DFW100-160(I) DFW125-125(I) DFG50-160/2/3 DFG100-200/2/22 Mechanical Seals

Structural features:

1. Single-ended design with rubber bellows compensation, offering strong resistance to clogging. When in use, the spring direction does not matter.

2. The auxiliary sealing rings are made of nitrile rubber, fluoro rubber, ethylene propylene rubber, and silicone rubber.

3. Complies with ISO 3069, DIN 24960, and GB 6556 standards, offering excellent versatility.

Applicable medium:

In clean water containing oil, water, acids, alkalis, salts, as well as in wastewater and oily effluents with suspended particles.

Work parameters:

Fixed substance content: ≤10%

Warm Temperature: ≤180°C

Press Force: ≤1.5 MPa

Axis Diameter: ≤100mm

Material parameters:
Main material: 304, 316L or 2205, 2507, 1.4529
Sealing ring material: Graphite, silicon carbide, tungsten carbide

Main applications:

This type of mechanical seal is primarily used in various types of water pumps, chemical pumps, sewage pumps, wastewater pumps, and sludge oil pumps.

Common models:

DFW40-125(I)       DFW40-125A   DFW40-160(I)

DFW40-160A      DFW40-160B       DFW40-200(I)

DFW40-200A       DFW40-200B   DFW40-250(I)

DFW40-250A      DFW40-250B       DFW50-100(I)

DFW50-100(I)A      DFW50-125(I)       DFW50-125(I)A

DFW50-160(I)   DFW50-160A      DFW50-160B

DFW50-200(I)     DFW50-200A       DFW50-200B

DFW50-250(I)     DFW50-250A       DFW50-250B

DFW50-250C      DFW65-100(I)       DFW65-100A

DFW65-125(I)  DFW65-125A        DFW65-160(I)

DFW65-160A     DFW65-160B        DFW65-200(I)

DFW65-200A     DFW65-200B        DFW65-250(I)

DFW65-250A     DFW65-250B       DFW65-250C

DFW65-315(I)     DFW65-315A      DFW65-315B

DFW65-315C      DFW80-100(I)       DFW80-100A

DFW80-125(I)     DFW80-125A       DFW80-160(I)

DFW80-160A     DFW80-160B        DFW80-200(I)

DFW80-200A     DFW80-200B        DFW80-250(I)

DFW80-250A    DFW80-250B         DFW80-315(I)

DFW80-315A     DFW80-315B       DFW80-315C

DFW100-100(I)    DFW100-100A       DFW100-125(I)

DFW100-125A     DFW100-160(I)      DFW100-160A

DFW100-160B     DFW100-200(I)      DFW100-200A

DFW100-200B     DFW100-250(I)      DFW100-250A

DFW100-250B     DFW100-315(I)      DFW100-315A

DFW100-315B    DFW100-315C       DFW125-125(I)

DFW125-125A     DFW125-160(I)      DFW125-160A

DFW125-160B DFW125-200(I)      DFW125-200A

DFW125-200B     DFW125-250(I)  DFW125-250A

DFW125-250B     DFW125-315(I)  DFW125-315A

DFW125-315B    DFW125-315C       DFW150-125(I)

DFW150-125(I)A    DFW150-160(I)   DFW150-160(I)A

DFW150-160(I)B    DFW150-200(I)       DFW150-250(I)

DFW150-315(I)     DFW150-200(I)  DFW150-400

DFW150-500      DFW200-200(I)        DFW200-250(I)

DFW200-315(I)     DFW200-400(I)A       DFW200-400(I)B

DFW200-500(I)A   DFW250-250        DFW250-315

DFW250-315A    DFW250-315B        DFW250-400(I)

DFW300-250     DFW300-315       DFW300-400A

DFG25-100/2/0.37   DFG50-160/2/3

DFG80-315/2/37          DFG150-160/2/22

DFG65-315/4/5.5          DFG25-125/2/0.75

DFG50-200/2/5.5          DFG100-125/2/11

DFG150-250/2/55          DFG80-200/4/3

DFG25-160/2/1.1          DFG50-250/2/11

DFG100-160/2/15          DFG40-200/4/0.75

DFG80-250/4/5.5          DFG32-100/2/0.55

DFG65-100/2/1.5          DFG100-200/2/22

DFG40-250/4/1.5          DFG80-400/4/15

DFG32-125/2/0.75          DFG65-160/2/4

DFG100-250/2/37          DFG40-315/4/3

DFG80-500/4/30           DFG32-200/2/3

DFG65-250/2/15           DFG100-315/2/75

DFG50-200/4/1.1          DFG100-315/4/15

DFG40-100/2/0.55  DFG65-315/2/30

DFG125-160/2/22   DFG50-315/4/4

DFG100-500/4/45          DFG40-160/2/2.2

DFG80-160/2/7.5          DFG125-200/2/37

DFG50-400/4/7.5          DFG125-315/4/22

DFG40-200/2/4            DFG80-200/2/15

DFG125-250/2/55           DFG65-200/4/1.5

DFG125-500/4/75           DFG50-100/2/1.1

DFG80-250/2/22            DFG150-125/2/15

DFG65-250/4/3            DFG80-250/2/22

Note: Since pumps serve a variety of purposes, the sealing materials (friction pairs) also differ. To ensure reliable sealing performance,
The manufacturer recommends the following:
1. Clean water (without particulate matter)—Choose an alloy for the dynamic sealing pair and graphite for the static sealing pair.
2. Highly corrosive environments (conditions involving particulate matter) – For the dynamic seal pair, select silicon carbide; for the stationary seal pair, also choose silicon carbide.
3. Conditions involving particles and significant vibration—select (alloy) for the dynamic ring friction pair, and (alloy) for the stationary ring friction pair.
4. Customization is also available upon customer request. If no specific request is made, the default option will be (clear water).

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 hammering to prevent damaging the mechanical seal through friction or breakage, 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.