What is the minimum pressure valve for?

1, the minimum pressure at the valve is a buffer effect, the moment when the machine is loaded, we assume that the emission into the atmosphere, large pressure before separating the interior of the machine will be generated after the separation of all applied to the separator, the separator core to cause injury; 2, the machine is lubricated by the oil pressure difference for the machine itself, no additional auxiliary pumps, when the machine is in the idling state, still maintaining a constant pressure cycle, the intake valve is relatively closed, but the minimum pressure valve to prevent pressure leak , thus ensuring that the lubricating oil circulation.