The mechanical shaft seal for pump end consists of rotating and stationary components that are tightly pressed against each other using both mechanical and hydraulic forces. Even if these components are tightly pressed together, a small amount of leakage occurs through the gap, which is related to the surface roughness.
Components –
All mechanical seals suppliers in UAE seals that have both rotating elements and stationary elements and include these main components:
- Sealing ring
- Mating ring
- Secondary sealing elements.
O-ring and mating rings are sometimes referred to as primary sealing surfaces. Primary sealing surfaces are the heart of a mechanical face seal. A common material combination for primary sealing surfaces is a hard material such as silicon carbide, ceramic or tungsten carbide, and softer material such as carbon. Many other materials can be used depending on the pressure, temperature, and chemical properties of the liquid being sealed.
The o-ring and the pairing ring are in tight contact, one ring rotates with the shaft and the other ring is stationary. Or, the ring can be rotating or stationary. Also, how the ring can be made of hard or soft material. These two rings are machined using a process called lapping in order to obtain the desired surface finish and flatness. The O-ring mechanical shaft seals for pumps are axially flexible; the mating ring is not flexible.
Sealing ring:
By definition, an O-ring is axially flexible from the end face of a mechanical shaft seal. The design of the seal ring should be such as to minimize distortion and maximize heat transfer when considering the secondary seal, actuator, spring, and ease of assembly. Many o-rings contain sealing surface diameters, although this is not required by the primary ring. The O-ring always contains the balance diameter. The shape of the O-ring seals can vary greatly depending on the inclusion of various design features that suppliers have. In fact, the shape of an O-ring is often the most clearly identifiable characteristic of a seal.
Mating ring:
By definition, a mating ring is a non-flexible mechanical seal. The design of the mating ring should be designed to minimize distortion and maximize heat transfer when considering ease of assembly and a static secondary seal. The mating ring may contain diameters of the sealing surface, although this is not a requirement of the mating ring. In order to minimize the movement of the primary ring, the pairing ring must be firmly installed and must form a perpendicular plane for the primary ring to run against. Like o-rings, jointing rings are available in many different shapes.
Secondary sealing elements:
Secondary seal elements are gaskets that provide a seal between the seal ring and the shaft (or housing) and the mating ring and the shaft (or housing). Typical secondary sealing elements include o-rings, wedges, or rubber diaphragms. Secondary sealing elements (there may be several of them) do not rotate relative to each other. The secondary sealing element for the mating ring is always axially static (although it may be rotating). Secondary sealing elements for an o-ring are described as either axially pushing or not pushing. The term pusher applies to secondary seals that must be pushed back and forth along the movement of the shaft or primary ring.
Classification –
In the UAE, there are a number of different ways in which seals can be classified and supplied. Sometimes the reference to “seal” can be with the sealing system, while other times the reference is to the device such as a gasket, O-ring, compression packing, etc. This blog deals with the mechanical printing end face.
One such classification method takes into account the design or configuration in which these functions can be used. Classification by Design Accounts for parts and functions included in one o-ring / pairing ring pair. Configuration classification includes orientation and o-ring / mating ring pair combination.
