Each valve is fitted with 2 pressure test points, red strap indicating upstream (high pressure) and blue strap indicating downstream (low pressure) for differential pressure measurement.
每个阀门配置2个压力测试点，红带表示上游(高压)，蓝带表示下游(低压)，用于压差测量。
2
This paper explains the image expansion and confusion of the red and blue primary colours caused by the electric charge accumulation on the oil film in the colour TV light valve tube.
本文对油膜光阀管中电荷积累现象引起的图象扩大和红、蓝原色不能正确显示的原因进行了解释。
3
Improper development of the tricuspid valve prevents oxygen-poor (blue) blood from passing from the right atrium to the right ventricle and on to the lungs as it should.