Fleck 2850 Piston Assembly, HW

The Fleck 2850 Piston Assembly, Hot Water version (FL60105-01), is a specialized piston for the high-capacity Fleck 2850 control valve, built to withstand the elevated temperatures of hot water softening and conditioning applications. The piston is the central moving part that routes flow through the valve's service and regeneration positions, and in hot water service it must do so without the rapid wear that ordinary parts would suffer.

Hot water service

• Piston assembly for the Fleck 2850 control valve
• Hot water (HW) configuration for elevated-temperature service
• Directs internal flow through every cycle position
• Genuine Pentair Fleck component, valve model 2850, about 1.0 lb
• Built to resist heat-related wear and seal degradation
• Matched specifically to hot water systems, not standard cold-water use

Standard pistons and seals are not designed for hot water, where heat can accelerate wear, harden or soften elastomers, and shorten service intervals dramatically. The hot water version of this piston assembly uses materials suited to the higher temperatures found in commercial hot water softening, industrial process water, and similar demanding applications. Matching the correct HW component to a hot water system is essential to avoid premature failure and the repeat repairs that come with installing the wrong part.

The 2850 is a robust, high-flow valve often found on larger systems, and as the piston and its seals wear, the valve can develop internal leakage that weakens regeneration or allows untreated water to pass through to the process or fixtures it serves. Because hot water systems are frequently part of critical operations, keeping this component in good order helps avoid disruptive downtime.

When replacing the piston, install a matching hot water seal and spacer kit at the same time for a complete, temperature-appropriate refresh, and use silicone lubricant to ease assembly and protect the new parts. Always place the valve in bypass, relieve pressure, and disconnect power before service. The correct HW piston keeps your 2850 cycling reliably under hot water duty. Pairing this hot water piston with matching hot water seals and timely service keeps your 2850 performing reliably even under the demanding thermal conditions that would quickly defeat standard components.