Soft and hard seal are able to complement each other. The seal ability of soft one is better than hard one, however, hard seal now can also meet some requirements. Soft seal has better sealing ability, but can easily age, wear and has a short lifespan. Hard seal can be used longer, but has poorer sealing...
Three-eccentric metal hard seal butterfly valves are a kind of advanced butterfly valves. The valves use body and seat as connection. The sealing face of seat on the butterfly valves is made of bead welded stellite material having high temperature resistance and corrosion resistance. Multilayer soft...
Appropriate connections between valves and pipes have direct influence on possibility of valves leakage. Connections in common use include flanged connection, wafer connection, butt welding connection, threaded connection, sleeve connection, hoop connection, self-sealing connection, etc. ...
Valves are a kind of hardware products in common use. There are definite requirements for valves before or during assembling. Otherwise, valves having been assembled cannot show their excellent properties. Requirements for valves before assembling: 1. According processing requirements,...
Pneumatic tefulong butterfly valves use disc with ball sealing surface cylinder packed by PTFE, having convenient operation, rigorous sealing performance and long service life. The butterfly valves can be used for rapidly cutting off or regulating flow. Pneumatic tefulong butterfly valves are suitable...
Rubber lined valves have both cutting-off and flow regulation performance. Rubber line valves are convenient for on-off without influence on flow, ensuring the repeatability of flow. The valves open slowly, reducing the impact on instruments caused by instant pipe pressure. Rubber lined valves are exclusively...
With large programs being put into construction, valves are widely used in power, petroleum, chemical industry, urban supply and drain water system. Particularly, butterfly valves have large usage. So customers are facing with more and more problems when using butterfly valves. The...
Long distance pipeline is a global energy supply line, from Arctic Circle to Equator, high mountains to seabed, high lands to deserts, crossing through earthquake zone, marshland, rivers, lakes and mountain slopes. Some of pipelines are erect. Some are buried under the ground and some are operated in...
In general, stainless steel ball valves are suitable for media, such as water, solvents, acids and gas. High quality stainless steel ball valves are also appropriate for media having wicked working conditions, like some corrosive media. And stainless steel ball valves are widely applied in various industries....
When high vacuum butterfly valve is used, temperature has great influences on its performance. High temperature impacts on high vacuum butterfly valve: When the valve is used in the scope of creep temperature, prestressing force on bolts falls due to flanges, bolts and gaskets loosening. Flange...