Valve and diaphragm for a pump

A diaphragm for a diaphragm pump, the diaphragm having a generally central longitudinal axis, and the pump having a pump body and a pump piston that is reciprocated relative to the body along said longitudinal axis, with said diaphragm being configured to extend between said piston and said body, said diaphragm comprising:

• a base to be fixed to the piston, the base extending angularly about and away from the axis;
• a radially outer peripheral portion to be fixed to the body;
• a flexible diaphragm portion extending between the base and said peripheral portion, said flexible diaphragm portion having a first set of segments and a second set of segments alternately spaced about said axis with respect to the first set of segments, the segments each extending angularly about and radially relative to said axis, and wherein
• the first set of segments are spaced apart longitudinally relative to said axis from the second set of segments,
• wherein said first set of segments are attached to said second set of segments by hinge portions, the hinge portions having a thickness less than thicknesses of the radially outer peripheral portion and the flexible diaphragm portion to provide for relative movement between the first set of segments and the second set of segments by resilient deformation of the hinge portions.