9000+
6000+
3000+
1000+When the credit status reflecting a corporate credit situation is quantified as the specific value of credit point, plus the value of credit point accumulated in the course of longtime online trading, it is turned out to be the credit point for this company.
When the seat and closing part connect, the seal of a valve is the part that is closed. Beacuse the seal is facing to souring and grinding, the sealing function of the seal surface is reducing according to time.
A sealed ball valve inherits the characteristic of a ball valve, which means it gets perfect shutoff even after years of idle, and is convenient to repair and operate.
There are typicially three main mehtods to seal in valves.
1. metal sealing surface
metal sealing surface is easily influenced by the particals of the medium. Therefore, it must be corrosion resistance, abrasion resistance, washing-out resistance.
2. jointing compound
inject sealing fat into the leak size between the metal surfaces after the valve is closed to get the purpose of lutation.
3. soft sealing material
soft sealing material ususlly refers to plastic and rubber. Because of the properties of this kind of material, the sealing surfaces made by these are easy to cooperrate and get a high degree of sealing. However, it is limited by the medium’s approperation and the working temperature.
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