Manual stainless Steel Ball valve 2

Firstly, after pickling of the finished product, the blank must be washed clean. If there are sand holes or perforations, the gas shielded arc welding should be used. Then grind and melt.

Second: finished products, after the completion of processing pressure test. It should be washed with water added with rust-proof powder.

Third: In the transport process, as far as possible use wooden box packaging, do not touch metal products.

Fourth: After installing the pipeline, it should be regularly maintained and maintained, for example, the valve stem is often coated with lubricant. Open and close the valve properly several times. The inner ball, valve stem and sealing surface are not easy to assimilate.

Stainless steel ball valves generally have two kinds of structures: shrinkage and non-shrinkage channels. Regardless of the structure, the flow resistance coefficient of the ball valve is relatively small.

Especially the so-called full flow type, that is, non-shrinkage ball valve, because its channel diameter is equal to the inner diameter of the pipeline, the local resistance loss is only the same length of pipeline friction resistance, that is, in all valves, the flow resistance of this kind of ball valve is the smallest. In the rocket launching and test system, the smaller the resistance of the pipeline, the better.

There are two ways to reduce the resistance of pipeline system: one is to reduce the flow rate of fluid, so it is necessary to increase the diameter of pipeline and valve, which will have a negative impact on the economy of pipeline system, especially on the cryogenic transmission system (liquid hydrogen).

(1) Reduce the local resistance of the valve, so the ball valve naturally becomes the best choice.

(2) The opening and closing switch of ball valve is fast and convenient.