Class P unbalanced seals P21, P22
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P21 Mechanical seal
Class P unbalanced seals
P21, P22
Features
- Rotating multi-spring pusher seals
- Unbalanced
- Compact in lenght
- Available as O-Ring or wedge variants
- Hard/hard seal face combination available
- Uniform seal face loading
- Exotic compatible metallurgy for hardware
- Independent of direction of rotation
- Available as single, dual and tandem arrangements
Advantages
- Suitable for a wide range of abrasive and corrosive fluids
- Over 35 years of running reference in the field
- Narrow cross-section allows the seal fitment in narrow stuffing boxes
- Lower inventory since all parts except seal ring composite are interchangeable with Class P balanced seals (P23, P24).
Operating range
Shaft diameter: d = 25 … 100 mm (1" ... 3.94")
Pressure: p = vacuum to 16 bar (232 PSI)
Temperature:
t = -75 °C ... +260 °C (-103 °F ... +500 °F)
Sliding velocity: vg = 25 m/s (82 ft/s)
Axial movement: ±0.5 mm
(Consult EB for applications outside above limits).
Materials
Seal ring: Carbon graphite resin impregnated,
Carbon graphite antimony impregnated,
Tungsten carbide, Silicon carbide
Mating ring: Silicon carbide, Tungsten carbide
Secondary seals: FKM, NBR, FFKM, PTFE
Springs: Hastelloy® C-4
Metal parts: SS 316, other materials on request.
Recommended applications
- Process industry
- Oil and gas industry
- Refining technology
- Petrochemical industry
- Chemical industry
- Pharmaceutical industry
- Power plant technology
- Water and waste water technology
- Building services industry
- Food and beverage industry
- Sugar industry
- Horizontal and vertical pumps, agitators, mixers
Recommended piping plans
API Plans 01, 02, 03, 11, 12, 13, 14, 21, 22, 23, 31, 32, 41, 52, 53A, 53B, 53C, 54, 55, 61, 62, 65A, 65B, 66
Product variants
P22 mechanical seal with wedge
