What role does the small spring on the throttle of a single cylinder diesel engine play?

The function of the valve spring is to ensure the seal between the valve and the valve seat when the valve is closed.

If the valve spring breaks, the diesel engine will not work normally. Valve springs are mostly cylindrical spiral springs. Most diesel engines use a spring on each valve, but the valve spring diameter of diesel engines with larger cylinder diameter is also larger. With the increase of speed, the inertia force increases rapidly, so double springs should be used.

Because the spiral directions of the two springs are opposite, that is, 1 turn left and 1 turn right, the valve can be guaranteed not to fall into the cylinder in case of spring breakage. The purpose of using two valve springs with different spiral directions, diameters and pitches is to prevent the valve springs from vibrating when they work. The valve spring must be? The diesel engine should be elastic under the condition of great changes in speed and temperature, and it should also have a natural vibration frequency much higher than the maximum speed, so that it can work at the maximum speed without * * * vibration.