卫生级球阀

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Surface Finish: TABLE SF-5 ACCEPTANCE CRITERIA FOR INTERIOR SURFACE FINISHES OF VALVE BODIES
Anomaly or Indication	Acceptance Criteria
Cluster of pits	No more than 4 pits per each 1/2 in. X 1/2 in. inspection window. The
	cumulative total of all relevant pits shall not exceed 0.040 in.
Demarcation	If < 5% of the total area when visually inspected and Ra max. is met.
Dents	None accepted.
Grit lines	If Ra max. is met.
Nicks	If depth < 0.010 in.
Pits	If diameter < 0.020 in. and bottom is shiny. Pits < 0.003 in. diameter
	are irrelevant and acceptable.
Porosity	If diameter < 0.010 in. and bottom is shiny.
Scratches	If length < 0.25 in., depth < 0.003 in., and Ra max. is met.
Surface cracks	None accepted.
Surface inclusions	If Ra max. is met and there is no liquid penetrant indication.
Surface residuals	None accepted, visual inspection.
Surface roughness (Ra)	See Table SF-6.
Weld slag	None accepted.

TABLE SF-6 Ra READINGS FOR VALVES

GENERAL NOTES:

(a) ALL Ra readings are taken across the lay,

wherever possible.

(b) No single Ra reading shall exceed the Ra

Ra max. value in this table.

upon between owner/user and manufacturer,

not to exceed values in this table.

NOTE:

(1) Or any other finishing method that meets

the Ra max.

Grit: Measures the number of scratches per linear inch of

abrasive pad. Higher numbers indicate a smoother

finish.

RMS: Defined as Root Mean Square roughness, this method

measures a sample for peaks and valleys. Lower

numbers indicate a smoother finish.

Ra: Known as the Arithmetic Mean, this measurement

represents the average value of all peaks and valleys.

Lower numbers indicate a smooth finish.

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