Natural gas valve oil seal for heavy duty truck

The invention provides a natural gas valve oil seal for a heavy duty truck. The natural gas valve oil seal for the heavy duty truck comprises a metal framework and a spring which provides lasting radial force for tightened twining, wherein the exterior of the metal framework plays a part in supporting, the interior of the metal framework is provided with a rubber body used to guarantee seal performance, a main lip is arranged in the inner diameter direction of the rubber body, an oil level corner which faces outwards is arranged on the main lip, an intersection angle of 38-54 degrees is formed between the oil level corner and the axial direction of the main lip, a gas level corner which faces the direction of a combustor is arranged on the main lip, an intersection angle of 13-25 degrees is formed between the gas level corner and the axial direction of the main lip, the center of a spring groove is arranged on one side of the gas level corner, and the distance between the center of the spring groove and the center line of the main lip is 0.15-0.5mm. According to the natural gas valve oil seal for the heavy duty truck, the main lip not only guarantees that a small amount of engine oil enters the main lip of the natural gas valve oil seal for the heavy duty truck and then plays a part in lubrication, but also prevents a large amount of the engine oil from entering an air cylinder, and then prevents the engine oil from participating in burning, and thereby prevents carbon deposition on an air valve. Accordingly, interference magnitude of 1.1-1.4mm is designed, and the natural gas valve oil seal for the heavy duty truck is suitable for the heavy duty truck.