Air Valves
Dezurik carries a full line of APCO air valves ranging from clean water air release to wastewater combination.
All valves are available to meet American Iron and Steel requirements and have a long history of dependable service.
Tek-Sales performs air valve sizing regularly for many projects and can provide a full report at no cost.
CLEAN WATER APPLICATIONS
The APCO Clean Water Air Release Valves (ARV) function to release air pockets that collect at each high point of a pressured pipeline, and are essential for pipeline efficiency and water hammer protection. Air Release Valves are available in a wide variety of orifice sizes and materials of construction to meet a wide range of applications.
Air/Vacuum Valves are float operated and have a large discharge orifice equal in size to the valve’s inlet. Air/Vacuum valves allow large volumes of air to be exhausted from or admitted into a pipeline as it is being filled or drained. As the pipeline fills, fluid enters the valve, raises the float, and shuts-off. When draining the pipeline, the float drops and allows air to enter, preventing a vacuum and possible pipeline collapse or damaging water column separation.
The AVV can also be configured as a Dual Body Combination Air Valve with an ARV Air Release Valve. The AVV Dual Body Combination Air Valve combines the functions of both an Air/Vacuum Valve to expel large volumes of air during filling or draining of the pipeline, along with an Air Release Valve to release small quantities of air during normal operation. Combination Air Valves are typically installed on all high points of a system where it has been determined that the functions of both an Air/Vacuum Valve and an Air Release Valve are needed to vent and protect a pipeline.
Combines the features of Air/Vacuum Valves and Air Release Valves. These valves are also called Double Orifice Air Valves. They are installed on all high points of a system where it has been determined dual function Air/Vacuum and Air Release Valves are needed to release air and also protect a pipeline from a vacuum. Combination Air Valves are available in 2 body styles - 1) single body combination or 2) custom-built combination with two bodies. The single body combination is used where compactness is preferred. Generally, it is sound engineering practice to use Combination Air Valves instead of simple purpose Air/ Vacuum Valves.
DUAL SERVICE AND WASTEWATER APPLICATIONS
APCO Single Body Combination Air Valves (ASU) can be used for clean or dirty services. The unique and patented venting design provides varied and predictable airflow over a wide range of air release and air/vacuum conditions. A large diameter Air/Vacuum Disc provides high volume airflow for rapid venting during pipeline filling and allows high volumes of air to enter the pipeline during draining. During normal pipeline flow conditions, the dual-range air release design prevents air build-up and resultant flow restrictions under changing conditions and through the full flow range.
All 316 stainless steel construction and without troublesome linkages this valve automatically adjusts for air release eliminating the need for sizing this function. Inlet and outlet are the same size per AWWA allowing the best vacuum relief in the industry.
WASTEWATER APPLICATIONS
Because sewage media generates large quantities of gas, the potential for air entrapped with sewage pipelines is even greater than in water lines. It is recommended that each high point be protected with a Sewage Air Release Valve. The elongated body of the Sewage Air Release Valve minimizes clogging by permitting use of a much longer float stem to prevent the sewage from fouling up the mechanism.
Air/Vacuum valves allow large volumes of air to be exhausted from or admitted into a pipeline as it is being filled or drained. The elongated body of the Sewage Air/Vacuum Valve minimizes clogging by permitting use of a much longer float stem to prevent the sewage from fouling up the mechanism.
Single and Dual Body Sewage Combination Valves
Sewage combination air valves operate the same as Air Valves for Water, differing only in appearance with elongated taller bodies. Elongated bodies minimize clogging by permitting use of a much longer float stem, to prevent the sewage from fouling up the mechanism. For ease of maintenance, Flushing Attachments are recommended with the Valves, as shown. When adding Sewage Air Valves to your pipeline, the same criteria applies, as with the standard Air Valves. However, the potential for air entrapped with Sewage pipelines is even greater than that found in water lines, because Sewage media generates large quantities of gases. Therefore, it is recommended each high point be protected with an automatic Sewage Air Release Valve.
The Custom Combination Sewage Air Valves are dual function venting large volumes of air through the large orifice and small pockets of air through the small orifice before shutting off spurt free. Thereafter, while the air valve is pressurized, pockets of air collecting will be vented through the small orifice automatically. Should vacuum develop in the force main, the upper spherical float will open the large orifice permitting large volumes of air to re-enter the force main to break the vacuum. The upper float is protected against opening vacuum impact with a Buna-N Bumper. When the force main returns to normal pressure, the Combination Sewage Air Valve will close without spillage.
