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。
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.
应该小心谨慎调节测试点的方向，留出足够的空间用于压力计探头的连接。
Care should be taken regarding the orientation of the test points to give sufficient room for the manometer probe connection.
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