spring low lift external screw safety valve

Detailed Product Description

  spring low lift external screw safety valve

   Product details
A21FA21H-C type are used for the equipment and pipeline of the with air,ammonia and LPG etc, A21W-PR type are working temperature are less than200 ^oCwith Corrosive medium,it take for extra pressure protection devices.and KA21Y type are used for working temperature are less than 100^oC with LPG ect
  Materials for main parts
NO.   name of part     A21H-C/A21F Materials    A21W-P/A21F-P Materials      A21Y-R Materials
1      Pipe joints               20                  1Cr18Ni9Ti                   1Cr18Ni12Mo2Ti
2      Nipple nut                35                     2Cr13                       1Cr18Ni9Ti
3       Nozzle                   35                   1Cr18Ni9Ti                   1Cr18Ni12Mo2Ti
4       Body                   2Cr13                  1Cr18Ni9Ti                   1Cr18Ni12Mo2Ti
5       Disc             2Cr13/2Cr13+PTFE     1Cr18Ni9Ti/1Cr18Ni9Ti+PTFE           1Cr18Ni12Mo2Ti
6      Spring seat             2Cr13                  1Cr18Ni9Ti                   1Cr18Ni12Mo2Ti
7        Spring             50CrVA                           50CrVA Coaled Teflon
8      Lock nut                Q235-A                 ZG230-450                     1Cr18Ni9Ti   
9    Spring direct mat       2Cr13                 1Cr18Ni9Ti                    1Cr18Ni12Mo2Ti    10  Adjusting screw nut       Q235-A                  2Cr13                        1Cr18Ni12Mo2Ti    Sealing face of material   "Y"Depositing stellite,"H"Depositing D507,"W" shape for the valve body