Applications
Sewage & Wastewater
Non-clog valves for sewage rising mains, pump stations and effluent systems.
Sewage and wastewater systems impose requirements that potable water fittings are not designed to meet. Rags, solids and abrasive grit place conventional valves under conditions they fail in quickly. Equipment selected for sewage duty must be specifically designed for the medium, with unobstructed flow paths, robust sealing faces and materials that resist the corrosive and erosive environment of wastewater service.
Overview
The primary distinction between sewage duty and clean water duty is the nature of the medium. Sewage contains fibrous material, suspended solids and abrasive grit in concentrations that will block small orifices, erode soft seats and cause accelerated corrosion of unprotected metalwork. Every fitting on a sewage rising main or pump station must be selected with this in mind. A clean water air release valve installed on a sewage main will fail within months. Sewage-specific designs are not a premium option — they are the minimum appropriate specification.
Sewage Air Release Valves
Sewage air release valves use large, unobstructed orifices and corrosion-resistant ball floats that do not provide a ledge for rag accumulation. The orifice diameter is sized to ensure that any particulate matter that enters the valve body is carried through by the air or gas flow, rather than settling and blocking the mechanism. Three types cover the main sewage air release duties: kinetic valves for large-volume air release during main filling, anti-shock valves for installations where surge is a concern and combination types for general-purpose rising main installations.
Non-Return Valves for Sewage
Ball check valves and rubber flap check valves handle non-return duty on sewage mains without the risk of clogging that affects disc-type designs. A ball check valve uses a single rubber or elastomer ball in a full-bore chamber; there are no ledges, guides or complex internal geometry for fibrous material to accumulate on. Rubber flap checks are self-cleaning and tolerate passage of soft solids without damage. Both types are suitable for horizontal or vertical installation and require no external maintenance access.
Plug Valves for Abrasive Service
Where isolation is required on gritty or abrasive effluent streams, a plug valve provides a full-bore opening with no cavities for solids to accumulate. The conical plug rotates through 90 degrees to open or close, sweeping the seat face clean on each operation. Eccentric plug valve designs lift the plug clear of the seat during the first part of the rotation, reducing the torque required to break the seal and extending seat life on abrasive service. They are particularly well suited to sludge handling lines, primary effluent and storm overflow applications.
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