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Where shall the pressure relief valve and common rail be installed?

Author: Site Editor     Publish Time: 2022-06-29      Origin: Site


1. The diagram of Bosch Fuel System reference metering valve 0928400752 with pressure relief valve

0928400752_MEASURING_UNIT_HIGH-PRESSURE_PUMP_0445020509


0928400752 MEASURING UNIT, HIGH-PRESSURE PUMP 0445020509


pressure_limiter_valve_made_by_Henshine

pressure_limiter_valve_made_by_Henshine_2




FIG

FUEL INJECTION VALVE (T554)

Year/Month


T555STGBC

01-Sep-21

KEY NO

PART NO

DESCRIPTION

SPEC

QTY

REPAIR

EFFECTIVE DATE

REMARKS

1

129A01-53100

INJECTOR ASSY


4




2

129A01-53000

NOZZLE ASSY , INJECTOR


4




3

129A00-53080

NUT , NOZZLE


4




4

129A00-53200

RING , RETAINING


4




5

129A00-53210

PIN


8




6

129C00-57000

RAIL ASSY






7

129A00-57100

SENSOR,RAIL PRESSURE


1




8

129A00-57200

VALVE ASSY , PLV4


1




9

129A00-57210

O-RING , PLV4


1




10

26106-080252

BOLT,M8X25 PLATED






11

122780-59100

RETAINER


4




115

129A00-51000

PUMP ASSY,FUEL


1




115

129A00-51100

VALVE ASSY,MPROP


1






metering_valve_0928400752

Tractor 4JH45 2.2 L with pump assy 129A00-51000 including metering valve 129A00-51100 0928400752


metering_valve_0928400752-pc2

relative item 0928400752 fuel metering valve on high-pressure pump


Fuel is now forced into the high-pressure chamber, which moves the pump plunger downwards (intake stroke).



If the BDC position of the pump plunger is exceeded, the inlet valve closes due to the increasing pressure in the high-pressure chamber. The fuel in the high-pressure chamber can no longer escape.



As soon as the pressure in the high-pressure chamber exceeds the pressure in the fuel rail, the outlet valve opens and the fuel is forced into the fuel rail via the high-pressure connection (delivery stroke).



The pump plunger delivers fuel until TDC is reached.

The pressure then drops so that the outlet valve closes.



As the pressure on the remaining fuel is reduced, the pump plunger moves downward.


Rail_pressure_relief_valve_111_001_0020

Rail pressure relief valve 111 001 0020


pressure_limiter_valve_made_by_Henshine_3



2. The diagram of Denso Fuel Injection System

2_The_diagram_of_Denso_Fuel_Injection_System


pressure_limiter_valve_made_by_Henshine_4



Diesel components from DENSO

Operation

The fuel pressure on the fuel rail is given by

Fuel rail pressure sensor. If the fuel pressure becomes

Too large, the pressure limiting valve opens,

Drain excess pressure into the fuel drain circuit.

move

The fuel pressure limiting valve is located at

Top of fuel rail (Figure 20).



3. Pic. of Scania High-pressure pump with the metering valve 2024377

Scania_High-pressure_pump_with_the_metering_valve_2024377


(2)Scania_High-pressure_pump_with_the_metering_valve_2024377


(3)Scania_High-pressure_pump_with_the_metering_valve_2024377



Pressure_Limiter_Valve_location

Pressure Limiter Valve location


Operation of the high-pressure common rail


Various rail assembled components are fitted on the high-pressure rail depending on the system configuration. The rail pressure sensor (RPS) installed on the high-pressure rail communicates with the control unit. The transmitted pressure values serve to regulate the system pressure and control the injectors. The pressure control valve (PCV, PCVN) sets the system pressure supplied by the control unit in the rail. The pressure limiting valve (PLV) reduces the system pressure in case of overload and thus protects the other injection components from damage.



If abnormally high pressure is generated, the pressure limiter opens to relieve the pressure. If the pressure inside the rail becomes abnormally high, the pressure limiter will work (open). Operation resumes (shutdown) after the pressure drops to a certain level. Fuel released by the pressure limiter returns to the fuel tank.



The working pressure of the pressure limiter varies with the model, the valve opening pressure is about 140-230MPa, and the valve closing pressure is about 30-50MPa.




Pressure Limiter Valve located in Engine 1KD-FTV & 2KD-FTV for Toyota Hilux/Kijang Innova

TOYOTA-HILUX--KIJYANG-INNOVA-1KD-2KD_08



Rail

 outline

 *stores pressurized fuel (0 to 160 MPa) that has been delivered from the supply pump and distributes the fuel to each cylinder injector. A rail pressure sensor and the pressure discharge valve (low-pressure valve) are adopted in the rail.

*The rail pressure sensor (PC sensor) detects fuel pressure in the rail and sends a signal to the engine ECU, and the pressure limiter controls the excess pressure. This ensures optimum combustion and reduces combustion noise.


Reference_Pressure_Limiter_Valve_095420-0422_with_common_rail_23810-0L010


Reference Pressure Limiter Valve 095420-0422 with common rail 23810-0L010


Pressure Limiter

The the pressure limiter opens to release the pressure if an abnormally high pressure is generated

The_Pressure_limiter_valve_095420-0422_Exploded_View


The Pressure limiter valve 095420-0422 Exploded View


Common_rail_23810-0L010_Henshine_Precision

Common rail 23810-0L010 Henshine Precision


Pressure_relief_valve_fitted_on_Common_rail_23810-0L010_Henshine

Pressure relief valve fitted on Common rail 23810-0L010 Henshine


The common rail system consists primarily of a supply pump, rail, injectors, and engine ECU.

The_common_rail_system_consists_primarily_of_a_supply_pump_rail_injectors_and_engine_ECU

CRDI P.R.V(pressure relief valve) WORKING EXPLAINED


4.  The diagram of Fuel Injection System on the engine LNP Z20D1 2000CC for Opel/Chevrolet

The_common_rail_system_in_LNP_Z20D1_2000CC

The common rail system in LNP Z20D1 2000CC


The_fuel_pump25184341_common_rail_system_in_LNP_Z20D1_2000CC

The fuel pump25184341 common rail system in LNP Z20D1 2000CC


Actually, there is no pressure limiting valve on this high-pressure common rail and through the cutaway in EPC catalog, we can see that the metering valve is 28233374(refer to letering) , the OEM are GM 25187791/OPEL 48 19 468 & etc. noted in our system. The following OE list is all reference with this kind “Inlet Metering Valve”. Under same egnine LNP Z20D1 2000CC, the rail pressure sensor is 9307Z528A and sensor letering is 55PP30-01 (in the following pc.)

All the information courtesied of Ningbo Henshine Precision Machinery Co., Ltd.


28233374_Common_Inlet_Metering




OE

OEM

PUMP ASSY

COM. RAIL

LETERING

LIMITER  OE

SENSOR OE

LETERING

ENGINE

28233374

28508414
7135-818 DELPHI

OPEL
48 19 468

OPEL
48 19 268

48 02 196



9307Z528A

55PP30-01
MY A
序列号


GM
25187791

GM
25184341
28286124

96868901

/

/

LNP Z20D1 2000CC

GM
25187376
28318140







MERCEDES-BENZ
A 651 074 00 84

MERCEDES-BENZ
A 651 070 18 01
28343143


More in “KNOWLEDGE



Hyundai/Kia
33115 2A700

Hyundai/Kia
33100 2A710
28277574





DOHC - TCI
1.4 CRDi 90 (1400 CC - U2)

Hyundai/Kia
33100 2A700
28239554






DOHC - TCI
1400 CC - U2


VW AG
04B 130 755 E
28395883







Hyudnai/Kia
33115 4A000

Hyudnai/Kia
33100-4A700
9422A060A









FLOW CONTROL VALVE 28233374 fitted on FUEL PUMP OEM 28343143

FLOW_CONTROL_VALVE_28233374_fitted_on_FUEL_PUMP_OEM_28343143


Fuel pump A6510701801-28343143 including fuel flow control valve A 651 074 00 84

Fuel pump A6510701801-28343143 including fuel flow control valve A 651 074 00 84


Rail_pressure_sensor_55PP30-01_OE_9307Z528A-Henshine_Precision_Machinery

Rail pressure sensor 55PP30-01 OE 9307Z528A-Henshine Precision Machinery


No_pressure_limiter_valve_on_Fuel_common_rail_96868901_with_pressure_sensor_55PP30-01-Henshine_Precision_Machinery

No pressure limiter valve on Fuel common rail 96868901 with pressure sensor 55PP30-01 - Henshine Precision Machinery



For example common rail location in Engine D4CB Euro V for Hyundai including metering valve 28233374 & rail sensor 55PP30-01



Common Rail Direct Fuel Injection is a direct fuel injection system for gasoline and diesel engines.


On diesel engines, it uses a high pressure (over 1,000 bar or 100 MPa or 15,000 psi) fuel rail to feed the individual solenoid valves instead of the low pressure fuel pump feed unit injectors (or pump nozzles). The third-generation common rail diesel engine is now equipped with piezoelectric injectors for increased precision, with fuel pressures up to 3,000 bar (300 MPa; 44,000 psi).



In common rail direct injection, the onset of combustion occurs directly in the main combustion chamber located within the cavity at the top of the piston crown. Today, CRDi technology is widely used to overcome some of the shortcomings of conventional diesel engines, especially slow, noisy and poor performance when implemented in passenger cars. CRDi technology works in conjunction with the engine ECU that takes input from various sensors to calculate precise fuel quantity and injection timing. In CRDi, the fuel system components are smarter and electrically/electronically controlled. Traditional fuel injectors are replaced by advanced electric solenoid injectors. The injectors are turned on by signals from the ECU, depending on variables such as engine speed, load, engine temperature, etc.



In a common rail system, the "common to all cylinders" fuel rail or simply the fuel distribution line is used to maintain optimal residual fuel pressure and acts as a shared fuel tank for all injectors. Fuel is continuously supplied at the pressure required for injection. In modern engines, high-pressure fuel is stored in this single line, which is then supplied to solenoid valve injectors, rather than the fuel injection pump supplying diesel fuel to the injectors in earlier designs through a separate fuel line. Components of the CRDi system. Courtesied of Ningbo Henshine Precision Machinery Co., Ltd. Pressure limiting valve production also including suction control valve, fuel flow control valve & inlet metering valve.


1. High pressure fuel pump

2. Universal fuel rail

3. Fuel injector

4. The work of the engine control unit CRDi


Pressure is created in the high pressure pump. The pump compresses the fuel at a pressure of about 1,000 bar or about 15,000 bar and then supplies the fuel to the inlet of the rail through a high pressure line. From there, the fuel is distributed to individual injectors, which inject it into the combustion chambers of the cylinders.



Production by Ningbo Henshine Precisison Machinery

6C1Q9H321AB_Diesel_Common_Rail_Denso_Pressure_Relief_Valve_Limiting_Valve

6C1Q9H321AB Diesel Common Rail Denso Pressure Relief Valve Limiting Valve


Pressure limiter valve 6C1Q_9H321_AB Diesel Common Rail

Used on:

    Ford Transit MK7 2006 > 2.2 TDCI 2.4 TDCI

    Land Rover Defender 2.4

    LR006866, 1497165

*Condition:  Brand NEW

*Manufacturer Number:  6C1Q9H321AB

*Other Number:  1920NL, 1497165


    6C1Q-9H321-AB, 6C1Q9H321AB

*Brand:  HENSHINE


The pressure limiter valve is located on the fuel common rail in the fuel system with then main parts: the fuel pump & the common rail. Usually, the high-pressure pump(fuel pump) is fitted on the side of the engine.  Meanwhile,


(PRV)Pressure_Relief_Valve_in_the_Common_Rail_System

(PRV)Pressure Relief Valve in the Common Rail System


Stores pressurized fuel (0 to 160 MPa) delivered from the fuel supply pump and distributes the fuel to each cylinder injector. Rail Pressure Sensor and Pressure Relief Valve

The guide rail adopts (low pressure valve).


RE536274_Pressure_limiting_valve_fitted_on_John_Deere_common_rail_RE543322

RE536274 Pressure limiting valve fitted on John Deere common rail RE543322


RE536274_Pressure_limiting_valve_for_John_Deere_common_rail_RE543322

RE536274 Pressure limiting valve for John Deere common rail RE543322


Pressure_limiter_valve_fitted_on_John_Deere_common_rail_RE543322

Pressure limiter valve fitted on John Deere common rail RE543322


Through compared with different engine types we can know about the position of the common rail clearly. Then, against the high-pressure fuel rail, which types the corresponding rail limiter valve will be fitted on.


N98-ND6091E_engine_display_the_common_rail_including_rail_pressure_control_valve

N98-ND6091E engine display the common rail including rail pressure control valve


The latest developments in diesel technology have given us direct injection, common rail technology, multi-stage injection and variable geometry turbochargers.


The engine management system controls the fuel pressure produced by the high pressure pump, the precise timing of electronically controlled fuel injectors, the operation of the EGR system, and the output of the turbocharger.


Compared with the advancement of gasoline engine fuel injection and management systems, the development of diesel engines, especially engine management systems, has been relatively slow.


In recent years, however, electronic diesel engine control systems have been developed to improve diesel engine efficiency and reduce exhaust emissions.


Almost all modern engines use some form of electronic engine control system.


In order for a diesel engine to operate efficiently, the right amount of fuel must be injected at the right pressure and at the right time.


Even small deviations can lead to increased exhaust emissions, increased noise and increased fuel consumption.


In a typical diesel engine, the injection process takes only a thousandth of a second and only a very small amount of fuel is injected.





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