Anti Siphon Valve

ANTI-SIPHON VALVE NOT ABOVE HIGHEST HEAD / NOT LOCATED / LEAKS / AMISS: An anti-siphon valve is a special valve containing a one-way rubber seal which is used to prevent contaminated water from siphoning back into the potable water system. Leaky anti-siphon irrigation valves are usually easy to repair by replacing stem packings or seals or by removing the leaking fitting and replacing or resealing the threads.

Often the valve will be so inexpensive that replacement is best. Parts are usually available at Garden Equipment Outlets and Building Supply Stores. If possible take the offending valve to the store to more easily match needed parts Anti-siphon valves, or devices, should be installed. Usually the type which is installed at the main sprinkler water supply connection is the easiest to retrofit. Be sure that the anti-siphon valve is 6 to 12 inches above the highest sprinkler head, depending on the requirements of your municipality. On hillsides this may require piping the sprinkler water supply line to the top of the hill (or highest point of the irrigated areas) since many sprinkler heads would be below the anti-siphon valve.

Installation of a single main anti-siphon valve which would supply water to all station supply valves, would provide back flow protection to any sprinklers below More level properties may only require the anti-siphon valves to be raised on pipe extensions Leaky anti-siphon valves should be repaired or replaced as soon as possible The materials needed to install and/or repair these valves are readily available at most Lumber Yard and Home Improvement Stores If you need assistance call on the services of a Landscape Contractor Be aware that an anti-siphon valve may be present but not apparent to the inspector, if "not located ' has been indicated.

The above information was provided by TWI Systems Copyright 1995-2005 1-800-553-5660

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File last updated February 08, 2012 * Copyright © 2012 All rights reserved by: Accurate Inspections, Inc. A New Jersey home inspection firm 56 Woodland Drive, Woodland Park (formerly West Paterson) NJ 07424 973-812-5100 providing New Jersey Certified Home Inspections in NJ, by New Jersey Licensed home inspectors. Inspector of record Michael Del Greco, New Jersey Home Inspector License GI 0121.

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