A valve apparatus and pneumatically driven diaphragm pump incorporating
same having a valve body having a longitudinal axis and an actuator
having an axis with a first end and a second end. The first and second
ends have first and second diaphragms, respectively, disposed thereon and
located transversely to the axis of the actuator. Upon inserting the
actuator into the valve body, the first and second diaphragms define wall
portions of first and second chambers at the first and second ends of the
axis of the actuator, respectively, and a chamber defined between the
diaphragms.