Bermad 350 Series Metal Filter Backwash Valves

The Bermad 350DC-A-3X2 is a high-performance double chamber automatic backwash valve, engineered for efficient and reliable backflushing of media and disc filtration systems. Designed as an upgrade over traditional single chamber models, this robust 3-port valve provides smooth flow transition, water conservation, and long service life under demanding conditions.

Suitable for use in gravel, sand, disc, and screen filters, the 350DC-A valve features a cast iron body, precision plug assembly, and dynamic sealing mechanism for drip-tight closure during automatic backwash cycles. Its diaphragm-actuated design ensures that when the backwash port opens, the water supply port closes—facilitating effective discharge of dirty water to waste.

Available in angled or inline configurations, this valve is ideal for use in filter battery systems or single autonomous filters.

APPLICATIONS

• Automatic backwash for filtration batteries
• Gravel, sand, disc, and screen filters
• Single-filter autonomous backwash systems
  

FEATURES

• Compact and efficient 3-port valve design
• Drip-tight sealing at supply and drain ports
• Short travel for fast, smooth operation and minimal water waste
• Dynamic diaphragm-actuated plug assembly
• Long-lasting, corrosion-resistant components
• Ideal replacement for older single chamber models
  

TECHNICAL DATA

• Operating Pressure: 0.7–10 bar (10–145 psi)
• Control Chamber Volume: 0.34 L (0.09 gal)
• Max Temperature: 65°C (150°F)
• External Actuation Pressure: 85–100% of line pressure
• End Connections:
  • Inlet (Port 1) & Outlet (C): 3" Grooved
  • Drain (Port 2): 2" Threaded
• Flow Pattern: Angled
  

MATERIALS

• Body: Cast Iron
• Cover & Partition: PA6 (30% Glass Filled)
• Diaphragm: Reinforced NR-AL52
• Seats & Diaphragm Washers: Brass
• Plug & Washer: Acetal Copolymer
• Stopper Disk: PVC-U
• Seals/O-rings: NBR
• Spring: Stainless Steel AISI 302
• Shaft: Stainless Steel AISI 303
• Bolts/Nuts/Studs: Stainless Steel