Electro pneumatic and electromechanical actuated diaphragm type flush valve for aircraft toilet

A plumbing system comprising:

• a toilet bowl;
• a rinse valve coupled to the toilet bowl and configured to open in response to external activation;
• a vacuum generator configured to create a differential pressure in the plumbing system to move waste from the toilet bowl to a waste tank;
• and
• a flush valve coupled to the toilet bowl and configured to open in response to the external activation, the flush valve comprising:
• a housing having a first end and a second end;
• a piston stem extending between the first end and the second end;
• a piston stem fore end coupled to the piston stem, the piston stem fore end positioned toward the second end when in a closed position;
• a first O-ring and a second O-ring defining a control chamber therebetween;
• and
• a solenoid valve in fluid communication with the control chamber such that in an energized state, the solenoid valve charges a pressurized gas into the control chamber, pushing the piston stem toward the first end and into an open position.

A flush valve, comprising:

• a housing having a first end and a second end;
• a piston stem extending between the first end and the second end;
• a piston stem fore end coupled to the piston stem, the piston stem fore end positioned toward the second end when in a closed position;
• and
• a motor in mechanical communication with the piston stem such that the motor is configured to move the piston stem toward the first end and into an open position.