Where does the anti-siphon valve go?

Quote from the video:
Quote from Youtube video: Just after this connection on the irrigation pipe. You'll find the anti-siphon valve an anti-siphon valve is a combination valve and atmospheric backflow preventor which means it serves two functions.

How high should anti-siphon valves be installed?





These valves prevent the possibility of back siphoning of water from sprinkler lines into the drinking water. The anti-siphon valves must be installed at least 6 inches above the highest sprinkler or elevated piping in the circuit to meet most codes, (See Diagram 1.)( Consult local building code.)

Where should sprinkler valves be placed?

In newer lawn irrigation systems, the valves should be installed in valve boxes set into the earth. Often these are easily visible. In small yards, there is often a single valve box located near where the irrigation pipes enter the ground from the water source.

How do you install an anti-siphon valve for sprinkler system?

Quote from the video:
Quote from Youtube video: System wrap a thin layer of ptfe thread seal tape around the threads of the pipe adapters. And screw them into the valves inlet and outlet tighten the fittings with pliers or channel locks.

Do I need an anti siphon valve on my sprinkler system?

An anti-siphon valve is a very important part of an irrigation system. It performs many functions. As a combination control valve and atmospheric back-flow preventer, it is responsible for holding water under pressure for your sprinkler lines.

Are anti siphon valves required?





Backflow prevention



Federal housing codes require anti-siphoning devices, so most homes come equipped. Plumbing codes require that a functioning anti-siphon faucet or device must cover all hose bib connections. A hose bib is a small faucet or spigot outside, usually where people connect a garden hose.

Do I need backflow preventer with anti-siphon valves?

Anti-siphon valves, usually installed six inches above the ground, do not work well for underground irrigation systems. Requires direct connection with a water source. Backflow preventers (or a check valve) installed upstream to prevent the installation of other anti-siphon valves downstream.

Do anti-siphon valves reduce water pressure?

1 This is where anti-siphon devices are helpful: Anti-siphon devices protect against the possibility of a low water-pressure event in the supply line sucking contaminated water back into the potable water supply or your area’s water supply, potable or otherwise.

What is the difference between an anti-siphon valve and a check valve?

Anti-siphon valve is different from a check valve. Although they are a normally closed valve, they have a very important function and feature that operates differently than most types of valves. They ensure the liquid continues to drain or empty. This can happen when siphoning occurs (Venturi effect).

Where should a backflow preventer be installed?



Install backflow preventers above ground and outside.



This is safest way to protect the property, maintenance personnel and testers, and yourself. To maintain proper protection of the water supply, backflow prevention valves can be installed outside and above grade.

Why is water coming out of my anti-siphon valve?

When an anti-siphon valve leaks, it could be because dirt has gotten into the valve and is preventing the poppet from seating completely when the water is turned on. The problem could also be a worn poppet or rubber gasket.

How much does it cost to install an anti-siphon?

If you need existing piping retrofitted, the labor can cost between $150 and $400.



Backflow Preventer Installation Cost by Type.

Type of Backflow Preventer Cost
Garden Hose or Appliance $3 – $100
Sprinkler or Sewer System $100 – $600
Basement or Floor Drain $150 – $250



How much does a plumber charge to replace an outdoor spigot?

Plumber Cost to Install a New Outdoor Water Spigot



For most small jobs, plumbers charge a flat rate of $100 to $300 which includes both materials and labor. For larger projects that require new pipes, demolition or that might exceed an hour and a half, expect to pay $45 to $65 per hour.

How does a sprinkler anti-siphon valve work?

It incorporates a valve that lets air into the hose to break the siphon effect when water stops flowing, and that keeps flowing water from spilling out of the hose. (Anti-siphon valve assemblies are sometimes referred to as “vented loops” because the valve is typically in a pipe assembly in a loop of hose.)