Mechanical seal, graphite ring

The mechanical seal is devices that serve to separate yourself from space with two substances with different temperatures, pressures, or physico-chemical properties.

Mechanical seals in recent years received the widest distribution in pump engineering turn out. Mechanical seals used for pumping liquids and gases (including radioactive, corrosive environments used in chemical, petrochemical and other industries), which seal is required virtually complete sealing. They perform with their carts external and internal the sealing medium, single, double, triple, etc.

Mechanical seals have the following advantages: small leaks (0.05 l/h until they are almost complete absence), high durability (from 10 000 to 20 000 hours or more), the possibility of use at high pressures before the seals (up to 30 MPa and above), and when the vacuum, no need for constant observation and etc.

Since, at the expense of their use significantly reduced the cost of energy to friction, relative to the o node, reduced loss of fluid that is pumped through the seal, eliminates the need for daily maintenance of pumps that allow to transfer equipment and pumps for the automatic mode of operation, in some examples, completely solve the environmental problems.

There are the following types of mechanical seals: single mechanical seal; double mechanical seal (back-to-back - back-to-back"; "face-to-face", "face-to-face; tandem); the seal cartridge type single cartridge seal; double cartridge seal: back-to-back - back-to-back"; "face-to-face" - "face-to-face"; the tandem).

For the manufacture of friction pairs applies a wide range of wear resistant materials with top quality, including impregnated resin graphite.

For firming and enhancing characteristics such combinations are used, as graphite-silicon carbide, graphite-ceramics, graphite-tungsten carbide.

Mechanical seal is one of the most important components of pumping equipment. But correctly chosen end mechanical seal plays a major role in the operation of the pump.

Types of mechanical seals are great many, but a major role in the design of the play of the friction pair. For a clean, not abrasive liquids, it is proposed that the graphite ring on the ceramic insert, for abrasive liquids — silicon carbide on silicon carbide (SIC/SIC). The differential temperatures, the expert will always suggest the insertion of graphite on the stainless ring.

Second, an integral part of the end mechanical seals — o-rings and bellows. Worth make a mistake in the selection, for example to offer on vegetable oil material EPDM, and within a few shifts, the seal will be damaged.

Proper selection of the end mechanical seal always depends on correctly given data (liquid temperature, presence of abrasive material, grain size and the differential temperatures).

Mechanical seal options notation:

- mechanical seal, graphite ring mark..., D=30, the drawing is attached

- mechanical seal, graphite ring mark..., D=100, a drawing is attached

- mechanical seal, graphite ring mark..., D=500, the drawing is attached

- mechanical seal, graphite ring mark..., D=1200, the drawing is attached