Loading of Valve

Load Steps

Pressure Run

Remarks

Step 1

Pre-tension load in valve thread, (pressure = 0.0 MPa)

One event

Step 2

Autofrettage pressure applied (650 - 1425 MPa)

One event

Step 2

Min pressure cycle (0.875 MPa)

Pressure cycle

Step 3

Max pressure cycle (87.5 MPa)

Step 4

Min pressure cycle (0.875 MPa)