Description
The D-020 SB is a complete package that combines the reliable and efficient properties of the A.R.I.
D-020 wastewater air valve with the added feature of a sub-surface valve that can be buried below ground. A specially designed shut-off valve - situated at the base of the D-020 SB assembly allows maintenance from ground level.

The shut-off valve is equipped with a safety mechanism enabling disconnection and removal of the D-020 air valve from its subsurface housing, even when the system is under pressure. Since service and maintenance operations of the unit are performed entirely from the surface, there is no need for safety considerations associated with confined space entry.

Main Features
• Working pressure range: 3-250 psi. Testing pressure 360 psi.
• Working temperature: 140° f.
• Maximum working temperature for short time period: 194° f.
• A combination air valve for wastewater, with a large air/vacuum orifice and a small automatic air release orifice, integrated into one body.
• The air valve’s inlet diameter is 3”.
• Pipe connections: 3” threaded (NPT) or flanged, in accordance with ASA 150 standards.
• The D-020 SB integral, flat, quarter-turn, knife shut-off valve has a 3” full bore passage.
• The shut-off valve is operated from the surface.
• Easy and efficient back flushing, for cleaning, can be achieved while the air valve is in its sub-surface housing.
• All connections are quick connections, to facilitate handling and maintenance operations, flushing (inlet & outlet) connections and adaptor connected to the shut-off valve).
• Safety elements: Disengaging the air valve is safeguarded: unless the shut-off valve is in “closed” position, and the internal pressure is released, It is not possible to extract the air valve.
• All parts are corrosion resistant: Metal parts - made of St.St., Ductile Iron or steel. Composite material parts – made of Nylon, PA, PVC.

Valve Selection
• The main part of the air valve's body is made of Stainless Steel
SAE 316 or Steel DIN St.37
• The cover and top of the air valve are made of Reinforced Nylon
or Stainless Steel SAE 316.
• Addition of One-Way attachments (optional): One-Way in, One-Way out, slow release (non-slam).

Ordering
Upon ordering, please specify: model, size, working pressure, threads/flanges standard and type of liquid.

More information:

Data sheet