When the credit status reflecting a corporate credit situation is quantified as the specific value of credit point, plus the value of credit point accumulated in the course of longtime online trading, it is turned out to be the credit point for this company.
A particular kind of the check valve is introduced. It is called the flange end pressure-seal piston check valve. The major components and the corresponding materials of this kind of the check valve are listed in the chart.
| NO. | Part Name | CS to ASTM | AS to ASTM | SS to ASTM | |
| Type A105 | Type F22 | Type F304(L) | Type F316(L) | ||
| 1 | Body | A105 | A182 F22 | A182 F304(L) | A182 F316(L) |
| 2 | Lift Disc | A276 420 | A276 304 | A276 304(L) | A276 316(L) |
| 3 | Pressure Seat | A105 | F22 | A182 F304(L) | F316(L) |
| 4 | Pressure Ring | A276 304L | A276 316L | ||
| 5 | Retaining Nut | A194 2H | A194 4 | A194 8 | A194 8M |
| 6 | P.S.Lock Nut | A194 2H | A194 4 | A194 8 | A194 8M |
| Suitable Medium | W.O.G.etc | W.O.G.etc | HNO3,CH3OOH etc | ||
| Sutiable Temperature | -29 425 | -29 550 | -29 180 | ||