Device having a sealed control opening and an orbiting valve

An improvement for a device having a housing with a stationary body and an orbiting valve selectively interconnecting fluid of two ports to expanding and contracting motor cells through bi-directional fluid passages through the stationary body of the housing of the device, and a manifold containing the bi-directional fluid passages connecting the fluid of the two ports from the orbiting valve to the expanding and contracting motor cells on a single side of the expanding and contracting motor cells with the bi-directional passages extending between such cells and the valve, the orbiting valve directly rotated by an orbiting drive shaft extending through a central opening of the device to connect to the valve with the diameter of the central opening being larger than the diameter of the drive shaft extending therethrough, a means to seal the central opening from the fluid in the orbiting valve and in that the manifold of multi-plate construction.

An improvement for a device having an orbiting valve selectively interconnecting fluid of two ports to manifold openings at a surface, and the orbiting valve having an inner opening of a certain radius about an inside drive surface and a certain orbit offset, the orbiting valve directly rotated by (A) an orbiting drive shaft extending through a central opening in the surface of the manifold and the central opening having a certain radius with the diameter of the central opening being larger than the diameter of the drive shaft extending therethrough, the improvement comprising the minimum radius of the inner opening of the orbiting valve being greater than the sum of the radius of the central opening plus the orbit offset for the device with the inside drive surface of the orbiting valve sealing the central opening in the surface of the manifold such that the inner opening of the orbiting valve never communicates with the central opening of the manifold.

An improvement for a device having an orbiting valve selectively interconnecting fluid of two ports to manifold openings at a surface, the orbiting valve having an inner valving opening of a certain radius about an inside drive surface and a certain orbit offset, the orbiting valve directly rotated by (a) an orbiting drive shaft extending through a central opening in the surface of the manifold to a drive opening in the inside drive surface of the valve, and the central opening of the manifold having a certain radius, and with the diameter of the central opening being larger than the diameter of the drive shaft extending therethrough, the improvement comprising the radius of the inner valving opening of the orbiting valve being greater than the sum of the radius of the central opening plus the orbit offset for the device with the inside drive surface of the orbiting valve sealing the central opening in the surface of the manifold such that the inner valving opening of the orbiting valve never communicates with the central opening of the manifold and by the addition of means to seal the drive opening in the valve from fluid.

An improvement for a device having an orbiting valve having a central opening selectively interconnecting fluid of a port to expanding and contracting cells, the central opening being between a central section and an outside edge connected by radial arms having a width, and the orbiting valve moving against a surface, the improvement comprising means in the surface to allow fluid to bypass the arms of the orbiting valve, said means including passages having a circumferential width greater than the width of the radial arms of the valve.