Patent ID: 8397742
Filing Date: 2013-03-19
Classification: E21B,F15B,F16K,Y10T

Abstract:
1. A valve comprising: a) a body having an axial bore, a pair of first and second fluid flow inlet ports to said bore, and a fluid pressure function outlet from said bore, said outlet being transverse to said bore between said inlet ports, said bore widening proximate said outlet to form shoulders flanking said outlet; b) a shuttle coaxial with said bore and having: c) at least one first soft seal fixed on either the outer periphery of said shuttle first end portion or the inner periphery of the axial bore on its first inlet port side, for sealing an annulus between said outer periphery of said shuttle first end portion and the inner periphery of the axial bore on its first inlet port side when said collar engages the shoulder on the first inlet port side of the axial bore, d) at least one second soft seal fixed on either the outer periphery of said shuttle second end or the inner periphery of the axial bore on its second inlet port side, for sealing an annulus between said outer periphery of said shuttle second end portion and said inner periphery of said axial bore on its second inlet port side when said collar engages the shoulder on the second inlet port side of the axial bore, e) said soft seals being placed sufficiently distally outwardly from said shoulders in the direction of said inlet ports and said end portions extending for a distance from said collar, such that: