Generally it would be cheaper to replace the unit with a used one from a salvage yard. If the power steering fluid has metal particles in it the pump has failed. At this point the entire system including pump, hoses and rack should be swapped out. The reason is that you can NEVER get all the abrasives out of the plumbing and if you replace just the spool valve contamination in the fluid will quickly destroy your repair work.
A common reason for this to happen with front wheel drive vehicles, is the steering rack is going bad. Cold weather will aggravate it even more.This is more of an annoyance than a safety issue. Mark This is most likely caused due to a problem in your spool valve on the steering rack. It can be repaired but I'm not sure if it's legal to do so in your country - you'll probably have to replace the rack. Plain and simple ---the valve body of the steering gear is shot replace the steering box or rack as the case may be www.powerbrakeandsteering.co.za
spool valveA spool valve is a multidirectional hydraulic or pneumatic valve usually operated by a joystick. It has several hoses attached to it leading to different pneumatic rams. When the joystick is pushed in one direction, it causes the valve to shut off one of the pneumatic hoses leading to the ram and open the other. Which way the joystick is pushed moves the piston in the ram in or out. Since you specified a solenoid operated valve it is operated not by a joystick that is directly connected to the valve but rather an electric joystick like the you would use in a video game and an electrical signal is sent to activate a solenoid that does the same thing but can be much farther away from the operator. Solenoid Actuated Pneumatic Spool ValveA solenoid actuated pneumatic spool valve is a spool valve actuated by an electric solenoid. They are often used in industrial automation and are usually controlled by a PC or a PLC (Programmable Logic Controller) rather than a manual switch. To reduce the size and power consumption of the solenoid, often the solenoid does not directly actuate the spool. Instead, the solenoid actuates a small internal valve which directs upstream air pressure to move the spool. This is called an air piloted solenoid actuated pneumatic spool valve. The air pilot mechanism typically requires about 40 PSI to operate reliably. If the air pressure upstream of the valve is going to be less than 40 PSI, the valve must be externally piloted, meaning that the pilot is connected to a separate air source which is above 40 PSI.
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