CPVC (chlorinated polyvinyl chloride) is a durable, long-lasting, and chemical-resistant building material. CPVC is more resistant to degradation and has an improved lifespan compared to PVC. In addition, the chlorinated PVC in CPVC valves allows them to withstand higher temperatures. CPVC has a maximum operating temperature of 200°F. These characteristics make it useful in commercial and industrial settings, where chemicals and high temperatures are more likely to be present.
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The Corzan CPVC Schedule 80 thermoplastic used in some CPVC valves demonstrates excellent mechanical strength over a broad temperature range, outstanding underground performance, and superior hydraulics.
CPVC will not rust, pit, scale, or corrode. CPVC valves are easy to install and are joined by solvent cementing or threading.
CPVC valves are ideal for a variety of applications, including:
CPVC ball valves from NIBCO feature a one-piece molded CPVC body and female socket connections. Ball valves have low-pressure drops and conveniently open and close quickly with a quarter-turn.
CPVC Schedule 80 Tru-Bloc True Union ball valves have a self-adjusting seat and upstream and downstream blocking capability to stop flow. The valve’s injection-molded CPVC construction with EPDM O-ring is ideal for use in industrial systems. In addition, the valve’s operational components can be conveniently lifted from the piping system for repair or replacement, thanks to the original Chemtrol True Union design. Tru-Bloc advances the True Union concept with the self-adjusting energizer O-ring.
NIBCO also offers a Chemtrol True Union three-way, three-position multi-port ball valve ideal for applications where flow diversion and on/off control are needed. It can divert flow from either side-run inlet port to the branch center inlet port. Its full port design produces minimum flow restriction with the lowest possible pressure drop for 90° porting.
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Chemtrol True Union ball check valves from NIBCO stop the flow of media in one direction while allowing flow in the opposite direction, with minimum turbulence and chatter while maintaining pump prime. Their injection-molded CPVC construction with EPDM O-ring is ideal for systems for hot corrosive liquids, hot and cold water distribution, chemical processing, industrial plating, deionized water lines, chemical drainage, wastewater treatment systems, and similar applications above the temperature range of PVC.
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CPVC butterfly valves from NIBCO are wafer-style valves with low flow restrictions. The valves’ injection-molded CPVC construction with an EPDM seat is ideal for use in chemical applications. The disc and stem sheath is molded over a 316 stainless steel hex shaft to make a one-piece assembly. With this unique dry shaft seal, liquid never contacts the shaft, even at maximum pressure. The leak-proof design incorporates vulcanized bushings and double O-ring seals. They are easy to install but cannot be used as an isolation valve.
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CPVC stop and waste valves are typically installed in applications requiring shut-off. If the line they control needs to be drained when the flow is shut off, they may include an auxiliary opening on their side, just past the valve seat. A cap screw controls this opening. When the valve is closed, the cap may be opened to drain the water out of the non-pressure side of the line beyond that point. The valve must be mounted on the low end of the run for the pipe to drain correctly.
Shut-off valves are available with CPVC end connections for systems with CPVC piping.
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Since its inception, we have tried different materials for plumbing pipes, and technology has only made it better over time. In the ancient days, people used clay pipes to deliver clean water. The first known example of when clay pipes were used for plumbing dates to BCE in Babylonia. This is often considered the birthplace of urban plumbing.
Today, the choice comes down to two main types: plastic piping vs. metal piping.
Scaling Resistance: Water scale buildup is a concern with metal pipes, affecting water pressure and flow. CPVC pipes have smooth inner surfaces and also being inert in nature resist the formation of pipe scaling, thus maintaining consistent water pressure and extending the system’s efficiency. In Hazen William’s - the higher the C factor number, the smoother the pipe’s inner surface. At the origin, GI has a C factor of 120, and CPVC and PEX are around 150. This denotes that the flow rate in CPVC on the day of installation is better than GI and will remain the same due to no scale or corrosion buildup. However, in GI, the C factor of 120 will reduce to 100 or even lower due to corrosion & scale build-up with the passage of time.
Installation Ease and Cost: Metal pipe installation can be labour-intensive and costly, often requiring specialised skills for welding and fitting. CPVC piping system, on the other hand, is lightweight compared with metal pipe weight, thus is easy to install. The process of solvent CPVC welding is straightforward which significantly reduces labour time and installation costs.
Joint Welding: CPVC uses solvent welding to create strong and leak-proof joints. This is also termed the cold fusion process. The joining process is so simple that even common people can easily do a CPVC joining of their own. Unlike metal pipes, it does not require any special tools for joining. A plumber requires a pipe cutter, a solvent cement a chamfering tool for welding the CPVC piping system.
Pipe Weight: When compared to the metal counterparts, CPVC pipe weight tends to be considerably lighter. This further reduces the transportation costs and simplifies the handling process during installation, making CPVC an attractive option for projects of all sizes.
Fabrication Flexibility: Unlike metal piping that may require prefabrication, CPVC pipes can be easily cut and customised on-site. This adaptability allows for last-minute changes and adjustments without significant delays or additional costs.
Fire Safety: CPVC piping is fire resistant, meaning it is designed to perform better in fire conditions compared to some metal pipes. CPVC does not support combustion which further adds an extra layer of safety to the buildings.
Superior Insulation: CPVC due to its lower thermal conductivity properties results in reduced heat loss. Hence insulation costs are very low in CPVC piping systems. Metal pipes on the other hand require heavy insulation on hot water lines resulting in higher insulation costs.
Cost Efficiency: Lower installation costs, minimal maintenance, and longer service life make CPVC a cost-effective solution for both residential and commercial plumbing systems.