API-RP-576
API ICP Self Study Notes API ICP Self Study Notes
5.2 Damaged Seating Surfaces Fion Zhang/ Charlie Chong
Because there is metal-to-metal contact between the valve disc and nozzle, this area must be extremely flat, as any imperfections will lead to a process leak. The seating surfaces must be lapped to produce a finish of two to three light bands (0.000 034 8 in). Figure 8.6 shows the principle. Fion Zhang/ Charlie Chong
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Because there is metal-to-metal contact between the<br />
valve disc and nozzle, this area must be extremely flat, as<br />
any imperfections will lead to a process leak. The seating<br />
surfaces must be lapped to produce a finish of two to<br />
three light bands (0.000 034 8 in). Figure 8.6 shows<br />
the principle.<br />
Fion Zhang/ Charlie Chong
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