Advantages of Component And Cartridge
A mechanical seal consists of a rotating element and a fixed element, each with a ground, precision-smooth mating surface. Seal performance depends primarily on the condition of the face and the pressure applied to it. Other critical factors are vibration, heat, and pumping characteristics. Depending on the application and the needs of the user, different seal types may be appropriate.
For many larger centrifugal pumps, users may choose to mount assemblies or collector-type mechanical seals. Understanding the benefits and limitations of each approach can help determine the best solution for a particular application.
Large Gap Ultra-high-pressure Sealing Components
Component Mechanical Seals
Standard mechanical seals are usually component seals. When users order replacement parts, they typically receive a box containing the seal faces, retaining brackets, O-rings, boots, and other components that require the skills of an experienced pump technician to install and adjust properly.
Improper installation and adjustment are common causes of component seal failure. For example, if the seal faces are not properly seated on the shaft or in the seal housing, they can become misaligned. Sliding o-rings and elastomers over shafts shoulders, keyways, or sharp edges of seal housings can also damage these components and result in incorrect seal tension.
Seal housings typically provide limited access, so successful adjustment requires precision and accuracy. While an experienced pump technician can successfully install and adjust any component seal, this process provides the opportunity for error.
The sealing component is mainly used in hydro-static testing machines for pressure tests of steel pipes, it is applicable to the pressure testing of casings, tubings, natural gas pipes, and other steel pipes. As ultra pressure components, sealing components are very suitable for machines that require high-pressure seals.
Internal Expanding Sealing Components (Type NM)
Cartridge Mechanical Seals
Cartridge mechanical seals and component seals use similar components, but the stationary components of cartridge seals are preassembled in a housing, and the rotating components are preassembled on a shaft-mounted sleeve that is sealed with an O-ring. The cartridge seal housing typically replaces the gland cover plate and seals to the pump housing with a gasket, an O-ring, or another elastomer. Since cartridge mechanical seal components are preassembled onto the sleeve and into the cartridge housing, errors in parts installation are unlikely.
The amount of spring tension applied to the seal faces is an important factor that affects successful seal installation. On component seals, technicians can set this tension manually by adjusting the length of the installed seal spring. With cartridge mechanical seals, the spring tension is preset. To ensure the proper tension, a retaining device holds the rotating and stationary elements in alignment until after the seal is mounted.
While the details of whether a cartridge mechanical seal can be fitted to an application are complex, one criterion is whether the seal installs from the wet side or dry side of the seal chamber. Pumps with a seal that installs from the wet side, behind the impeller, are generally not candidates for cartridge mechanical seals.
In addition, submersible pumps, which are usually fitted with dual-component seals, cannot be converted to cartridge mechanical seals because the seals install from the wet side of the pump.
If you want to get more information about the mechanical seal component, welcome to contact us today or request a quote.