The culmination of ROSS double valves DM2®D series
DM2® series size development
(1) Built-in dynamic monitor for all sizes
- Failure detection
- Failure signal output (status indicator *described later)
- Restart prevention function
(2) Equipped with square silencer as standard
Features ( 1 ) Base mount specifications
The DM2® series is a [valve body + piping base] specification.
It is possible to replace only the valve body while leaving the piping base.
Feature ( 2 ) Dynamic monitoring
dynamic monitor
A monitoring method that monitors the operating status of the valve each time and enables the next operation only when safety can be confirmed .
The dynamic monitor , which monitors every time , dramatically improves safety against dangerous failures.
dynamic memory
After failure detection, the state is maintained to prevent restart .
Since it can be restarted only by regular reset operation (both solenoid demagnetization/supply pressure secured/reset operation for about 1 second), it prevents unexpected press start-up due to operator's procedural mistakes or skipped steps. ( dynamic memory )
(2) Internal structure and operation -1. Before startup (operation ready state)
Ready position
- Both discs are in the closed position (operation ready position).
- The air tanks (left and right) for the pilot valve are pressurized.
(2) Internal structure and operation -2. Normal operation
normal process
Energize the solenoid coil → Air for the pilot valve passes through the pilot valve.
→The main piston is pushed down (both valves open), and the IN side air flows into the OUT side.
(2) Internal structure and operation -3. Failure to return to one side of the valve body
Failure process
One side of the valve body fails to return → OUT side air is exhausted and the machine stops.
→ The air for the pilot valve of the “normal valve” is exhausted due to the return failure on one side .
The failure side (left side) maintains the return failure position as it is (=restart prevention state).
Since both main valves must be in the operation ready position (closed position), the operating condition of the valve is
The DM2® series will not operate in the return failure state (not in the closed position = safety cannot be confirmed) .
(Even if power is supplied in this state, the main piston will not open because the pilot air on the normal side is exhausted.
*The double valve does not pressurize the OUT side unless both valves are open = the machine does not move)
(2) Internal structure and operation -4. Reset operation
Valve reset process
(While supplying air to the IN side) Solenoid coil energization OFF→ ①Input reset air
→(2) Both pilot air is exhausted →(3) Both return pistons pressurize → Returns both main valves to the ready position (closed position) .
After resetting, the air tanks for the pilot valve (left and right) are repressurized,
When both discs return to the operation ready position (safety confirmation) , the valve will operate the next time power is supplied.
(2) Internal structure and operation -5. Status indicator (failure signal output function)
When asynchronous operation such as valve return failure/operation delay occurs
A status indicator outputs a fault signal .
Feature ( 3 ) Low temperature support
Ambient temperature
CF series: 4 to 50℃
DM2® series: -10 to 50℃
Stable operation can be expected, especially in winter or at the beginning of work after vacation.
Feature (4) Low power consumption
Power consumption (each solenoid)
CF series
- 50/60Hz: Starting 87VA or less / Holding 30VA or less
- DC: Starting 4W/Holding 14W
DM2® series
(Size 2,4,12,30)
- 50/60Hz: 5.8W nominal, 6.5W maximum
- DC: nominal 5.8W, maximum 6.5W
(size 8)
- 50/60Hz: Starting 36VA/holding 24.6VA or less
DC: Start 15W/Hold 15W
Feature ( 5 ) Third-party organization (* DGUV ) certification
* 3rd party certification of DGUV Test
Get Performance Level PL “ e ”
It also supports Category 4 ( Cat. 4 ) .
* German statutory accident insurance
2 . International Standard for Clutch / Brake Valves
The DM2®serieswith a built-in dynamic monitor supports Europe, Canada, and Brazil, which have high safety requirements.
It is safe to relocate presses across countries.
Excerpt from ROSS CONTROLS internal document, reorganized
**Situation as of August 2021. This is a reference material because stricter safety requirements may be required depending on the on-site inspection.
For overseas use, we recommend the DM2 series.
***In 2019 ISO 16092-2: Safety requirements for mechanical presses were published, specifying valve monitoring functions.