国产国产午夜福利视_好吊妞在线_欧美国产一二区_a在线亚洲男人的天堂在线_久久人做人爽一区二区三区小说_免费看av在线

The opening and closing part of J44H/Y Angle globe valve is a plug-shaped disc with a flat or conical sealing surface and the disc moves in a straight line along the center line of the fluid.Angle globe valve is also called Angle valve, the movement form of the valve stem, there are lifting stem type (stem rise and fall, handwheel does not rise and fall), there are also lifting rotary stem type (handwheel and valve stem rotate rise and fall together, nut is located in the valve body).