Flowserve HV 205 - Manual (Page 11)

11
Explanatory Notes
– continued –
Function
The loading and unloading system HV 205 is designed for filling and draining tanks that
contain pressure-liquefied gases.
One bottom valve opens for the liquid phase and the other opens for the gas phase. Both
opening processes always take place simultaneously.
The operating device of the tension rope (e. g. rail hook VZ 10) engaged to one of the
rails provides the required tension of the rope. This tension keeps the ball valve of the
control unit of the hydraulic system closed.
The hydraulic hand pump of the operating device BV 100 can then be used to apply
pressure to the hydraulic system. The pressure acts on the actuating cylinders of the
bottom valves, forcing the piston to go up and thereby causing the bottom valves to open.
The current lift position of both bottom valves is indicated separately by the indicating
cylinders of the operating device BV 100.
When the rail hook is disengaged, i. e. when the load on the tension rope is reduced, the
hydraulic system opens, leading to the rapid-action closing of the bottom valves within
less than 1 second.
The integrated non-return valve prevents the premature closing of the bottom valves
caused by leaking fluids in the hydraulic hand pump and the pressure-reducing valve.