当活塞自右向左移动时，缸内液体受挤压，压力增大，由排出阀排出。
When the piston moving from right to the left, the cylinder of liquid by squeezing, pressure, discharged from the discharge valve.
正向介质压力增大时阀板斜圆锥表面与阀座密封面挤压越紧，密封效果越好。
Medium pressure increases toward the valve seat surface and oblique cone sealing surface squeeze is tightening, sealing the better.
当活塞自右向左移动时，缸内液体受挤压，压力增大，由排出阀排出。
When the piston moving from right to left, the cylinder of liquid by extrusion, the pressure increases, the discharge valve discharge.
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