What is the function of a sequence valve in a hydraulic system?

The function of a sequence valve in a hydraulic system is to allow one hydraulic operation to follow another in a definite order. Sequence valves are designed to ensure that a particular operation or action occurs only after another specified action has been completed. This is crucial in applications where the sequence of operations is important for the correct functioning of the equipment or system.

For instance, in a hydraulic press, a sequence valve will permit the hydraulic cylinder responsible for clamping to engage before the one for actual pressing so that pressure is applied in a controlled sequence, preventing the possibility of equipment damage or inefficiency. The sequence valve achieves this by monitoring the pressure or flow from the upstream component and only allowing the downstream component to operate once the upstream conditions are met.

This orderly control is essential for many automated systems that rely on precise timing and operation sequences to ensure safety, reliability, and performance.