... . The pictures below designed before are served as reference.Emergency Shut Down Valves (ESDV) ensure the safety of your ... operations by closingautomatically in case of emergency,PST .ESDV Shut down valve's feature•Compact design with unique mini ... decades of effort, the company hasformed a gate valve, ball valve, butterfly valve, globe valve, check valve, plug valves, control valves, etc. asthe ...