Tokheim TQP-HS User manual

Document Ref 942005-001
Rev - 2
11/2011
TQP-HS
Pumping Unit
Component Technical Manual
TM Patent Pending

Document Ref 942005-001 Rev 2
TQP-HS for Fuel Dispensers Component Technical Manual
Great care has been taken in the preparation of this manual however Tokheim
shall not be liable for any misunderstanding, errors and/or loss or defect
arising from the use of this manual.
Tokheim shall not be liable for damage to the product, nor for personal or
third party injury, caused by incorrect use of the product or by attempts to
maintain or to repair the product by parties other than those fully trained by
Tokheim or by its accredited third party representatives.
Pleasecontactyournearestservicedepartment,attherelevantaddressprinted
onthe back cover of this manual, should any aspectof this manual be unclear.
© Copyright by Tokheim.All intellectual rights arising from, accruing to,and
residing in this manual belong to Tokheim. No part of this document may be
reproduced in any form without the express written permission of Tokheim.
Tokheim reserves the right to apply changes to this document and the
equipment without further notice.

Document Ref 942005-001 Rev 2 1
Component Technical Manual TQP-HS for Fuel Dispensers
REVISION RECORD
Date Revision Page Reason
05/07/2007 1 All Original Issue
24/11/2011 2 All All page issue references removed
Front page New front cover
3 & 4 Main contents updated
1-1 EPZ Manual reference note added
1-4 to 1-5 New warning sign added
1-6 Machinery Directive changed to 2006/42/EC
2-1 Section 2 Contents updated
2-2 Typeplate serial no. changed
2-4 Liquid temperature changed
2-6 Above Ground Tank Application added
3-1 Section 3 Contents updated
3-2 Pressure release diagram changed
4-2 TQP-HS diagram changed
4-3 Air vent diagram changed
5-1 Section 5 contents updated
5-2 to 5-3 Front View & Parts List changed
5-4 & 5-5 Back View & Parts List changed
5-6 & 5-9 Top View & Parts List changed
5-11 Outlet Insert Repair Kit removed
5-12 Outlet Valve Repair Kit updated
5-13 Drain Screw Repair Kit removed
5-13 to 5-14 Pages removed
Back page New back cover
12/03/2012 2.1(Sect.2) 2-6 to 2-7 Section 2.6.2 Above Ground Tank updated
19/03/2012 2.2 (Sect.2) 2-3 New drawing for TQP-HS 130 L/Min
2-4 Change to the text for Hydraulic performance

2Document Ref 942005-001 Rev 2
TQP-HS for Fuel Dispensers Component Technical Manual
This page is intentionally blank

Document Ref 942005-001 Rev 2 3
Component Technical Manual TQP-HS for Fuel Dispensers
CONTENTS
1 INTRODUCTION........................................................................................................ 1-2
1.1 How to Use this Manual ......................................................................................1-2
1.2 Product Scope ......................................................................................................1-2
1.3 AuthorisedTechnicians ........................................................................................1-2
1.4 Contact Information .............................................................................................1-2
1.5 Health & Safety ...................................................................................................1-3
1.5.1 Safety Checklist...................................................................................1-3
1.5.2 Duties of the Employees......................................................................1-3
1.5.3 Hazards................................................................................................1-4
1.5.4 WarningSigns ......................................................................................1-4
1.5.5 Personal Protective Equipment (PPE) ................................................1-5
1.6 Standards & Certificates......................................................................................1-6
2 PRODUCT INFORMATION .................................................................................... 2-2
2.1 Definitions ............................................................................................................2-2
2.2 Configurations ......................................................................................................2-2
2.2.1 TQP-HS 80 l/min .................................................................................2-2
2.2.2 TQP-HS 130 l/min ...............................................................................2-3
2.3 Technical Characteristics .....................................................................................2-3
2.4 Alignment of the Pump ........................................................................................2-4
2.5 Schematic Diagram of Operating Principles ........................................................2-5
2.6 Operating Description ..........................................................................................2-6
2.6.1 Pumping, Filtration & By-Pass ............................................................2-6
2.6.2 Above GroundTankApplications ........................................................2-6
2.6.3 Air Separation......................................................................................2-6
2.6.4 Outlet Valve .........................................................................................2-7
2.6.5 Recovery Chamber..............................................................................2-7
2.6.6 Vent to Atmosphere .............................................................................2-7
2.6.7 Draining the TQP-HS..........................................................................2-8
2.6.8 V-beltTransmission .............................................................................2-8
2.6.9 Motors..................................................................................................2-8
3 FAILURE DIAGNOSIS .............................................................................................. 3-2
3.1 FailureDiagnosis ..................................................................................................3-3
3.2 Flow Charts ..........................................................................................................3-4
3.2.1 No Fuel Flow .......................................................................................3-4
3.2.2 Reduced Fuel Flow ..............................................................................3-5
3.2.3 Uneven Fuel Flow................................................................................3-6
3.2.4 Closing of the Overflow Valve ............................................................3-7
3.2.5 Excessive Noise...................................................................................3-8
4 TROUBLESHOOTING .............................................................................................. 4-2
4.1 Outlet Pressure ....................................................................................................4-2
4.2 Inlet Pressure .......................................................................................................4-3
4.3 Air Vent................................................................................................................4-3
4.4 Internal Air Entry in the Pump .............................................................................4-4
4.5 External Problems up-stream the TQP-HS .........................................................4-4
4.6 Excessive Head Loss...........................................................................................4-4
4.7 Air Entry on the pipework to the Storage Tank ...................................................4-5
4.8 Problem Report form for the TQP-HS pump ......................................................4-6

4Document Ref 942005-001 Rev 2
TQP-HS for Fuel Dispensers Component Technical Manual
5 SPARE PARTS AND MAINTENANCE TOOLS.................................................... 5-2
5.1 Exploded Views and Parts Lists ..........................................................................5-2
5.1.1 Front View ...........................................................................................5-2
5.1.2 Back View ...........................................................................................5-4
5.1.3 Top View and Filterbox........................................................................5-6
5.2 Frequently Used Spare Parts .............................................................................5-10
5.3 References to Specific Tools .............................................................................5-10
5.4 Maintenance Kits ............................................................................................... 5-11

Component Technical Manual TQP-HS for Fuel Dispensers
Document Ref 942005-001 Rev 2 Page 1-1
CONTENTS
1 INTRODUCTION........................................................................................................ 1-2
1.1 How to Use this Manual ......................................................................................1-2
1.2 Product Scope ......................................................................................................1-2
1.3 AuthorisedTechnicians ........................................................................................1-2
1.4 Contact Information .............................................................................................1-2
1.5 Health & Safety ...................................................................................................1-3
1.5.1 Safety Checklist...................................................................................1-3
1.5.2 Duties of the Employees......................................................................1-3
1.5.3 Hazards................................................................................................1-4
1.5.4 WarningSigns ......................................................................................1-4
1.5.5 Personal Protective Equipment (PPE) ................................................1-5
1.6 Standards & Certificates......................................................................................1-6
PLEASE REFER TO THE PASV3 COMPONENT TECHNICAL MANUAL 903647
REGARDING ANY TECHNICAL INFORMATION AND SPARE PARTS USED
BEFORE THE PUBLICATION DATE OF THIS MANUAL.

Page 1-2 Document Ref 942005-001 Rev 2
TQP-HS for Fuel Dispensers Component Technical Manual
1 INTRODUCTION
1.1 How to Use this Manual
It is recommended that all relevant persons familiarise themselves with the contents of this
manual prior to carrying out any operations or procedures.
This manual is divided into sections which are described as follows: -
Section 1 - Introduction
Thissectioncontainsinformation on how to use the manual, the scope ofequipmentcovered,
recommendationsonqualifiedtechniciansandcontactinformation. Italso includes relevant
health and safety information required for the safe installation of the product.
Section 2 - Product Information
This section contains the system descriptions and operating principles of Tokheim’s TQP-
HS pumping unit.
Section 3 - Failure Diagnosis
This section provides the failure diagnosis flow charts for the TQP-HS.
Section 4 - Troubleshooting
This section gives information on troubleshooting problems with the TQP-HS.
Section 5 - Spare Parts & Maintenance Tools
Section 5 lists the assembly drawings and part identification lists for the TQP-HS including
specific tools and maintenance kits.
1.2 Product Scope
Thismanual is designedtocoverthe TQP-HS pumpingunitin Quantium 10seriesdispensers.
1.3 Authorised Technicians
Only qualified technicians familiar with the contents of this manual should carry out the
procedures contained herein.
WARNING : ANY ATTEMPTS TO CARRY OUT THE PROCEDURES OF THIS
MANUAL, BY UNQUALIFIED OR UNAUTHORISED PERSONS, MAY
RESULT IN SERIOUS INJURY OR LOSS OF LIFE.
NOTE : THIS MANUAL IS NOT INTENDED TO REPLACE THE SERVICES
OF A FULLY QUALIFIED TECHNICIAN.
1.4 Contact Information
For information relating to the contents of this manual please contact: -
TechnicalAuthor
Tokheim UK Ltd.
Dundee, Scotland
For technical assistance please contact the appropriate service division listed on the back
cover of this manual.

Component Technical Manual TQP-HS for Fuel Dispensers
Document Ref 942005-001 Rev 2 Page 1-3
1.5 Health & Safety
1.5.1 SAFETY CHECKLIST
•It is obligatory that this checklist be fully complied with during all work at the
petrol station, particularly construction or repair work.
•It is the duty of the contractor to ensure that all workers employed by him obey
each and all of the relevant laws, directives and other regulations.
Areas where special caution is required
•Theinsides of tanks, tubes, dome shafts, filling shafts, change over shafts, vessels
and dispensers.
•All areas in which fuel vapour that is heavier than air can accumulate, e.g. fuel
separator, draining shafts, low located rooms, cellars, excavations, pipe trenches
etc.
•Theareas around the outlets of tank ventilation pipes, especially during the filling
phase.
•All areas near dispensers, tanker lorries and other vehicles while they are being
tanked up, and particularly when there is a lack of wind.
•A radius of 1.0 metres around petrol carrying pipes, as well as pipes that are not
vapour free.
•Silt traps.
1.5.2 DUTIES OF THE EMPLOYEES
•To ensure optimal accident prevention in our company, in addition to general
rules applying to worker’s protection, it is necessary to take into account all the
national protection of workers legislation and to actively support all measures
which enhance safety standards.
•Itisanemployee’s duty to follow all company directives regarding the prevention
of accidents, unless such directives can be proved to be unfounded.
•Employees should not follow any instructions that go against safety standards.
•Employees are only permitted to use equipment for its original purpose, and this
is defined by the company alone.
•If an employee detects equipment that is deficient in terms of safety, he shall
eliminate this deficiency immediately. If such safety rectification is not part of
his defined area of activities, or if his knowledge is insufficient to carry out such
work he must immediately inform his superior about the detected safety
deficiency.
This equally applies to:
1) Work Materials which have not been correctly packed or correctly marked in
order to meet safety requirements.
2) Work Methods or work processes which have not been correctly coordinated
or controlled in order to meet safety requirements.
3) Where dangerous activities are carried out by several persons, the need
for a permanent faultless communication between them in order to avoid
dangerous events shall require the appointing of one person in order to carry out
overallsupervision.

Page 1-4 Document Ref 942005-001 Rev 2
TQP-HS for Fuel Dispensers Component Technical Manual
1.5.3 HAZARDS
Prior to starting work, the dispenser must be isolated (i.e. entirely disconnected
from the mains supply) and the mains supply switch locked in the OFF position.
The submerged pump (if applicable) and control signals from the dispenser must
also be isolated. This is done to provide safety for the technician. As a further
precaution, switch off the mains supply in the service station shop and place a
clear notice on the switch to avoid it being turned on again inadvertently.
WARNING : THE CONNECTION AND DISCONNECTION OF
ELECTRICAL CONNECTIONS MAY ONLY BE CARRIED OUT BY
QUALIFIED PE ONNEL AUTHORISED FOR SUCH ACTIVITIES.
WORK IN DANGEROUS AREAS MUST BE MADE SAFE BY
OBSERVING ALL THE NATIONAL SAFETY REQUIREMENTS IN
FORCE.
It is not permitted to put a fuel dispenser into operation before an authorised
officialhasinspectedit and released it. This depends upon the national regulations
in force.
Dismantled packaging and cladding must be stored in such a way as to avoid
damage to components or injuries to persons. Covers that can be opened, such
as the calculator housing, should be handled with care. Ensure that the retaining
catch is placed in the correct position to prevent the cover falling onto the head
of the service engineer or other persons in the area.
At unattended service stations, every end-user should be able to read the User
Instructions. They should be visible on a notice board or integrated into the DIT
and should be sufficiently well lit so that they can be read at night.
At unattended service stations break away couplings must always be used to
reduce the danger caused by a motorist driving off with the nozzle still in the
tank.
1.5.4 WARNINGSIGNS
The following warning signs are fitted as standard, on the dispenser, however
they may vary according to individual country requirements or customer
specifications.
Do not use mobile
phones
SIGN
Visible from both
sides of dispenser
Visible from both
sides of dispenser
MEANING POSITION
No naked flames

Component Technical Manual TQP-HS for Fuel Dispensers
Document Ref 942005-001 Rev 2 Page 1-5
1.5.5 PERSONAL PROTECTIVE EQUIPMENT (PPE)
PROTECTIVE CLOTHING
The following clothing should be worn at all times during installation and
maintenance procedures:-
•Protective helmet.
•Protective shoes (conductive).
•Protective gloves and/or protective hand cream.
•Anti static clothing.
•Eye protection.
Do not spill fuel on the
ground
Stop vehicle engine At Diesel high speed
dispensers near the
nozzleboots
Visible from both
sides of dispenser
Visible from both
sides of dispenser
Trucks only
Do not drive away with
nozzle in tank
Next to User
Instructions near the
nozzleboot
Visible from both
sides of dispenser
Visible from both
sides of dispenser
Smokingforbidden

Page 1-6 Document Ref 942005-001 Rev 2
TQP-HS for Fuel Dispensers Component Technical Manual
SAFETY EQUIPMENT FOR WORKING IN HAZARDOUS AREAS
The following safety equipment is required for working in hazardous areas:-
•Only spark free tools are permitted for work on dispensers.
•Work on bearings is only permitted using the standard workshop tools authorised
for this kind of work.
•The use of all electrical tools is strictly prohibited.
•Only the use of explosion protected work lights is permitted.
•Theuse of telecommunications equipmentinhazardous areas is strictlyprohibited.
SAFETY INSTRUCTIONS
The following safety instructions must be adhered to during installation and
maintenance procedures:-
•Inhalation of petrol vapour must be avoided. Suitable precautions must be taken
and where necessary respirators used.
•Avoid direct contact of fuel with the skin.
•Use suitable protective clothing, protective gloves and/or protective hand cream.
•Avoid fuel spills.
•No smoking, no naked flames are permitted.
•Long hair and ties can get caught in moving parts. Hair must be suitably covered.
1.6 Standards & Certificates
Tokheim TQP-HS pumping units are constructed in conformity with the requirements of
all the applicable European Directives (Machinery 2006/42/EC; EMC 89/336/EEC;ATEX
94/9/EC).
The TQP-HS, MID cert TC7186 fulfills the requirements as mentioned in Annex 1 and
Annex MI-005 of the Directive 2004/22/EC.
TQP-HS pumping units are incorporated into Tokheim fuel dispensers which conform to
the essential requirements of the Machinery Directive 2006/42/EC.
The components used within the TQP-HS are selected in accordance with the European
Standard EN BS 60079-0 (Electrical Apparatus for explosive gas atmospheres) and the
supplementary Standards listed therein.
The production and end test is controlled through the Quality Assurance systems within
the Tokheim Manufacturing Centres, and has received Quality Assurance Notification
from a Notified Body.
No modification to the component may be performed without express permission from
Tokheim and must always use original components or Tokheim retrofit kits. Failure to
comply with the above will invalidate product conformance with the relevant European
Directives and Tokheim will no longer accept product liability.

Document Ref 942005-001 Rev 2.2 Page 2-1
Component Technical Manual TQP-HS for Fuel Dispensers
CONTENTS
2 PRODUCTINFORMATION .........................................................................................2-2
2.1 Definitions ............................................................................................................2-2
2.2 Configurations .......................................................................................................2-2
2.2.1 TQP-HS 80 l/min ................................................................................. 2-2
2.2.2 TQP-HS 130 l/min ............................................................................... 2-3
2.3 Technical Characteristics ......................................................................................2-4
2.4 Alignment of the Pump .........................................................................................2-5
2.5 Schematic Diagram of Operating Principles ..........................................................2-6
2.6 Operating Description ...........................................................................................2-7
2.6.1 Pumping, Filtration & By-Pass.............................................................2-7
2.6.2 Above Ground Tank Applications ........................................................2-7
2.6.3 Air Separation ......................................................................................2-7
2.6.4 Outlet Valve .......................................................................................... 2-8
2.6.5 Recovery Chamber ..............................................................................2-8
2.6.6 Vent to Atmosphere .............................................................................. 2-8
2.6.7 Draining the TQP-HS ..........................................................................2-9
2.6.8 V-belt Transmission ..............................................................................2-9
2.6.9 Motors ..................................................................................................2-9

Page 2-2 Document Ref 942005-001 Rev 2.2
TQP-HS for Fuel Dispensers Component Technical Manual
2 PRODUCT INFORMATION
2.1 Definitions
TQP-HS: Commercial name of the TQP-HS
There is one hydraulic block for both 80l/min and 130l/min flow
TQP-HS 80: Name used when the delivery is 80 l/min (4.8 m3/h)
The TQP-HS 80 is equipped with a 1kW 1400 rpm motor
TQP-HS 130: Name used when the delivery is 130 l/min (7.8 m3/h)
The TQP-HS 130 is equipped with a 1.5kW 2800 rpm motor
Type plate:
IMPORTANT NOTE
When reporting a case of anomaly or malfunction, the name TQP-HS must be
reported together with the serial number indicated on the type plate near the pump
pulley (see above diagram). Please complete the problem report form in section
4.8 before contacting Tokheim.
2.2 Configurations
2.2.1 TQP-HS 80 L/MIN
TQP-HS
80
2.4 m³/h
40 l/min
TQP-HS
80
2.4 m³/h
40 l/min 4.8 m³
80 l/min
TQP-HS
80
2.4 or 4.8 m³/h
40 or 80 l/min
TQP-HS
80 TQP-HS 80
9.6 m³/h
160 l/min
Gas Separator
for liquid fuel.
Dundee, Scotland
Temp Range: -10°C to +55°C
File Reference: TR801
Qmax 130 l/min
Qmax 80 l/min Diesel
Gasoline/Diesel Pmax 3.5 bar
Pmax 3.5 bar Pmin 2.3 bar Pmin 1.7 bar
PAS V3/TQP-HS:
I I 2 G EEx c T3
MMQ: 2 l Environment Class: C
Year/Serial No: 2007G0#1
W&M Cert: TC7186

Document Ref 942005-001 Rev 2.2 Page 2-3
Component Technical Manual TQP-HS for Fuel Dispensers
2.2.2 TQP-HS 130 L/MIN
TQP-HS
130
2.4 or 4.8 m³/h
40 or 80 l/min 2.4 or 4.8 m³/h 40 or 80 l/min
IMPORTANTNOTE
Do not install TQP-HS pumps, 80 or 130 lpm, in series on the same suction line.
Separate suction lines are required as shown above.
TQP-HS TQP-HS
130 130
7.8 m 7.8 m³³/h /h
130 l/min 130 l/min

Page 2-4 Document Ref 942005-001 Rev 2.2
TQP-HS for Fuel Dispensers Component Technical Manual
Suction capacity: vacuum pressure dry pump is 350 mbar
vacuum pressure wet pump (with oil) is 700 mbar
Pump intake depth 1.5 to 4 meters depending on installation conditions
Air separator fulfils the EEC regularisation for systems without sight glass
Filters 12 or 25 μm paper mesh and 90 μm plastic mesh (can be cleaned
and re-used). The filter can easily be replaced without spillage,
and without losing the priming on the suction line due to the foot
valve in the bottom of the filter box.
Liquids fuels with a viscosity lower than 10-4 m2/s
Minimum inlet vacuum 300mB @ 80 l/min
for correct operation 300mB @ 130 l/min
2.3 Technical Characteristics
DIMENSIONS
Width x height x length 225 x 450 x 490 mm including motor, filter and mounting
bracket
Weight 37 kg
Suction pipe Ø 1.5 or 2 inches (40 l/min)
Ø2 inch (80 and 130 l/min)
Inlet of the filter housing DN Ø 40/49 mm (1.5”)
TQP-HS Type Motor power Ø of motor pulley Ø of pump pulley
TQP-HS 80 1 kW / 1400rpm 95 mm 150 mm
TQP-HS 130 1.5 kW / 2800rpm 71 mm 150 mm
HYDRAULICPERFORMANCES
The hydraulic performance indicators listed below are for a standard installation (i.e. one
pumping unit on the pipeline to the storage tank). The pump has a static lift of 4m, pipe
diameter of 2 inches and pipe length of 40m with a fuel temperature of 20°C.
Flow rate: 40 and 80 l/min (motor of 1 kW) or
130 l/min (motor of 1.5 kW)
Pressure: 1.7 ≤P ≤3.5 bar for TQP-HS 80 l/min
2.3 ≤P ≤3.5 bar for TQP-HS 130 l/min

Document Ref 942005-001 Rev 2.2 Page 2-5
Component Technical Manual TQP-HS for Fuel Dispensers
ENVIRONMENTALCONDITIONS
Climate Marine, tropical, industrial and polar
Ambient temperature range -40°C to +55°C
Temperature of liquid -40°C to +55°C
Relative humidity 5% to 95% non condensing
Altitude Sea level up to 2000 m
2.4 Alignment of the Pump
When installing the TQP-HS the following measures have to be taken into consideration
regarding the V-belt.
Adjust the pulleys of the motor and pump in such a way that they are positioned in one
plane. A flat plate can be used to position the pulleys correctly. In this case, the plate must
touch the pulleys at four points (refer to diagram below):-

Page 2-6 Document Ref 942005-001 Rev 2.2
TQP-HS for Fuel Dispensers Component Technical Manual
2.5 Schematic Diagram of Operating Principles
SCHEMATIC DIAGRAM REFERENCES
1) Inlet pipe
2) Foot valve
3) Filter
4) Gear pump
5) Drain
6) Float system
7) Vent float (non overflow device)
8) Vent
9) Top vent plug
10) Recovery chamber
11) Permanent air separation leak
12) Vortex regulating valve
13) Low pressure air separation leak
14) Low pressure vortex valve
15) Outlet valve reference to atmosphere
16) By-pass
17) Vortex centrifugal inlet
18) Air separation channel
19) High-pressure chamber
20) Drain and pressure plug
21) Outlet valve seat
22) Outlet valve
23) Outlet valve spring
24) Aeration valve

Document Ref 942005-001 Rev 2.2 Page 2-7
Component Technical Manual TQP-HS for Fuel Dispensers
2.6 Operating Description
2.6.1 PUMPING,FILTRATION & BY-PASS
The fuel held in the storage tank underground is raised by the gear pump [4] and
passes through the filter [3] and the foot valve [2].
The gear pump forces the product through the vortex system [17] into the high-
pressure chamber [19].
When the flow pressure exceeds the reference pressure, adjusted by the by-pass
screw, the by-pass valve [16] opens and the excess fuel in the high-pressure
chamber [19] is channelled back to the intake. Thus, the outlet pressure is kept
constant regardless of the flow drawn off by the fuel distribution hose(s).
2.6.2 ABOVEGROUNDTANKAPPLICATIONS
The Tokheim suction pumps have been specifically designed to work in conjunction
with underground tanks where the fuel level inside varies between 0.5 and 4
meters below the pump shaft.On suction pumps, minimal vacuum held on the
suction line must be greater than 80mB to allow normal operation of pump and
air elimination device.
Should dispensers be connected to ‘above ground tanks’ (partial or total), special
care must be taken to avoid siphoning storage tanks via air vents or in case of
leak/accident on connecting pipes, by using properly installed anti-siphon valves.
Please refer to state of the art equipment currently available and compliant with
local/national rules/requirements. Eg: OPW anti-siphon valves.
Recommendation is to install this device at its highest point of piping, to allow for
maximum protection.
Note : Tokheim cannot be held responsible for any equipment failure,
accident or injury should these instructions not be followed.
2.6.3 AIRSEPARATION
The flow is channelled tangentially into the vortex where the shape of the inlet
[17] imparts a helical movement to the flow producing a centrifugal effect.
Due to the strong centrifugal effect, air/vapour is extracted from the flow with
the heavier liquid product molecules in the flow forced by the centrifugal pressure
towards the outside walls of the vortex channel and then directed away to the
high-pressure chamber. The lighter air/vapour molecules remain trapped in the
centre of the vortex channel and are then directed away through the vortex tube
and vortex valves into the recovery chamber.
The purpose of the vortex valves is to regulate the flow at different pressures.
The pressure depends on the amount of air in the flow. After the vortex valves,
the particles move into the recovery chamber [10].
Important!

Page 2-8 Document Ref 942005-001 Rev 2.2
TQP-HS for Fuel Dispensers Component Technical Manual
The vortex body exists of two valves in parallel:-
•The vortex regulating valve [12]
A piston spring loaded valve which gives a constant headloss between the air
separation channel and the recovery chamber. This valve stays open to keep
the air separation system working at any pressure or flow.
•Low-pressurevortex valve [14]
A piston spring loaded valve which opens when the pressure is less than 1 bar.
2.6.4 OUTLETVALVE
Once the liquid has had the air/vapour extracted, it enters the high-pressure
chamber located on the down-stream circuit after the vortex. In this chamber, a
spring loaded non-return outlet valve [22] performs the dual function of:-
•An authorisation valve (opening when the pressure is sufficient) and
•A non-return valve which will keep pressure on the measuring system. This is
necessary to avoid start up errors at the next pumping cycle. Within the valve,
a pressure overload vent limits this pressure.
An aeration valve is placed on the other side of the outlet channel. This valve
performs air separation in two stages:-
•at high level presence of air, the aeration valve opens to keep the pump at low
pressure (up to 0.7 bar) and the outlet valve is closed. The air is then removed
from the pump via the vent [8].
•as the air proportion reduces, the pressure in the pump increases and the aeration
valve closes. Fuel and air pass through the vortex separation system and the
pump is then ready to distribute fuel when the nozzle is opened.
2.6.5 RECOVERYCHAMBER
In the recovery chamber [10] the following flows are collected back:-
•The vapour/liquid flow from the central canal of the vortex [18]
•The flow through the aeration valve in the outlet channel [24] (only when the
pressure is < 0.7 bar)
These flows are necessary for the functioning of the system and together they
amount to approximately 8 l/min. These flows are brought back to the pump
inlet by the recovery float valve [6].The specially designed recovery float valve
maintains the liquid at a constant level.
2.6.6 VENTTOATMOSPHERE
A vent [8], located at the highest point on the cover, maintains the recovery
chamber at atmospheric pressure.
The gas that is extracted from the central channel of the vortex is released into
the atmosphere by this vent. According to certain local regulations, a pipe or
hose must be connected to this vent.A non-overflow device [7], made by a float
operated valve, is put in the vent channel.