Description
Product Overview
The pressure limiting valve is installed on the side of the high-pressure common rail pipe. It automatically opens to release pressure when the system oil pressure exceeds the safety threshold, stabilizing the rail pressure, protecting the high-pressure oil circuit, injectors, oil pumps and other precision components. After long-term exposure to extremely high oil pressure, diesel impurities clogging, and internal spring fatigue and aging, there may be failure in pressure release, continuous exceeding of rail pressure, engine power limitation, damage to oil circuit components, and even pipe leakage. This product features an integrated pressure limiting valve assembly, with a factory-standard calibrated pressure release pressure, standardized thread dimensions and installation positioning. It does not require secondary processing for disassembly and assembly, and is suitable for maintenance of heavy trucks, mining machinery, and high-power generator sets with high-pressure common rail systems.
Unique core advantages of the single product
The integral zinc-plated alloy steel valve body is resistant to rust and diesel corrosion.
The overall steel is treated with hot zinc plating, which isolates the cabin moisture, diesel oil, and rust, preventing rust and sticking in open mining areas and long-term high-humidity working conditions. It does not easily rust and stick under long-term high-pressure conditions and maintains its structure without deformation.
Multiple-level hexagonal locking positions, with uniform force during disassembly and no slipping
The segmented hexagonal wrench positioning design ensures uniform force during maintenance clamping, and the tightening process will not cause valve body twisting or thread slippage. After assembly, the seal is tightly fitted without leakage.
The standard precision external thread at the top ensures strong oil circuit connection sealing
The standardized external thread connector at the top, combined with the matching sealing gasket, forms a high-pressure sealing barrier after being screwed into the common rail pipe, preventing high-pressure fuel from leaking through the thread gap, and stabilizing the rail pressure environment.
The high-precision pressure release valve core at the bottom has precise pressure response and stability
The built-in precision spring and hard alloy valve core ensure uniform calibration of the pressure release threshold. When the oil pressure exceeds the limit, it opens immediately for pressure release, and automatically closes when the pressure drops, precisely maintaining the safe working oil pressure of the system and avoiding overload damage to high-pressure components.
Integrated assembly structure reduces assembly failure points
The valve core, spring, and valve body are pre-installed and formed as a whole, eliminating the need for on-site disassembly and assembly, reducing the probability of maintenance and assembly errors, and enabling rapid restoration of the oil circuit pressure protection function after replacement.
The valve body is engraved with the part number, making inventory distinction clear
The laser-engraved 4955575 part number in the middle of the valve body is resistant to wear and diesel wiping, facilitating quick identification when repairing spare parts, matching models, and avoiding incorrect model installation. Applicable scenarios
This product is suitable for long-distance heavy-duty freight trucks with high-pressure common rail fuel supply systems, large mining excavators, heavy-duty loaders, fixed high-power diesel generator sets. It is applicable for the replacement of common rail pressure protection components in heavy-duty electronically controlled diesel engines operating under 24-hour continuous full-load conditions, with high cabin temperature vibration and high dust and impurity diesel environments.
Product Basic Parameters
Product Name: Common Rail High Pressure Limiting and Discharging Valve
Part Number: 4955575
Main Material: Galvanized alloy steel valve body, tungsten carbide valve core, high-temperature resistant pressure spring
Structural Feature: Multi-stage hexagonal locking latch, top external threaded oil passage interface, bottom precision discharge valve core, integrated pre-installed structure
Application Conditions: Ultra-high oil pressure continuous impact, cabin high-temperature vibration, outdoor dust corrosion heavy-duty electronically controlled common rail diesel engine
Product Status: New and complete limiting valve assembly, factory completed with full set of pressure relief pressure, high-pressure sealingity, and opening and closing response calibration and detection
Packaging: Single independent hard pipe protection, threaded end equipped with dust-proof plug to prevent transportation from knocking, scratching the threads and valve core, supporting single-piece retail, bulk purchase in cases, and compatible with cross-border small items / full-case logistics
