PTFE‑Lined Plug Valve With Dual‑Seal Stem Protection is a heavy‑duty industrial plug‑valve solution engineered for long‑term, low‑maintenance operation in corrosive chemical, slurry and cyclic‑heat process systems. Equipped with full‑coverage PTFE liner sealing and independent dual‑stem sealing protection, this valve eliminates unplanned shutdowns, reduces repair costs and delivers extended service life compared with ball valves or gate valves.
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PTFE‑Lined Lubricated Plug Valve | Double Sealed Industrial Plug Valve
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Size Range NPS 1/2" to 24" (DN15 to DN600), larger sizes up to DN600 available upon request |
Body Material Options Carbon Steel (WCB), Stainless Steel (CF8, CF8M, CF3, CF3M), Duplex Stainless Steel (4A/5A), Alloy 20, Hastelloy®, Monel®, Inconel®, Titanium |
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Temperature Range -50°F to +650°F (-46°C to +343°C), extended ranges available with special alloys |
Stem / Shaft Material ASTM A479 Gr. 316, optional 17-4PH, Duplex SS, low-friction coating available |
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Maximum Allowable Working Pressure ASME Class 150 & 300, PN16, PN25, PN40 |
Seats & Seals RPTFE, TFM1600, Tek-Fil®, PEEK, UHMWPE, Metal-to-Metal |
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Plug Material ASTM A351 Gr. CF8M, optional hardfaced/coated (ENP, Stellite®, Cr-Carbide) |
Shutoff Rating Class VI, bubble-tight shutoff optional |
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Operation Method Lever, Gear Operator, Pneumatic Actuator, Electric Actuator, ISO 5211 platform |
Body Style & Ports 2-Way (Straight), 3-Way (L- or T-pattern), Full Bore or Reduced Bore |
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Design Standards ASME B16.34, API 608, MSS-SP-72 |
End Connection Standards Flanged: ASME B16.5 (RF/RTJ), DIN EN1092 PN16/25/40 |
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Testing & Inspection API 598, ISO 5208 Pressure & Leakage Test Optional NDT: Radiography, Ultrasonic, Magnetic Particle |
Face-to-Face Dimensions ASME B16.10, ISO 5752
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Special Design Features Bi-directional sealing, low operating torque, multiple seat options, full-bore flow, modular actuation, corrosion & wear resistance, long service life |
Applications Oil & Gas pipelines, Petrochemical processing, Fuel handling systems, Municipal water & wastewater, Chemical plants, Power generation |
Technical Specifications
- Size Range: 1/2"‑24"
- Liner Material: Virgin PTFE / Graphite‑filled PTFE
- Body: Carbon‑steel, Stainless‑steel and alloy material options
- Operation: Manual lever, gear‑operated, pneumatic or electric‑automated actuation
- External‑leakage‑control levels can be custom‑specified upon request
Core Design Principle
Large‑perimeter PTFE (Polytetrafluoroethylene) liner forms the primary sealing
surface, delivering far superior sealing performance than standard ball or gate valves.
The low‑friction property of the PTFE liner provides built‑in self‑lubrication.
The plug can be operated smoothly even after staying fully open or closed for
extended periods.
Two‑independent sealing systems are adopted to provide double protection
against external leakage. The secondary PTFE ring creates an extra‑level
stem‑seal safeguard, ideal for harsh thermal‑cycling working conditions.
Dynamic spring washers maintain constant, stable compression force on packing
seals to compensate for thermal expansion‑contraction changes during repeated
heat‑cycle service. Optional injection‑monitoring ports are available on the
top‑primary outer‑seal.
Advantages：
- Reduce Unplanned Downtime: Replacing ball valves and gate valves with GEKO lined plug‑valves significantly cuts production‑loss and maintenance expenses.
- Simple Field Adjustment: Long‑term sealing performance can be quickly restored by adjusting the top‑mounted bolting, without full valve disassembly.
- Dual‑Stem Leakage Protection: Double independent sealing layers effectively prevent process‑media escape to atmosphere.
- Low‑Friction Self‑Lubricated Liner: Smooth plug rotation after long idle‑time,
no‑sticking risk for infrequently operated loops.
- Cost‑Efficient Long‑Life Performance: Balanced purchase cost and extended
service cycles, delivering outstanding long‑term economic benefits.
Available Variants & Options
- Standard PTFE‑lined on‑off plug valve
- Severe‑service thermal‑cycling plug‑valve with patented retractable sealing gasket
- Gravity‑sampling plug‑valve for bulk‑solid and liquid sampling systems
- Class 600 high‑pressure lined plug‑valve, multi‑port configurations on request
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GEKO cage‑sleeved plug valve features PTFE liner protection, metal‑to‑metal throttling design, ideal for slurry, brine, phosphoric acid and other corrosive high‑velocity fluid services. Sizes 1‑16 inch, carbon steel / stainless‑steel body available.
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PTFE‑Lined Plug Valve With Dual‑Seal Stem Protection is a heavy‑duty industrial plug‑valve solution engineered for long‑term, low‑maintenance operation in corrosive chemical, slurry and cyclic‑heat process systems. Equipped with full‑coverage PTFE liner sealing and independent dual‑stem sealing protection, this valve eliminates unplanned shutdowns, reduces repair costs and delivers extended service life compared with ball valves or gate valves.
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