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General Service Sealing

Single Mechanical Seal

Single Mechanical Seal ⚡ Helical Coil Spring

Technical Data

  • Faces: SSiC / Carbon / TC
  • Elastomers: Viton / Nitrile / EPDM / FFKM
  • Spring System: Single Spring / Wave Spring
  • Pressure Limit: Up to 20 bar
  • Temp. Limits: -40°C to 220°C
  • Shaft Speed: Up to 15 m/s

Simple & Economical Fluid Containment

Single mechanical seals consist of one primary sealing interface: a single rotating ring sliding against a stationary seat. These components are lapped to micro-inch flatness, allowing a thin lubricating film of the process fluid to separate the faces. By utilizing a single heavy-duty helical coil spring (or a robust wave spring), single seals maintain stable surface contact while remaining highly tolerant to misalignment and slurry clogging.

Micro Engineering designs and manufactures high-quality single mechanical seals that act as efficient, cost-effective leakage barriers. Ideal for standard industrial and utility operations, these seals are easy to rebuild, fit easily within restricted pump stuffing boxes, and operate without the need for complex external barrier fluid piping or support systems.

Preferred choice for clean water distribution, agricultural supply lines, wastewater extraction, and light chemical dosing loops.

Features & Benefits

Cost-effective simplicity coupled with robust helical spring execution.

Clogging Resistance

The single helical coil spring has a thick profile that resists the build-up of fibers, scale, or heavy solids, ensuring continuous face tracking in dirty fluids.

Cost-Effective & Simple

Extremely economical design that does not require auxiliary barrier reservoirs, cooling lines, or pressure management equipment to function.

Fewer Moving Parts

Having only one primary set of faces reduces potential leakage routes. Simple assembly allows for swift onsite maintenance and overhaul.

Bidirectional Rotation

When equipped with wave springs or bidirectional single coils, these seals operate securely irrespective of the pump motor shaft rotation direction.

Performance Boundaries & Setup

Comparing Single Mechanical Seals against Double Mechanical Seals.

Parameters Single Mechanical Seals Double Mechanical Seals
Sealing Boundary One dynamic interface (single primary face pair). Two dynamic interfaces (inboard and outboard face pairs).
Process Leakage Control Allows minor vapor escape (standard face lubrication film). Zero process leakage (blocked by barrier fluid system).
Auxiliary Support None required (operates directly in process fluid). Requires API Plan reservoir, piping, and pressure dials.
Clogging & Slurry Tolerance High (thick helical spring design sheds build-up). Low (faces can clog unless clean barrier flush runs).
Installation Footprint Compact; fits standard stuffing boxes easily. Requires larger axial and radial space on shaft.
Capital & Maintenance Cost Very economical purchase price and simple rebuilds. High initial investment; dual face spares required.

Typical Applications

Broad sealing capability across standard industrial utility pumping networks.

01

Centrifugal Utility Pumps

Installed as primary shaft barriers on clean water circulation systems and standard utility pumps.

02

Wastewater & Effluent Lines

Robust single helical springs manage suspended grit, sludge, and fibers without clogging the mechanism.

03

Agricultural & Irrigation Pumps

Selected for irrigation booster setups due to its minimal cost, simplicity, and low maintenance requirement.

04

Non-Hazardous Chemical Transfer

Effectively seals light solvents, cooling tower water loops, mild acids, and detergent tanks.

Why Choose Our Single Seals?

Micro Engineering manufactures reliable, simple-to-maintain single mechanical seals that balance economic pricing with reliable service.

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Helium Lapped Flatness

Dynamic faces undergo optical flat testing under monochromatic helium light, maintaining flatness to 1-2 light bands.

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Optimized Spring Tempers

Springs are coiled from heavy SS316 or Hastelloy-C, preventing fatigue failures and chemical erosion.

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Pressure Testing Standards

Each seal undergoes static leak-tests on precision fixtures to ensure total reliability prior to dispatch.

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Premium Materials Only

We source only high-purity carbon, sintered silicon carbide, and certified viton elastomers to avoid premature breakdown.