Series 188As are designed to protect drinking water supplies from backsiphonage of contaminated water in accordance with national plumbing codes and water authority requirements for non-potable service applications such as irrigation, fireline, or industrial processing. Features a lightweight, durable “disc float” suitable for temperatures up to 180°F (82°C) which closes the atmospheric vent to prevent spilling under all rates of flow. Upon downstream demand, the vent disc assembly rises, sealing the atmospheric vent, allowing water to flow. A loss of supply pressure or the creation of a negative supply pressure causes the vent disc assembly to drop, opening the atmospheric vent and closing the supply side of the valve. Contains a durable silicone disc which has high heat and waterhammer shock resistance and ensures tight seating with the lightest of seating contacts.
An anti-siphon vacuum breaker shall be installed where indicated on the plans to prevent the backsiphonage of contaminated water. This device is not to be used under continuous pressure or where there is a possibility that a backpressure condition may develop. The device shall meet the requirements of A.S.S.E. Standard 1001, ANSI A112.1.1 and C.S.A. B64. Watts Series 188A.
- Body: Brass
- Internal Trim: Bronze
- Seat Disc: Silicone
- Disc Float: Plastic