How to check the fuel dispenser hose and disconnect valve? Key inspection points for appearance, rewinding, and joint firmness
Release time: October 29, 2026
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The one or two meter rubber hose between the refueling gun and the refueling machine is the component in the oil and gas recovery system that is repeatedly pulled and bent the most. Poor condition of the hose can affect the smoothness of refueling and the gas-liquid ratio; The failure of the shut-off valve and the dragging of the fuel gun by the vehicle is a real accident. Checking these two items thoroughly during daily inspections is a matter of taking a few minutes to prevent major incidents.
What is the appearance inspection of the rubber hose for
Rub around the rubber hose from beginning to end to see if there are cracks, bulges, or damaged exposed lines on the outer skin, and if there are any signs of oil leakage at the base of the joint. Rubber hoses with cracks so deep that the reinforcement layer can be seen should be included in the replacement plan; The bulging indicates that the inner layer has been damaged and oil or gas has accumulated in the interlayer. We cannot wait any longer. There are oil stains on the ground of the refueling island. When checking the hose joints along the vine, most of the leaks start from the root of the joints.
The Importance of Rolling and Placing
After hanging the gun, the rubber hose should naturally roll back. Do not kill or break it, do not get crushed by the wheels, and do not expose it to long-term sunlight. The inner layer of the dead fold is repeatedly folded, which is a high incidence of early damage; The reinforced layer of the rubber hose after crushing is damaged, and its appearance may not be visible, but its pressure resistance has decreased. The position of the hose hook is reasonable, the hanging is natural, the curvature of the bend is smooth, and the service life can be much longer.
How to confirm the reliability of a pull off valve
The function of the pull off valve is to disconnect and self seal both ends when the vehicle is driven with a gun under a set tension. Confirm during inspection that there are no cracks on the appearance of the valve body, the two ends are firmly connected without looseness, and the sealing components on the fracture surface are intact. During daily inspections, gently shake the joint with your hand to determine its firmness; A station that conducts periodic tensile testing and records the testing date and results. The disconnect valve that has been pulled by the vehicle once, regardless of its appearance, should be replaced as a whole and cannot be reset before continuing to use.
Judgment of replacement timing
If any of the three signals appear, consider replacing them: bulges, exposed wires, or oil leakage at the joints on the appearance; The refueling flow rate significantly decreases or the gas-liquid ratio adjustment is ineffective; Meet the manufacturer's recommended service life. When replacing, evaluate the gun, disconnect valve, and connector together. If the rubber hose is replaced separately and an old disconnect valve is left, it is equivalent to replacing half of it. Mark and isolate the replaced old parts to avoid mixing and backflow.
| body part | Checkpoints | Disposal |
|---|---|---|
| Appearance of rubber hose | Cracks, bulges, exposed lines, oil leakage | Replace bulges/exposed wires immediately |
| Placement status | No dead breaks, no crushing, and no hanging smoothly | Correct habitual folding |
| Pull off valve | No cracks, firm connection, and intact sealing | Replace the pulled whole unit |
| service life | According to the manufacturer's recommended cycle | Expired evaluation replacement |
Frequently Asked Questions
Is there a relationship between unstable gas-liquid ratio and rubber hose?
It matters. Damage to the inner layer of the hose or leakage at the joint can damage the airtightness of the return air passage. First, check the hose and joint, and then adjust the gas-liquid ratio device in reverse order.
Is it still possible to reset the valve after pulling it?
No. The pull off valve is a disposable protective component that is replaced as a whole after one action, and the reliability of the reset component is not guaranteed.
What should be noted when replacing rubber hoses?
Select the specifications that match the model, add oil after installation to observe if there is any leakage in the joint and if the flow rate is normal. Check again on the first day of use.
What supporting services does WoHong offer?
Luoyang Wohong Petrochemical Equipment Co., Ltd. provides supporting parts such as fuel dispenser hoses and break valves, as well as inspection support for gas station equipment. Contact number: 13526990215, email: lixiang@vohon.cn .
