Mechanical lubrication steam locos. Non return valve opening pressure

[peter allen 1Participant @peterallen1]

Repairing a Club Simplex with lubrication problems .  i checked the non return valve fitted to the steam pipe to cylinders for  sealing in reverse direction and opening in flow direction using air pressure with the valve under water. Surprised to find 100 psi needed to get flow. Adjusted valve to give 10 to 15 psi opening pressure.  Out of curiosity checked a new in line oil NRV from a well known supplier and found that it would not open at 120 psi, the limit of my air supply.  Am I wrong to set the NRV at a much lower lift off pressure?

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