Intake valve systems

A valve system, comprising:

• a housing defining an intake port, a cylinder port, a valve bore, and an extension portion extending from the cylinder port;
• wherein the intake port defining a valve seat portion at an interface between the intake port and the cylinder port;
• and
• a valve to control fluid communication between the intake port and the cylinder port;
• the valve comprising:
• a valve stem disposed within the valve bore and extending into the cylinder port and extending out of the housing, the valve stem having an open face exposed to atmospheric pressure;
• and
• a valve head coupled to the valve stem comprising a first face and an opposing second face;
• a plate member coupled to the valve stem, the plate member disposed within the extension volume, and the plate member having a first face and an opposing second face;
• and
• a pipe to provide fluid communication between the intake port and the extension volume;
• wherein the first face of the plate member is exposed to a cylinder port pressure and the second face of the plate member is exposed to an intake port pressure via the pipe;
• wherein in an open state the valve is moved so that the valve head moves into the intake port to equalize pressure between the intake port and the cylinder port;
• and in a closed state the second face of the valve head engages the valve seat portion and the first face of the valve head;
• wherein the valve is exposed to a closing force based on the intake port pressure, the cylinder port pressure and atmospheric pressure.

A valve system, comprising:

• a housing defining an intake port, a cylinder port, a valve bore, and an extension volume extending from the cylinder port;
• wherein the intake port defining a valve seat portion at an interface between the intake port and the cylinder port;
• and
• a valve to control fluid communication between the intake port and the cylinder port;
• the valve comprising:
• a valve stem disposed within the valve bore and extending into the cylinder port and extending out of the housing, the valve stem having an open face exposed to atmospheric pressure;
• and
• a valve head coupled to the valve stem comprising a first face and an opposing second face;
• a plate member coupled to the valve stem, the plate member disposed within the extension volume, and the plate member having a first face and an opposing second face;
• and
• a pipe to provide fluid communication between the intake port and the extension volume;
• wherein the first face of the plate member is exposed to a cylinder port pressure and the second face of the plate member is exposed to an intake port pressure;
• in an open state the valve is moved so that the valve head moves into the intake port to equalize pressure between the intake port and the cylinder port;
• and in a closed state the second face of the valve head engages the valve seat portion and the first face of the valve head is exposed to an intake port;
• wherein the first face of the valve is exposed to a closing force based on an intake port pressure, a cylinder port pressure and the atmospheric pressure;
• and wherein a diameter of the plate member is selected to control a closing force on the first face of the valve head.