For a glass tube level gauge, selecting the appropriate seal ring is crucial to ensure proper sealing and functionality. Here's a brief overview of each type of seal ring you mentioned and considerations for their use:
Nitrile Rubber Ring (NBR):
NBR is commonly used for sealing applications due to its excellent resistance to oil, fuel, and other petroleum-based fluids.
It offers good resistance to abrasion and tearing.
Suitable for moderate temperatures and pressures.
Check compatibility with the fluids and temperatures present in your application.
Silicone Rubber Ring:
Silicone rubber has excellent resistance to extreme temperatures, both high and low.
It is known for its flexibility, durability, and resistance to ozone and UV light.
Ensure compatibility with the chemicals and temperatures in your application.
Silicone rubber may not be suitable for applications involving certain hydrocarbon-based fluids.
PTFE (Polytetrafluoroethylene) Rubber Ring:
PTFE offers exceptional chemical resistance, including resistance to most acids, bases, and solvents.
It has a wide temperature range and is suitable for both high and low temperatures.
PTFE is non-reactive, making it suitable for use in various industries, including food and pharmaceutical.
Ensure proper sizing and compression to achieve a reliable seal.
Fluoro Rubber Ring (FPM or FKM):
Fluoroelastomers such as FKM or FPM offer excellent resistance to high temperatures and a broad range of chemicals.
They are commonly used in applications involving aggressive chemicals and high temperatures.
Check compatibility with specific chemicals and operating temperatures.
Fluoroelastomers can be more expensive compared to other rubber materials.
When selecting a seal ring for your glass tube level gauge, consider factors such as chemical compatibility, temperature range, pressure rating, and environmental conditions. It's also essential to ensure proper installation and maintenance to maximize the seal's effectiveness and longevity.