SCH8O/DIN UPVC/CPVC Handle Butterfly Valve

How to correctly select UPVC/CPVC handle butterfly valve? Key parameters and industry application guide

UPVC (unplasticized polyvinyl chloride) and CPVC (chlorinated polyvinyl chloride) handle butterfly valves are widely used in many industries due to their excellent corrosion resistance, lightweight design and economy. Correct selection requires comprehensive consideration of material properties, operating parameters and industry needs. The following are key selection points and typical industry application analysis.

1. Key selection parameters
Media compatibility
UPVC is suitable for weak acids, weak bases and normal temperature water, while CPVC has higher temperature resistance (up to 90°C or more) and can withstand more corrosive media (such as concentrated acids and solvents).
It is necessary to confirm whether the medium components (such as chloride ions, organic solvents) react with the valve material.

Temperature and pressure range
UPVC is usually suitable for 0°C~60°C, and CPVC can be extended to -10°C~90°C.
The working pressure generally does not exceed PN16 (1.6MPa) and needs to be selected according to the pressure of the pipeline system.

Valve size and connection method
Common diameters are DN15~DN600, flange type (ANSI/DIN standard) or wafer type connection, which needs to match the pipe specifications.

Operation method
The handle butterfly valve is suitable for frequent manual opening and closing. If automatic control is required, a gearbox or pneumatic/electric actuator can be selected.

Sealing material
EPDM (water-resistant, weak acid and alkali), FKM (oil-resistant, strong acid) or PTFE (corrosion-resistant, high temperature), selected according to the medium.

II. Industry application guide
1. Safe drinking water
Applicable UPVC butterfly valves meet sanitary standards (such as NSF/ANSI 61) and are used in municipal water supply and water purification plant pipelines.
Pay attention to chlorine tolerance and avoid long-term contact with high-concentration disinfectants that may cause material aging.

2. Metallurgy industry
CPVC valves are more suitable for pickling and electroplating liquid (such as sulfuric acid and hydrochloric acid) transportation, and UPVC can be used in cooling water systems.

3. Photovoltaic
In the treatment of acid and alkali waste liquid in polysilicon production, CPVC has better corrosion resistance than metal valves.

4. Nuclear Power
Auxiliary cooling water or low-radioactive wastewater system needs to pass radiation resistance certification, and CPVC is usually selected to enhance stability.

5. Electronic Semiconductor
Ultrapure water (UPW) transportation requires no metal ion pollution, and UPVC butterfly valves are matched with high-purity EPDM sealing rings.

6. Medicine
Water for injection (WFI) or clean fluid pipelines, valves must meet FDA or GMP standards to avoid material precipitation.

7. Industrial Water Treatment
UPVC is suitable for reverse osmosis (RO) and softened water systems; CPVC is recommended for chemical agent addition (such as sodium hypochlorite).

8. Industrial Wastewater
In the case of heavy metal and high-salt wastewater, CPVC has better chemical corrosion resistance than UPVC.

III. Selection considerations
Avoid over-temperature use: UPVC is easy to deform at high temperatures, and CPVC needs to pay attention to long-term thermal stability.
Installation environment: Outdoor applications require UV protection (select gray/black valve body), and pay attention to low-temperature brittleness in cold areas.
Maintenance cycle: Regularly check the wear of the sealing ring to prevent medium crystallization or particulate matter from blocking the valve plate.