Rupture disk pressure relief assembly for a paint pump

A piston-type paint pump, comprising:

• a paint-pumping chamber;
• an inlet port in fluid communication with the paint-pumping chamber and configured for interconnection to a source of paint;
• an outlet port in fluid communication with the paint-pumping chamber and configured for interconnection to a paint sprayer;
• a pressure relief port in fluid communication with at least one of the outlet port, paint-pumping chamber and the inlet port;
• a piston assembly mounted for reciprocal motion within the paint-pumping chamber;
• a motor driving the piston assembly to draw paint into the paint-pumping chamber through the inlet port, and to pressurize and force the paint from the chamber through the outlet port;
• and
• a pressure relief assembly in fluid communication with the pressure relief port for venting the pressure relief port to atmosphere when the pressure within the port reaches a predetermined level the pressure relief assembly including:
• a rupture pad extending over the pressure relief port and forming a rupturable seal between the relief port and atmosphere;
• an annular rupture pad-engaging face forming an aperture having an inner diameter surface (and where a radiused and smooth transition surface extends) between the face and inner diameter surface;
• and
• a mounting member removably secured to the paint pump for mounting the rupture pad between the pressure relief port and the rupture pad-engaging face, to seal the pressure relief port until a predetermined rupture pressure is exceeded and thereafter to vent the pressure relief port to atmosphere.