8
Name plate
The following items are indicated on the name
plate:
Manufacturer
Type designation
CE marking
Date of manufacturing
ATEX classification
With type VZ 10 equipment, the admissible air
pressure is stated on the rating plate.
Task and function
The rail hook is used for automatically closing the
rapid-action bottom valve (24) of railway tank cars
(22) if the tank car rolls away. Together with the
rapid-action bottom valve, it forms an internal
rapid-closing shutoff mechanism that acts as safety
equipment during the carriage of liquefied
flammable gases. This safety equipment fulfils the
requirements of the RID, section 6.8.3.2.3, for
filling and discharge systems for liquefied
flammable or toxic gases with a capacity of over
1 m
3
.
The rail hook has a PTFE fire shield. The hook
releases in the event of a fire.
The VZ 10 rail hook features a proximity switch that
enables automatic remote triggering when
connected to an I&C system.
In order to function as safety equipment, the
following conditions must be satisfied:
The bottom valve of the tank car must be
equipped with a cable (25) to DIN EN 12561-3.
The rail (12) must conform to DIN EN 13674-1
(e.g. profile 49 E 1).
If the rail does not satisfy this condition, as an
alternative the equipment may also be attached via
a suitable auxiliary device (26).
The rail hook is stretched between the cable (25)
and the rail (12) during filling and emptying. It
keeps the actuator (23) of the bottom valve (24) in
the open position. The cable is attached to the hook
(4) of the rail hook.
In the VZ 10, the nose is tensioned by compressed
air. In the VZ 20, the nose is tensioned by a spring.
In the event of danger, the I&C system releases the
cylinder so that the pneumatic VZ 10 is detached
from the rail.
The mechanical VZ 20 is pulled off the rail by
pulling the slack rope in the event of danger. The
slack rope is not included in delivery.
