The NUVENT 70-555bl is an anti-shock air valve for sewage applications. It protects against damaging pressures, releases pressurised air, and prevents vacuums.

Product Overview

The NUVENT AQUA 70-555bl is an anti-shock air release and vacuum breaker valve designed for sewage applications. The valve provides automatic surge protection with an integral 'Anti-Shock' mechanism to minimise flushing cycles. It ensures effective de-aeration under all operating conditions and provides vacuum protection. The valve is virtually maintenance-free as it is assembled from corrosion-free materials.

Key Benefits

• Automatic Surge Protection: The integral 'Anti-Shock' mechanism helps to prevent damaging pressures by restricting air discharge to decelerate the approaching water column, dampening transients when the valve closes.
• Effective Air Release: It ensures effective de-aeration under all operating conditions by discharging accumulations of pressurised air through a small orifice.
• Vacuum Protection: A large orifice diameter ensures minimal resistance to air intake, which prevents a vacuum from forming in the system at pump stop.
• Low Maintenance: The valve is assembled from corrosion-free materials, making it virtually maintenance-free.

Applications

The NUVENT AQUA 70-555bl is specifically for sewage applications. Its primary functions include:

• Preventing damaging pressures at pump start.
• Releasing pressurised air that accumulates during normal operation.
• Preventing a vacuum at pump stop.

Features & Construction

• Medium: Water / Air.
• Body: Stainless Steel, Grade 304 or 316.
• Seals: EPDM.
• Gaskets: NBR.
• Floats: High-Density Polyethylene (H.D.P.E.).

Technical Specifications

Size	Pressure Rating	Overall Height	Overall Diameter	Weight
50mm / 2"	16 bar	631mm	130mm	13 kg
80mm / 3"	16 bar	637mm	200mm	20 kg
100mm / 4"	16 bar	637mm	220mm	22 kg
150mm / 6"	16 bar	892mm	285mm	70 kg
200mm / 8"	16 bar	941mm	340mm	85 kg

Operation

• Controlled Air Discharge: An 'Anti-Shock' orifice restricts air discharge to decelerate the approaching water column and dampen transients when the valve closes.
• Pressurised Air Release: The valve discharges any accumulations of pressurised air through a small orifice.
• Vacuum Break: Air is admitted into the system at pump stop to prevent a vacuum from forming.