Flow metering valve | Cold water meter lxsy-15 internal structure

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1. What is a high-pressure return circuit?

Habitual engine high and low pressure oil circuit summary: The low pressure oil circuit includes: fuel tank - fuel filter and wax - low pressure fuel pipeline - hand pump - return pipe.. The high-pressure oil circuit includes: high-pressure fuel injection pump - high-pressure fuel pipe - fuel injector assembly. Overview of high and low pressure oil circuit of common rail machine: Low pressure oil circuit includes: mailbox - fuel filter - low pressure oil delivery pipe - low pressure stage of high pressure oil pump - return pipe. High pressure oil circuit includes: high pressure fuel injection pump (including flow metering valve) - high pressure accumulator for sale (including rail, including rail pressure sensor) - high pressure oil pipe - fuel injector assembly

2. What is a PCV valve?

PCV valve is a metering control valve installed between the engine crankcase ventilation system and the intake system, used to regulate the flow rate of gas entering the intake system from the crankcase, and has the ability to prevent reverse flow.. The specific introduction is as follows: The PCV valve is composed of a valve body, a valve, a valve cover, and a spring, and the overall design is non decomposable. Its structure is compact, and all components work together to achieve gas flow control function. Core function of environmental protection and oil protection: Introduce the blow by gas (including unburned fuel vapor, moisture, and exhaust gas) in the crankcase into the combustion chamber through the intake manifold for combustion, avoiding direct emission of polluted air, while reducing the pollution of blow by gas to the oil and delaying oil deteriorat

ion. Prevent reverse flow: When the engine backfires (flame backflow to the intake system), the PCV valve closes the valve to cut off the passage between the crankcase and the intake system, preventing flames or high-temperature gases from entering the crankcase and causing danger. Working principle: Vacuum degree control: The opening of the PCV valve is adjusted by the vacuum degree inside the intake manifold. When the engine is running at low speed, the vacuum degree is low, the valve opening is small, and the blow by flow rate is low; When operating at high speed, the vacuum level increases and the valve opening increases, allowing more blow by gases to enter the combustion chamber. Dynamic flow regulation: Automatically adjust the blow by gas flow rate based on engine operating conditions (such as speed and load) to ensure a balance between combustion efficiency and emission control. For example, increasing flow at high speeds and high loads can reduce crankcase pressure, while limiting flow at low speeds and low loads can avoid affecting intake efficiency. Key feature: Unidirectional flow: Designed as a one-way valve structure, it only allows gas to flow from the crankcase to the intake system. Reverse pressure (such as backfire) will push the valve to close, blocking flow. Durability: The non decomposable design reduces maintenance requirements, but its functionality needs to be checked regularly (such as indirectly judging by detecting crankcase pressure or observing oil deterioration). The PCV valve is widely used in gasoline engines and is a core component of the positive crankcase ventilation system (PCV system). Its performance directly affects the emission compliance, oil life, and operational safety of the e

Flow metering valve | Cold water meter lxsy-15 internal structure

1. What is a high-pressure return circuit?

2. What is a PCV valve?

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