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  2. Valve oil - Wikipedia

    en.wikipedia.org/wiki/Valve_oil

    Some vendors recommend up to three different types of oil for some valve types. Slide oil for trombones is also a very similar solution. The difference between oil types is primarily the viscosity. The minerals in the valve oil are dangerous and can cause serious health problems if swallowed. Synthetic valve oils have become more readily available.

  3. Synthetic oil - Wikipedia

    en.wikipedia.org/wiki/Synthetic_oil

    A sample of synthetic motor oil. Synthetic oil is a lubricant consisting of chemical compounds that are artificially modified or synthesised. Synthetic oil is used as a substitute for petroleum-refined oils when operating in extreme temperature, in metal stamping to provide environmental and other benefits, and to lubricate pendulum clocks.

  4. Valve guide - Wikipedia

    en.wikipedia.org/wiki/Valve_guide

    The upper part of the valve stem, within the rocker box, is lubricated by oil. If this oil travels unchecked along the valve stem, engine HC emissions will become excessive. To control this, an elastomeric seal is fitted over the top of the valve guide. These may wear or stiffen with age, so are usually replaced whenever valves are removed for ...

  5. List of valves - Wikipedia

    en.wikipedia.org/wiki/List_of_valves

    Saddle valve: where allowed, is used to tap a pipe for a low-flow need; Schrader valve: holds the air inside automobile tires; Security valve, a type of automatic shut-off valve (ASV): used to stop the flow of natural gas upon sudden pressure changes. Increased pressure or decreased pressure closes the valve (without using any external power ...

  6. Valvoline - Wikipedia

    en.wikipedia.org/wiki/Valvoline

    Valvoline completed an initial public offering on the New York Stock Exchange on September 22, 2016, [10] ahead of Ashland spinning off Valvoline as an independent company on May 5, 2017. [ 1 ] On August 1, 2022, Saudi Aramco announced the acquisition of Valvoline's lubricant unit for US$2.65 billion.

  7. Variator (variable valve timing) - Wikipedia

    en.wikipedia.org/wiki/Variator_(variable_valve...

    Oil flow to the variator is controlled by a solenoid valve. When engine speed reaches a certain speed, normally 1500-2000 rpm in the Twin Spark application, the solenoid energises, causing pressurised oil to be directed through the inlet camshaft into the variator. The inlet camshaft position is advanced 25 degrees, thus increasing valve ...