Technical Specifications
Packing Material: Braided PTFE / Flexible Graphite / Aramid
Stem Diameter: 0.5″–2.0″ (custom sizes available)
Pressure Rating: Up to 6000 PSI
Temperature Range: -200°C to +650°C (graphite); -50°C to +260°C (PTFE)
pH Compatibility: 0–14 (full chemical resistance)
Fugitive Emissions: <100 ppm VOC (EPA Method 21)
Live Loading: Belleville spring washers included
Set Count: Typically 5–7 rings per set
Packing Material: Braided PTFE / Flexible Graphite / Aramid
Stem Diameter: 0.5″–2.0″ (custom sizes available)
Pressure Rating: Up to 6000 PSI
Temperature Range: -200°C to +650°C (graphite); -50°C to +260°C (PTFE)
pH Compatibility: 0–14 (full chemical resistance)
Fugitive Emissions: <100 ppm VOC (EPA Method 21)
Live Loading: Belleville spring washers included
Set Count: Typically 5–7 rings per set
Functional Features
Low-friction design reduces actuator sizing requirements.
Self-relieving geometry prevents extrusion under high pressure.
Thermal expansion compensation maintains seal integrity.
Easy installation with pre-formed rings or spiral-wound options.
Compatible with linear and rotary valve stems.
Meets TA-Luft, ISO 15848, and SHELL SPE 77/312 standards.
Low-friction design reduces actuator sizing requirements.
Self-relieving geometry prevents extrusion under high pressure.
Thermal expansion compensation maintains seal integrity.
Easy installation with pre-formed rings or spiral-wound options.
Compatible with linear and rotary valve stems.
Meets TA-Luft, ISO 15848, and SHELL SPE 77/312 standards.
Application Scenarios
Refinery Hydrocarbon Service
Chemical Plant Toxic Fluid Handling
Power Plant High-Temperature Steam
Pulp Mill Black Liquor Lines
Offshore Platform Seawater Injection
Pharmaceutical Clean-in-Place Systems
Refinery Hydrocarbon Service
Chemical Plant Toxic Fluid Handling
Power Plant High-Temperature Steam
Pulp Mill Black Liquor Lines
Offshore Platform Seawater Injection
Pharmaceutical Clean-in-Place Systems
Performance Parameters
Friction Coefficient: <0.1 (PTFE-based)
Leakage Rate: <50 ppm detectable leakage
Cycle Life: >50,000 cycles without adjustment
Compression Set: <10% after thermal cycling
Extrusion Gap Tolerance: Up to 0.010″ radial clearance
Re-torque Interval: Extended due to live loading
Friction Coefficient: <0.1 (PTFE-based)
Leakage Rate: <50 ppm detectable leakage
Cycle Life: >50,000 cycles without adjustment
Compression Set: <10% after thermal cycling
Extrusion Gap Tolerance: Up to 0.010″ radial clearance
Re-torque Interval: Extended due to live loading
Structural Characteristics
Precision-cut rings with staggered joints
Spring-loaded follower plate for constant load
Lantern ring option for barrier fluid injection
Corrosion-resistant hardware (316SS or Inconel)
Color-coded materials for easy identification
Packaged in moisture-proof bag with installation instructions
Precision-cut rings with staggered joints
Spring-loaded follower plate for constant load
Lantern ring option for barrier fluid injection
Corrosion-resistant hardware (316SS or Inconel)
Color-coded materials for easy identification
Packaged in moisture-proof bag with installation instructions
Working Principle
Packing rings are compressed axially by the gland follower, causing radial expansion against the stem and stuffing box wall. This creates multiple sealing barriers that block fluid path. Live-loading springs maintain compression as packing wears or thermally cycles. In high-temp services, graphite oxidizes slightly to form a protective layer; in cryogenic service, PTFE remains flexible without hardening. Barrier fluid can be injected via lantern ring to further isolate process fluid.
Packing rings are compressed axially by the gland follower, causing radial expansion against the stem and stuffing box wall. This creates multiple sealing barriers that block fluid path. Live-loading springs maintain compression as packing wears or thermally cycles. In high-temp services, graphite oxidizes slightly to form a protective layer; in cryogenic service, PTFE remains flexible without hardening. Barrier fluid can be injected via lantern ring to further isolate process fluid.
Installation Requirements
Remove old packing completely and clean stuffing box.
Inspect stem for scratches or pitting; polish if necessary.
Remove old packing completely and clean stuffing box.
Inspect stem for scratches or pitting; polish if necessary.
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