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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| HG 20519.33-1992 |
(Piping layout and isometric drawings on pipes, fittings, valves and pipe special pieces legend) |
China Chemical Industry
Standards Special valves |
 English PDF |
| HG 20519.21-1992 |
(Special valves and piping accessories table) |
China Chemical Industry
Standards Special valves |
English PDF |
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