Many pressure dominated testingvalve is through pumping of relieving annulus pressure to realize open or shut down hole test valve and keep annulus pressure for certain all the time.
许多种压控测试阀均是通过环空加泵压打开，泄掉泵压关闭，开井过程中环空始终保持一定的开启压力。
2
Secondly, testing the exterior wall's heating transfer coefficient in tier building, the differences between testingvalve and design value is about 8.43%, and analysis the reason of the error.
其次对一栋多层建筑的外墙传热系数进行了测试，测试值和设计值相差8.43%，并分析了产生误差的原因。
3
Adjustments for envelope squeeze on seats and valvetesting are done by machine during factory assembly.