Air motor

An air motor including:

• a first working chamber;
• a first piston at least aiding in enclosing the first chamber;
• a second working chamber;
• a second piston at least aiding in enclosing the second chamber;
• a central valve assembly including a base with a first valve cavity and a second valve cavity, a first movable valve member slidably located in the first cavity, a second movable valve member slidably located in the second valve cavity, each valve member being movable between a first position and a second position, inlet ducting to delivery compressed gas to the first cavity, outlet ducting to exhaust gas from the second cavity, connecting ducting between the first and second cavities, and intermediate ducting, fourth ducting providing for the flow of gas between said second cavity and said chambers, and fifth ducting providing for the delivery of exhaust gas from the second cavity;
• a connecting member connecting the pistons so that the pistons reciprocate in unison;
• and wherein
• said chambers are located on opposite sides of said base so that said base is located between the chambers, said first valve member is moved between the first and second positions thereof by the pistons, and an intermediate ducting provides for the delivery of compressed gas from said first cavity to said second cavity to move said second valve member between the first and second positions thereof so that the valve members are moved between the first and second positions thereof in a co-ordinated manner to provide for the delivery of the compressed gas to the chambers and exhaust of the exhaust gas from the chambers to thereby drive the pistons.