Stimuli are signals that trigger the senses. Receptors detect the stimuli and neurons send the signals to the brain where they're interpreted. Each sense organ includes receptors that capture relevant stimuli for transmission to the brain. The receptors in the skin are mechanoreceptors and thermoreceptors.
AWWA Butterfly valves are quick opening valves that consist of a metal circular disc or vane with its pivot axes at right angles to the direction of flow in the pipe, which when rotated on a shaft, seals against seats in the valve body. They are normally used as throttling valves to control flow.
Since few of us drive around with the throttle wide openâlest we draw unwanted attentionâthe engine is forced to draw air through a partially closed butterfly valve, which creates a vacuum in the intake manifold. Your car uses that vacuum to power and control a range of auxiliary devices.