Series ARV is a normally-open valve. Until your system is pressurized, the valve is simply open, and air is present. As pressure builds within the system, unwanted air is forced to the highest point in the system, i.e., the normally-open Air Release Valve. When pressure within the system exceeds atmospheric pressure, air is expelled. As liquid rises, the poppet becomes buoyant and eventually closes. (Note minimum specific gravity of liquid must be .9 or higher). It is possible that trace amounts of air will remain in the system, depending on the rapidity with which the valve closes. It is also likely that some trace amounts of process liquid will be emitted. At system pressure of 10 psi (with EPDM elastomer), the poppet will seal bubble tight against the orifice. When pressure and liquid level drop, the valve will automatically re-open.1
The poppet is guided by a series of thermoplastic ribs within the valve. The poppet is a unique design by Plast-O-Matic Valves, Inc. that is engineered to provide a balance of buoyancy and sealability. This balanced poppet is the key to the superior performance of this valve: It is dense enough to permit maximum emission of unwanted system air, yet buoyant enough to affect a quick seal and minimize emission of the process liquid. Historically, competitive air release valves have used ball-type sealing mechanisms that either seal too rapidly or allow excessive liquid to escape.
1Note that although Series ARV is a normally open valve, it should not be used in lieu of a vacuum breaker due to safety considerations. Under certain conditions, a normally-open air release valve will not perform properly as a vacuum breaker.
| Available in Geon® PVC & Corzan® CPVC | |||||||
Pipe Size (NPT) |
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| ARV(series) 050(size) EP(seal material) T(threaded) - PV(body material) Part numbers shown are EPDM seals with PVC bodies. Note that all three sizes are based on the 1" valve; the 1/2" and 3/4" sizes use reducing bushings. • For Viton seals, change "EP" to "V" (ARV050VT-PV) • For Corzan CPVC body, change "-PV" to "-CP" (ARV050VT-CP) • Standard connections are threaded. For socket connection, change "T" to "S" after seal material (ARV050EPS-PV) • For spigot or other connection types, consult factory. |
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| Pressure required for bubble-tight seal | EPDM Elastomer: 10 PSI | Viton Elastomer: 15 - 20 PSI |
| Pressure Rating at 70ºF | 150 PSI | |
| Maximum Air Flow Rate** | Air Flow Rate: 8 SCFM | Liquid Flow Rate: 60 GPM |
| **Note that excess of 8 SCFM airflow out of the valve will have sufficient force to lift and close the poppet, even though more air may be in the system. Liquid pumping into the system at flow rate exceeding 60 GPM (225 LPM) will create airflow in excess of 8 SCFM. | ||
Series ARV should be installed at the highest possible point in a piping system or vessel, and it must be oriented upright. In most cases, residual liquid and/or vapor in the valve may be expelled from the outlet port just prior to valve shut-off. Therefore, it is recommended to pipe the outlet port to a safe area for hazardous liquids, or use a standpipe for non-hazardous liquids.
For detailed installation instructions, please click here.
CAD DRAWING -- ARV (1") 2D CAD drawing in .dwg format.
Catalog Sheet: For specifications and catalog page in .PDF format, please click here.
Self-Training Powerpoint: Specific to Series ARV; please click here.
Degassing Valve: Remember that an Air Release Valve is used to expel a large volume of air at system start up. A Degassing Valve sounds similar, but is different from an Air Release Valve...If your application requires continuous expulsion of trace amounts of outgassing throughout the day, please click here for degassing valve information.
Plast-O-Matic Valves, Inc.
1384 Pompton Avenue
Cedar Grove, NJ 07009 USA
Voice: (973) 256-3000
Fax: (973) 256-4745
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