Pneumatic control valve is a very important and very commonly used in industrial production of electrical control equipment, it is working properly or not directly related to the smooth production. At present, with the continuous improvement of pneumatic control valve technology, pneumatic control valve manufacturers and types are also more and more different functions, we must first check before buying equipment parameters to determine which one to apply. Arrival before installation is best tested in advance to see if it meets the purchase needs and design requirements. Pneumatic control valve of each technology should meet the design requirements, arrival inspection should focus on checking the following aspects: The first is the body and valve trim specifications, which include: valve type, valve type, nominal diameter, Seat size, spool form, flow characteristics, leakage level, valve body material, valve material, seat material, CV value, flange standard grade size and sealing surface form, etc., as long as the discovery of the same content and design are not Design and approval should be obtained. Followed by the implementing agencies, should check the executing agency model, type, form of action, spring range, supply pressure. In addition to check the locator section, the main check locator input signal, gas pressure, electrical and gas source interface size and explosion-proof rating, of which explosion-proof rating may not be less than the design level requirements. The last is to check the next one by one under the annex, according to the design requirements of the pneumatic control valve carefully clean the various accessories, such as filter valve, valve position switch, solenoid valve, hand wheel mechanism, special tools. The above contents of the inspection can be cleaned, measuring instruments, check the nameplate and special testing methods (such as flange and bolt material can be identified by spectroscopy) and other methods to achieve.