How to Test an Anti Siphon Valve

What You'll Need
Teflon tape
Pipe sealant
Anti siphon valve

The anti siphon valve is a piece of plumbing equipment used to restrain the entry of debris and other contaminants into the water supply system. It is widely used in lawns and gardens where a sprinkler system has been installed. Once a sprinkler or a hose is used to water the grass on the lawn or the garden, contaminants such as pesticides, dirt, and excrement may get in contact with the water supply and get sucked into the water source.

As a prevention measure against this potential health hazard, most states mandate the installment of this type of valve in the outdoor plumbing. The device is situated on the pump’s outlet to prevent unwanted water drainage. As soon as the valve senses no pressure coming from the water pump, it automatically closes tightly to prevent drainage of water as well as entry of foreign objects into the water source. Sometimes, the valves fail to work due to damage or clogging. To test if the valve is working properly, read the instructions below.

Step 1 – Flush the Entire Sprinkler System

Before working on the valve, turn on the sprinkler system to flush any debris that may have gotten into the sprinklers and the piping. Once the task is done, shut down the water supply.

Step 2 – Detach the Pipe from the Valve

Using a wrench, loosen the fitting on the pipe that is directly connected to the valve and disconnect it.

Step 3 – Detach Sprinkler Head

Detach the sprinkler head and notice if water comes out of the pipe or not. If the water flows from the pipe as the sprinkler head is detached, the valve is not working efficiently and needs to be replaced with a new one. If water doe not flow, the valve is still in perfect condition.

Step 4 – Reattach the Pipe

If the valve is working fine, reattach the pipe. Before fitting the pipe and connecting it to the valve, make sure to apply Teflon tape on the male pipe threads to seal the fitting and avoid water from leaking. Wrap the tape sealant around the threads a few times before cutting the tape. Hand-tighten the connection and use a wrench to tighten it further.

Step 5 – Check for Leaks

Turn on the water supply and the sprinklers. Inspect the plumbing for any signs of leaks. Turn off the sprinkler. If there are leaks on the piping, seal the leaks using pipe sealant.

Step 6 – Install New Valve

If the valve is not working properly, it should be replaced immediately to avoid having the water supply contaminated. Go to the home improvement store and purchase a new anti siphon valve. Install the new valve according to the manufacturer’s instruction. When installing the valve, make sure to turn off the water supply first. After, test the new valve again to check if it is working or not.