/* A  virtual valse is use by the controller :
*  - to simulate a perfect valve
*  - to stop the use of a valve when it is stuck
*/
node ValveVirtual
  state rate : [0,2] : public;
  /* information given via the controller
  *  rate different from rateReal means that this valve is stuck.
  *  so there is no need to use it any more 
  */
  flow  rateReal : [0,2];
  init  rate := 0;
  event dec, inc;
  trans rate=rateReal |- dec -> rate := rate - 1;
        rate=rateReal |- inc -> rate := rate + 1;
edon