Questions about butterfly valves
Thread Content
We built an experimental bench to test the flow rate and head of the oil pump used in the main transformer. The medium used was transformer oil; the pump’s rated head was 16 meters, and its rated flow rate was 48 m3/h. The diameter of the pipes in the experimental setup was DN100, and the testing was carried out at room temperature. Butterfly valves were used for sealing the pipes – initially rubber-sealed butterfly valves were employed, but they stopped functioning properly after just two days. Later, PTFE-sealed butterfly valves were used, yet they also stopped working properly after two days. I would like to ask everyone: could this be a problem with the quality of the valves? As far as I know, transformer oil is not corrosive, and both nitrile rubber and PTFE should have no issues with resisting oil I would also like to ask: in this case, would it be better to use a hard-sealed butterfly valve? Hard-sealed butterfly valves are more expensive than those with soft seals – do they also offer better quality and sealing performance? Also, which domestic manufacturer produces the best butterfly valves? Thank you for your advice.
For butterfly valves, please contact China GaozhaoPa Valve Manufacturing Co., Ltd. at 18167387967 (WeChat)
I have a small question: why not use a stop valve? Also, can a check valve solve this problem? I have always believed that butterfly valves cannot be used on their own as an effective isolation measure; this is just my personal opinion, please feel free to correct me
It must be a quality issue; currently, soft-seal butterfly valves produced in Tianjin dominate the market. Most goods from Tianjin are of average quality; the \"Li\" brand products available at Tianjin’s large markets are passable
Soft-sealed butterfly valves are generally used with clean media such as pure water or similar substances. For media that are corrosive or subject to erosion, hard-sealed triple-eccentric butterfly valves can be used. Since both types utilize hard seals, the performance of high-performance butterfly valves and triple-eccentric valves is roughly similar in terms of quality. With all-metal sealing rings, the sealing grade can reach V level; whereas with sealing rings made of a combination of metal and flexible materials, the sealing grade can reach VI level. Such valves certainly last longer than those with soft seals, but they still experience wear and require replacement of the sealing rings depending on the degree of wear
Since it is necessary to measure flow rate, the valves that cause minimal interference to the flow rate are butterfly valves and ball valves; however, ball valves are not suitable for regulating flow rate
It’s indeed a Tianjin butterfly valve; it seems to be a common issue. The production team keeps saying that my selection was incorrect
It’s indeed a Tianjin butterfly valve; it seems to be a common issue. The production team keeps saying that my selection was incorrect
A butterfly valve, which relies on compression force for sealing, is not designed to be used for a long time anyway. Triple eccentricity – are there any reliable manufacturers in China capable of producing it?
A butterfly valve, which relies on compression force for sealing, is not designed to be used for a long time anyway. Triple eccentricity – are there any reliable manufacturers in China capable of producing it?