Applications
Water Treatment Works
Control, isolation and metering valves for treatment and process duties.
Water treatment works operate continuous processes where valve reliability directly affects output quality and throughput. Whether controlling flow to a filter bed, isolating a dosing point or managing level in a sedimentation tank, the valves specified must deliver accurate, repeatable control under varying inlet conditions and must be maintainable without taking the whole process offline.
Overview
Treatment works introduce an additional requirement beyond distribution-standard fittings: the ability to control flow and level with precision. A gate valve that is either open or closed is adequate for distribution isolation, but a treatment process that requires a flow to be maintained at a set rate or a tank to be held at a specific level demands a modulating control valve with appropriate pilot and sensing equipment. The selection of the right valve type and the right pilot configuration for each duty is critical to process stability.
Process Isolation
Butterfly valves are the standard isolation fitting at treatment works because their compact face-to-face dimension and low headloss suit the confined pipework arrangements typical of process plant. Concentric rubber-seated designs handle general isolation duty on raw and treated water. Where tight shutoff is required on chemically dosed streams or where temperature cycling is a factor, double-eccentric designs with a metal seat offer improved sealing and longer service life.
Flow and Level Control
Pilot-operated globe control valves handle the majority of flow and level control duties at treatment works. A modulating float valve maintains reservoir or tank level by throttling against the inlet pressure as the float rises, without any external power supply. Flow control valves hold a set rate regardless of upstream or downstream pressure variation, which is important on filter inlets where even distribution across multiple beds is required. Pressure reducing valves protect sensitive instrumentation and downstream processes from pressure excursions on the supply main.
Instrumentation Protection
Flow meters, pressure transmitters and water quality sensors require clean, debris-free flow and stable upstream conditions to perform accurately. Y-strainers installed upstream of meters and control valves capture particulate matter before it reaches sensitive equipment. Dual check valves prevent backflow contamination at sampling points. Where chemical dosing lines connect to the main process pipework, check valves prevent back-contamination of the dosing equipment from the higher-pressure process stream.
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