BOLT SCIENCE, based in the UK, released the sixth edition of BOLTCALC software in early 2012. In addition to providing bolting solutions, consulting tasks and testing services, the bolt specialists also write professional software for selling bolted joints and train engineers in the field of bolts. The sixth edition of the BOLTCALC software is mainly used to analyze bolt-on loads, thread removal and torque tightening. For details, please refer to its website. Gate Valve Series,Bronze Gate Valve Flanged,Double Flange Sluice Valve,Double Flanged Gate Valve Wenzhou KAIZHENG Valve Technology Co.,LTD. , https://www.kazevvalve.com