1. Normally closed intake valve, controls pressure input, and opens the intake valve;
2. The entire intake valve adopts a piston type check structure, which will not spray oil during emergency shutdown conditions;
3. The intake valve can be equipped with an optional unloading and air replenishment function, effectively eliminating cavitation noise generated by the main engine;
4. The intake valve integrates a relief valve, a makeup valve, and an inverse proportional valve, with standard accessories: solenoid valve and filter.