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Valves made of PCV and CPVC are commonly used in chemic […]
Valves made of PCV and CPVC are commonly used in chemical process, potable water, irrigation, water treatment and wastewater, landscaping, pool, pond, fire safety, brewing, and other food and beverage applications. They are a good low-cost solution for most flow control needs.
All the valves are limited by the mechanical and thermal performance of their materials. It is the same case for plastic valves.
Plastic components can, however, be used successfully in metal systems. But you have to be aware of several factors that will affect the success of the application. If these factors are not taken into consideration the chance of success is reduced. Applied and installed correctly, however, the valve or strainer will perform as expected.
First, you have to be sure that the plastic valve or strainer will be used within its temperature and pressure rating. Metal piping is often used because of high operating temperatures. Make sure the temperature/pressure range of the application is within the acceptable range for the plastic product you are considering. Chemical resistance needs to be checked, as well, to ensure that there will not be a problem. Part of your application analysis should include the potential for shock pressure generation, i.e., water hammer in the system that could damage the plastic valve or strainer. Things to look for include a system flow rate of greater than 8 feet per second, quick starting pumps, positive displacement pumps, fast opening or closing actuated valves, and solenoid valves.
Plastic valves and pipeline strainers can be used successfully in many metal piping systems. You just have to be aware of all of the application parameters and how they relate to the plastic component.