What is diesel and gasoline dry valve loading arm?
The diesel and gasoline dry valve loading arm, a bottom-sealed loading device specifically designed for flammable and explosive liquids such as gasoline and diesel, integrates the dual requirements of safety protection and operational efficiency into its design concept. It plays an irreplaceable role in the loading process of petrochemical products for road and railway transportation.
From the perspective of structural design, the core of this hose arm lies in the collaborative work of the dry valve assembly and the sealed connection system. The dry valve adopts a special sealing structure, which can achieve complete shut-off in the non-operating state to avoid liquid dripping and leaking. The quick connector connected to the tank truck uses standardized dimensions, which are compatible with the mainstream bottom interfaces of tank trucks on the market. It not only can complete the docking quickly but also forms a sealed space at the moment of connection, eliminating direct contact between the liquid and the air. The vertical pipe, as the channel for liquid transportation, has an adjustable length according to the height of the tank truck. The end is usually equipped with an anti-vortex device to reduce static electricity generated by the violent agitation of the liquid during the loading process.
In terms of the operation process, the whole process emphasizes both convenience and standardization. Operators need to first check the cleanliness and tightness of the bottom interface of the tank truck. After confirmation, they hold the quick connector of the transfer arm to align with the interface for insertion. A "click" sound indicates that the connection is in place. Then, slowly open the dry valve, adjust the loading speed through the flow control valve on the transfer arm, and the liquid flows into the tank truck smoothly through the vertical pipe under pressure. When the preset loading amount is reached, first close the dry valve, wait for the residual liquid in the pipeline to flow back completely, and then unlock the quick connector to complete the entire loading process. The whole operation only requires 2-3 operators to cooperate, and the loading time for a single tank truck is more than 30% shorter than that of the traditional top loading method.
Analyzed from the perspective of safety and environmental protection, the advantages of this equipment are particularly prominent. Due to the adoption of bottom-sealed loading, gasoline and diesel will not volatilize into the air during the loading process, which not only avoids the risk of explosion caused by volatile gases encountering fire sources but also reduces the emission of VOCs (Volatile Organic Compounds), complying with the requirements of national environmental protection standards on the emission limits of air pollutants. At the same time, the entire equipment is made of conductive materials, and static electricity is conducted out through the grounding device, effectively preventing static electricity accumulation from generating sparks. In addition, the loading arm is also equipped with an emergency shut-off device, which can automatically or manually cut off the liquid transportation in case of abnormal situations such as leakage and overpressure, minimizing accident losses.
This type of hose arm is widely used in scenarios such as the loading of tank trucks for gas station distribution, the outward transportation of finished oil depots in refineries, and the transfer of finished oil in logistics parks. Especially in areas with strict safety and environmental protection requirements, such as oil depots around urban areas and coastal chemical industrial parks, its sealed loading feature has become a key equipment to meet regulatory requirements. With the development of new energy vehicles, although the growth rate of demand for finished oil has slowed down, in fields such as diesel-powered heavy trucks and engineering machinery, this kind of transfer arm remains an important equipment to ensure efficient and safe transportation of fuel.
