YKA is made of cylindric heat-exchange block of graphite, head of graphite and the sealing rings among them, main body of heat-exchanger is in laminated assembling for building block type is for laminated assembling in building blocks type by metal cover plate tie rod and spring tie rod and spring. The equipment adopted PTFE O-type sealing ring instead of binder in the structure, spring of impressed pressure, as the automatic compensated structure for the expanding with heat and contract ing with hold, use short passage, to increase turbulence effect by added redistributed room , make the heat xchanger to have higher strength, temp-proof, pressure-proof, good resistance to impact, small volume and higher utilization, convenient to be checked, hence, this kind of equipment belong to the more advanced and excellent ideal graphite heat-exchanger, especially for heater, reboiler, condensor. (2) Technical Parameters Permissible Temperature: -20 ~ 165 165deg.c Permissible Pressure: Vertical 0.4MPa, Horizontal 0.4Mpa.