Membrane check valve Flap

for industrial applicationsmetalNBR

Product description
Diaphragm pumps use valves that precisely control the inlet and outlet of the pump chamber and provide reliable sealing. This prevents backflow of the medium and ensures consistent flow performance.

In many applications ball valves are used, but they often reach their limits with solids-laden media. Foreign bodies, abrasive particles or long fibres can block flow channels and impair or interrupt valve function.

The flap valve allows nearly unobstructed passage of solids up to a defined size. Even long fibres are reliably transported through the pump head over multiple pump cycles without impairing valve function.

The flap valve combines flexible and robust materials in a particularly resistant design. A bendable elastomer sleeve provides the necessary flexibility of the flap while performing the sealing function. A fully encapsulated metal part ensures the required pressure stability at the inlet and outlet. For larger nominal diameters an integrated reinforcement fabric in the hinge area absorbs high forces permanently.

Main application areas

• Pump industry
• Control and regulation technology
• Pneumatic drives

Technical advantages

• Reliable passage of solids, abrasive suspensions and long fibres
• Consistent operation even with demanding media and over multiple pump cycles
• Excellent resistance to aggressive media and solvents
• No undermining or delamination of the composite material
• No direct contact of the medium with metal, fabric or interlayers
• No need for costly special alloys or stainless steels
• Robust, durable and low‑maintenance valve design
• High process safety under difficult operating conditions

Operating modes / types

• Static
• Dynamic
• Single‑acting
• Double‑acting
• Linear
• Rotating (not active for this product)
• Oscillating

Technical specifications

• Materials: NBR, EPDM, FKM (material‑dependent variants available)
• Temperature range: -50°C to +120°C (material dependent)
• Mechanical design: bendable elastomer sleeve with fully encapsulated metal core; for larger nominal sizes additional reinforcement fabric in the hinge area
• Suitable for: solids, abrasive suspensions, long fibres and aggressive media
• Pressure data: not specified on the page
• Speed data: not specified on the page