Sleeve Type Non-Lubricated Plug Valve NPS 1/2″ Class 600 RF | CF8
NPS 1/2″ (DN15) Class 600 (PN84) Raised Face Flanged (RF) Sleeve Type Non-Lubricated Plug Valve (CF8 Body, Wrench / Lever). Manufactured to API 599 / ASME B16.34 and ASME B16.5 RF Flanged. Engineered with a 360° fully-retained Virgin PTFE / PFA sleeve, zero-cavity dead-space architecture, in-line top-adjusting seal gland, and fire-safe secondary metal seating for zero-leakage, contamination-free isolation in corrosive chemical, polymer, and slurry applications.
Description
The NPS 1/2″ (DN15) Class 600 (PN84) Raised Face Flanged (RF) Sleeve Type Non-Lubricated Plug Valve (CF8) is an engineered high-integrity quarter-turn isolation valve manufactured by XIAMEN GUTE VALVE MANUFACTURING COMPANY. Designed in rigorous compliance with API 599 / ASME B16.34 and ASME B16.34, it incorporates a fully retained, high-memory 360° PTFE/PFA sleeve that envelops the precision-ground tapered plug. By completely eliminating internal body cavities, grease injection requirements, and metal-to-metal sliding contact, it guarantees bidirectional zero-leakage shutoff, self-lubricating operation, and uncompromised process purity across severe corrosive chemicals, toxic fluids, crystallizing slurries, and industrial processing pipelines.
Engineering Configuration & Dimensional Specifications
NPS 1/2″ (DN15) | Class 600 (PN84) | CF8 Body | Raised Face Flanged (RF) | Wrench / Lever | API 599 / ASME B16.34
- Face-to-Face Dimension (L): 165 mm (API 599 / ASME B16.34 / ASME B16.5 RF Flanged)
- Centerline-to-Top Stem Height (H): 170 mm
- Operating Breakaway Torque: ~55 N·m (Calculated at full differential shutoff pressure ΔP)
- Bare-Stem Assembly Net Weight: ~10 kg
- Sealing Architecture: 360° fully confined Virgin PTFE / PFA sleeve with zero cavity entrapment
- Adjustment Mechanism: External in-line top-entry three-bolt plug adjustment gland
Core Structural Engineering: 360° Sleeve Retention & Cavity-Free Flow Path
The sleeve-type plug valve represents the ultimate solution for media purity and anti-clogging isolation, outperforming conventional ball and gate valves in sticky, crystallizing, or polymerizing services.
- Zero Body Dead-Space: The resilient sleeve fills 100% of the internal cavity volume surrounding the plug. Fluid cannot accumulate, stagnate, or polymerize around the closure element, eliminating media contamination and cavity overpressure hazards.
- Mechanical Sleeve Anchoring: Precision body retention ribs and high-pressure locking lips securely anchor the sleeve in all directions, preventing cold-flow deformation and sleeve rotation under high-cycle operation.
- Self-Cleaning Wiping Action: During quarter-turn operation, the precision metal plug edge exerts a continuous 360° wiping action against the PTFE sleeve, actively scouring off particulate scale, slurries, and polymer buildup.
Rigorous Quality Assurance & API 598 Testing Protocols
- 1. Positive Material Identification (PMI): 100% Spectro chemical verification on all pressure-retaining casting and forging heats with certified EN 10204 3.1 Mill Test Reports (MTR).
- 2. Hydrostatic Shell Testing: 100% individual pressure boundary verification at 1.5x Maximum Allowable Working Pressure (MAWP) per API 598 / EN 12266-1 with zero allowable leakage.
- 3. Bidirectional Seat Closure Verification: Hydrostatic (1.1x MAWP) and low-pressure air seat test (6 bar) verifying API 598 / API 6D Rate A zero-bubble shutoff in both flow directions.
- 4. Torque & Cycling Verification: Operating breakaway torque tested and recorded to guarantee pneumatic and electric actuator sizing margins.
- 5. Fire-Safe Certified Architecture: Available with secondary metal-to-metal fire-safe lips qualified per API 607 (7th Edition) and ISO 10497.
Frequently Asked Technical Questions
A: In conventional ball valves and gate valves, fluid enters the body cavity surrounding the closure member, where stagnant media can crystallize, polymerize, or cause cross-contamination. In Gute sleeve type plug valves, the 360° fully retained PTFE sleeve completely fills the body chamber. There is zero dead volume between the plug and body, completely preventing fluid entrapment and making it the premier choice for crystallizing salts, pigment slurries, and ultra-pure chemical processes.
A: The CF8 stainless steel body and precision-machined plug are diamond-lapped to an ultra-smooth Ra <= 0.2 µm finish. Because the plug rotates exclusively against the self-lubricating PTFE sleeve, metal-to-metal contact and galling are 100% eliminated. The stainless metallurgy provides permanent passivity against organic acids, chlor-alkali, and corrosive chemical streams without metallic ion leaching.
A: Primary stem sealing is achieved by the upper reverse lip of the PTFE sleeve. Secondary stem containment features independent flexible graphite rings live-loaded with Inconel Belleville spring washers. This dual-barrier stem seal is tested and qualified to ISO 15848-1 Class AH and German TA-Luft (VDI 2440), guaranteeing stem leakage rates below 100 ppmv and ensuring worker safety in toxic chemical processing.
Need Project-Specific Sleeve Type Plug Valve Sizing or Actuation Packages?
Contact Gute Valve technical engineering team for certified dimensional drawings, Cv flow coefficient data, automated pneumatic/electric actuator sizing, or chemical resistance charts.
Additional information
| Material | |
|---|---|
| Pressure | |
| Valve Size | |
| Connection | |
| Design Standard | ASME Standard |
| Body Material | CF8 |
| Size | NPS 1/2" |
| Pressure Class | Class 600 |
| Connection End | RF |
| Operation | Lever / Gear / Actuator |
| Design Structure | 360° PTFE Sleeve / Zero Dead-Cavity |
| Manufacturer | XIAMEN GUTE VALVE MANUFACTURING COMPANY |
| Plug Material | 304 |
| Sleeve Material | PTFE (Customizable to PFA) |
