3 August 2018
Control Valve Handbook: a free downloadable reference guide
Everything you need to know about control valves in one handy reference handbook
8 February 2016
Safe isolation of plant using double-block and bleed valves
A solution to ensure isolation of toxic fluids would be to use a double block and bleed ball valve arrangement that can be easily locked out and provide double isolation of the fluid along with a bleed valve to vent the space between the two valves.