There are many precautions in the selection process of the exhaust valve, so as to ensure the safe use of the exhaust valve.
1. For long-distance pipelines, the ideal exhaust method is to install exhaust valves with a large number and a small diameter within a short distance (generally 500-1 000 m), rather than installing a large number of exhaust valves with a large diameter. Few, long-spaced exhaust valves.
2. In most cases, it is required to install a three-function combined valve of small-capacity automatic exhaust, large-capacity system water-filling exhaust and system emptying vacuum destruction, that is, a composite exhaust valve.
3. If you choose an exhaust valve without slow closing, it is best to install two exhaust valves, one large and one small, in one place. If the exhaust valve with slow closing is used, only one can be installed at the top of the pipe. For pipelines with many undulations, exhaust valves should be installed at each high point.
4. When there are different slopes on the highest two sides, determine the size of the exhaust valve according to the slope with severe conditions.
5. The position selection of the exhaust valve is more important than the diameter selection.
