Profile: Beijing JKHF Since &Tech.Co.,Ltd is a manufacturer of sealing for hydraulic tester and pipeline solutions. Internal expanding sealing components are Comprised of sealing ring, fan-shaped supporting blocks and fan-shaped angles. This sealing components are mainly used by hydrostatic testing machines for pressure testing of steel pipes. Its test head is smaller than type D or C and production cost is lower as well. It is applicable to the pressure testing of casings, tubing, natural gas pipes and other steel pipes.