Specifications

ManualsBrandsToro ManualsValvesToro Air Release Valves

Micro-Irrigation

Air/Vacuum Valves

Air and vacuum control is essential to the safety,

longevity, efficiency, and performance of an

irrigation system. Air must be allowed to exit

pipelines 1) upon startup to prevent water

hammer, 2) during normal operation to prevent

the development of air pockets, and 3) air must be

allowed to enter pipelines and laterals at shut down

to prevent vacuum suction. Various types of valves

and vents are available to perform these functions.

Application:

Removal of Air from Pipelines

• Avoid Water Hammer: Air must be allowed

to escape pipelines at the same rate as water

enters the pipeline during system startup to

avoid dangerous water hammer from

occurring.

• Remove entrained or dissolved air:

Air that has accumulated at high points

during system operation must be allowed to

escape to avoid air pockets which restrict the

flow of water and can cause water hammer.

Allow the Entry of Air into Pipelines

• Prevent Vacuum Suction in Pipelines:

Air must be allowed to re-enter main and

submain pipelines as water drains during

system shut down to prevent negative

suction from occurring and potential

collapse of the pipelines.

• Prevent Vacuum Suction in Laterals:

Laterals which are buried or submerged in

water may ingest dirty water and/or soil

through the emitters as a result of vacuum

suction if air is not allowed to enter the

laterals during system shut-down and

drainage.

Plastic

Air Vent

1/2"

Vacuum

Breaker

1" & 2"

Continuous

Acting Air

Release

Valves

1" & 2"

Air

Release

and

Vacuum

Relief

Valves

2", 3" & 4" Aluminum Air Vents

Summary of content (6 pages)

PAGE 1
Air/Vacuum Valves Micro-Irrigation Air and vacuum control is essential to the safety, longevity, efficiency, and performance of an irrigation system. Air must be allowed to exit pipelines 1) upon startup to prevent water hammer, 2) during normal operation to prevent the development of air pockets, and 3) air must be allowed to enter pipelines and laterals at shut down to prevent vacuum suction. Various types of valves and vents are available to perform these functions.
PAGE 2
Continuous Acting Air Release Valves 1" & 2" Combination Large Volume Air Relief and Continuous Acting Air Release & Vacuum Relief Valve • Install at highest points on filter and pump stations to provide both instantaneous and continuous air relief • Install on main manifolds every 1000 feet to introduce air into the irrigation system at shutdown to prevent pipe collapse • Install at highest point of slope to provide vacuum relief at system shutdown Model #ARV-1-A Model #ARV-2-KA Specifications Part Numb
PAGE 3
Air Release and Vacuum Relief Valves 1" & 2" Air Release & Vacuum Relief Valves • Install on manifolds to exhaust air at system start-up • Install on manifolds to introduce air into the pipeline and provide vacuum relief after system shutdown • Install downstream of valves to introduce air into the pipeline and provide vacuum relief after valve shutdown • Install at highest point of slope to introduce air into the pipeline and provide vacuum relief after valve shutdown Model #ARV-1-K Model #ARV-2-K Speci
PAGE 4
Aluminum Air Vents Application: Air Intake Flow Chart Hg The Aluminum Air Vent series can be used on gravity or higher pressure systems, allowing for operation up to 150 psi on the 2" model and 100 psi on 3" and 4" models. The float and precision ORing provide a tight seal at a very low pressure, while the strong aluminum alloy body and full baffle allow for maximum vent capacity without premature closing.
PAGE 5
1/2" Vacuum Breaker Application: The 1/2" Air & Vacuum Relief Valve (ARV) is specifically designed to prevent soil ingestion of emitters from back siphoning. Closed Air Intake Flow Chart Vacuum Breaker (ARV) 1 /2 " Negative Pressure (bar) – 0.4 – 0.3 – 0.2 – 0.1 Open Model #YD-500-34 20 40 Note: 1 bar = 14.
PAGE 6
Installation* The simplest method for selecting the proper size of air/vacuum relief valves is called the "four-to-one" rule. This rule specifies that the clear opening diameter of the air/vacuum relief valve be no less than 1/4 the inner diameter of the pipe. Thus, for an 8-inch pipe, the air/vacuum relief valve should have a clear opening diameter of no less than 2 inches.** 1 Air vents (vacuum relief) should be installed downstream of all shut-off valves.