PARVEEN type actuator is a fail close hydraulic actuator. The actuator is operated by hydraulic pressure applied through a static piston on a translating cylinder. The cylinder actuated by hydraulic pressure compresses the spring by an upper spring retainer plate and directs the bonnet stem and gate into the open position. Should the hydraulic pressure within the cylinder/piston be vented, the spring arrangement ensures an instantaneous valve closure regardless of line pressure.
A spring arrangement, piston & hydraulic cylinder are assembled in a single package enclosed in housing by dual spring plates positioned within a flange and a location shoulder. The actuator assembly is easily removable from the valve for maintenance, actuator replacement, or transportation. Hexagonal screws on the lower plate & a threaded The connection between the traveling cylinder & stem keeps the actuator connected to the valve.