What is the adjustment direction of the LNG vehicle pressure boosting valve?
2 Answers
LNG vehicle pressure boosting valve adjustment direction is clockwise to open and counterclockwise to close. The differences between CNG and LNG are as follows: Different storage methods: CNG is compressed natural gas, LNG is liquefied natural gas. Different vehicle types: CNG is generally used for household vehicles, LNG is used for long-distance trucks. Different vehicle range capabilities: CNG vehicles cannot travel too far due to pressure limitations and cannot store too much natural gas, while LNG vehicles have a stronger range capability. Different methods of storing natural gas fuel: CNG is stored under high pressure, stored in high-pressure steel cylinders or steel-lined hoop-wound cylinders with a working pressure of 20MPa, while LNG is stored at low temperatures, kept in vacuum-insulated low-temperature containers at -16 degrees Celsius.
When it comes to adjusting the pressure relief valve of LNG vehicles, it's actually quite common. Based on my 10 years of experience driving LNG trucks, the pressure relief valve is usually adjusted by rotation. Turning it clockwise generally increases the pressure, while turning it counterclockwise reduces it. Why adjust it? During long-distance transportation, unstable tank pressure can affect the engine's power and even cause it to stall. I once encountered insufficient pressure while climbing a mountain slope, which made the truck shake violently. I had to quickly turn it clockwise half a turn to stabilize it. Before making adjustments, make sure the valve is clean to avoid dirt affecting accuracy. Also, safety first—when handling the valve, it's best to turn off the engine or keep it idling, and wear gloves to prevent risks from gas leaks. If you're unsure, I recommend checking the vehicle manual in advance or consulting a professional—never tamper with it blindly. Checking it before each maintenance can prevent a lot of trouble.
