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6.5.2.18 EPS / Dresser interface.
6.5.2.19 ZSR / Dunclare interface.
6.5.2.20 GIL interface.
7 STAGE II VAPOUR RECOVERY
7.1 ECVR or ASF Assisted Vapour Recovery System
As described in the certificate but having either an ECVR or ASF assisted vapour recovery
system. These systems extract 10% greater vapour by volume than fuel delivered. Independent
electronics control the rate of vapour extraction by the Burkert electronic control valve. These
electronics and valve are common to each system. A schematic of each system is shown in
Figure 40a.
Vapour recovery may be supplied for each grade of fuel. The existing hose is replaced by a co-
axial hose with the vapour line converted to small bore copper pipe at the connection to fixed
pipe. The nozzle is replaced by a vapour recovery nozzle which incorporates a vapour annulus.
Recovered vapour is returned to the supply tank independent of the dispenser hydraulics.
The CoCa electronics may be fitted with LCD displays. This system may also be fitted to
WWC and WWC-T1 Calculator Heads.
The electronic control valve described in the first paragraph may be any suitable alternative, an
alternative layout using a Durr vacuum pump is shown in figure 40b.
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