through bore and a shallow counterbore 34 a valve plate 36 is provided to close one end of the check valve in a conventional manner spring 40 restrained by a spring retainer 42 normally urges the valve plate 36 into position to close the valve a shank portion 44 of the spring retainer fits into the shallow counter bore 34 to align the spring retainer with the central hub 26 while providing guidance to the valve plate 36 a threaded fastener 46 is sized to engage the threaded through bore 32 of the central hub 26 the threaded fastener has a head portion 50 shown in this embodiment as a conventional bolt head but not restricted to such a head style as long as the head provided can be driven at a torque sufficient to provide extraction of the valve the inboard end 52 of the threaded fastener is provided with a working projection such as 54 which in a preferred embodiment has a diameter less than the diameter of the threaded fastener body section the tapered body 22 is installed in a mating tapered bore 54 in the pump housing the tapered bore 54 extends to a straight wall section of the same bore and to a decreased diameter section 60 that provides a shoulder 62 for restraining a valve spyder generally 64 in the straight wall section of the valve hosting bore the valve spyder 64 has a solid central hub 66 carried by multiple webs such as 70 attached to a rim 72 the rim 70 contacts the shoulder 62 and the straight bore walls the valve spyder 64 and its hub 66 are aligned with but may be.