Hydraulic cartridge valve with activation sensor

A hydraulic cartridge valve comprising:

• a housing with a housing interior;
• a first port that passes through the housing into the housing interior;
• a second port that passes through the housing into the housing interior;
• a poppet in the housing interior, the poppet configured to move between a closed position and an open position, where the closed position blocks flow through the housing interior between the first port and the second port, and the open position allows flow through the housing interior between the first port and the second port;
• an activation sensor configured to sense when the poppet is in the open position and generate a valve open signal when the poppet is in the open position;
• an opening that passes through the housing into the housing interior;
• a diaphragm located in the opening that prevents flow to and from the housing interior, the diaphragm has an interior side that faces towards the housing interior and an exterior side that faces away from the housing interior;
• and
• a pushrod with a proximal end and a distal end, the pushrod located in the housing interior, the proximal end of the pushrod adjacent to the poppet and the distal end of the pushrod on the interior side of the diaphragm;
• wherein when the poppet is in the closed position then the distal end of the pushrod is separated from the diaphragm, and when the poppet is in the open position then the distal end of the pushrod is pushed towards the diaphragm.