🔍 Key Concepts

• Trace the opening water (V15) and closing water (V16) lines in the illustration and see which side of the operating slide they act on. • Determine how sealing water (V10) and the water outlet (V5) affect the water level and pressure below the sliding bowl after ejection. • Think about what hydraulic condition is needed for the sliding bowl (a) to move UP and close versus DOWN and open for sludge discharge.

💭 Think About

• Right after sludge has been ejected, do you want pressure acting on the opening side or the closing side of the operating slide? Which valve positions will create that condition? • If V5 (water outlet) is open, what happens to pressure in the operating water spaces? If it is closed, what happens? How would that affect the bowl position? • Does sealing water (V10) need to be present, absent, or draining at the instant you want the bowl to re‑close and re‑establish the water seal?

✅ Before You Answer

• Verify on the diagram which valve sends water to the lower chamber that lifts the sliding bowl to the closed position. • Confirm which valve, when open, relieves pressure (drains water) so the bowl can drop and open, and which must be shut to allow pressure to build back up. • Before choosing, check that your valve combination both (1) supplies water to the closing circuit and (2) does not keep supplying water to the opening side or venting the system.