Depend-O-Drain MDB-O-3 Drain Valve 230V 33011611

Depend-O-Drain MDB-O-3 Motorized Drain Valve (P/N 33011611 / 33011621)

The Depend-O-Drain MDB-O-3 (Manufacturer Part Number: 33011611) is a 3-inch straight-flow (180°) motorized ball drain valve designed for severe-duty fluid evacuation. Built around a robust shaded-pole synchronous drive with internal spring-assisted mechanical return, this valve operates in a Normally Open (N.O.) fail-safe configuration. When line voltage is removed—whether during a programmed dump phase or an unexpected blackout—the valve mechanism returns to full-open under spring bias to dump wash water immediately and prevent hydraulic tub overfilling.

The MDB-O-3 handles abrasive graywater containing heavy detergents, lint, caustic wash chemicals, and elevated discharge temperatures up to 90°C (194°F). It is widely utilized across offshore accommodations, marine vessel laundries, hospital sterilization facilities, and high-capacity industrial washer-extractors.

Features

1. Fail-Safe Normally Open Operation: Automatically spring-releases to full bore upon power failure, preventing unevacuated water retention in industrial drums and wash basins.
2. High-Flow 3-Inch Straight Bore: 180-degree unobstructed flow channel minimizes cycle pump-down time and drastically limits fiber, lint, and debris cavitation.
3. Chemical & Temperature Resilient Sealing: Fitted with robust EPDM/Fluorocarbon dynamic wiping seals, resistant to heavy alkalis, active bleaches, and hot graywater up to 90°C.
4. Universal 50/60Hz Field Compatibility: Precision fractional-amp motor (0.17A–0.20A) allows direct tie-in with standard marine 230V 60Hz marine switchboards as well as 230V 50Hz shoreside mains.
5. Integrated Overflow Porting: Features a factory-cast auxiliary bypass (Ø 35 mm) to safely manage tub overflow directly into the drain channel.

Applications

• Commercial & Industrial Washer-Extractors: High-capacity batch laundry washers (20 kg to 120 kg drum rating).
• Marine & Offshore Accommodations: Heavy-duty crew laundries on FPSOs, platform support vessels (PSVs), merchant shipping, and cruise vessels.
• Dairy & CIP Wash Systems: Automated clean-in-place (CIP) and milk wash tank drainage systems.
• Commercial Dishwashing & Warewashing: Flight-type and rack conveyor warewashers requiring high-volume timed gravity dump cycles.
• Industrial Gravity Evacuation Systems: Chemical mixing and rinsing tanks operating under atmospheric pressure heads.

Compatible Machine Manufacturers & Models

• IPSO: HF145, HF176, HF205, HF234, HF245, HF304, HF450, HF455, HF570, HF575, HF730, HF900, WE110, WE132, WE165, WE176, WE234, WE245, WE304, WE55, WE73, WE95
• Girbau: HS4022, LS320
• Grandimpianti: WF23, WF26, WF33, WFP50, WFP63, WR26, WR33
• Imesa: LM30, LM40, LM55, LM70, LM85, RC30, RC40, RC55, RC70
• Alliance Laundry Systems / Primus / UniMac / Speed Queen: Models utilizing 3-inch 230V straight-flow drain systems.

Part Number Cross-References

• Depend-O-Drain / Gogad: MDB-O-3, MDB-0-3, 33011611, 33011621, 33021412
• IPSO: 209/00075/00
• Danube: 422090007500, SAVZOD0112, SAVZOD0264
• Grandimpianti: 422090007500, 50GI851801
• Imesa: 2754DODNO322
• Whirlpool Commercial: 483286001251

Frequently Asked Questions

What does “Normally Open” (N.O.) mean on the Depend-O-Drain MDB-O-3?

Normally Open” indicates that without power applied, internal spring tension rotates the valve ball into the open flow position. When the machine begins a wash cycle, the control board energizes the actuator coil with 230V AC to rotate and lock the ball closed. When the cycle requires draining, power is cut, and the valve returns to the open state.

Can this 230V 50/60Hz valve run safely on a 60Hz marine electrical grid?

Yes. The synchronous drive assembly is rated for dual frequency (50/60 Hz). On 60 Hz marine shipboard switchboards, the actuator runs slightly faster through its transit cycle, maintaining nominal holding torque and rated thermal dissipation within safe operational limits.

Why does the machine tub fail to hold water when the valve is energized?

If the tub drains continuously, inspect whether 230V power is actually reaching the terminals. If power is confirmed, the issue is typically foreign object obstruction (coins, clips, scale build-up) wedged between the rotating core and seal, or a damaged gear train in the motor drive preventing full 90-degree seating.

Is the MDB-O-3 part number 33011611 interchangeable with 33011621?

Yes. Part numbers 33011611 and 33011621 represent the same base Depend-O-Drain MDB-O-3 assembly with identical 3-inch spigot configurations, 230V rating, and mounting footprint.