Bidirectional fluid flow valve and method

A method comprising:

• operating a valve device to control fluid direction in a fluid inflatable support, the valve device comprising:
• a valve body having a main bore, a first port, a second port, a third port, and a fourth port, and a spindle valve, wherein the first port, the second port and the third port each comprise a hole in the valve body that is continuous with the main bore and has a center-line axis at a transverse angle relative to a longitudinal axis of the main bore, and wherein the fourth port is disposed at a proximal end of the main bore closer to the second port;
• determining if the spindle valve has moved to a position corresponding to a first state based on information from a spindle valve position sensor, wherein during the first state, the third port and the first port are fluidly connected with each other, and the second port and the fourth port are fluidly connected with each other;
• determining if the spindle valve has moved a position corresponding to a second state based on information from the spindle valve position sensor, wherein during the second state, the fourth port is closed such that the second port and the third port are fluidly connected with each other;
• and
• controlling a fluid flow generating device to evacuate fluid from or adding fluid to the fluid inflatable support through the valve device depending on the determined state.

A system comprising:

• a fluid source;
• a first valve, operatively coupled to the fluid source, comprising:
• a valve body having a main bore, a first port, a second port, a third port, and a fourth port;
• wherein the first port, the second port and the third port each comprise a hole in the valve body that is continuous with the main bore and has a center-line axis at a transverse angle relative to a longitudinal axis of the main bore;
• wherein the fourth port is disposed at a proximal end of the main bore closer to the second port;
• and
• a spindle piston coupled in a bore of the valve body and moveable between a first state and a second state to control fluid direction through the first port, the second port, the third port, and the fourth port, wherein during the first state, the third port and the first port are fluidly connected with each other, and the second port and the fourth port are fluidly connected with each other, and during the second state, the fourth port is closed such that the second port and the third port are fluidly connected with each other;
• an alternating pressure control valve operatively coupled to the first valve;
• and
• control logic operative to control the first valve and the alternating pressure control valve to provide fluid flow into the first valve and out through the alternating pressure control valve, and to obtain fluid flow through the alternating pressure valve and into the first valve.