The 17-4 is a harder material, but the 316 has better chemical resistance. This smooth, hard plunger will greatly enhance seal life. The cost of a ceramic plunger is higher than those made out of 17-4 and 316 SS, however we are confident the plunger will last longer.
Some miscellaneous parts are still available.
The discharge pressure must be greater than the process pressure to be able to positively inject into the process line. It is recommended that the discharge pressure be 200 PSI above the process pressure. Amplification ratio is the difference in the surface area the surface area between the air piston and the fluid plunger. The greater the difference in surface area, the larger the amplification ratio and corresponding higher pump discharge pressure. You should only use the minimum air supply pressure that will overcome the process pressure.