Providers of materials to restore and maintain Stanley Steam Vehicles

255A Check Valve Ball, Delrin 500, 7/16" dia.


A 7/16” diameter, high precision, grade 2, DuPont acetyl polymer check valve ball to replace those noisy metal balls in your power water pump circuit.  These balls will reduce pump noise, extend valve seat life, and preserve lift distance.  

Not for use in boiler check valves or where temperatures will exceed 275 F as Delrin will melt at boiler water and steam temperatures. 
On newly machined check valves use metal balls for a few hundred miles to burnish the seats and then switch to Delrin for long seat life and reduced noise.