Valve Features
| FEATURES | OPTIONS AVAILABLE | |
|---|---|---|
| CASTINGS | All castings used are investment castings and only for large size UNP uses sand castings. Investment castings are used to obtain homogeneous and intact lining quality with uniform lining thickness which provides UNP valve a reliable lining quality and long lasting performance. | ASTM A216 GR.WCB
ASTM A351 GR.CF8 ASTM A351 GR.CF8M ASTM A352 GR.LCB OR LCC ASTM A890 GR.4A (CD3MN) ASTM A494 HASTELLOY C276 / C 22 |
| TRIM INSERTS | UNP through its stringent design considerations has taken both the aspects of corrosion resistance and mechanical strength. Considering high torques in case of butter”y and plug valves UNP decided to use ASTM A890 GR. 4A(CD3MN) duplex material to obtain high MAST (Maximum Allowable Shear Torque) values ensuring intactness of plug and disc shafts even at higher operational torques. For other valves UNP uses trim inserts at higher grade of metal as ASTM A351 GR.CF8. | ASTM A351 GR.Cf8
ASTM A351 GR.CF8M ASTM A890 GR.4A (CD3MN) ASTM A494 HASTELLOY C276 / C22 |
| BODY BOLTS | UNP uses allen bolts or stud & nut combination and high tensile body bolts are used considering its mechanical as well as corrosion aspects | SS 304
SS 316 ALLOY 20 ASTM A193 GR. B7 & A194 GR. 2H ASTM A494 HASTELLOY C276 / C22 MONEL |
| LINING MATERIALS | UNP uses 100% virgin lining materials and is buying directly from the sources such as dyneon, chemours, solvay, llyondell basell etc. ensuring that the best and uniform quality of lining is done for UNP valves ensuring high reliability in terms of life and performance. | PFA
FEP ETFE PVDF ECTFE PPH |
| PAINTING OF VALVES | UNP has best painting technique and is using two part epoxy paint with proper paint procedure of 1stcoat of epoxy primer and 2nd & 3nd coat of epoxy paint with minimum DFT of 150 microns.Painting is most important in the UNP valve as it provides protection against most corrosive environment making the valve to survive against most corrosive environment and provides metal a very long life. | TWO PART EPOXY POLYEURATHENE OR ANY OTHER PAINT WITH DIFFERENT RAL CODES. |
