How does the quick-shut component 2200 function?

By opening the sliding valve, the flow of oil is altered

The start oil directional valve, with tag number 1843, and the quick-shut oil directional valve, with tag number 1842, are both knob-type directional valves; together with the auxiliary spool valve (9) and the cartridge valve DG16, they are used to operate the quick-shut valve locally. The auxiliary spool valve (2200) is a combination of a hydraulic check valve, a filling valve, and a cartridge valve; before startup, both the cartridge valve in 2200 and DG16 are in the closed state. At startup, first rotate the knobs for 1842 and 1843 counterclockwise (as viewed from above) by 90° to establish a path between P and B of 1843; this allows the starting oil F to create pressure. As F flows toward the quick-shut valve, it also reaches the auxiliary spool valve and, via the hydraulic check valve, enters the filling valve, causing its return port to open. The return flow in the cartridge valve of 2200 causes this valve to open under the action of the pressure oil, which then flows toward 1842. At this point, paths are established between P and B as well as A and T in 1842, and the pressure oil enters DG16, which remains closed. The pressure of the quick-shut oil E2 is 0 at this stage. When the pressure of the starting oil F reaches ≥0.6 Mpa, the knob for 1842 should be rotated clockwise by 90° to reset the quick-shut oil directional control valve in 1842; this establishes paths between P and A as well as B and T in 1842, allowing DG16 to open and generate quick-shut oil. Once the pressure of the quick-shut oil E2 reaches ≥0.6 Mpa, it is necessary to reset the starting oil directional control valve (by rotating it 90°), which closes the P port of 1843 while establishing a path between B and T. As a result, the starting oil begins to flow back. Since the return port of 1843 is equipped with a throttle orifice plate and an adjustable needle valve (located on the upper left side of the operating side A), the quick-shut valve gradually opens as the starting oil flows back slowly. During the reset in 1843, since pressure had been established by the quick-shut oil, this oil took over from the starting oil to control the filling valve in 2200, keeping its return port open; as a result, the corresponding cartridge valve remained in an open state at all times. During the operation of the unit, once the quick-shut oil pressure drops, the return port of the filling valve closes, and the corresponding cartridge valve closes as well, thereby blocking the P-E 2 path and causing the quick-shut valve to close and the unit to stop operating. The tag numbers of the shutdown solenoids (5, 8) are 2222 and 2223 respectively; they are used for remotely shutting down the turbine. The solenoid valve shown in Figure 2 is in a de-energized state; during startup and normal operation, the pressure oil in 2222 and 2223 allows flow, while the DG40 cartridge valve closes under the action of this pressure oil. When either 2222 or 2223 is energized, the upper chamber of DG40 is connected to the return oil, causing DG40 to open. The quick-shut oil is then rapidly discharged, which leads to the closure of the quick-shut valve and the shutdown of the turbine.

Is there a complete set of instructions? The manufacturer on our end hasn’t provided them; we’re trying to get them

Similar to a self-locking valve, it closes when the starting oil pressure is established, and opens to allow oil to flow out when the control oil pressure drops; thus it functions as a control for the oil pressure