UNITARY ACTUATOR VALVE FOR DOWNHOLE OPERATIONS

Air motor and pump comprising such a motor

Harmonic uniflow engine

Double-reed exhaust valve engine

Method to prevent debris build-up on reciprocating air motor pilot valves

Automatic pneumatic valve reset system

Energy conversion devices and systems including the same

AIR OPERATED DOUBLE DIAPHRAGM OVER CENTER VALVE PUMP

Internal combustion engine with dual-chamber cylinder

HEAT ENGINE

Energized Fluid Motor and Components

Fluid pressure operated piston engine apparatus and method

High efficiency steam engine, steam expander and improved valves therefor