Can A Butterfly Valve Be Used For A Hot Water Tap?

butterfly valve valve can be used for hot water taps requires to be considered according to the specific situation: hard-sealed butterfly valves can be used for hot water pipes, but due to aging rubber, do not recommend the long-term use of soft-sealed butterfly valves. Specially designed high temperature soft seal butterfly valves or metal seal butterfly valves can meet the needs of hot water, but cost and compatibility must be balanced. The specific analysis is as follows:
1.Hard Sealed Butterfly Valve: Suitable for Hot Water Pipes
Hard-seal butterfly valves use metal (such as stainless steel) as their sealing surface, which is sealed by contact betweenmetal and metal. Advantages include:
High temperature resistance: The metal sealing surface can withstand high temperature hot water (such as above 150°C), in long-term use is not easy to deformation or aging.
Long service life: compared with soft seal butterfly valves, hard seal butterfly valve butterfly valves sealing surface is more wearable, suitable for hot water pipes opening and closing frequently.
Widely used: It can be used in the fields of urban heating, industrial hot water circulation and so on, and meet the needs of hot water flow control.
Typical cases:
Hard sealed butterfly valves are often used to control hot water flow in urban central heating systems. Their metal sealing structure can withstand hot water temperatures of 80-150 degrees Celsius for a long time. In industrial hot water pipelines, hard seal butterfly valves can protect the metal sealing surface from abrasion of impurity in the hot water, thus ensuring the reliability of the seal.
2. Soft Sealed butterfly valves: Be Careful When Using in Hot Water
Soft sealing butterfly valves are sealed with rubber (e.g. nitrile rubber, EPDM) or fluorinated plastics (e.g. polytetrafluoroethylene). Its limitations are:
Rubber ageing:
Normal rubber has a temperature resistance of between -20°C and 150°C, but under practical conditions, fluctuations in the temperature of hot water (e.g. between 70°C and 90°C) can accelerate the ageing of rubber and lead to a decrease in sealing performance.
Prolonged exposure to hot water can cause rubber to harden, crack and even fall off, causing leaks.
Cost and longevity:
High-temperature resistant rubber,such as silicone rubber, can improve the temperature resistance of soft-sealed butterfly valves, but it is much more expensive and has a much shorter service life than hard-sealed butterfly valves.
In hot water applications, soft-sealed butterfly valves require to be seal replacement periodically, resulting in high maintenance costs. Applicable Scenarios:
Butterfly valves with high temperature resistant rubber seals are available for short or intermittent hot water use,such as laboratory hot water piping.
Soft sealing butterfly valves may be an economical option for applications with low hot water temperatures (e.g. ≤ 70°C) and less stringent sealing requirements.
III. Hot Water Tap Valve Selection Recommendations
Hard seal valves are preferred:
Hot water taps are often turned on and off, and hard-sealed butterfly butterfly valves ball ball valves the metal sealing surfaces that are more abrasive and last longer.
For example, in domestic hot water supply systems, hard-sealed ball valves have more superior sealing performance and lower maintenance costs than butterfly valves valves.
Avoid prolonged exposure of soft-sealed butterfly valves to hot water:
If a soft seal butterfly valves is required, choose high temperature resistant rubber and check the seal regularly.
For example, in hot water pipes for the chemical industry, soft-sealed butterfly valves require temperature monitoring to prevent rubber failure due to overheating.
Consider dedicated hot water valves:
Hot water taps can use special valve (such as ceramic valve core faucet). Its sealing material (such as ceramics) is heat and wear resistant, and more suitable for long-term hot water operation. Electric faucets, for example, have ceramic valve cores that can withstand the heat generated by instantaneous heating and provide stable sealing performance.