High pressure air to buy skills

1, we need to determine if the field is the use of high pressure air what features are sucked or blown, identify the corresponding high pressure air pressure - flow curve; if wrong curve, sometimes resulting in the election out of the product can not be used.
2, according to the calculated pressure and flow on the graph found at the same time meet the pressure and flow rate corresponding to the operating point above the curve, and then select the high-pressure turbine model based on the work curve; as long as the different job site, the pressure and flow the demand is not the same, so, in order to obtain relatively accurate data, you need to perform related calculations. This needs to be done by a professional designer.
3, before buying high-pressure fan, you must first understand the vendor's background, such as whether it has the necessary certificates, the company's reputation and so on.
4, examine its reputation for quality products, service and attitude systems, and whether they have adopted the necessary product quality certification.
5, timely delivery, convenience of payment and so on.