The role of small fuel dispenser spill

For the analysis of the various parts of the small tanker, thereby enhancing the understanding of the small tanker. Introduced the case of a small tanker vane pumps and oil pumps, etc. It should be noted in a previous article. Works and analysis of fault diagnosis and now we look at the role of the relief valve in the pump its principal role.
Relief role is:
High pressure relief valve within the pump chamber of a door leading to the low pressure chamber, which is mainly from limiting the maximum pressure and protect the hydraulic system of the hydraulic system, and can regulate output retail fuel dispensers traffic.
Relief works:
When the motor is started, the oil pump, pressure oil flows from the pump pressurized area of ​​oil and gas separator and P relief valve opening time if open oil gun, pressure oil flows to oil separator, pressure relief valve is turned off, the pump The positive pressure and negative pressure zone area pass each other; when the oil gun is closed, the pressure in the hydraulic system of the rapid increase in oil pressure relief valve spring will overcome, the spool to the right, high-pressure oil through the relief valve P O ports and port flows to the pump suction area to achieve a circulating oil pump.
Increase the spring force can be increased up pressure in the hydraulic system. Without relief, when the hydraulic system pressure is higher than a certain value. System weak link in most book will be destroyed.
When the pressure relief valve adjustment screw clockwise twist, the pressure required to open the relief valve increases, most or all of the flow of oil and gas separator. The output portable fuel transfer pump traffic increases; when the adjusting screw counter-clockwise, the pressure required to open the relief valve is reduced, some oil through the relief valve back to the pump suction area, the external output flow decreases.

Small fuel dispenser oil pump removal and reinstallation of note:

First, install the pump cover. Copper sleeve should be coated with a little grease in order to mounting oil seal and protection. When mounting the pump cover screws, should be strictly in accordance with the order of twice the diagonal tighten each screw tightening torque knob should be basically the same, so as not to pump cover and pump combination Mifengbuyan.
Next Before disassembling the pump cover shall sanding Woodruff keyway on the shaft, so as not to dismantle the pump cover scratches on Woodruff keyway burr seal, causing leakage.
Again before the pump is mounted on the pump separator pad should be carefully examined for damage, whether to put reversed. Pump installed, should ensure that the center plane of symmetry pump pulley and motor pulley central plane of symmetry in the same plane, the pulley does not allow a clear swing and axial runout phenomenon.
At the same time the rotor assembly into the pump chamber, the application of hand (or stuck with a rigid shaft keyway hand) rotating rotor blades look carefully at whether the retractable blade slots, while viewing the rotor blade is higher. If higher rotor blades, the blades shall be polished. So that the rotor contour or slightly below the rotor.
And before servicing must be reliably cut off the power. Remove the belt from the pulley, so as to avoid accidental injury. Ready tipping the oil container to avoid oil pump and oil separator drain spilled everywhere. Finally, before you re-install the pump, use kerosene to clean all parts, do not allow any sticky dirt to avoid scratching the pump, resulting in a new fault.
Caution Disassembly and reassembly of the small auto fuel dispenser oil pump requires very close attention. The requirements of the pump seal, no leakage, the moving parts can move flexibly cable wiring, noise and vibration at work. So the various demands of the tanker is also very strict. For these considerations need more attention. After reading notes on a small heavy duty fuel dispenser oil pump is also to look at some of the latest developments on the submersible pump.

Does anyone know fuel dispenser works

Now tank automation system market is divided into electronic and mechanical tanker tanker two products. It is the most commonly used electronic tankers, is the computer type tanker, into the pump, oil and gas separation, metering, counters, motor and refueling guns. Tanker metering accuracy ± 3 ‰, usually every six months by the local metrology calibration checks,

Small fuel dispenser vane pump use and maintenance:

In a small portable fuel dispenser use, it requires frequent inspection and maintenance vane pump.
First test machine and cleaning the auto fuel dispenser, can not use water or an aqueous oil tankers, in order to avoid the cracking damage pumps and other components of internal corrosion and low temperatures.
Secondly, you should regularly clean the filter, especially a newly installed machine and piping and even more so. With the increasing use of time, dirt tank and the pipeline will be reduced, the filter cleaning cycle can be extended, but generally should not exceed one month.
Again always check whether a flexible vane pump is running even with or without abnormal noise, shaft and pump cover at the leaks, pulleys for excessive runout and wobble like.
At the same time the relief valve spring can not be adjusted too tight, or make the system pressure, noise and vibration increases and exacerbate the pump bearing wear.
Finally belt tension should be appropriate, tensioning force is too small, the belt slippery, causing supply shortage or supply, belt is also easy to wear, the tension is too large, the motor shaft and pump shaft bear additional load (axial direction of the vertical axis) increases, could easily accelerate the motor bearings, pump bearings and seals wear.

Small fuel dispenser measurement accuracy analysis:

Small retail fuel dispensers metering accuracy analysis: Small tanker meter is generally performed using a standard profile or verification, by indicating the volume of fluid metered volume indication on the counter, in the standard container is the volume of fluid injection Another volume indication appears, the difference between two values ​​is called meter absolute error of the measured volume, the relative error E its measurement accuracy is: E = (VJ-Vs) / Vs x100% wherein: VJ- metered The oil indicated value on the display panel. The actual volume measured Vs- standard containers indication. Visible small tanker still has his error exists.
From the above equation, E> 0, it means that VJ is greater than Vs, the measurement value that is greater than the standard meter display shows the value of the container, less fat oil tanker to the user. E <0, ie oil tanker multiple users, for two reasons indication error generated more complex, including the systematic errors and random errors. System errors can be compensated by appropriately adjusted. We use the adjusting mechanism adjusts the actual displacement flow meter is in compensation or correction flowmeter system error, in order to improve the accuracy of the meter. Factors affecting the measurement error problem of small tankers also have a lot of. So sometimes can not blindly suspect misconduct gas station.

fuel dispenser blade failure

Vane pump failure; if the vane pump relief valve can not be closed. Due to a foreign body (broken shrapnel, etc.) stuck in between the relief valve spool and valve seat, causing the oil inside the loop always do and can not flow in the pump, repairs should remove the valve, remove the foreign body seat; if Because the pump with the rotor blades and the shrapnel long do high-speed operation, will wear due to fatigue, fracture, leading to vent vane pump increases, even when serious loss of pumping action, the hand gasoline pump should be clear debris and repair damaged leaves, shrapnel, re-install the new replacement; and vane pump and oil separator pad bonding surface of pump breakdown or anti-loaded, can also cause the vane pump high-pressure chamber communicates with the low pressure chamber, resulting in the loss of the fuel transfer hand pump drain; if vane pump loose rotor and the rotor shaft, causing the shaft idle, this time in need of replacement repair rotor or vane pump.

Inlet valve opening pressure test rig for fuel tank

Inlet valve opening pressure test rig for fuel tank

Fuel tank pressure test, safety valve opening pressure test and fuel tank inlet valve opening pressure test rig, gas pump filters

•  compressed air source, 4.0Mpa (the equipment is taken with the use, the cost of this equipment is not included in the price of the test equipment, the price is adjusted according to the price of the same kind of product).
• the pressure rate control, 8kPa/min
• PLC control display,Monitoring gas source, 0 ~ 100kPa 2% Open the pressure control, 0 ~ 100kPa + 1% After the pressure detection, 0 ~ 60kPa + 1% Pressure rate control, 0 ~ 8kPa/min 2%
• qualified / unqualified alarm and print
• safety and explosion protection
• 53 (2) water heating cycle control system (the equipment is taken along with the use,  storage tank calibration methods ,the system charge is not included in the test cost, the price is adjusted according to the price of the same kind of product.

Fuel tank cover seal test

Fuel tank cover seal test,
(1) tank water flow control device and pumping system, full rated water + 95% (along with the check in the system,  automated fuel management system expenses are not included in
the cost of the testing equipment, fuel dispensing pump ,the price according to the market price of similar products do appropriate adjustment)
(2) the flip / reset accuracy, 3
(3) automatic weighing, 0 ~ 30g ~ 100g continuous weighing
(4) PLC control, 0 ~ 1min ~ 15s ~ 2min
(5) qualified / unqualified alarm and print.
(6) the security function of the operation platform when rotating.
(7) leakage cup electronic positioning system

Fourth test platform of oil tank monitoring system

Fourth test platform of oil tank monitoring system

Fuel tank sealing test rig, tank automation system specific technical requirements of the relevant content of the 4.5 in the 644-2000 QC/T industry standards. Test method reference 644-2000 QC/T industry standard 5.3. The whole system adopts PLC control,  vehicle identification system  water leakage box adopts high brightness lighting easy detection. The water filtration system can be selected.