The 1.1 pneumatic valve specifications and categories, should be consistent with the pipeline design documents.

The 1.2 pneumatic valve should be specified based on the model national standard code requirements. If the enterprise standard, should indicate the model instructions.

The 1.3 pneumatic valve working pressure≥pipeline, requirement of work pressure, without affecting the price under the premise, can withstand the working pressure of the valve should be larger than the actual working pressure pipeline; pneumatic valve is closed under the condition of no

The 1.4 pneumatic valve manufacturing standards, should be described according to GB code, if the enterprise standard, purchasing contract shall be attached to the enterprise document.

2.2stem material, strive to stainless steel stem (2CR13), large diameter valves also should be embedded in the package of stainless steel valve stem.