The Bellows Sealed Globe Valve for Ammonia is equipped with an additional bellows assembly at the valve stem position in the valve cavity of the ammonia globe valve. It is mainly used for corrosive fluids such as ammonia gas and liquid ammonia, and can effectively prevent the sealing packing failure caused by frequent opening and closing of the valve stem. The bellows seal and packing seal work together to form a dual seal, ensuring the reliability of the axial dynamic seal. Since the packing is prone to leakage during long-term use, a loaded packing compression mechanism is adopted in the design to make the packing seal more durable and reliable.

Technical Parameters

Nominal Diameter: DN15 ~ DN200
Nominal Pressure: PN1.6 ~ PN4.0 MPa
Operating Temperature: -29℃ ~ 200℃
Applicable Media: Chlorine, Alkali, Ammonia

Structural Features

Ordinary valves suffer from poor corrosion resistance and easy shell perforation. According to medium characteristics, ammonia valves adopt corrosion-resistant steel (carbon steel with anti-corrosion alloy elements) for valve bodies. The material delivers good corrosion resistance and can operate down to -40℃ to meet working requirements.

The sealing pair of ammonia valve adopts ball-to-plane matching structure with automatic sealing compensation to realize double protection. It features stable sealing performance and avoids adhesive wear, effectively solving common problems of ordinary pipeline valves such as inferior tightness and leakage.

The middle flange of the valve adopts tenon-and-groove sealing structure, which ensures reliable sealing even under fluctuating pipeline pressure.

Multi-layer PTFE sealing materials are adopted in the upper sealing assembly to form combined sealing. It guarantees zero medium leakage from the stuffing box within the service life, eliminating risks of medium leakage and accidents caused by weak stuffing box sealing on conventional valves.

Product Performance Specification

Operating Temperature: -29 ~ 425℃
Applicable Media: Ammonia gas, liquid ammonia, water, steam, hot oil, oil products, etc.

Main Parts Materials List

Applications of Bellows Sealed Globe Valve for Ammonia

The ammonia globe valve that uses a bellows as the valve stem sealing element is called the Bellows Sealed Globe Valve for Ammonia. It uses a bellows to replace the stuffing box on ordinary valves or is used in conjunction with the stuffing box. It is often used in occasions with strict requirements on valve stem sealing, such as refrigeration, power plants, ammonia stations of chemical plants (liquid ammonia storage tanks), gas stations, and liquefied gas stations.

The Bellows Sealed Globe Valve for Ammonia is designed to prevent external leakage of the valve stem during the opening and closing reciprocating movement of the valve. It is applied to materials with toxic, volatile, and radioactive media. At the same time, a standard or environmentally friendly stuffing box structure (graphite or PTFE sealing rings) is adopted on the bellows sealing element, which can avoid leakage in case of bellows rupture and failure. Therefore, attention should be paid to observing whether there is external leakage at the valve stem packing during daily use. If the packing leaks, the bellows valve may have problems and should be replaced in time.