valves and test cocks. Durable, reliable plastic bonnet/poppet internal mechanism. Includes shut off valves on the inlet and discharge side of the vacuum breaker and small test cocks. Valves and test cocks are primarily for field testing. The vacuum breaker consists of a spring loaded check valve and an inlet port that opens should a back-siphonage condition occur in the potable supply piping.

PVB's must be installed such that the water supply to the sprinkler system goes through the PVB before supplying the sprinkler system valves. Furthermore, the device must be installed at least 12 inches or more above the highest sprinkler head or shrub riser.

PVB - Pressure Vacuum Breaker assemblies 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.

Febco 765 Pressure Vacuum Breaker assemblies should be installed at least 12 inches above the highest piping outlet and downstream of the assembly to preclude backpressure. In a sprinkler system that means the Febco 765 Pressure Vacuum Breaker must be installed 12 inches above the highest head in the irrigation system.

Febco 765 PVB assemblies should be installed so they are easily accessible for maintenance, periodic testing, and where discharge will not be objectionable. They should be protected from freezing. If the assemblies are subject to freezing temperatures, the freeze protection procedures outlines in the service manual that is included with the Febco 765 Pressure Vacuum Breaker must be followed. Assemblies must not be installed where backpressure could occur.

The discharge pressure of the Febco 765 pressure vacuum breaker shall be maintained above 3.0 PSI on 1/2 in though 1 1/4 in sizes and 5.0 PSI on 1 1/2in and 2 in sizes to insure seating of the spring loaded air inlet poppet.

Thermal expansion of water and / or water hammer down stream of the backflow presenter can cause pressure increases. Excessive pressure should be eliminated to avoid possible damage to the system and assembly.

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 1 PSI.

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 damage in the event of freezing.

Pressure Vacuum Breaker assemblies shall be installed a minimum of 12 inches above the highest downstream outlet, and the highest point in the downstream piping. The assembly shall be rated to 150 PSI working pressure and water temperature from 32 degrees F. to 140 degrees F. The assembly shall meet the specifications of the USC* approval.

Pressure Vacuum Breaker shall be Febco 765 or prior approved equal.