... positioned plug valve 定位旋塞阀 positive valve 正压阀 positive-displacement metering valve 容积式计量阀; 步进式计量阀 ...
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positive valve gear 强制式阀门机构
positive valve terminal 刚性阀终端
positive-displacement metering valve 容积式计量阀 ; 步进式计量阀
positive crankcase ventilation valve 曲轴箱强制通风阀
DO NOT TRIM any excess gasket material, it will seat itself after bolting the valve into the pipeline, thus providing a positive seal.
不要修正任何多出的垫圈材料，这些多出部分会在将阀门用螺栓锁到管道后重新回到正确的位置，从而实现正常的密封。
When returning empty cylinders, close the valve before shipment. Leave some positive pressure in the cylinder.
返还空瓶时，在运输之前关闭阀门，使钢瓶内部保持 正压 。
The present paper introduces the optimized design of valve springs of the internal-combustion engine by the duality method of the geometric programming with the positive term equations of constraint.
本文对内燃机汽门弹簧进行优化设计，采用了约束正定式几何规划对偶法。
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