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Frequently Asked Questions

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Frequently Asked Questions

Fluid control valves are primarily classified into several types based on their functions. What are the core functions of each type?

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They are mainly classified into three types: shut-off valves, control valves, and check valves.
1. Shut-off valves: Used to connect or isolate the flow of media in a pipeline, thereby opening or closing the line; examples include gate valves, ball valves, and globe valves.
2. Control valves: regulate the pressure and flow of the working medium, and modify fluid operating conditions; examples include butterfly valves and sleeve-type control valves.
3. Check valve: It automatically opens and closes based on the flow direction of the medium, preventing backflow and protecting pumps and equipment from reverse‑impact damage.

What are the primary factors that affect the service life of valves?

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① Process conditions: medium corrosivity, particulate impurities, and fluctuations in temperature and pressure; media containing particles can readily cause severe wear on the sealing surfaces.
② Sealing material: Hard seals offer excellent temperature and wear resistance but tend to have higher leakage; soft seals provide superior sealing performance but are not suitable for high-temperature applications.
③ Switching frequency: Frequent on-off cycles will accelerate wear of the sealing elements.
④ Installation and maintenance: pipeline stress, inadequate media filtration, and a lack of regular maintenance can all significantly shorten the service life.

What do valve leakage classes IV and VI signify, and how should they be selected?

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Leakage class is the standard for the allowable medium leakage rate after the valve is closed.
Class IV: General industrial standard, permitting a small amount of leakage; typically used for water and common oil‑based pipelines.
Class VI (bubble‑tight): Extremely low leakage; soft‑seal sealing surfaces; suitable for gases, compressed air, and toxic media; preferred for applications with stringent sealing requirements.
Selection criteria: For liquids under normal operating conditions, select Class IV; for gases, flammable and explosive substances, and toxic media, prioritize Class VI.

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