How to Distinguish the Top and Bottom of a Valve Spring?

[VanAvery]

The valve spring has one side that is more densely wound; the denser side should face downward, with the opposite side facing upward. Below is an extended introduction: 1. Introduction to Valve Springs: Valve springs are located between the cylinder head and the spring seat at the tail end of the valve stem. The function of the valve spring is to ensure that the valve closes tightly against the valve seat or valve seat ring, and to overcome the inertial force generated by the valve train during valve opening, keeping the transmission components always under cam control without disengaging. 2. Manufacturing of Valve Springs: Valve springs are mostly made of high-quality alloy steel wire and undergo heat treatment to enhance their fatigue strength. To prevent rust, the surface of the spring should be galvanized or phosphated. Both end faces of the spring must be ground flat and perpendicular to the spring axis to prevent the spring from tilting during operation.