The suction valve ball is inside the chamber and opens with each attract from the plunger. The discharge valve ball is exterior the chamber and opens if the oil is pushed in to the cylinder. At this time the suction ball throughout the chamber is pressured shut and oil pressure https://autobodyandrepairnearme63834.blogs100.com/27711038/types-of-hydraulic-jacks-things-to-know-before-you-buy