Resilient Seated Gate Valvesealing surface is the most critical face S'well Travelers White Marble 500ml Ireland , sealing surface quality directly affects the life of valve sealing surface of the material is also important to ensure the quality of the sealing surface factors . Sealing surface material should consider the following factors Gate valves are double sealed deputy , according to the International Organization for Standardization IS010034: 1998. American Petroleum Institute Standard APl600-2001 and the Chinese National Standard GB T 12234-2007 requirements for double sealing of the valve, the seal test, for each direction should be closed seat tightness test, each test one direction . In the cavity for a sewage hole or vent valve, the cavity should be tested for leaks each side of the seat S'well Bottles Calacatta Gold 500ml Ireland , designed with double sealed by force ; For the sewage is not set in the cavity of the valve hole or vent . Test methods should enable the inlet end and the valve body cavity is filled with test medium and pressurized , check for leaks from the outlet end of the valve case , designed with single-sided sealed by force .
Resilient Seated Gate Valvesealing surface is the most critical face, sealing surface quality directly affects the life of valve sealing surface of the material is also important to ensure the quality of the sealing surface factors . Sealing surface material should consider the following factors: 1 , corrosion-resistant . " Etching " effect of the seal surface of the medium , the surface damage in the process . If the surface subject to such damage S'well Bottles Blue Marble 500ml Ireland , sealing can not be guaranteed, therefore , the sealing surface material must be corrosion-resistant. Corrosion resistance of materials depending on the material and its extreme chemical stability. 2, anti- scratch . " Galling" during relative movement of the seal surface , the material damage caused by friction . Such damage would inevitably lead to the destruction of the sealing surface , therefore S'well Bottles Black Marble 500ml Ireland , the sealing surface material must have good resistance to abrasion performance, especially knife gate valve . Abrasion resistance of the material inside the material properties are often determined by the . 3 , resistance to erosion . " Erosion " is the medium speed through the sealing surface , the sealing surface of the process of destruction . The damage in high temperature, high pressure steam for use in medium stainless steel butterfly valve, safety valve is more obvious S'well Bottles Royal Wood 500ml Ireland , a great impact on the seal damage , therefore , resistance to erosion is also an important requirement for the sealing surface of the material . 4 , there should be a certain hardness and hardness of the specified operating temperature under a major decline. 5, the knife gate valve , butterfly valve seal face and the main body of stainless steel materials should be approximately linear expansion coefficient S'well Bottles Lily Wood 500ml Ireland , which is set a ring structure is more important , in order to avoid high temperature stress and prone to cause additional loose. 6, in the high temperature conditions , have sufficient oxidation resistance, thermal fatigue resistance and thermal cycling and other issues. In the present case , to find full compliance with the above requirements sealing surface material is difficult to do S'well Travelers Teakwood 500ml Ireland , only depending on the valve and use , with a focus to meet a few requirements. For example, for use in high-speed medium knife gate valve , stainless steel butterfly should pay particular attention to the sealing surface of erosion -resistant requirements ; while the medium containing solid impurities should be chosen higher hardness sealing surface material .
1 -sided sealing force
This form of seal , in the pressure range from zero to p within the stem acting on the sealing surface than the pressure generated to ensure the sealing . Since the medium force , the force changes the sealing surface S'well Bottles Teakwood 500ml Ireland , when the medium inlet side of the seal surface pressure decreased, and the medium outlet side of the sealing surface pressure values ??increased . These changes depends on the gate and body rigidity. In this case , only the outlet end of the valve to ensure the sealing performance.
2 -sided sealing force
This form of sealing both ends of the medium inlet or outlet end , the shutter and the valve seat is sealed between the seal faces . Axial force from the valve stem sealing is to be guaranteed to force , when there is no media, positive pressure between the sealing surface static pressure shall not be less than the medium and with the sealing force .
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