A throttle valve is a device found on an automobile engine. The flow of fuel and, thereby, the amount of power the engine makes, is directly controlled by this valve. On an engine with a carburetor, the throttle valve is also referred to as the butterfly. As the gas pedal is depressed, the throttle or butterfly valve opens, allowing more air and fuel to enter the combustion chamber and resulting in an increase of power. In a fuel injection system, this valve controls the flow of air only as the vehicle's on-board computer regulates the fuel flow.
Throttle valves come in piston and needle-valve structures, but we also know them as turn plugs with axial or radial grooves. The smothering of grooves is more accurate but provides more variability than those with piston structures. The needle throttle has one disadvantage: a great deal of power is required to move the needle only a slight amount.
The pressure difference (Δp) determines the amount of flow that passes the throttle. In systems with varying loads (and therefore varying pressures), the flow passing the throttle will always be different.
You can find non-adjustable (fixed) smothering in situations where it is needed to gauge against excessive pressure surges. Also, one can find non-adjustable throttles in control systems.
Throttle is/was used about restricting airflow through a pipe/tube/duct.
It is tempting to think that the word is related to ”throat”.
With the basic, carburetor-equipped gasoline engine, you regulate the rpm (and power output of the engine) by adjusting the size of the air inlet hole into the engine. ”Full throttle” = wide open, max effort, max rpm.
And the usage stuck.
Today, throttle is also used to describe adjusting power output of a motor/ speed of a vehicle even if what’s happening has nothing to do any more with adjusting airflow. An ebike may well have a hand throttle for instance.
● Directional poppet valves
● Directional spool valves
● Check and non-return valves
● Pressure valves, relief function
● Pressure valves, reducing function
● Pressure valves, fixed throttle
● Proportional directional control valves
● Proportional pressure control valves
● Proportional flow control valves
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