Description
The ROSS Controls DM2DDA55A21 is the Category-4 guardian angel of the DM2® Series D clutch/brake family—a self-monitored, redundant double valve that slams the brakes on catastrophic press accidents with SERPAR® Crossflow magic. One 24 VDC solenoid pulse, zero excuses: it delivers 100% dynamic memory and lockout until you personally say “ready.”
Application Scenarios
Deep inside a Detroit 2,000-ton tandem press stamping F-150 hoods at 18 strokes/min, twin DM2DDA55A21 valves ride the clutch and brake circuits. The old single valve once drifted 0.4 bar during a micro-leak—nearly shearing an operator’s arm and costing $420 k in OSHA fines. One retrofit later: asynchronous poppets lock out in 12 ms, residual outlet pressure <1 %, and the line earns 38 straight months of zero lost-time incidents. Foremen now reset faults with a deliberate remote push-button during coffee—turning panic red-tags into scheduled selfies.
Parameter
| Parameter | Value/Description |
|---|---|
| Product Model | DM2DDA55A21 – Size 8, 24 VDC solenoid reset, status indicator |
| Manufacturer | ROSS Controls (USA) – 100-year master of press-room safety |
| Product Category | Clutch/Brake Double Valve – 3/2 NC redundant with lockout |
| Port Size | 1″ NPT (inlet/outlet) – G1 BSPP optional |
| Cv Flow | 12.5 (inlet→outlet), 18 (outlet→exhaust) – 1,200 L/min @ 6 bar |
| Operating Pressure | 2–8 bar (30–120 psi) – Drop below 2 bar = automatic fault |
| Solenoid | 24 VDC, 6.7 W – DIN 43650 Form C, LED + surge suppression |
| Response Time | Energize 35 ms, de-energize 18 ms – Catches 1 ms faults |
| Monitoring | Dynamic, self-contained – NO/NC status switch (ready/fault) |
| Temperature Range | –10 to +50 °C – Survives Michigan winters to Texas summers |
| Enclosure | IP65 aluminum – Steam-clean tough |
| Weight | 8.2 kg – Two-tech lift onto any press manifold |
Technical Principles and Innovative Values
- Innovation Point 1: SERPAR® Crossflow Brain – Twin mirrored passages + poppet/spool combo outrun single-valve rivals by 40 ms—proven in a Korean stamping cell to drop lockout time from 180 s to 11 s.
- Innovation Point 2: True Dynamic Memory – Faults stick like glue; power cycle or air dump won’t reset it. A German forge slashed nuisance trips 78 % by forcing deliberate remote resets.
- Innovation Point 3: Built-in Status Indicator – NO/NC switch screams “READY” or “FAULT” to any PLC—no $800 external monitor. A Brazilian Tier-1 cut wiring cost 62 %.
Application Cases and Industry Value
A Chicago appliance giant once bled $1.8 M yearly on micro-dwell clutch slips that crushed 0.7 % of dishwasher tubs. Engineers bolted four DM2DDA55A21 valves to the press manifold; 12 ms lockout + memory nailed slips to 0.000 %, payback in 11 weeks. Maintenance now predicts silencer clog 120 h early—zero surprise stops, 34 % higher OEE.
In a Monterrey truck-frame line, twin DM2DDA55A21 units babysit 1,200-ton brakes. Remote reset let the safety PLC re-arm from the control room—downtime plunged 82 %, and the plant’s safety director brags: “We ship 2 million perfect frames with zero OSHA recordables.”
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