First ,the corrosive medium (hydrochloric acid, sulfuric acid, acetic acid, etc.)

1. Features:

Mechanical seals need bear corrosion, corrosion rate is usually no friction on the surface of the sealing surface corrosion rate of 10-50 times.

2. The requirement for mechanical seals:

The sealing ring is not only corrosion wear, auxiliary seal ring material should not only has good elasticity and resistance to corrosion and heat-resistant.Spring (required to use reliable)

3. The choice of mechanical seals:

(1) Mounted outside using mechanical seals, strengthening cooling, prevent the temperature rise.

(2) If the seal with a built-in type, spring add a protective layer, big spring coat plastic pipe, seal on both ends, or the spring surface spray coating, such as polytrifluorochloroethylene, teflon, etc.Should use big spring, because of big size, coating is peeling off.

(3) Used for mounting type bellows seal.Ring with corrugated control into an organic whole, materials for ptfe (glass fiber), the static ring for ceramic;Spring used plastic hose or coating to protect, and leakage liquid segregation,

(4) A seal for outside pressure p acuities were 0.5 Mpa.

Second, easy vaporization medium (liquefied petroleum gas, light naphtha, acetaldehyde, isobutylene, isobutane, propylene)

1. Features:

Poor lubricity, easy to make the seals between liquid film evaporation, the dry friction caused friction pair, reduce the service life of the seal.

2. The requirement for mechanical seals:

Require low friction coefficient, thermal conductivity, good friction pair material seal chamber, especially the seals have cooled sufficiently to prevent leakage of liquid ice caused the seals (depend on the atmosphere side)

3. The choice of mechanical seals

(1) The medium pressure p 0.5 MPA or less use of balance to the seal;P > 0.5 Mpa use balance seal medium pressure, the lower end face specific pressure.

(2) The use of double end face seal of unpressurized, introduced from outside sealing fluid to seal chamber

(3) The tungsten carbide friction pair material recommended - or silicon carbide graphite - graphite.

(4) Furnish throat liner to ensure that the necessary pressure in the sealed cavity, liquid between the sealing end surface temperature lower than the corresponding pressure of liquid temperature around 14 ℃.For example, the pump impeller and sealing between furnish throat bushing.

(5) Strengthen the cooling and flushing, to ensure the seal chamber temperature requirements.

(6) Using double end face sealing pressure type, but need to pay attention to the spacer can't medium pollution process, and ensure the spacer fluid pressure is higher than the sealed medium.

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