Description
Stage II Vapour Recovery (VR) systems are designed to reduce hydrocarbon emissions by capturing harmful petrol vapours that would otherwise escape into the atmosphere during refuelling of motor vehicles. Stage II requires the installation of vapour recovery systems to petrol station pumps.
The picture shows the typical systems used to control the vapour return ratio. When petrol enters the vehicle tank, the corresponding amount of vapour is sucked back into the storage tank via the vapour spout of nozzle, COAX hose, COAX adaptor (splitter valve) and a vacuum pump.
We manufacture the vapour recovery nozzles, vapour control valves, COAX hose assemblies, Safety Breaks and other accessories for Stage II vapour recovery.
There are three systems to control the vapour volume. Type 1 Mechanical vapor recovery system: Adjust the A/L ratio by the mechanical A/L adjust valve which connect with the nozzle. The A/L ratio is1:1 to 1.2:1. Type 2 Electronic vapor recovery system: Adjust the A/L ratio by the electronic, the proportional valve gets dispenser pulse to adapt the A/L ratio. Type 3 Electronic vapor recovery pump with frequency conversion function is optional.
Important – for retrofitting of most existing dispensers this type is the easiest and most cost-effective solution. Only the nozzle, a COAX hose, breakaway and a suitable vacuum pump is necessary.
Type 1: The proportional valve GRVP controls the vapour volume flow by a magnet valve which is opened and closed according to the petrol flow. The GRVP functions hydraulically and is part of the nozzle.
Type 2 and 3: The electronics of the dispenser have to be connected to the electrical proportional valve or the vacuum pump. The vapour volume flow is determined by the pulses of the meter.
Type 2: A proportional valve opens and closes according to the pulses.
Type 3: The speed of the vacuum pump is determined by the pulses.
