Flowserve EV 30 - Manual (Page 12)

12
Explanatory Notes
System Description
The bottom loading system EV 30 consists of EV 30 DN 125 mm type F for liquid
phase and EV 30 DN 80 mm type G for gas phase (gas balance pipe) and is used in
mobile tanks, e. g. rail tank cars.
The system meets the requirements of the following rules:
■ GGVE/RID Appendix XI
■ TRT 024, TRT 006, TRT 30
Scope of Supply
EV 30 DN 125 mm type F for liquid phase consisting of:
1 Valve mounting flange DN 125/150 mm (on request)
1 Bottom valve UV 70 DN 125 mm
1 Operating mechanism BV 50 DN 150 mm
1 Manual operating mechanism for EV 30
EV 30 DN 80 mm type G for gas phase consisting of:
1 Valve mounting flange LV 50 DN 80 mm (on request)
1 Vent valve LV 50 DN 80 mm with operating rod
1 Vacuum breaker FV 10
EV 30 DN 125 mm type F and EV 30 DN 80 mm type G can also be used singly.
Function
The bottom valve UV 70 DN 125 mm serves as first internal shut-off according to
GGVE/RID. The opening mechanism for the bottom valve UV 70 is incorporated in
the operating mechanism BV 50 on to which the corresponding manifold for loading/
unloading tank cars can be welded.
The valves for liquid and gas phases can be operated independently of each other
with the aid of hand levers. When the valve is in the open position the hand lever is
automatically locked. Visual position indication is provided by indicators on both sides
of the tank car.
The vent valve and the bottom valve are interlinked by means of a connecting rod,
which means that the vent valve is opened when the bottom valve is being opened.
The connecting rod also prevents the vent valve from opening when the fluid is
sloshing about in the tank.
The vacuum breaker FV 10 fitted in the gas balance pipe of the tank car opens if
negative pressure builds up when the gas balance pipe is not connected to the
tank car.