fitting 162 referring now in particular to fig8 as either of the first and second gate faces 152 154 separate from its respective valve seat 104 106 fluid flow therepast will be relatively rapid depending upon fluid pressure due to the small annular separation distance between the valve seat and the valve stem gate 150 whereby any debris disposed thereat will be flushed away by the rushing fluid as can be appreciated by reference to fig2 the outer diameter 170 of the valve stem gate 150 is preferably less than the inside diameter 172 of medial valve body portion 110 accordingly as can be appreciated by reference additionally to fig1 the valve stem gate will not scrape the valve body 102 during reciprocation between the first and second valve seats 104 106 only sealing at a beveling or taper 108 which defines the respective valve seat additionally the medial valve body portion 110 the first distal valve body portion 112 and the second distal valve body portion 114 are cross sectionally sized with respect to that of the first second and third fittings such that fluid flow has a high flow coefficient within the valve body 102 in this regard the cross section of the first distal valve body portion 112 is larger than the cross section of the second fitting 162 such that the fluid flow passage 146 is cross sectionally sized with respect to that of the second fitting such that the.