Model |
QT-GLF B |
- |
Double mechanical seal for heavy-duty applications |
Seal Design |
Double Unbalanced Pusher Seal with Planar Faces |
- |
Pressurized or non-pressurized dual sealing configuration |
Primary Face Material |
Tungsten Carbide (WC) with Cobalt Bonding |
- |
Hardness: ≥ 1500 HV, Abrasion Resistance: ≤ 0.02 mm/1000 cycles |
Secondary Face Material |
Carbon Graphite Impregnated with PTFE |
- |
Self-lubricating, friction coefficient: 0.03 - 0.06 |
Housing Material |
Duplex Stainless Steel 2205 |
- |
Tensile Strength: ≥ 800 MPa, Pitting Resistance: PREN ≥ 34 |
Pressure Range |
0 - 4.0 (inner seal) / 0 - 1.5 (outer seal) |
MPa |
Maximum differential pressure: 2.5 MPa (between seals) |
Temperature Range |
-40°C to 260°C |
°C |
Thermal shock resistance: ≤ 120°C/s (cooling rate) |
Shaft Diameter Range |
40 mm - 110 mm |
mm |
Shaft axial movement tolerance: ±0.5 mm |
Maximum Rotational Speed |
4800 |
RPM |
Dynamic balance grade: G2.5 (ISO 1940) |
Leakage Rate (Each Seal) |
≤ 1.5 (liquid) / ≤ 5 bubbles/min (gas) |
ml/h / - |
Total leakage meets ISO 15747 standards |
Hardness (Housing) |
≥ 280 HB |
- |
Corrosion rate in seawater: ≤ 0.005 mm/year |
Media Compatibility |
Corrosive Liquids, High-Viscosity Oils, Steam |
- |
Suitable for petrochemical, pharmaceutical, and marine environments |
Installation Features |
Integral Flush Plan (API 622 Type 23) with Pressure Ports |
- |
Requires external barrier fluid for dual pressurized operation |
Compliance Standards |
API 682 (Clause 5), ISO 21049, BS EN 12756 |
- |
Certified for hazardous and high-integrity systems |