1, different types of mechanical seals for different pumps
First of all , i’d like to write some about classification of mechanical seals. About application of mechanical seal types, some can be used in centrifugal pumps, water pumps, oil pumps etc. In different pumps, we will choose different material.
2,what is a mechanical seal ?
All mechanical seals are made of three basic point of components,typically as following:
(1)A set of primary seal faces: one that rotates and the other one is stationary.
(2)A set of secondary seals known as shaft packings and insert mountings, such as O-rings, PTFE or graphite wedges, or V-Rings.
(3)different hardware like gland rings, collars, compression rings, pins, springs, retaining rings and bellows.
Generally, there are different types of mechanical seals. In terms of design and arrangement.
3,Do want to know more about mechanical seal types parts name and function ?
As one of professional mechanical seal manufacturer in china, we would like to give you a list of mechanical seal of parts name.
As following photo, This is one of eagleburgmann brand mechanical seal. It is made up by seal face , rubber seal, and metal part.
- Seal face : Silicon carbide
- Rubber seal: Viton
- Metal part: 304 stainless steel
The dynamic and static rings of the sealing surface are joined and rotated with each other, and the sealing surface is kept in the joint state by the compensation function of the spring. And under the action of auxiliary static seal, the medium in the pump cavity is sealed.
4,What is difference between balanced mechanical seal types and unbalanced mechanical seal types ?
Equilibrium type: It can partly or totally balance the effect of liquid pressure on the end face, but the partial equilibrium load coefficient is usually 0 < K < 1. The specific pressure of the end face increases slowly with the increase of liquid pressure, which improves the wear condition of the end face and makes the structure more complex.
It is suitable for the occasion of high liquid pressure. For general liquids, it can be used for 0.7-4.0 MPa, even up to 10 MPa, Pc_ delta is 90-200 (MPa m) / s, and for liquids with poor lubricity, low viscosity and density less than 600_ _ m3 (such as liquefied gas), it can be used for the occasion of high liquid pressure.
Non-equilibrium type: the effect of liquid pressure on the end surface can not be balanced. The specific pressure of the end surface increases with the increase of liquid pressure. Load coefficient K > 1. At higher liquid pressure, the increase of specific pressure of the end surface is easy to cause wear and tear, and the structure is simple.
It is suitable for low liquid pressure occasions. For general liquids, it can be used for sealing pressure less than 0.7 MPa, Pc_ delta less than 4-6 (MPa m)/s, and for lubricating poor and corrosive liquids, it can be used for pressure less than 0.3-0.5 MPa.
5,cartridge seal vs. mechanical seal
The cost of installation and maintenance of cartridge mechanical seals is higher than mechanical seals.
Price of cartridge mechanical seal is much more expensive than mechanical seal.
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