Flowserve HV 205 - Manual (Page 10)

10
Explanatory Notes
Description
The hydraulically operated loading and unloading system HV 205 is designed for filling
and draining stationary and mobile tanks containing pressure liquefied gases.
It is mainly used in tank cars carrying pressurized gases. These tank cars (TC) require a
high degree of reliability, ease of operation and maintenance and a long service life of the
associated valves.
The loading and unloading system consists of the two rapid-action bottom valves, the two
operating devices, the control unit, the shut-off valves, the rail hook and the tension rope.
The connecting lines required for operating the loading and unloading system are either
made of hydraulic tubes and hydraulic hoses or entirely of hydraulic hoses.
The bottom valves HWV 205/1 -DN80 are fitted to the valve-mounting flanges at the
bottom of the vessel. Both bottom valves are always opened or closed together.
A manifold connects the bottom valves directly with the shut-off valves. Both valves can
either be used for the liquid phase or the gas phase.
The operating devices consist of a hydraulic hand pump and one indicating piston for the
liquid phase and one for the gas phase. They are attached to the left and right hand side
of the tank car, which means that the bottom valves can be opened from either side of
the tank car by actuating the respective operating device.
During the loading/unloading process the rail hook connected to the tension rope keeps
the bottom valves in the open position. In the event of an emergency, e. g. emergency
shut-off or inadvertent moving of the tank car, the rail hook is disengaged from the rail
and the bottom valves close instantaneously (rapid-action closing).