Backflow Prevention Experts

  • Has your Water District requested a backflow test or installation?
  • Is your Backflow Device leaking?
  • Need to secure your backflow in an enclosure?

We are approved by your local Water District for backflow inspections and can provide you with certification within the same day. We are Certified in all Cities within San Diego, Riverside, San Bernardino, Orange and Los Angeles Counties. Call us now! 866-375-3569

  • All Sizes From 1/2″-10″ Units
  • All Makes & Models
  • Backflow Repairs/Maintenance
  • Backflow Installations
  • Backflow Testing/Troubleshooting
  • Backflow Certifications
  • Backflow Theft Protection
  • Gate Valve repacking
  • Multiple Commercial Testing
  • City Buildings and Recreation Parks
  • 24/7 Service and Reasonable rates, highly recommended by your Local Water district (referrals upon request)

“LAND OF THE LEAD FREE”- Make sure your contractor uses lead free materials and rubbers.

American Plumbing, Backflow, Heating and Air is taking part in protecting our customer’s water quality and distribution system. American Backflow has been specializing in the backflow prevention industry for over 15 consecutive years and is determined provide the best service possible to our commercial and residential customers at reasonable rates.

We work with all City approved Backflow Prevention devices in today’s market. Our trucks are stocked with the most popular backflow parts, so we are always ready to complete repairs and certify your unit as efficient as possible.

STOP BACKFLOW DEVICE THEFT

At American Plumbing & Backflow Prevention, we want you to know that you are not limited to big backflow cages. We are concerned about your Backflow device investment(s) and we recommend several ways to prevent unit theft. Talk to one of our technicians about cable guards, valve guards, maximum guards and other forms of protection.

Protect your Backflow investment(s) with Backflow Valve Guards. Whether there is an existing concrete pad or not, we can recommend and offer protection solutions.

2″ Backflow Prevention Cage in combination with a 2″ Cable Guard.

REPACKING AN OS&Y GATE VALVE

Replacing a leaky 10″ or even a 8″ OS&Y gate valve can cost you big bucks, so it’s always a good idea to repack the valve.  Your American Backflow Specialist can repair or replace your leaky valve.

You can immediately tell when an OS&Y valve is opened or closed, the stem goes up or down as you turn the hand wheel. As the stem wears out the packing rope, the leak gets greater and eventually you end up calling a repair technician. Non rising stem (NRS) valve don’t have this problem as often because they have an internally sealed stem which stay in the same vertical position whether the valve is open or closed.

American Backflow has the knowledge and experience necessary to repair up to 10″ OS&Y valves, we have been serving your business community for the past 15+ years. Just call 866-375-3569 to make an appointment or for any questions you may have.

BACKFLOW PREVENTION GLOSSARY

Absolute pressure - Pressure measured on a scale where a perfect vacuum is zero. Absolute pressure is the sum of gage pressure and stmospheric pressure.

Air gap – A physical separation between the free flowing discharge end of a potable water supply pipeline and an open or non-pressure receiving vessel. Air gap should be at least twice the diameter of the supply pipe measured vertically above the overflow rim of the receiving vessel; in no case less than one inch.

Approved backflow prevention assembly – An assembly that has been investigated and approved by the administrative authority having jurisdiction.

Approved check valve – A check valve that is drip-tight in the normal direction of flow when the inlet pressure is at least 1.0 psi and the outlet pressure is zero. The check valve should not permit no leakage in a direction reverse  to the normal flow.

Aspirator – A device used for creating suction, specifically by flowing water through a venturi or constricted area of flow. At this restricted area of flow the pressure drops to sub-atmospheric, thus suction is created.

Atmospheric pressure – The pressure exerted by the atmosphere on a surface. At sea level the atmospheric pressure is 14.7 psi.

Atmospheric vacuum breaker backsiphonage prevention assembly (AVB) – An assembly containing an air inlet valve, a check seat and an air inlet port(s).

Auxiliary water supply – Any water supply on or available to the premises other than the water purveyor’s approved public potable water supply. They may include water from another water purveyor, natural source such as a well, spring, river, stream, harbor, etc.

Backflow – The undesirable reversal of flow of water or mixtures of water and other liquids, gases or other substances into the distribution pipes of the potable supply of water from any source or sources.

Backpressure – Any elevation of pressure in the downstream piping system above the supply pressure at the point of consideration, which would cause or tend to cause a reversal of the normal direction of flow.

Backsiphonage – A form of backflow due to a reduction in system pressure, which causes a sub-atmospheric pressure to exist in the water system.

Certified backflow prevention assembly tester – A person who has proven ability in field testing backflow prevention assemblies to the satisfaction of the administrative authority having jurisdiction, either directly or through a third party certification program.

Contaminant – Any substance that shall impair the quality of water, in such a way as to create an actual hazard to the public health through poisoning, the spread of disease, etc.

Critical level – The minimum elevation above the flood level rim of the fixture or receptacle served, downstream piping and water uses on atmospheric vacuum breakers, pressure vacuum breakers, spill-resistant vacuum breakers, at which the unit may be installed. Indicated with a C.L. marking.

Cross-Connection – Any actual or potential connection or structural arrangement between a public or a consumer’s potable water system and any other source or system through which it is possible to introduce into any part of the potable system any used water, industrial fluid gas, gas, or substance other than the intended potable water with which the system is supplied.

Degree of hazard – Either a pollutant or contaminant; derived from the assessment of the materials, which may come in contact with the distribution system through a cross-connection.

Double check valve backflow prevention assembly (DC) – An assembly composed  of two independently acting, approved check valves, including tightly closing resilient seated shut off valves attached at each end of the assembly and fitted with properly located resilient seated test cocks. This type of assembly can only be used against non-health hazard circumstances.

Double check detector backflow prevention assembly (DCDA) – A specially designed assembly composed of a line-size approved double check valve assembly with a bypass containing a specific water meter and an approved double check valve assembly. The meter shall register accurately for rates of flow up to 2 gpm and shall show a registration for all rates of flow.

Internal protection – The appropriate type or method of backflow protection within the consumer’s potable water system at the point of use, commensurate with the degree of hazard.

Parallel installation – Two or more backflow prevention assemblies of the same type installed in parallel, that is having a common inlet, outlet and direction of flow.

Plumbing hazard – An internal or plumbing type cross connection in a consumer’s potable water system with either a pollutant or contaminant.

Pollution – An impairment of the quality of the water to a degree which does not create a hazard to the public health but which does adversely and unreasonably affect the aesthetic qualities of such waters for domestic use.

Potable water – Water from any source that has been investigated by the health agency having jurisdiction, and which has been approved for human consumption.

Pressure – A uniform force applied over a surface, measured as a force per unit area. Typically water pressure is measured in pounds per square inch or psi.

Pressure fluctuation – The changes of pressure within a system.

Pressure vacuum breaker backsiphonage prevention assembly (PVB) – An assembly containing an independently operating internally loaded check valve and an independently operating loaded air inlet valve located on the discharged side of the check valve. The assembly is to be equipped with properly located resilient seated test cocks and tightly closing resilient seated shut off valves attached at each end of the assembly.

Public potable water system – Any publicly or privately owned water system operated as a public utility under a valid health permit to supply water for domestic purposes.

Reclaimed water – Water which, as a result of treatment of wastewater, is suitable for a direct beneficial use or a controlled use that would not otherwise occur. Reclaimed water is not safe for human consumption.

Reduced pressure principle backflow prevention assembly (RP) – An assembly containing two independently acting approved check valves together with a hydraulically operating, mechanically independent pressure differential relief valve located between the check valves and at the same time below the first check valve. The unit shall include properly located resilient seated test cocks and tightly closing resilient seated shutoff valves at each end of the assembly.

Reduced Pressure principle detector backflow prevention assembly (RPDA) – A specially designed assembly composed  of a line-size approved reduced pressure principle backflow prevention assembly with a specific bypass containing a specific water meter and an approved reduced pressure principle backflow prevention assembly. The meter shall register accurately for rates of flow up to 2 gpm and shall show a registration for all rates of flow.

Service connection – The terminal end of a service connection from the public water system. If a water meter is installed at the end of the service connection, then the service connection shall mean the downstream end of the water meter.

Service protection – The appropriate type or method of backflow protection at the service connection, commensurate with the degree of hazard of the consumer’s potable water system.

Spill-resistant pressure vacuum breaker backsiphonage prevention assembly (SVB) – An assembly containing an independently operating internally loaded check valve and independently operating loaded air inlet valve located on the discharged side of the check valve. The assembly is to be equipped with a properly resilient seated test cock, a properly located bleed/vent port, and tightly closing resilient seated shutoff valves attached at each end of the assembly. This assembly is designed to protect against a non-health hazard under a backsiphonage condition only.

Thermal expansion – The resulting effect when water in a closed system, such as piping system downstream of a backflow preventer heats up. In effect, the heat causes the water volume to expand, but since the system is closed, the pressure increases.

Water supplier – The public or private owner or operator of the potable water system supplying an approved water supply to the public.