PEHD End Backflow Flap Valves
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The TBS flap valves are used both for gravity / free-flow applications (PTK) and for pumping stations (PWK), covering the full diameter range from 150 mm to 2000 mm, or even larger.
Advantages:
- No counterweights are required to facilitate opening (the low density of PEHD is lower than that of water). Ballasting the flap is necessary to ensure proper closing and to prevent buoyancy!
- The specific density of PEHD is 950 kg/m³. Therefore, additional ballast is added so that the final density reaches at least 1100 kg/m³, meaning a 12% increase in the total weight of the PEHD flap when stainless-steel ballast is used.
- Very low opening pressure, in the range of a few mmWC, compared to cast iron or steel products.
- Low opening pressures prevent sediment build-up behind the flap, thereby reducing maintenance costs.
- No corrosion, and sludge does not adhere to the surface—resulting in low maintenance costs and long service life.
HDPE end flap valves
HDPE flap installation
HDPE Advantages (High Density Polyethylene)
- Low specific weight, therefore quick and easy installation.
- High chemical resistance to salts, acids, alkalis, oils etc.
- High UV resistance.
- Good sliding properties.
- Long service life: 50 years.
- Operating temperature: between -30 and +50° Celsius.
- Maintenance free.
- No additional coatings required to increase durability.
- High flexibility in design and manufacturing: no high molding costs / special items can be produced easily.
Type PTKN-G: PEHD End Backflow Flap Valve
- Use: This model is used both below and above the discharge level. Not for permanent underwater use.
- The main purpose is to prevent backflow of water during heavy rainfall, etc.
- The vertical position ensures minimal head loss. The flap’s center of gravity is just below the hinges, so opening is not hindered by the flap’s own weight, considering the vertical wall position. The differential pressure required for opening is less than 10 mmcA.
Type PTKN-A: PEHD End Backflow Flap Valve
- Use: This model can be used in permanent submersible conditions and in areas with frequent, strong waves.
- The hinge system is not affected by flow or wave motion.
Type PWKN-F: PEHD End Backflow Flap Valve
- When the pump starts, air remaining in the pipe is released through the vent pipe.
- This prevents shocks during flap operation.
- When the pump is operating normally, the air vent has no function.
- The flap operates normally.
- When the pump stops, air intake protects both the flap and the pipeline.
- Prevents vacuum formation.
- Prevents excessive forces acting on the flap and hinges due to water hammer.
- The vent slows flap closure, ensuring controlled operation.
- Professional expertise
- Over 15 years of activity
- Know-how and innovation
- Tailored approach to each project according to specific criteria
