Water pressure test sealing method, sealing device and steel pipe water pressure testing machine

The technical problem to be solved by the invention is to provide a water pressure test sealing method, a sealing device and a steel pipe water pressure testing machine. By means of the pressure applying cavity arranged above or around the valve rod, the dynamic sealing face and the static sealing face are tightly attached, a hard face sealing mode is adopted in the sealing method, damage to sealing elements caused by impurities and residual pressure testing water is avoided or reduced, the sealing device can be used for a long time, and the service life of the steel pipe hydrostatic testing machine is prolonged. 本发明要解决的技术问题是提供一种不同于一种水压试验密封方法、密封装置以及钢管水压试验机；通过设置在阀杆上方或周围的施压腔体，使动静密封面紧密贴合，该密封方法采用硬面密封方式，避免或减少了了杂质以及试压水本身残留所导致的对密封元件的破坏，可以使得密封装置长效使用，延长钢管水压试验机的使用寿命。