M74S2/110-G95A, M74S2/125-G95A, M74S2/135-G95A, M74S2/140-G95A, M74S2/150-G95A, M74S2/175-G95A, M74S2/180-G95A, M74S2/190-G95A, M74S2/200-G95A – Mechanical Seals

Structural features:

1. Single-acting, multi-spring design ensures even pressure distribution across the sealing surfaces. When in use, there is no need to consider the spring rotation direction.

2. Depending on the specific application, auxiliary sealing rings can be made from nitrile rubber, fluororubber, or ethylene-propylene rubber.

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

Applicable medium:

Oil, water, acids, bases, salts, and more

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 for cooling water pumps and circulating water pumps.

Common models:

KQSN450-M9/673     KQSN500-M9/621T KQSN500-M6/757   KQSN/J400-M6/725T-F

KQSN/J450-M9/615T-F  KQSN350-M9/43 KQSN400-M19/402  KQSN350-M6/654

KQSN400-M13/470(I)   KQSN400-M13/470 KQSN400-N13/470  KQSN500-M18/460

KQSN500-N13/504   KQSN600-M27/485(I)

Common sealing models:

M74S2/110-G95A   M74S2/115-G95A M74S2/120-G95A  M74S2/125-G95A

M74S2/130-G95A   M74S2/135-G95A M74S2/140-G95A  M74S2/145-G95A

M74S2/150-G95A   M74S2/155-G95A M74S2/160-G95A  M74S2/170-G95A

M74S2/180-G95A   M74S2/190-G95A M74S2/200-G95A  M74S2/190-G95A

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 conditions) – The dynamic ring friction pair is made of alloy, while the static ring friction pair is made of graphite.
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 of the equipment should be kept clean during installation, and sealing components must be thoroughly cleaned. Ensure that the sealing 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, 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 rotate the shaft—there should be no sensation of unevenness or heaviness.
8. Before operating, the equipment must be fully charged with the medium to prevent dry friction, which could lead to seal failure.