Valves for wastewater treatment plants
Wastewater carries fibres, grit, grease and aggressive substances, and hydrogen sulphide attacks metal from outside. Valves at treatment plants must withstand both the medium and the atmosphere.
TAZ Engineering Team · · 6 min
Pump stations and rising mains
Sewage pump stations use full-bore resilient-seated gate valves, ball check valves that do not clog with rags, and gate valves on rising mains.
Sludge
Knife gate valves suit sludge and thickened sludge: they cut through fibrous material and leave no cavities. Wedge gate valves with a body pocket lose tightness quickly in sludge.
Aeration
Blowers feed air to aeration tanks through large low-pressure pipework, which uses butterfly valves, including actuated ones for air flow control.
Corrosion
The plant atmosphere is aggressive. Specify internal and external epoxy coating, stainless stems and bolting, and inspect coatings periodically.
Checklist
- pump station, sludge or aeration
- DN and pressure
- gate or butterfly valve type
- coating
- stainless bolting
- actuators