4" 150LB Hypalon Fully Lined Diaphragm Valve
4" 150LB Hypalon Fully Lined Diaphragm Valve - Image 2
4" 150LB Hypalon Fully Lined Diaphragm Valve - Image 3
4" 150LB Hypalon Fully Lined Diaphragm Valve - Image 4

4″ 150LB Hypalon Fully Lined Diaphragm Valve

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Description

Straight-Through Diaphragm Valve Technical Datasheet

(Non-Weir, Reduced-Bore Design)
Compliance: BS5156 ∙ Materials: Ductile Iron + Full EPDM Lining

Component Material & Specification Key Properties
1. Valve Body Ductile Iron (EN-GJS-400-18/GGG40)
• Full Internal Lining: EPDM (3 mm min. thickness)		 • Pressure Rating: PN10/PN16
• Lining Adhesion: ≥ 5 MPa (ISO 4624)
• Corrosion Protection: Full EPDM barrier
2. Disc Ductile Iron (GGG40)
• EPDM-Encapsulated		 • Reduced-Bore Design: 85–90% of pipe ID
• Abrasion-Resistant Surface
3. Stem AISI 316L Stainless Steel
• Mechanically Polished (Ra ≤ 1.6 μm)		 • SSC-Resistant (NACE MR0175)
• Hardness: 140–180 HB
4. Diaphragm Hypalon
• Polyester Fabric Core		 • Temp Range: -20°C to +130°C
• Cycle Life: ≥ 50,000 cycles
5. Bonnet Ductile Iron + Full EPDM Lining • Bolted Design (EPDM-Coated Bolts)
6. Seals EPDM O-Rings/Gaskets • Bubble-Tight Shutoff (ISO 5208 Rate A)

⚙️ Critical Technical Data

Parameter Specification
Flow Path Design Straight-Through (Non-Weir) ∙ Bore: 85–90% of nominal pipe ID
Size Range DN50 to DN200 (2″ to 8″)
End Connections • Flanged (EN 1092-1 Type A) ∙ ANSI Class 150
• Optional: Lug/Wafer
Flow Coefficient DN100 (4″): Cv ≈ 120 (vs. 180 for full-bore)
Pressure Drop ΔP ≈ 0.3–0.8 bar (water, 2 m/s flow)
Actuation Manual Handwheel ∙ Pneumatic (Spring-Return) ∙ Electric (On/Off)
Certifications PED 2014/68/EU (Cat. II) ∙ ISO 9001 ∙ EN 10204 3.1

🔍 Straight-Through vs. Full Bore: Key Differences

Feature Straight-Through Valve Full-Bore Valve
Bore Diameter 85–95% of pipe ID 100% of pipe ID
Flow Efficiency Moderate (Cv ≈ 65% of full-bore) Maximum (No restriction)
Slurry Handling Good (Less clogging than weir-type) Excellent (Zero clogging risk)
Mechanical Strength Higher (Thicker walls due to reduced bore) Lower (Thinner walls to match pipe ID)
Cost Lower (Less material) Higher

✅ Design Advantages of Straight-Through Configuration

  1. Optimized for Slurries & Viscous Fluids

    • Smooth, obstruction-free flow path prevents particle buildup (e.g., wastewater sludge, pulp).

  2. Robust Pressure Containment

    • Thicker ductile iron walls (enabled by reduced bore) withstand surge pressures up to 1.5×PN.

  3. Simplified Maintenance

    • Top-entry diaphragm replacement (no pipe disassembly).

  4. 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).

  • Temperature: 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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