With the continuous evolution of the global energy structure, liquefied natural gas (LNG), air separation units, and cryogenic technology have been widely promoted in the fields of energy transmission and distribution, industrial gases, and special processes. Low temperature conditions pose higher requirements for the safety, sealing, and maintenance performance of fluid control equipment. As the core component of system operation, the structural design, material selection, and manufacturing process of valves directly affect the stability and operating life of the device.

Based on deep engineering practice and R&D capability, Tiangong Valve Group Co., Ltd. launched a side mounted three eccentric butterfly valve (specification: DN900, PN16, Material: CF3, working temperature: -196 ° C) for extreme low temperature environment, which meets the strict demand of many industries for high reliability control equipment under low temperature conditions, and demonstrates the continuous innovation capability in high-end valve manufacturing.

Application adaptation: customized for low-temperature environments

This type of butterfly valve is widely applicable in the following scenarios:

Liquefied natural gas (LNG) storage, transportation and regasification system

Low temperature medium cut-off in air separation unit

Control of refrigeration and cryogenic process flow

Other -196 ° C industrial low-temperature conveying systems

In response to the common problems of low-temperature embrittlement, sealing shrinkage, and thermal stress impact in the above working conditions, the product adopts CF3 austenitic stainless steel material, which has excellent low-temperature toughness, corrosion resistance, and stable mechanical properties, ensuring that the valve still has long-term stable operation ability in extremely cold environments.

Structural optimization: Three eccentric sealing system

The valve adopts a classic three eccentric sealing structure, and its geometric design enables the sealing pair to achieve "non frictional disengagement and fit" during the opening and closing process. Specific advantages include:

When the valve disc opens, it automatically disengages from the sealing surface to avoid unnecessary wear and mechanical interference

Quickly establish linear contact when the valve is closed, ensuring that the sealing pair is fully adhered

Realize metal to metal sealing, suitable for low temperature, corrosive and volatile media

Meet the requirements for sealing tightness under API 598 or equivalent standards (such as Class VI)

The structure is particularly suitable for the application environment with high frequency opening and closing, severe temperature fluctuation or unstable medium Pressure, and shows excellent sealing retention ability and structural reliability in long-term operation.

Detail design ensures operational stability

To ensure stable operation and convenient maintenance of the entire machine in extremely cold environments, Tiangong has carried out the following engineering design optimizations on key structures:

1. Whole process quality monitoring system

The whole process quality management covers casting, machining, assembly, low-temperature testing, and sealing inspection, ensuring that each valve passes strict performance and sealing tests before delivery, meeting industry standards and user customization requirements.

2. Drip tray insulation structure

Add a drip tray structure in the valve body packing area to slow down the heat transfer from the valve body to the packing chamber, reduce the cold bridge effect, extend the service life of the sealing packing, and effectively ensure long-term low-temperature sealing performance.

3. Dynamic live load bolt system

Equipped with a high-performance dynamic live load fastening system, it can automatically compensate for the fluctuation of packing compression force caused by thermal expansion and contraction, reduce manual adjustment frequency, and ensure the stability and operational reliability of long-term sealing effect.

Convenient maintenance and extended lifecycle

The later maintenance of traditional low-temperature valves is often limited by factors such as complex structural design and difficulty in disassembly and assembly. The Tiangong butterfly valve adopts a valve body structure with an inspection port, greatly simplifying the on-site maintenance operation after valve installation, supporting the replacement of key components, extending the service life of the whole machine, and improving the return on investment of the equipment.

This low-temperature three eccentric butterfly valve is the result of Tiangong Valve's independent research and development based on typical low-temperature application scenarios, fully reflecting the company's comprehensive control capabilities in material adaptation, sealing structure, and maintenance convenience. The product has demonstrated good stability in multiple complex environments, verifying its engineering applicability and reliability.

In the future, Tiangong will continue to focus on the actual needs of customers, and with more mature product technology and service system, help the global fluid control industry operate safely and efficiently under extreme working conditions.