These are high pressure actuators which benefit from the combination of high oil pressure levels of 100 up to 135 bar - on request up to 160 bar - and small overall dimensions as well as attractive torque rates.

The HSTP-D actuator may be installed in any place - submerged in medium, in dry spaces, on deck, or in hazardous areas. The actuator needs two hydraulic supply pipes For easy installation, we recommend endless pipes (8 x 0.5 stainless steel) from coil, preferably bundled pipes, comprising two or a multiple of two hydraulic lines.

The valve position is determined by limit switches mounted externally on the actuator, or by volume transmitters installed inside the central control unit, such as the solenoid valve cabinet. The BESI volume transmitters are accepted by all major classification societies and are type-approved by Germanischer Lloyd (GL). They provide an inexpensive but very precise and reliable signal transmission and eliminate the need for any electric cabling to the valves. This ensures economic installation even in hazardous areas of a ship.

Emergency Operation

The actuators are equipped with couplings for quick connection to a portable hand-pump for emergency operation. Actuators in medium have their control blocks for manual control installed outside the tanks, and are connected by hydraulic pipes.