What is the rail pressure control valve?
The Fuel Pressure Relief Valve (PRV) on heavy equipment and generators is usually found on the high-pressure pump or on the common rail. This pressure relief valve is responsible for regulating the fuel pressure in the fuel rail.
What does a fuel rail pressure valve do?
The FPR is normally mounted after the fuel rail. This ensures that the fuel rail has priority in fuel flow. The valve in the FPR controls the amount of fuel that is bled from the fuel rail by opening an outlet port. This allows fuel to flow back into the fuel tank.
What happens when fuel pressure is too high?
Too high of pressure may result in, over fueling of the engine. As a result, this can lead to a rough running engine; poor fuel mileage, and black smoke coming from the exhaust. If your regulator is going bad, your car could display several different symptoms.
How does a pressure control valve work on a common rail?
One way is to supply more fuel than is needed to the common rail and use a high pressure regulator—commonly referred to as a pressure control valve—in the high-pressure circuit to spill the excess fuel back to the fuel tank. In this approach, the pressure control valve position is the control system input.
Where is the oil pressure relief valve located?
To address this, there’s a pressure relief valve located at the oil pump outlet. Its purpose is to open when engine oil pressure reaches a certain value. A problem with the pressure relief valve can cause damage to the engine oil filter and to the engine itself.
What happens when a pressure relief valve is stuck?
• A pressure relief valve that is stuck open can allow too much oil to bleed off. This results in a lack of oil pressure and catastrophic engine damage. • A valve stuck closed will result in excessive oil pressure. This can blow out the oil galley plugs in the engine block.
How does the overflow valve in an injection system work?
The overflow valve (1) remains closed until the spring force acting one side balances the pressure force acting on the other side. As soon as the pressure force increases to offset this balance, the valve opens to discharge excess flow (Q 1) and regulate the inlet pressure according to injection system fuel demand.