Flowserve VZ10 Pneumatic Rail Hook - Manual (Page 8)

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 30 t must be equipped with
an emergency shut-down system. In the emergency shut-down system and in other
dangerous situations, the rail hook VZ 10 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 .
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 . The spring for
compensating height variations prevents the rail hook from being torn off the rail
during emptying of the tank car. The proximity switch triggers 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.
U
C
K
F