The vent valve comprises an air vent screw, a spring and a valve ball which leans against the channel under the acting force of the spring.
所述排气阀包括一排气螺钉、一弹簧、一钢球，阀球在弹簧作用力下抵靠通道上。
The vent valve comprises an air vent screw, a spring and a valve ball which leans against the channel under the acting force of the spring.
所述排气阀包括一排气螺钉、一弹簧、一钢球，阀球在弹簧作用力下抵靠通道上。
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