Valve oil is a lubricant for valves of brass instruments. It is typically mostly mineral oil with a small amount of other ingredients.

CLEANS OIL SAVES OIL FUEL SAVES MONEY
BLAST PROTECTION MEETS CORNER OFFICE .
Fluid dynamic design of a new generation of reciprocating compressor valves
Oil flow valve
Poppet check valve for controlled feeding of blowing agent
Oil flow control valves
Development of Model SC35-120A down-hole safety valve
Development and application of angle labyrinth block valve
Valve Oil
Valve Oil