Definition - What does Petcock mean?

Petcock is a small valve that is used to control the flow of gas and liquids in engines. The working of the device remains the same as a boiler hence it is used to drain off the unwanted materials from internal combustion engines. Depending on the requirements, it can be installed in the fuel system or in the radiator. The valves have different designs though they all work on the same principle.

Petropedia explains Petcock

A Petcock is generally located beneath the fuel tank of vehicles and it determines the flow of the oil in the system. There are various kinds of Petcocks, and they include, vacuum operated, electric shut off, remote vacuum valve, and manually operated valve. Petcocks have three positions, open, closed and full.

A Petcock offers a number of benefits such as:

  • It checks the water level from the cylinder of a steam engine.
  • It drains out waste materials from an internal combustion engine.
  • It regulates and maintains the flow of gas between a carburetor and a fuel tank.
  • It makes the vehicle’s coolant system work efficiently.

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