The liquid ammonia bellows globe valve is a valve specifically designed for low-temperature, toxic, or leak prone media such as liquid ammonia (NH3). It adopts a bellows sealing structure to ensure zero leakage and is suitable for industries such as chemical, refrigeration, and fertilizer.

Application scenarios

Liquid ammonia storage and transportation system: tank truck, pipeline transportation.

Refrigeration system: Industrial refrigeration equipment (such as cold storage and chemical refrigeration).

Fertilizer production: synthetic ammonia and urea production lines.

High risk areas: chemical industrial parks that require strict leak prevention measures

Key selection points

Pressure rating: Choose PN16/PN25 or Class 150/300 based on the system pressure, taking into account the vaporization pressure of liquid ammonia.

Temperature range: Ensure that the material is suitable for low temperatures below -30 ℃ and avoid cold brittleness.

Connection method: flange (RF/RTJ), threaded or welded end (SW), in accordance with HG/T 20592 and other standards.

Bellows material: 316L stainless steel has better corrosion resistance, and high-purity liquid ammonia can be selected with Inconel.

Certification requirements: CE, API 602 (Compact Globe Valve), TS (Special Equipment License).

Maintenance and troubleshooting

Regular inspection:

Whether the corrugated pipe is damaged (leakage can be detected through the valve cover exhaust hole).

Wear condition of valve seat sealing surface (liquid ammonia may contain impurities causing erosion).

Operating specifications:

Avoid water hammer caused by rapid opening and closing (large fluctuations in liquid ammonia vaporization pressure).

The manual valve should be fully open or fully closed to prevent the sealing surface from being washed away by the half open state.

Replacement cycle: The general lifespan of corrugated pipes is 5000-10000 cycles, and replacement should be planned according to the frequency of use.