Fluent material handling – with receiver or receiver coacting mea – Diverse fluid containing pressure filling systems involving... – Filling with exhausting the receiver
Reexamination Certificate
2003-08-04
2004-08-03
Douglas, Steven O. (Department: 3751)
Fluent material handling, with receiver or receiver coacting mea
Diverse fluid containing pressure filling systems involving...
Filling with exhausting the receiver
C141S301000, C141S392000, C137S536000
Reexamination Certificate
active
06769460
ABSTRACT:
The present invention relates to a device for controlling the recovery of vapour at stations for the dispensing of liquid fuels, e.g. petrol of various grades, from a first tank or container to a second tank or container by the intermediary of a pump and a line and/or hose with a nozzle, e.g. a pistol valve, and with a channel and/or hose for the recovery and recycling of vapour from the second tank or container to the first tank or container, or some other auxiliary aid for managing the vapour.
Prior art devices for the control of vapour recovery and recycling at tank stations include both mechanical valves and complex electronics for controlling the valves. These prior art devices entail high costs and constitute a troublesome source of problems and unreliability. The growingly encompassing environmental demands place increasingly higher standards on correct vapour recovery. Present requirements of a recovery rate of at least 95% can be met using prior art devices. However, more stringent requirements may entail a considerably higher level of complexity in the prior art devices. This will entail considerably higher costs which greatly counteract a willingness to comply.
The task forming the basis of the present invention is to realise an improved and simplified device for controlling vapour recovery.
This task is solved according to the present invention in that the device intimated by way of introduction is characterised in that a valve is disposed in the line or hose between the pump and the nozzle and includes at least one through flow channel for the fuel and at least one through flow channel for the vapour which is to be recovered, that the valve has a valve cone and a valve seat, and that the valve cone is switchable against the action of a spring from closure abutment against the valve seat corresponding to the fuel flow occurring in the through flow channel, so that vapour is recovered and recycled via the valve seat in proportion to the fuel flow. The valve cone is disposed on the end of a piston rod whose opposite end extends through a cylinder cavity and out through a cylinder top, and has a plate for movement in the cylinder cavity and co-operation with the cylinder wall. Said opposite piston end has a channel which is open in the piston end and discharges on the opposing side of the plate in the part of the cylinder cavity located on this side of the plate. The cylinder cavity between the plate and the cylinder top is, via a number of apertures, in communication with the surrounding through flow channel for the fuel. Said opposing piston end carries a compression spring for abutment against the plate and the cylinder top for urging the piston in a direction away from the cylinder top and the valve cone in a direction towards the valve seat. The valve seat discharges in a space for leading off vapour to the first tank or an auxiliary aid for management of the vapour. An outlet from the space is provided with an adjustment screw for basic adjustment of the gas recovery and recycling by means of the valve.
The present invention realises an extremely efficient control valve which makes for the elimination of all electronics called for in prior art valve arrangements. The control valve in the present invention is moreover extremely simple and reliable. The valve according to the present invention is mounted quite simply between the fuelling hose and the outlet from the pump. This implies an extremely simple and reliable arrangement, since the valve according to the present invention is mounted in a protected and safe place. The entirely mechanical construction and simple adjustment possibilities moreover make it possible to apply the valve to new stations and retrofit the valve to old stations, since it is simple to adjust the valve according to the present invention in response to the conditions prevailing at the station in question.
REFERENCES:
patent: 4440189 (1984-04-01), Graham
patent: 5720325 (1998-02-01), Grantham
patent: 5782259 (1998-07-01), Ledbetter et al.
Dinsmore & Shohl LLP
Douglas Steven O.
OPW Fueling Components
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