1828 24 Nov. 4/5 (advt.) A superior single-lifting Engine..with copper casings, pump valves, &c.
1844 7 190/2 A model, showing the principal pump valves used by mining engineers.
1858 P. L. Simmonds Pump-valve, the moveable interior part or lid of a pump.
1939 Nov. 462/2 The pump valve designs are quite satisfactory for modern use.
1994 May 68/1 The problems of choked strainers, overloaded mud-boxes and stuck pump valves, not to mention consequential engine damage.