The PTFE packing set manufactured by Taifno consists of a set of PTFE sealing rings, including a top adapter ring, V-shaped intermediate rings, and a bottom adapter ring, designed for installation in a stuffing box.
It is suitable for a temperature range of -180°C to +200°C, withstands pressures up to 500 bar, covers a pH range of 0–14, and supports linear speeds of up to 5 m/s.
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O-Ring Problem |
Why It Happens |
How Packing Set Fixes It |
|
Leaks on moving shafts |
O-rings are static seals — designed for fixed grooves, not shaft movement |
V-rings are dynamic — seal lips move with the shaft |
|
Cannot be adjusted |
Once installed, sealing force is fixed |
Re-tighten the gland nut as wear occurs — no disassembly |
|
Fails in chemicals |
Rubber swells, hardens, or degrades |
PTFE is chemically inert — pH 0-14 |
|
Replaced every few months |
Compression set — rubber takes permanent deformation |
PTFE has no compression set — lasts years |
|
Temperature limited |
Rubber hardens in cold, softens in heat |
-180°C to +200°C — cryogenic to sterilization |
1. Adjustable Sealing Force: O-rings are fixed — once installed, sealing force cannot be adjusted. PTFE packing sets are re-tightenable. As the packing wears over time, simply tighten the gland nut to restore sealing performance. No need to disassemble.
2. Dynamic Sealing for Moving Shafts: O-rings are static seals — they seal in one fixed groove and fail when the shaft moves. PTFE V-rings are designed specifically for reciprocating and slow rotary motion — seal lips move with the shaft, maintaining contact under pressure.
3. Pressure-Energized Sealing: The V-shaped geometry is engineered to be pressure-energized: as system pressure increases, it forces the sealing lips more firmly against the rod and housing, automatically enhancing sealing effectiveness.
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Property |
PTFE Packing Set |
|
Chemical Resistance |
pH 0-14 — virtually universal |
|
Temperature Range |
-180°C to +200°C |
|
Coefficient of Friction |
0.05-0.20 — lowest of any solid material |
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Self-Lubricating |
Yes — no external lubrication required |
|
FDA-compliant grades |
Available on request |
|
Compression Set |
None — PTFE does not set like rubber |
|
Feature |
PTFE V-Ring Packing |
O-Ring |
PTFE Composite Seal |
|
Sealing Type |
Dynamic — built for moving shafts |
Static — fixed groove only |
Dynamic — high speed |
|
Adjustable? |
✅ Yes — re-tightenable |
❌ No — fixed |
❌ No — fixed |
|
Temperature Range |
-180°C to +200°C |
Rubber limited |
-180°C to +200°C |
|
Pressure Range |
Up to 500 bar |
Moderate |
Up to 500 bar |
|
Chemical Resistance |
★★★★★ |
★★☆☆☆ |
★★★★★ |
|
Shaft Movement Tolerance |
High — handles misalignment |
Poor — fails on moving shafts |
Moderate — alignment sensitive |
|
Lifespan in Harsh Service |
Years |
Months |
Years |
|
Cost (Initial) |
$$$ |
$ |
$$$ |
|
Cost (Total Ownership) |
Lowest |
Highest |
Moderate |
|
Application |
Heavy-duty, low speed, harsh conditions |
Static sealing only |
High speed, low friction |
|
Industry |
Application |
|
Chemical Processing |
Valve stems, chemical pumps, reactors — acids, solvents, caustics |
|
Oil & Gas |
Control valves, gate valves, BOPs — NACE/API grades available |
|
Pharmaceutical |
Sterile processing, drug manufacturing — FDA/USP grades available |
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Food & Beverage |
Hygienic valves, filling equipment — FDA-compliant pure PTFE |
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Power Generation |
High-temperature steam systems, turbine seals |
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Semiconductor |
High-purity chemical distribution, cleanroom equipment |
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General Industrial |
Hydraulic presses, injection molding machines, compressors, mixers, agitators |
Control and isolation valves
Gate valves, ball valves, globe valves
Reciprocating pumps
Centrifugal pumps (slow rotary)
Hydraulic cylinders and actuators
Compressors
Mixers and agitators
Forging presses, injection molding machines
Challenge: A chemical plant handling aggressive acid at 150°C replaced O-rings on control valve stems every 2-3 months — causing costly downtime and safety concerns.
Solution: PTFE V-ring packing set with carbon-filled grade. Installed with recommended torque specifications.
Result: Zero leakage for 18 months. Packing re-tightened twice during scheduled maintenance. 80% reduction in maintenance costs and downtime.
Challenge: A slurry pump handling abrasive media wore out standard packing every 4-6 weeks, requiring frequent production interruptions.
Solution: Glass-filled PTFE packing set with anti-extrusion rings.
Result: Packing set lasted 8 months — 8x longer than previous solution. Maintenance intervals extended. Production uptime significantly improved.
Challenge: A natural gas processing facility needed to meet ISO 15848 fugitive emissions standards on critical control valves.
Solution: PTFE-based low emission packing set with proprietary lubrication package, tested to ISO 15848.
Result: Passed emissions compliance. Leakage rates well below allowable limits. Long-term performance verified through continuous monitoring.
Note: Actual case results vary by application conditions. Contact us for application-specific recommendations.
|
Parameter |
Value |
|
Temperature Range |
-180°C to +200°C (PTFE), up to +315°C (modified grades) |
|
Operating Pressure |
Up to 500 bar (50 MPa) — depends on design and back-up rings |
|
Maximum Speed |
< 5 m/s (reciprocating) |
|
pH Range |
0-14 (excluding molten alkali metals, fluorine compounds) |
|
Material Options |
Virgin PTFE, Carbon-filled, Glass-filled, MoS₂-filled |
|
Standards |
API 6A, NACE, NORSOK M-710 (available) |
|
Diameter Range |
Custom: 3mm to 1000mm+ |
|
Grade |
Best For |
Limit |
|
Virgin PTFE |
Clean chemicals, FDA applications, general service — lowest friction |
Lower wear resistance — not for abrasives |
|
Carbon-filled PTFE |
High speed, heat dissipation, low friction — where heat builds up |
Not for strong oxidizers |
|
Glass-filled PTFE |
Abrasive media, high load, wear resistance — where particles are present |
May score soft shafts — use hardened shaft or sleeve |
|
MoS₂-filled PTFE |
Sticky media, low torque, enhanced lubricity — where media sticks |
Not for oxidizing acids |
100% Virgin PTFE Material — no regrind, no recycled material. Consistent quality, batch after batch.
Full Traceability — Every batch traceable from raw material to finished product. Material certificates available on request.
Precision Molding — Each packing ring is precision molded or machined to tight tolerances.
Installation Guidance — Detailed installation instructions and torque specifications with every order.
ISO Quality System — Manufacturing processes follow international quality standards.
FDA Grades Available — FDA-compliant and USP Class VI grades for food and pharmaceutical applications.
A: It is a stack of PTFE rings, top adapter, V-shaped middle rings, bottom adapter, installed in a stuffing box.
When the gland nut is tightened, the V-rings expand radially against both the shaft and housing. System pressure further energizes the sealing lips, tighter seal as pressure rises. Self-energizing. Re-tightenable as wear occurs.
A: Switch when O-rings keep failing, on moving shafts, under pressure fluctuations, or in aggressive chemicals.
O-rings are static, they seal in fixed grooves. Packing sets are dynamic, adjustable, re-tightenable, and built for moving parts.
Cost comparison: O-rings cost less upfront. But if you replace them every 3 months, one packing set that lasts 3-5 years saves you a large amount of US dollars in parts, labor, and downtime.
A: Temperature: -180°C to +200°C (up to +315°C modified).
Pressure: up to 500 bar. Speed: < 5 m/s.
Most common mistake: over-tightening the gland. PTFE is soft, excessive compression causes cold flow, deforms rings, and creates leakage instead of sealing. Use a torque wrench. Tighten in increments.
Follow our installation guide, included with every order.
Address
No.1028, Qiersan Street, Andong Town, Cixi City, Zhejiang Province, China
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