Comparison of Mechanical Seals and Hydraulic Seals
Generally, people find it difficult to distinguish between mechanical seals and hydraulic seals, often assuming they are one and the same.
1.On Mechanical Seals and Hydraulic Seals
Mechanical seals are precision components and one of the more structurally complex types of fundamental mechanical elements; they serve as critical parts in various types of equipment, including pumps, reaction vessels, turbocompressors, and submersible motors. Their sealing performance and service life depend on numerous factors, such as proper selection, machine precision, and correct installation and operation.
Hydraulic seals are subject to specific pressure requirements and necessitate a certain degree of surface finish on the mating surfaces. The sealing elements typically consist of rubber, achieving a sealing effect through localized deformation of the seal components.
2. Classification of Mechanical Seals and Hydraulic Seals
Mechanical Seal Models: Cartridge seal series, light-duty mechanical seal series, heavy-duty mechanical seal series, etc.
Hydraulic Seals: Lip seals, V-rings, U-rings, Y-rings, YX-rings; the composite seals commonly used in hydraulic cylinders primarily include cup seals, Glyd rings, and Step seals.
3. How to Select Seals
Guangzhou UP-SEAL Technology Co., Ltd. specializes in the import, sales, and wholesale of oil seals and sealing components from major brands, guaranteeing authenticity and reliable quality.
When purchasing seals for maintenance purposes, most users tend to make their selections based solely on the dimensions and color of existing samples. This approach not only complicates the procurement process but also fails to guarantee the selection of a suitable product. To enhance the accuracy of seal procurement, the following procedure is recommended:
1. **Direction of Motion:** First, determine the direction of motion at the seal's location—for instance, reciprocating, rotary, helical, or stationary.
2. **Sealing Focus:** Identify the specific area requiring sealing—for example, whether the dynamic interface is at the inner diameter (as with a rod seal) or at the outer diameter (as with a piston seal).
3. **Temperature Rating:** Determine the operating temperature by consulting the original equipment manufacturer's (OEM) manual or by assessing the actual working environment; this will enable you to select the appropriate material. For further details regarding temperature ratings, please refer to the "Notes for Users" section below.
4. Pressure Rating—Consult the relevant data in the original equipment manufacturer's (OEM) mechanical instruction manual, or infer the working pressure rating by observing the hardness and structural characteristics of the original seal. For further details regarding pressure ratings, please refer to the "Notes for Users" section below.
5. Dimensions—Most users select replacement seals based on the old, used samples they are replacing. However, after a period of service, a seal's original dimensions can be significantly altered by factors such as temperature, pressure, and wear. Therefore, selecting a replacement based solely on a physical sample should serve merely as a reference; a more accurate approach is to measure the dimensions of the metal housing groove in which the seal is seated.