Step 2: Connect the flange head of the pressure maintaining fixture to the flange head at the end
of the first stage pipeline and install the sealing ring. Use a torque wrench to tighten the clamp screws
at the connection, with a torque of 6-8Nm.
Figure 5.11 Schematic diagram of tooling
Figure 5.12 Schematic diagram of opening ball valve
Step 3: Open the ball valve on the first stage pipe connected to the fixture (the handle of the ball
valve is perpendicular to the direction of the pipeline). Perform pressure holding operation. If the
pressure test does not meet the requirements, contact the after-sales service personnel in a timely
manner. Alternatively, the pipes inside the cabinet can be reinstalled and subjected to a pressure test
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