Regulator does not deliver in its designed delivery pressure range. Repaired with incorrect adjusting spring or spring button. Replace the adjusting spring or spring button. Repaired with incorrect adjusting screw. Replace the adjusting screw.
Relief valve opens greater or lesser than marked pressure.
Repaired with incorrect adjusting spring. Replace the adjusting spring. Defective L.P. gauge. Replace the L.P. gauge. Increase in the L.P. gauge reading.