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The flow is free in both directions under normal working conditions however with a sudden increase in flow from ‘B’ to ‘A’ the valve immediately stops the flow. The burst flow can be set by increasing or decreasing dimension ‘S’ to be verified during final testing of machine.The setting of ‘S’ is recommended to be 1.5 times the maximum descent flow from the actuator port to be controlled. Refer to downloads for data sheet.