8
Explanatory Notes
Scope of Supply
VZ 10
1 Rail hook
1 Installation instructions
Description
According to TRB 851 Paragraph 4.2.5.3, loading plants for combustible gases in the region of storage
facilities with a capacity exceeding 30t must be equipped with an emergency shut-down system. In
the emergency shut-down system and in other dangerous situations, the rail hook VZ10 serves as the
safety link between the loading plant and the tank car. To ensure reliable functioning, there are two
necessary prerequisites:
The hydraulic or mechanical equipment of the tank car’s bottom valve must be equipped with a
cable as per DIN 26026 or UIC 573.
The rail on which the tank car is standing must have a cross-section corresponding to DIN 5902
type S-49. If this is not the case, the rail hook can be attached to the auxiliary device U.
Function
During the loading and unloading process, the rail hook VZ 10 is stretched between the cable and the
rail (see Fig. 3) and keeps the bottom valves open. The compressed air supply is not used to open the
bottom valves (it only serves the purpose of applying a compressive force to the compression spring
C). The spring Ffor compensating height variations prevents the rail hook from being torn off the rail
during emptying of the tank car. The proximity switch Ktriggers the emergency shut-down system if
the rail hook comes off the rail because of unintentional movement of the tank car.
Danger
Only dry instrument air may be used.
There is a danger of ice formation in the compressed air cylinder.
Design
VZ 10
Rail hook with pneumatic control and proximity switch.
