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M35 Series Safety Exhaust (Dump) Valves

Control Reliable Modular Double Valves
Designed for External Monitoring

with or without EEZ-ON® (Soft Start) Module

M35 series
Category 4

Proven ROSS SERPAR® Crossflow technology - control-reliable,
Category 4, PL e applications, shuts-off
and exhausts even when faulted

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ROSS Controls® Announces New M35 Series Modular Double Valves View Full Article

Modular Safety Exhaust (Dump) Valve with or without Soft Start

Operation Overview

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.


With EEZ-ON® (soft start) module

With eez

Without EEZ-ON® (soft start) module

Without eez

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:

Omron logo
Pilz logo
Rockwell logo
Schmersal logo
Sick logo
Siemens logo

Standard Features

Diagram test

Valve Operation

Conditions at Start:

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.

Conditions at start

Normal operations

Normal Operation:

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.

Completion of Normal Cycle:

Simultaneously de-energizing both solenoids returns the valve to the “Conditions at Start” described above.

Detecting a Malfunction:

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.

Completion of normal

Standard Specifications

  • Design: Redundant, 3/2 Normally Closed, Dual Poppet.
  • Actuation: Solenoid pilot operated with air assisted spring return. One solenoid per valve element (2 total) – both to be operated synchronously.
  • Mounting Type: Inline mounted - modular/threaded.
  • Mounting Orientation: Any, preferably vertical.
  • Flow Media: Compressed air according to ISO 8573-1:2010 [7:4:4].
  • Inlet Pressure: 30 to 150 psig (2 to 10 bar).
  • Ambient Temperature: 40° to 120°F (4° to 50°C).
  • Media Temperature: 40° to 175°F (4° to 80°C). For temperatures below 40°F (4°C), the compressed air must be dried according to ISO 8573-3, class 7.
  • Standard Voltages: 24 volts DC.
  • Pilot Solenoids: According to VDE 0580. Rated for continuous duty.
  • Pilot Solenoids Power Consumption (each solenoid): 1.2 watts.
  • Enclosure Rating: According to DIN 400 50 IP 65.
  • Electrical Connections: Two 5-pin M12 connectors. Enclosure rating according to DIN 400 50 IP 65.
  • Pressure Sensors (2 per valve): Solid state.
  • Pressure Sensors Current Consumption (each sensor): < 23mA (each without contacts).
  • Monitoring: Dynamic, cyclical, external with customer supplied equipment. Monitoring should check state of both valve pressure sensors with any and all changes in state of valve control signals.
  • Minimum Operation Frequency: Once per month, to ensure proper function.
  • Functional Safety Data: Pending.

This valve is not designed for controlling clutch/brake mechanisms on mechanical power presses, see DM2® Series D valves for mechanical power press applications.

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ROSS Controls® Announces New M35 Series Modular Double Valves View Full Article
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