Valve ball & seat is the key parts of the sucker rod pumps, the API code of them is V11. Its using directly decides the service life of pump.
According to the corrosion characteristics of oil wells can provide different material,API 11AX ball and seat in materials stainless steel AISI440C and hard alloy (tungsten carbide and STELLITE), with advantages of high hardness,
wear resistance, corrosion resistance. Each set ball-and-seat will be vacuum tested to ensure a perfect seal is obtained in all positions of contact.
API 11AX material table for valve ball & seat:
| CODE | INSTRUCTION | HARDNESS | MATERIAL |
| SS | Stainless steel | Ball: HRC 58-65 Seat: HRC 52-56 |
9Cr18Mo(AISI440C) 6Cr18Mo(AISI440A) |
| ST | Cobalt alloy casting | Ball: HRC 56-63 Seat: HRC 50-56 |
Cobalt, chromium and tungsten alloy |
| ST | Cobalt alloy, powder metallurgy | Ball: HRC 53-60 Seat: HRC 51-57 |
Cobalt, chromium and tungsten alloy |
| TC | Tungsten carbide | Ball: HRA 88-89 Seat: HRA 88-89.5 |
Tungsten with cobalt adhesive |
