Description
Bellow seal Gate / Globe Check Valves
Size 1/2" through 18" ANSI 150 to 2500# Flanged and Butt weld ends.
Mfg.standard API 600/602/BS 1873/BS 1414
Special Versions : Y Type valves, Heating Jacketed, Three way valves, Fire Safe design, Cryogenic valves.
Bellow sealed Globe Control Valves
For Severe and Lethal service Applications,including Chlorine.
Bellows in PTFE/PFA/St.Steel/Hast C.
Leak tight Control Valves can be supplied with HART/SMART Positioners and other valve accessories.
Bellow seal valves, also known as bellows valves, are a type of valve that utilizes a flexible metal bellows element to provide a hermetic seal between the valve stem and the valve body. The bellows acts as a barrier, preventing the process fluid from coming into contact with the valve stem and external environment. This design offers several advantages in terms of sealing integrity, leak prevention, and protection against fugitive emissions. Here are some key features and benefits of bellow seal valves:
1. Hermetic Seal : The primary advantage of bellow seal valves is their ability to provide a hermetic seal. The flexible metal bellows forms a barrier that isolates the valve stem from the process fluid, preventing leakage and reducing the risk of contamination or fugitive emissions. The bellows maintains its integrity even under high-pressure differentials, temperature variations, or aggressive media.
2. Leak Prevention : Bellow seal valves are designed to minimize leakages, both externally and internally. The bellows eliminates the need for traditional packing materials, such as gland packing or mechanical seals, which can wear, deteriorate, or fail over time. This design reduces the likelihood of leakage and ensures long-term sealing performance.
3. Fugitive Emission Control : Bellow seal valves are widely used in applications where fugitive emissions control is crucial, such as in the oil and gas industry or chemical processing plants. By providing a secure seal, bellow seal valves help minimize the release of harmful or hazardous substances into the environment, promoting safety and environmental compliance.
4. Corrosion Resistance : Bellow seal valves are often constructed from corrosion-resistant materials, such as stainless steel or other alloys, ensuring compatibility with a wide range of process fluids. This resistance to corrosion increases the lifespan of the valve and maintains its sealing integrity over time, even in harsh or corrosive environments.
5. Reduced Maintenance : The absence of packing materials in bellow seal valves eliminates the need for frequent maintenance and adjustment. The bellows, being a flexible element, can accommodate small amounts of stem movement and thermal expansion/contraction without requiring constant adjustment or re-packing. This leads to reduced downtime, lower maintenance costs, and improved operational efficiency.
6. Wide Temperature and Pressure Range : Bellow seal valves are designed to handle a wide range of temperatures and pressures. The bellows element can withstand high temperatures, cryogenic conditions, and high-pressure differentials without compromising the seal integrity. This versatility makes them suitable for various industries and applications.
7. Application Versatility : Bellow seal valves find applications in diverse industries, including chemical processing, petrochemicals, pharmaceuticals, oil and gas, power generation, and more. They are used in processes where maintaining a reliable and tight seal is critical, such as isolation, control, or regulation of fluids in pipelines, reactors, storage tanks, or other process equipment.
It's important to note that bellow seal valves may have limitations regarding throttling capabilities, flow characteristics, and pressure drops compared to other valve types. Therefore, selecting the appropriate valve type for a specific application should consider these factors along with the advantages of bellow seal valves.