Patent ID: 6827327
Filing Date: 2004-12-07
Classification: G01F

Abstract:
A flow resistance setting nozzle comprisinga metallic block having formed therethrough a pipe receiving through-bore; a metallic pipe for forming a flow path which is inserted in the pipe receiving through-bore; a pressing member in the form of a rectangular cross-section bar orthogonally abutting at a center position thereof with the pipe at a first abut portion thereof; a coarse adjustment screw mounted in the metallic block to press the pressing member at the center position thereof against the metallic pipe by a coarse adjustment force generated by the coarse adjustment screw; an anvil having a distal end and mounted in the metallic block at a position opposite to the coarse adjustment screw such that the distal end of the anvil abuts the metallic pipe at a second abut portion thereof which is opposite to the first abut portion where the pipe abuts with the pressing member so that the pipe is received by and interposed between the pressing member and the anvil, whereby the pipe is squeezed by a coarse amount according to coarse adjustment force generated by the coarse adjustment screw; two fine adjustment screws mounted in the metallic block to press the pressing member at two symmetrically distant positions thereof which locate with substantially equal distances in longitudinally opposite directions of the pressing member from the center position thereof against the metallic pipe by a fine adjustment force which is obtained from combination of respective pressing forces generated by the respective fine adjustment screws and which is additive to the coarse pressing force generated by the coarse adjustment screw, whereby the pipe is further squeezed by a fine amount according to the fine adjustment force; and seal means for forming seals between the outer peripheral surface of the metallic pipe and the inner peripheral wall of the pipe receiving through-bore formed in the metallic block.