Pneumatic control valve is a very important control equipment and electrical are widely used in industrial production, it is working properly or not directly related to the production smoothly or not. At present, with the continuous progress of technology of pneumatic control valve, pneumatic control valve manufacturers and more and more species, also have different functions, we in the purchase before the first to check the equipment parameters in determining the applicable a. Before the installation of the best prior arrival inspection, have a look whether meet the purchase requirements and design requirements.
Each technology of pneumatic control valve should meet the design requirements, should be in the arrival inspection the inspection focused on the following aspects: the first is the valve body and the valve specifications, which includes: valve type, valve type, nominal diameter, valve seat size, spool form, flow characteristics, leakage levels, body material valve, valve seat material, material, CV, flange sealing surface of the standard grade size and format, as long as that which does not match the content and design should be designed to identify and obtain approval.
The second is the executive body part, should check the executive agency model, type, function form, spring range, supply pressure. In addition to check locator section, mainly check the input signal, the locator air pressure, electric and gas source interface size and level of explosion-proof, explosion-proof requirements shall not be less than the design grade. Finally is the one by one check attachments, according to the aerodynamic design technology of the regulator requires careful cleaning of the accessories, such as filtration pressure reducing valve, valve position switch, solenoid valve, hand wheel mechanism, special tool. The content of the above test can clean up, measuring instruments, view the plate as well as specific testing methods (such as the flange and bolt material can be identified by spectral analysis) and other methods to achieve.
