流通能力大、流阻小。这是因为开启后阀芯位于藏球室内，阀体流道呈直筒式。
Flowing capability is big and the flow resistance is little. When the valve opening, the valve core is located inside ball cavity and the flow route is straight tube.
流通能力大、流阻小。这是因为开启后阀芯位于藏球室内，阀体流道呈直筒式。
Flowing capability is big and the flow resistance is little. When the valve opening, the valve core is located inside ball cavity and the flow route is straight tube.
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