Pressure tight valve seat for valves consisting of two opposing tubes

A fluid jet transfer valve comprising:

• two tubes with at least one of the tubes being a cantilevered tube, the cantilevered tube having a stationary end and a movable end, each of the two tubes having an open end with the movable end of the cantilevered tube also being the open end, and with the open ends being positionable to engage each other;
• a source of pressurized fluid connected to one of the tubes;
• a lateral deflection means for producing relative movement between the open ends of the tubes with the movements of the tube ends being restricted to paths which lie within a single plane surface and which are approximately arcs of tangent but non-overlapping circles with the arcs passing through a central point where the open tube ends are coaxially aligned with each other;
• tube end surfaces on each of the open tube ends with the positions of the tubes adjusted so that the open tube ends will be in firm contact when coaxially aligned with each other, with the tube end surfaces tilted so that the open tube ends will be free to move apart without binding against each other, with the tube end surfaces formed with complementary shapes so as to produce a tight seal between the two open tube ends when they are coaxially aligned with each other and with almost all of each said tube end surfaces on each said open tube end being positioned along the intersection of the tube with two semi-cylindrical surfaces which are perpendicular to the plane surface within which the open tube end moves when it is laterally deflected, with approximately half of each tube end surface being concave relative to the rest of the tube and approximately half of each tube end surface being convex relative to the rest of the tube such that the tube ends may move away from each other in one direction but cannot pass each other.