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2026-02-04_CAD_Klappenventil-transparent

Flap Valve

Flap Valve - the reliable solution für demanding pumping media

Diaphragm pumps operate using valves that precisely control the inflow and outflow from the pump chamber and provide a reliable seal. This is the only way to prevent backflow of the medium and ensure a constant flow rate.

Whilst conventional ball valves are used in many applications, they quickly reach their limits, particularly with media containing solids. Foreign bodies, abrasive particles or long fibres can block the flow channels, impairing the valve’s function or even causing it to fail completely.

 This is where flap valves demonstrate their stengths: they 

allow virtually unimpeded flow of solids up to a defined size. Even long fibres are reliably transported through the pump head over several pumping cycles – without impairing the valve’s function.

The flap valve combines flexible and robust materials to form a particularly durable construction. A flexible elastomer sleeve provides the necessary flexibility of the flap whilst also ensuring a reliable seal. A fully sleeved metal component guarantees the required pressure stability in the inlet and outlet areas. For larger nominal diameters, an integrated reinforcement fabric additionally ensures that even high forces in the hinge area can be absorbed permanently.

Main areas of application:
 Suitable for use in the pump industry, regulation and control engineering technology, and for pneumatic drive units. 

Technical advantages that make the difference: 
• Safe passage of solids, abrasive suspensions and long fibres
• Reliable performance even with demanding media and over multiple pumping cycles 
• Excellent resistance to aggressive media and solvents 
• No under-cutting or delamination of the composite material
• No direct contact between the medium and metal, fabric or boundary layers
• No need for costly special alloys or stainless steels
• Robust, durable and low-maintenance valve technology
• High process reliability even under difficult operating conditions

Flap Valve

Flap Valve
Applications
static
static
static
dynamic
single acting
single acting
double acting
double acting
Linear
Linear
Rotating
Rotating
oszilating
oszilating
Main use Pump Industry
Technical values
Materials:
Pressure:
Temperature: -50°C / +120°C (depending on material))
Speed:
Pressure:
Temperature: -50°C / +120°C (depending on material))
Speed:
Pressure:
Temperature: -50°C / +120°C (depending on material))
Speed:
Product details
Herr Andreas Raidt
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Technik - Allgemeine Dichtungsthemen, Sonderkonstruktionen

Herr Andreas Raidt
Bereichsleitung Technik
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 Herr Andreas Raidt
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Our Logistics – Your Service

Our Logistics – Your Service

Innovative, environmentally friendly and efficient

In addition to innovative techniques, our logistics has 2,870 sqm of process surface. We have the world's first AutoStore storage system on two levels. Both grits are connected to each other by means of special lifters. In total, up to 31,000 containers can be stored in a very confined space. Due to this subdivision, up to 240,000 storage areas can be managed most efficiently.