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Plumbing-wise? Water, oil, gas, steam
A flow control valve is used to control and regulate the flow or pressure of fluids. A flow control valve may be used to regulate gas, steam, water and chemicals.
To adjust gas flow therefore adjusting flame intensity.
The function of a check valve is to prevent backward flow of liquid by closing. The check valves close by using fluid pressure. They are two port valves, which means there is an opening for fluid to enter and one for fluid to escape.
The purpose is to control the combustible gas flow.
An air-intake engine shut-off valve regulates air-flow to the motor, and operates as an emergency shut-off valve. There are also shut-off valves on water hoses, so shut-off valves really control the inflow of any liquid or gas.
Two inlet and two exhaust valves. Multiple valves are usually used because they provide more efficient gas (read air/fuel mixture, or exhaust gas dependent on which valves) flow than one valve of the same surface area.
There are pressure regulator valves that exist. The purpose of these pressure regulator valves is to cut off the flow of a liquid or gas when the pressure within the valve reaches a certain level.
Control of the ratio gas fuel/air in the burner.
A valve is a device that manipulates the flow of a fluid (liquid or gas) from one area to another. It can simply shut off the flow, it can increase or decrease the amount of flow, or it can reroute the flow of a fluid to a different pathway, as well as many other functions.
There are two adjustable parts on the Bunsen burner, the knob to control gas flow and the rotation of the collar to control air flow. The gas flow control, adjusts the size of the flame by controlling how much gas is burned. While the collar controls the intensity of the flame by controlling how completely the gas burns, more complete combustion the hotter the flame. These are the two parts to adjust a Bunsen burner, I hope I have answered your question.
It depends on the lawnmower some have in line valves which you should be able to see at the gas tank or close to the carb.But most just use the float to control the gas flow if it won't shut off the float is probably stuck if so try putting some good carb. cleaner threw it. Hope this helps.