Control Reliable Modular Double Valves
Designed for External Monitoring
with or without EEZ-ON® (Soft Start) Module
The M35 Series valve is designed to supply air to a zone or entire machine/system until signaled to shut off and exhaust residual downstream pneumatic energy from the machine. Thus, reducing the hazards associated with the presence of residual energy during employee access and/or minor servicing. The safety function of the M35 Series valve is to shut off supply of pneumatic energy and to exhaust any pneumatic energy from downstream of the valve. Note that the M35 series valve cannot exhaust pneumatic energy from downstream of obstructions such as check valves and closed center function valves.
The M35 Series valves are designed for external monitoring for safe, redundant operation of the valves. The M35 Series valves are constructed of redundant, 3/2 poppet type valves, and have an overall function of a single solenoid pilot-operated, spring return valve. Each single valve in the M35 Series valve is equipped with a solid state pressure sensor. Monitoring both of these sensors on each actuation and de-actuation of the M35 valve provides a diagnostic coverage of 99%. Monitoring of these sensors is to be done by an external monitoring system.
Compatible monitoring systems available from the following electrical controls manufacturers:
Inlet 1 is closed to outlet 2 by both valve elements A and B. Outlet 2 is open to exhaust 3. Pressure signals at both sensors SA and SB are exhausted. Sensors outputs SA and SB are on.
Simultaneously energizing both solenoids actuates both pilots and causes valve elements A and B to shift. Inlet 1 is then connected to outlet 2 via crossflow passages C and D. Exhaust 3 is closed. Sensing pressure signals go to each pressure sensor and become equal to inlet pressure. Sensors outputs SA and SB are off.
Simultaneously de-energizing both solenoids returns the valve to the “Conditions at Start” described above.
A malfunction in the system or the valve itself could cause one valve element to be open and the other closed. Air then flows past the inlet poppet on valve element A, into crossflow passage D, but is substantially blocked by the spool portion of element B. The large size of the open exhaust passage past element B keeps the pressure at the outlet port below 2% of inlet pressure. Full sensing air pressure from side A goes to sensor SA, and a reduced pressure goes to sensor SB. This full pressure signal causes sensor outputs SA to turn off. Sensor outputs SB, with a reduced pressure signal, does not turn on. An external monitoring system can detect the malfunction by monitoring the condition of the sensors SA and SB. The external monitoring system may then react accordingly by shutting down the power to the valve solenoids and any other components deemed necessary to stop the machine.
This valve is not designed for controlling clutch/brake mechanisms on mechanical power presses, see DM2® Series D valves for mechanical power press applications.View Products