in an embodiment the second seat closure is substantially frustoconically shaped the closure is movable with the shuttle along a line substantially parallel to a centerline of the valve body 301 located near the upper valve body section 350 is a third seat 368 in an embodiment the third seat is about radially oriented with respect to the valve body centerline 301 about radially arranged and located between the second and third seats 318 368 are one or more spill ports 316 extending between a valve body exterior 372 and the valve body central chamber 323 a third seat closure 367 is located at a shuttle 337 upper end in an embodiment the third seat closure is located on a peripheral sloped face of the shuttle 319 in various embodiments the third seat closure is spherically shaped conically shaped elliptically shaped or shaped in another manner known to persons of ordinary skill in the art and in an embodiment the second seat closure is substantially frustoconically shaped the closure is moveable with the shuttle along a line substantially parallel to a centerline of the valve body 301 the second and third seat closures 317 367 are formed to substantially simultaneously close the second and third seats 318 368 when resting against the second and third seats 318 368 the second closure establishes a flow path between a variable volume valve chamber below the shuttle 362 and an upper valve.