Beschrijving
Straight-Through Diaphragm Valve Technical Datasheet
(Non-Weir, Reduced-Bore Design)
Compliance: BS5156 ∙ Materialen: Ductile Iron + Full EPDM Lining
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Onderdeel
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Material & Specification
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Key Properties
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1. Valve Body
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Ductile Iron (EN-GJS-400-18/GGG40) • Full Internal Lining: EPDM (3 mm min. thickness)
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• Pressure Rating: PN10/PN16 • Lining Adhesion: ≥ 5 MPa (ISO 4624) • Corrosion Protection: Full EPDM barrier
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2. Disc
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Ductile Iron (GGG40) • EPDM-Encapsulated
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• Reduced-Bore Design: 85–90% of pipe ID • Abrasion-Resistant Surface
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3. Stem
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AISI 316L Stainless Steel • Mechanically Polished (Ra ≤ 1.6 μm)
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• SSC-Resistant (NACE MR0175) • Hardness: 140–180 HB
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4. Diaphragm
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Hypalon • Polyester Fabric Core
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• Temp Range: -20°C to +130°C • Cycle Life: ≥ 50,000 cycles
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5. Bonnet
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Ductile Iron + Full EPDM Lining
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• Bolted Design (EPDM-Coated Bolts)
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6. Seals
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EPDM O-Rings/Gaskets
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• Bubble-Tight Shutoff (ISO 5208 Rate A)
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Critical Technical Data
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Parameter
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Specificatie
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Flow Path Design
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Straight-Through (Non-Weir) ∙ Bore: 85–90% of nominal pipe ID
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Size Range
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DN50 to DN200 (2″ to 8″)
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End Connections
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• Flanged (EN 1092-1 Type A) ∙ ANSI Class 150 • Optional: Lug/Wafer
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Flow Coefficient
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DN100 (4″): Cv ≈ 120 (vs. 180 for full-bore)
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Pressure Drop
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ΔP ≈ 0.3–0.8 bar (water, 2 m/s flow)
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Aandrijving
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Manual Handwheel ∙ Pneumatic (Spring-Return) ∙ Electric (On/Off)
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Certifications
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PED 2014/68/EU (Cat. II) ∙ ISO 9001 ∙ EN 10204 3.1
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Straight-Through vs. Full Bore: Key Differences
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Feature
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Straight-Through Valve
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Full-Bore Valve
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Bore Diameter
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85–95% of pipe ID
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100% of pipe ID
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Flow Efficiency
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Moderate (Cv ≈ 65% of full-bore)
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Maximum (No restriction)
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Slurry Handling
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Good (Less clogging than weir-type)
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Excellent (Zero clogging risk)
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Mechanical Strength
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Higher (Thicker walls due to reduced bore)
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Lower (Thinner walls to match pipe ID)
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Cost
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Lower (Less material)
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Higher
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Design Advantages of Straight-Through Configuration
- Optimized for Slurries & Viscous Fluids
- Smooth, obstruction-free flow path prevents particle buildup (e.g., wastewater sludge, pulp).
- Robust Pressure Containment
- Thicker ductile iron walls (enabled by reduced bore) withstand surge pressures up to 1.5×PN.
- Simplified Maintenance
- Top-entry diaphragm replacement (no pipe disassembly).
- Cost-Effective Corrosion Protection
- Full EPDM lining isolates ductile iron from corrosive media (pH 3–12).
Limitations & Design Notes
- Not Pigable: Reduced bore prevents pipeline pigging.
- Chemical Limits: EPDM incompatible with oils, aromatics, concentrated acids (>20% H₂SO₄).
- Temperatuur: Max. 130°C (EPDM) – derate pressure above 80°C.
- Actuator Sizing: Higher torque required vs. weir-type due to larger diaphragm area.
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