50ZD-460 50ZG-460 50ZD-500 50ZG-500 80ZG-360 80ZD-360 80ZD-420 80ZG-420 100ZD-360 80ZG-520 80ZD-500 100ZG-420 100ZD-500 100ZG-500 150ZG-500 150ZD-600 150ZD-650 200ZG-600 200ZD-600 200ZG-650 200ZG-700 200ZD-750 250ZG-650 250ZD-750 300ZD-600 300ZG-600 Mechanical seals

Mechanical seals are categorized into single-end face cartridge-type and double-end face cartridge-type.

Single-end face modular: Only 1 pair of sealed mating surfaces, Pre-assembled by the sealing manufacturer at the factory, requiring no customer adjustments—simply install as is. Easy to set up and straightforward to use. Cooling water pressure is controlled at 0.05-0.1MPa Between

Single-face seal image

Dual-end-face modular design: Consisting of 2 pairs of sealed mating surfaces, Pre-assembled by the sealing manufacturer at the factory, requiring no customer adjustments—simply install as is. Easy to set up and straightforward to use. Cooling water pressure is controlled at 0.05-0.1MPa Between

Double-End Face Seal Image          

Double mechanical seals typically refer to externally mounted double seals, which are a derivative of the single-end external design (by replacing the water-side skeleton oil seal in the single seal with a tandem-style mechanical seal assembly), aiming to extend service life.

Structural features:

Single-end (double-end) cartridge-type mechanical seal. Easy to install and simple to use. Balanced design, with optional rotation direction.

Internal working length is short. The stationary ring features multi-spring external compensation that does not come into contact with the medium.

Applicable medium:

A medium with a high content of impurities such as gypsum and lime slurry.

Work parameters:

Fixed substance content: ≤30%

Warm Temperature: ≤280°C

Press Force: ≤2.5 MPa

Axis Diameter: ≤200mm

Material parameters:
Main material: 316L or 2205, 2507, 1.4529
Sealing ring material: SSiC or SiC
Rubber material: Fluororubber or perfluoroether rubber

Main applications:

This type of mechanical seal is primarily used in flue gas desulfurization systems for coal-fired power plants, and is suitable for applications such as absorption tower slurry circulation pumps, gypsum slurry pumps, limestone slurry pumps, and gypsum discharge pumps. It can also be employed in various slurry pumps to handle a wide range of media containing particulate matter.

Common pump numbers are as follows:

40ZD-170  40ZG-190   40ZD-190 50ZD-330    65ZD-300  50ZG-460

50ZD-500  80ZG-420   80ZD-420 80ZD-360    100ZD-360  50ZG-500

50ZD-500  80ZG-520  80ZD-500   100ZG-500    100ZD-500  150ZG-500

150ZD-500  100ZG-570   100ZD-570 150ZG-600  150ZD-600   200ZG-600

200ZD-600  150ZG-650   150ZD-650 150ZG-700  150ZD-700   200ZG-650

200ZD-650  200ZG-700   200ZD-700 200ZG-750  200ZD-750   250ZG-750

250ZD-750  250ZG-650   250ZD-650 300ZG-700  300ZD-700   200ZD-850

200ZG-850  250ZG-850   250ZD-850 300ZD-900  250ZG-960   250ZD-960

300ZG-1000  300ZD-1000

Sealed model:

LH-28S2-S/SV7 LH-45S2-S/SV7 LH-65S2-S/SV7 LH-75S2-S/SV7

LH-90S2-S/SV7 LH-115S2-S/SV7 LH-130S2-S/SV7 LH-150S2-S/SV7

LH-28D3-S/SV7 LH-45D3-S/SV7 LH-65D3-S/SV7 LH-75D3-S/SV7

LH-90D3-S/SV7 LH-115D3-S/SV7 LH-130D3-S/SV7 LH-150D3-S/SV7

Installation Use Requirements :

1. The radial runout of the equipment shaft should not exceed 0.04 mm, with axial runout not exceeding 0.1 mm;
2. The sealing cavity areas of the equipment should be kept clean during installation, and sealing components must be thoroughly cleaned. Ensure that the sealing end faces remain intact to prevent contaminants and dust from entering the sealing area.
3. During installation, avoid any impact or tapping to prevent damaging the mechanical seal through friction, which could lead to sealing failure.
4. During installation, apply a layer of clean machine oil to the surfaces that will come into contact with the seal, ensuring smooth installation.
5. When installing the stationary ring gland, tighten the screws evenly to ensure the stationary ring face is perpendicular to the shaft centerline.
6. After installation, gently push the moving ring by hand to ensure it moves freely along the shaft while maintaining some elasticity.
7. After installation, manually turn the shaft—there should be no sensation of unevenness or heaviness.
8. Before starting operation, the equipment must be fully charged with the medium to prevent dry friction, which could lead to seal failure.