The core function and working principle of stainless steel liquid ammonia flow limiting valve
Stainless steel liquid ammonia flow limiting valve (such as YG41W type, MT-980 series) is a safety protection valve specially designed for pipeline systems of liquefied petroleum gas, liquid ammonia, natural gas and other media. Its core function is to automatically monitor the flow rate of the medium, and immediately close the valve when the flow exceeds the set threshold or when there is a sudden leak in the pipeline, to prevent the accident from escalating.
Technical Features
1. Automatic opening and closing mechanism
Using the principle of dynamic balance between spring preload force and medium pressure, when the flow rate is abnormal, the pressure difference pushes the valve core to quickly close, with a response time as short as milliseconds.
2、 材料安全性
The valve body is made of 316L stainless steel, which is resistant to low temperature corrosion (-40 ℃ to 150 ℃). The sealing surface is commonly made of PTFE or hard alloy to ensure long-term sealing in liquid ammonia medium.
3. Fault self recovery
After the accident is eliminated, the valve can automatically reset to the operating state without manual intervention.
Typical application scenarios
•Tank protection: Installed at the liquid phase outlet of the liquid ammonia tank to prevent overcurrent during loading and unloading.
•Pipeline safety: Used for urban gas pressure regulating stations and chemical plant pipelines as a secondary safety guarantee.
Selection and installation points
•Parameter matching: The model should be selected based on the nominal pressure of the pipeline (PN2.5/4.0MPa) and the flow range (such as the DN25 valve limiting flow rate of 160L/min).
•Installation location: Priority deployment at critical nodes of tank inlet and outlet or pipeline, and regular testing of response sensitivity.