Watts 0841005 SVA Vent

The Watts 0841005 SVA Vent is a professional-grade 1/8" angle vent engineered for high-performance air removal in one-pipe steam heating systems. As a technical replacement for standard non-vacuum adjustable float-type steam air vents, this unit features a heavy-duty brass body and an internal brass float designed to withstand the rigors of commercial and residential steam mains. This adjustable steam air vent allows for precise proportional venting, making it a critical component for balancing heat distribution across radiators, convectors, and steam mains. By managing the rate of air escape, technicians can ensure that distant radiators heat at the same rate as those closer to the boiler, preventing short-cycling and uneven temperature zones.

Designed for vertical installation via a 1/8 inch NPT male threaded side connection, the Watts SVA Series is rated for a maximum pressure of 10 psi (68.9 kPa), though typical operating pressures in modern systems often remain below 1.5 psi for optimal efficiency. The adjustable port opening allows for "fast venting" settings, which are essential when purging large volumes of air from system mains during the initial heating cycle. This part serves as a direct SVA replacement, maintaining the system integrity required for veteran contractors managing legacy hydronic configurations.

• Precise Balancing: The manual adjustment dial enables proportional venting to fix cold spots in multi-unit buildings.
• Durable Construction: High-quality brass body and float assembly provide superior corrosion resistance compared to stamped steel alternatives.
• Broad Compatibility: Standard 1/8" angle connection fits most existing radiator and convector tappings without the need for additional bushings.
• Rapid Air Removal: Specifically designed for non-vacuum steam systems to eliminate air pockets that cause pipe banging and reduced heat transfer.
• High Pressure Rating: Safely handles surges up to 10 psi, well above standard residential steam operating ranges.

How do I adjust the venting rate on the Watts 0841005?
Rotate the top adjustment dial to change the port size. A larger opening increases the venting speed for radiators further from the boiler, while a smaller opening slows down venting for radiators that heat up too quickly.

Is this vent compatible with vacuum steam systems?
No, the Series SVA is a non-vacuum type vent. It is designed to vent air out but does not incorporate a check valve to maintain a vacuum in the system after the boiler cycles off.

Can the Watts SVA be installed horizontally?
This angle vent must be installed in a vertical orientation to allow the internal float mechanism to rise and fall correctly with the presence of steam and condensate.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.