Air relief valve C70 series

for water systemsfor pipelinesstainless steel

Product Overview
BERMAD C70 is a combination air valve designed for waterworks and irrigation networks. It evacuates air during pipeline filling, vents trapped air pockets under pressure and admits large air volumes during draining. The valve incorporates a double orifice with a patented 2-step automatic orifice and a Surge Protection (anti-slam / slow closing) device to reduce pressure transients and water spray during air release.

Key Features

• Straight-flow body with equal nominal inlet and outlet sizes for increased flow capacity.
• Dynamic sealing effective at low pressures (approx. 1.5 psi / 0.1 bar) to prevent leakage.
• Patented two-stage automatic orifice (double orifice) that minimizes water spraying during air release.
• Three optional outlet configurations (sideways, downward, circular mushroom) with 360° swivel for flexible site installation.
• Compact, robust structure with fully corrosion-resistant internal parts for reduced maintenance and long service life.
• Surge Protection (anti-slam / slow closing) and double orifice for improved protection against pressure transients and air column separation.
• Factory-tested performance including vacuum condition tests.

Certifications & Compliance

• Functional approvals: WRAS (UK), EN-1074/4 (Europe), AENOR (Spain), SAI AS4956 (Australia), WSAA (Australia), PUB SS 375 (Singapore).
• Designed to comply with AWWA C512 (USA).
• Drinking water approvals: WRAS, ACS (France), NSF-ANSI-CAN 61 and NSF-ANSI 372 (USA), SAI AS4020 (Australia), PUB SS 375 and SS 270 (Singapore).
• Factory quality control and testing on specialized test benches, including vacuum tests.

Typical Applications

• Pumping stations and deep-well pumps: air relief, surge protection and vacuum prevention.
• Pipelines: protection against air accumulation and vacuum formation at high points, slope changes and crossings.
• Water distribution and irrigation networks: protection against water column separation, vacuum and pressure surges.

Technical specifications

• Model: C70-C
• Series: Air Valves Series
• Body material: Ductile iron
• Double orifice with patented 2-step automatic orifice (automatic air release)
• Surge protection: anti-slam / slow closing device
• Low-pressure sealing capability: effective down to approx. 1.5 psi (0.1 bar)
• Outlet options: sideways, downward, circular mushroom; each outlet can swivel 360°
• Intended segments: Waterworks, Irrigation
• Performance testing: factory-tested including vacuum conditions