Pressure Switchover M 481 C

The Pressure Switchover series M 481 C provides an uninterrupted supply of liquid or chlorine gas to the system. It assures safe and reliable switching between two chlorine gas or liquid  sources. 


Automatic pressure switchover consists of:

  • pressure switches
  • motorized ball valves
  • manifolds and bypass valves 
  • connection flanges


There are two versions of the M 481 C pressure switchover available:

M 481 C/1—with one pressure probe; controls pressure to consumption 

M 481 C/2—with two pressure probes; controls the source pressure (pressure of the chlorine supply)


Pressure switchover unit consists of two independent, electrical motor-driven ball valves, depending on version, one or two pressure probes and microprocessor controlled control panel.

Under normal operating conditions  there is always an excess pressure of approximately 6 to 7 bar (at 20°C) in chlorine cylinders or containers (drums). 

This pressure drops when chlorine is consumed. The pressure probe senses the pressure drop and the control panel initiate the motor valves to switch to the full chlorine source. 

On the control panel the operator can check the status of the operation of the pressure switchover. Depending on the version different alarms are indicated. If the switchover is malfunctioning, valves can be closed or opened manually on the motorized ball valves. 

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up to 50 kg/h  - 3/4¨ NPT 

up to 200 kg/h—1¨ NPT

Gas types :





Flange connections:

up to 50 kg/h: - with 1 probe = DN15

                      - with 2 probes = DN25

up to 200 kg/h: - with 1 probe = DN15

                       - with 2 probes = DN25

Other connections on request!