Mechanical seals are unique because they consist of a rotating part, a stationary part, and a spring. The seal forms the interface between the moving and stationary components. Sealing this junction is challenging, and the spring ensures adequate pressure to maintain the seal despite movement. To be effective, mechanical seals must be designed precisely for the specific application, as conditions like temperature, pressure, and chemical exposure can vary widely.
Mechanical seals must also be manufactured with precise measurements and suitable materials to withstand extreme temperatures and harsh chemicals. If the seal is not designed correctly, failure is inevitable. While some seals are custom-made for unique applications, most can be grouped into eight main types of mechanical seals.
1. Wave Spring Mechanical Seals
Wave spring seals are ideal for liquids with high viscosity. They are widely used in pharmaceutical, dairy, brewery, and food processing industries. Some designs are specially made to fit shallow or confined seal housings.
2. Water Pump Seals
Water pump seals require materials that can withstand the low lubricating properties of water. They are commonly used in shower pumps, irrigation systems, heating systems, swimming pools, and spas.
3. Seat Bi-Directional Mechanical Seals
Using wave spring technology, bi-directional seals can be made with or without anti-rotation pins. They are capable of handling higher-temperature media and are extensively used in chemical processing.
4. Diaphragm Seals
Diaphragm seals feature parallel springs and are used in a wide variety of applications, including agitators, compressors, mixers, pumps, and other rotary equipment. They protect pressure-sensing instruments from the process fluid.
5. Balanced Diaphragm Seals
Balanced diaphragm seals incorporate a patented design to prevent seal failure in applications where thin metal components might damage the retainer. They use a bellows disk to avoid direct contact with the shaft.
6. Conical Mechanical Seals
Conical seals are versatile, robust, and durable. Available in a wide range of materials, they suit numerous industrial environments.
7. Parallel Mechanical Seals
Parallel seals use various methods to provide the sealing face and can be supplied with left- or right-hand wound springs. They are a reliable general-purpose option for marine pumps, wastewater systems, pulp and paper, textile applications, and refrigeration compressors.
8. Bellows Mechanical Seals
Bellows seals are non-clogging, self-adjusting, and highly reliable, making them ideal for hygienic applications or media containing solids. They are available in various sizes and can also be custom-made.
With so many types of mechanical seals available, selecting the right one for your equipment can be challenging. If you are unsure which seal is best suited for your application, our experts can help you evaluate your requirements and recommend the most appropriate solution.