BQ型双偏心半球阀
BQ type double eccentric center half-ball Valve
V形调节球阀
regulation of V-ball valve
玻璃钢球阀
glass fibre reinforced plastic ball valve
不锈钢球阀
stainless steel ball valve
超低温球阀
cryogenic ball valve
ultra-low temperature ball valve
撑拢式硬密封球阀
expanding shut type hard sealing ball valves