Unitary elevator up level control valve

A unitary up level control valve device for a hydraulic elevator ram operating from a source of hydraulic fluid pressure comprising:

• a housing having a first partition forming an up travel supply chamber adjacent one end;
• a second partition forming a bypass chamber adjacent the other end and an inflow chamber intermediate said partitions and in communication with said source of fluid pressure;
• a check valve passage through said first partition having a check valve seat and a check valve element normally biased to seated position thereon;
• a bypass passage through said second partition having a bypass valve seat and a bypass valve element adapted to seat thereon, an up level adjustment supply line from said source;
• an up level adjustment passageway in communication between said adjustment supply line and said bypass valve and having an up level valve seat therein;
• an up level adjustment valve element normally biased in a direction to seat on said up level valve seat;
• valve guiding means for said valve element comprising a stem section on said check valve element and a stem section extending slidably through said bypass valve element to a position of engagement with said adjustment valve element and a bleed line in communication between said up level adjustment supply line and jointly with said bypass valve element and said bypass chamber;
• there being a two position up level solenoid valve device in said bleed line movable between an open position for said bleed line when said check valve is open and a closed position when said check valve and said bypass valve are partially open whereby to diminish the speed of up travel of said ram.