//blog.tianya.cn/blogger/blog_main.asp9u This seems to be a URL or a part of a URL. URLs don't typically require translation, but if you'd like to express this in English for clarity, it could be described as: "The link to the main blog page on Tianya Blogging Platform." Please note that "Tianya" is a Chinese website and community, and its name is already in a form recognizable internationally. The provided string looks incomplete or incorrectly formatted since there's an unusual "9u" at the end which might not belong there. If this is indeed meant to be a URL, it should be checked for accuracy.

Beijing Bosch wall-hung boiler repair phone number: http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3778593.

What are the installation requirements for safety valves in Bosch wall-hung boilers?

Answer: The safety valve should be equipped with an exhaust pipe leading directly outside to prevent injury during exhaust. The exhaust pipe must have a sufficiently large cross-sectional area to reduce resistance and ensure smooth exhaust. Generally, the total cross-sectional area of the exhaust pipe should not be less than twice the total cross-sectional area of the corresponding safety valve. A drainage pipe connected to a safe location should be installed at the bottom of the safety valve exhaust pipe. Valves are not allowed to be installed on either the exhaust pipe or the drainage pipe.