What is the function of the valve in the power steering high-pressure oil pipe?
2 Answers
Hydraulic power steering systems utilize a pressure stabilizing valve block to maintain consistent pressure, ensuring better control of the steering mechanism and protecting it from damage due to excessive pressure. Below is relevant information: 1. High-pressure oil pipe: Professionally termed as the inlet pipe, oil leakage can cause pressure loss, leading to insufficient oil pressure which results in heavier steering and loss of power assistance during driving. If the vehicle continues to operate after the oil has completely leaked, the steering gear and power steering pump will experience accelerated wear due to the lack of lubrication and cooling from the power steering fluid, significantly reducing their service life. 2. Hydraulic machine: A hydraulic machine uses liquid as the working medium, operating on Pascal's principle to transmit energy for various processes. It typically consists of three parts: the machine body (main unit), the power system, and the hydraulic control system. Hydraulic machines are categorized into valve hydraulic machines, liquid hydraulic machines, and engineering hydraulic machines.
That valve inside the power steering high-pressure hose primarily functions to prevent excessive hydraulic pressure. As a technician with extensive experience in steering systems, I can confirm this valve acts as a safety relief valve—it automatically releases oil to reduce pressure when it's too high, protecting the steering pump and gearbox from damage. If the valve gets stuck or develops an oil leak, the system pressure becomes unbalanced, resulting in heavy or inconsistent steering effort, often accompanied by unusual noises, severely compromising driving experience. In daily repairs, I frequently encounter failures caused by contaminated or aged fluid. After diagnosis with pressure testing tools, replacement is straightforward and inexpensive, but delaying repairs can jeopardize the entire steering unit. While modern steering systems are shifting toward electric power assistance to reduce hydraulic components, many older hydraulic vehicles remain in service. I always remind car owners to regularly replace steering fluid and inspect high-pressure hose conditions to prevent this small valve from causing major issues. Maintaining hydraulic balance ensures smooth and safe steering operation.
