Static and dynamic pressure balance double flow three-way control valve

A fluid control valve, comprising:

• a housing that has an inner chamber, a first external port, a pair of second external ports;
• a spool that can move between a first position and a second position within said inner chamber of said housing, said spool having a ridge that cooperates with said housing to prevent fluid communication between said first external port and said second external ports when said spool is in the first position, and a plurality of grooves that each have a pair of opposing walls and which provide fluid communication between said first external port and both second external ports when said spool is in the second position, said spool having an inner channel and a pair of end openings that are in fluid communication with said inner chamber, wherein fluid flows between said first and second external ports such that the fluid exerts essentially equal and opposite fluid forces on said walls of said grooves;
• a first solenoid that moves said spool to the first position;
• and,
• a second solenoid that moves said spool to the second position.

A fluid control valve, comprising:

• a housing that has a first port, a pair of second ports located on each side of said first port and coupled to a first common fluid line, and a pair of third ports located on each side of said second ports and coupled to a second common fluid line;
• a spool that can move between a first position and a second position within said housing, said spool having outer grooves that couple said first port to said second ports when said spool is in the first position, and couple said second ports to said third ports when said spool is in the second position, wherein fluid flows between said ports such that the fluid exerts essentially equal and opposite fluid forces on said spool;
• and,
• a movement system that moves said spool between the first and second positions.

A fluid control valve, comprising:

• a housing that has an inner chamber, a first port and coupled to a first common fluid line, a pair of second ports located on each side of said first port, and a pair of third ports located on each side of said second ports and coupled to a second common fluid line;
• a spool that can move between a first position and a second position within said inner chamber of said housing, said spool having outer grooves that couple said first port to said second ports when said spool is in the first position, and couple said second ports to said third ports when said spool is in the second position, said spool having an inner channel and a pair of end openings that are in fluid communication with said inner chamber wherein fluid flows between said ports such that the fluid exerts essentially equal and opposite fluid forces on said spool;
• a first solenoid that moves said spool to the first position;
• and,
• a second solenoid that moves said spool to the second position.

A fluid control valve, comprising:

• a housing that has a first port, a pair of second ports located on each side of said first port and coupled to a first common fluid line, a pair of third ports located on each side of said second ports and coupled to a second common fluid line and a pair of fourth ports located on each side of said third ports and coupled to a third common fluid line;
• a spool that can move between a first position and a second position within said housing, said spool having outer grooves that couples said first port to said second ports and said third ports to said fourth ports when said spool is in the first position, and couples said first port to said fourth ports and said second ports to said third ports when said spool is in the second position, wherein fluid flows between said ports such that the fluid exerts essentially equal and opposite forces on said spool;
• and,
• a movement system that moves said spool between the first and second positions.

A fluid control valve, comprising:

• a housing that has an inner chamber, a first port and coupled to a first common fluid line, a pair of second ports located on each side of said first port, a pair of third ports located on each side of said second ports and coupled to a second common fluid line and a pair of fourth ports located on each side of said third ports and coupled to a third common fluid line;
• a spool that can move between a first position and a second position within said inner chamber of said housing, said spool having outer grooves that couple said first port to said second ports and said third ports to said fourth ports when said spool is in the first position, and couples said first port to said fourth ports and said second ports to said third ports when said spool is in the second position, said spool having an inner channel and a pair of end openings that are in fluid communication with said inner chamber, wherein fluid flows between said ports such that the fluid exerts essentially equal and opposite forces on said spool;
• a first solenoid that moves said spool to the first position;
• and,
• a second solenoid that moves said spool to the second position.