We have a lot of discussions on the definition for spile bars.
Our definition is: "Spile bars are installed in a materials handling system to positively shut-off material flow to enable the safe working beneath the spile bars. This activation of the spile bars should be possible in normal flow conditions and in failure modes, which mean that the bars should and could be activated when the material flow has stopped (this condition is also known as that the material is dead). In some instances it is also used for regulating flow"
The supplier do not agree with this definition.
Please give comments if you disagree with this definition