DIN Sleeve Type Plug Valve with PTFE Soft Sealing Plug Valves

Specification

TIANYU DIN Sleeve-Type Soft-Seal Plug Valve: Precision Solution for Industrial Fluid Control

I. Product Overview

TIANYU DIN sleeve-type soft-seal plug valves are constructed from WCB carbon steel, 304/316 stainless steel, etc., designed to API 599, API 6D, and ASME B16.5 standards. The precise fit between PTFE sleeves and metal plugs ensures zero leakage control. Covering DN15-DN350 (1/2″-14″) with pressure classes Class 150-Class 900 (PN16-PN160), they operate at -29℃~180℃, widely used in corrosive and high-viscosity media pipelines for petroleum, chemical, pharmaceutical, and power industries.

II. Core Technical Parameters

Specifications & Operating Range
- Nominal Diameter: DN15/20/25/40/50/80/100/150/200/250/300/350 (1/2″-14″)
- Pressure Class: Class 150 (PN20), Class 300 (PN50), Class 600 (PN100), Class 900 (PN160)
- Temperature Range: -29℃~180℃ (PTFE seal), optional -196℃~200℃ (special fluoroelastomer configuration)
- Media Compatibility: Water, oils, natural gas, acid-base solutions (pH 4-10), particulate media (particle size ≤1mm)
Materials & Sealing System
- Body/Bonnet: ASTM A216 WCB carbon steel, ASTM A351 CF8/CF8M stainless steel
- Sleeve: PTFE (Shore hardness 55-65), wear coefficient ≤0.05
- Plug: ASTM A217 WC6 alloy forged steel, CF8M with STL alloy overlay (HRC58-62)
- Connection: Flanged (RF face, DIN EN 1092-1/ASME B16.5), buttweld (BW, ASME B16.25)
Mechanical Performance
- Opening/Closing Torque: DN100 Class 300 valve ≤150N·m (manual operation)
- Seal Leakage Rate: PTFE soft seal ≤1×10⁻⁹m³/s (API 598 Class VI)
- Service Life: 100,000 cycles without failure (GB/T 13932 standard)

Product Overview

III. Structural Design & Technical Features

360° Metal Lip Protection Structure
- The sleeve is surrounded by a metal lip retainer that automatically compresses the PTFE sealing surface using media pressure, with sealing specific pressure ≥20MPa for bidirectional bubble-tight sealing.
- The metal lip edge is hardened (HV≥300) to scrape off impurities from the sealing surface during plug rotation, reducing media deposition risk by 90%.
Cavity-Free Streamlined Flow Path
- The body features an equal-diameter straight-through design with resistance coefficient ≤0.9 (DN100), 20% lower pressure loss than traditional plug valves, suitable for media velocity ≤12m/s.
- No stagnant cavities inside prevent viscous media from solidifying, ideal for crystallizable media like asphalt and resin.
Bidirectional Flow Adaptability
- No need to distinguish media flow direction, reducing on-site installation errors, especially for complex pipeline renovations.
- Pressure-balanced design ensures opening/closing torque is unaffected by flow direction, with torque fluctuation ≤15% for Class 600 valves under 10MPa pressure difference.

IV. Manufacturing Processes & Quality Control

Precision Machining Flow
- Body Forging: WCB carbon steel formed by 3000-ton die forging with forging ratio ≥4:1, ultrasonic testing (UT) for internal defects (ASTM A388 compliant).
- PTFE Sleeve Molding: Cold-pressed sintering process, density ≥2.14g/cm³, dimensional tolerance ≤±0.03mm, surface roughness Ra≤0.8μm.
Surface Treatment Technology
- Carbon steel components hot-dip galvanized (coating thickness ≥85μm), passing 1000-hour salt spray test (ASTM B117); stainless steel components electropolished, chloride resistance improved by 40% (Cl⁻≤3000ppm).
Comprehensive Testing System
- Hydrostatic Test: 1.5x pressure (7.6MPa for Class 300) held 30min, 1.1x sealing pressure—zero leakage.
- Thermal Cycle Test: 1000 cycles between -29℃~180℃, PTFE sleeve without cracking or deformation.
- Certifications: CE-PED 2014/68/EU, ISO 9001:2015, provides Material Test Reports (MTR) and third-party inspection certificates.

Valve Details

V. Core Product Advantages

Complex Working Condition Adaptability
- Petroleum Refining: DN200 Class 600 valve in 300℃ sulfur-containing crude pipeline, NACE MR0175-certified material resists H₂S (≤1000ppm), 5-year leak-free operation.
- Pharmaceutical Industry: 316L stainless steel + FDA-certified PTFE sleeve in 70℃ medicinal liquid pipeline, inner wall roughness Ra≤0.4μm, GMP compliant.
Full-Life Cycle Cost Optimization
- Replaceable sleeve design shortens on-site maintenance to 1.5 hours/operation, reducing costs by 40% compared to metal hard-seal valves.
- Maintenance-free cycle reaches 80,000 operations or 5 years, saving $1200/year per DN100 valve, total cost of ownership (TCO) reduced by 35%.
Installation & Maintenance Convenience
- Supports manual, worm gear, pneumatic, electric actuation; DN150+ valves standard with gearbox interface, installation time 50% faster than welded valves.
- Provides visual maintenance guides; routine maintenance only requires quarterly sleeve wear inspection (allowable wear ≤0.2mm), no special tools needed.

Application

VI. Application Fields & Case Studies

Multinational Chemical Group: DN250 Class 300 valve controls 120℃, 2.5MPa vinyl acetate, PTFE sleeve resists swelling, 3-year leak-free operation.
LNG Terminal: DN80 Class 600 stainless steel valve in -162℃ LNG pipeline, cold-state seal test leakage ≤1×10⁻⁸m³/s, meets SIL 2 safety level.
Fertilizer Plant Ammonia Unit: DN100 Class 900 valve regulates 10MPa, 180℃ syngas, metal lip self-cleaning reduces ammonium salt crystallization blockage by 90%.

VII. Installation & Maintenance Guide

Installation Notes
- Flush pipeline with compressed air before installation; recommend upstream Y-strainer (precision ≥60 mesh).
- Tighten flange bolts diagonally in three passes, torque reference: ASME PCC-1 (Class 300 DN100 bolts ~220N·m).
Routine Maintenance
- Replenish special fluorosilicone grease via grease injection valve semiannually (injection volume = valve diameter mm × 0.15g), monthly for high-temperature (＞120℃) applications.
- For seal leakage, check sleeve wear first; minor wear can be compensated by adjusting gland bolts; replace PTFE sleeve assembly for severe wear.