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Kevlar pump packing is a sealing material. It's made from braided DuPont Kevlar (Aramid 1414) fibers. They treat it with PTFE emulsion and lubricants. This composite packing mixes Kevlar's strength—5 to 6 times stronger than steel—with PTFE’s chemical resistance. It's great for media with particles and tough pump tasks in high temperatures and pressures. Low cold-flow and high recovery cut down on shaft sleeve wear. This makes it a better choice for the environment compared to asbestos packings. Common trade names and aliases include Kevlar packing and aramid packing. For application matching or third-party test reports, reach out to our technical team. They provide one-on-one support for sample trials.
Oil & mining: mud pump seals for tough drilling slurries. They resist high pressure and sand-laden fluids. Field life exceeds 800 hours in Middle Eastern oilfield applications.
Chemical processing: centrifugal pump seals for corrosive acids/bases within pH 2–12.
Water & wastewater: Our sewage lift pump packings last much longer than standard packings.
Pulp & Paper: Use pulp transfer pumps in areas with high fiber abrasion. This helps to reduce maintenance downtime.
Power generation: feedwater and turbine auxiliary pumps work well at high temperatures. They are ideal when low leakage is essential.
Install packings as individual rings with staggered 90° joints; avoid coincident joints.
Clean the stuffing box and take out the old sealant. The shaft sleeve surface roughness should be ≤1.6 μm.
Initial gland compression: 15–20%. Tighten gland bolts evenly in three stages. Use a torque wrench to prevent over-compression and shaft wear.
For particulate media, provide a flush system with a flush pressure of 0.5–1.0 bar above seal chamber pressure.
Check for leaks every 2 hours during the initial run. After that, inspect weekly.
Q: Can we use Kevlar pump packing with particulate high-temperature media?
A: Yes. Kevlar fibers offer excellent abrasion resistance; PTFE impregnation enhances chemical resistance. Use within −100°C to 280°C limits.
Q: What should I do if leakage exceeds the limits after installation?
A: Verify gland bolt torque and retighten to specified values. If you find wear on the shaft sleeve, fix or replace it before putting the packing back in. Confirm media pH remains within 2–12.
Q: How does Kevlar packing compare to pure PTFE packing?
A: Kevlar-based packing is over five times stronger than pure PTFE. It also has better anti-extrusion performance and improved dimensional stability under pressure. This makes it a great choice for dynamic seals.
Q: Is Kevlar pump packing suitable at −80 °C?
A: Yes. The packing maintains elasticity down to −100 °C without embrittlement.
Q: How to maximize service life?
A: Keep shaft runout at or below 0.1 mm. Maintain a flush system. Avoid dry running. Periodically use compatible silicone-based lubricants as suggested.
Conclusion: Kevlar pump packing offers a smart choice for tough sealing tasks. It works well in high temperatures and pressures. Plus, it resists abrasion and corrosion effectively. It’s a top choice for high performance. It’s also better for the environment, especially when asbestos or low-quality packings aren’t suitable.
Recommendations
Match the packing variant to these three key parameters:
Media pH (choose impregnation chemistry)
Temperature/Pressure (choose braid density)
Shaft Speed (choose braid construction)
Control installation: Use a calibrated torque wrench. The recommended torque is 25–30 N·m. Stagger joints and keep expansion clearance.
For custom selection tables, installation videos, or local supplier referrals, request free samples and application verification services.
Inspect high-pressure seals every 500 hours.
Replace them if thickness loss is over 20% or if leakage is too high.
Implement lifecycle management:
Kevlar pump packing — also marketed as Kevlar packing and aramid packing.
