3″-150LB EPDM Fully Lined Diaphragm Valve
Description
Technical Data Sheet – 3″ Class 150 EPDM Fully Lined Straight-Through Diaphragm Valve
1. Product Overview
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Product Name: EPDM Fully Lined Straight-Through Diaphragm Valve
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Valve Type: Diaphragm Valve (Straight-Through / Full Bore Design)
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Design Standard: MSS SP-88 / BS 5156 / ISO 5xxx Series
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Size: 3 inches (DN80)
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Pressure Class: Class 150 (PN10/PN16 compatible)
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Body Material: Ductile Iron / Cast Iron (Lined)
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Lining Material: EPDM (Ethylene Propylene Diene Monomer) – Fully Lined
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Diaphragm Material: EPDM (with fabric reinforcement)
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Operation: Handwheel (Manual) / Gear / Actuator ready optional
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Connection Type: Flanged Ends (ANSI B16.1 for Cast Iron / B16.42 for Ductile Iron)
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Bonnet Type: Maintenance-free sealed bonnet (or open bonnet optional)
2. Applicable Standards & Specifications
| Item | Standard |
|---|---|
| Design and Manufacture | MSS SP-88, BS 5156, ISO 5xxx Series |
| Face-to-Face Dimensions | MSS SP-88 / ISO 5752 (Basic Series 1) – Longer than weir type for straight-through design |
| Flange Dimensions | ASME B16.1 (Cast Iron) / ASME B16.42 (Ductile Iron) |
| Pressure-Temperature Rating | MSS SP-88 / Manufacturer’s rating for lined valves |
| Inspection and Testing | MSS SP-88 / ISO 5208 / EN 12266-1 |
| Marking | MSS SP-25 |
3. Technical Parameters
| Parameter | Specification |
|---|---|
| Nominal Size | 3 inch (DN80) |
| Pressure Class | Class 150 (Maximum working pressure dependent on temperature and lining) |
| Max Working Pressure | 10 bar (145 psi) at ambient temperature (straight-through design typically has lower pressure rating than weir type) |
| Temperature Range | -40°C to +120°C (-40°F to +248°F) – EPDM lined body and diaphragm |
| Connection Type | Flanged, Raised Face (ANSI B16.1 Class 125 / B16.42 Class 150) |
| Flange Drilling | ANSI B16.1 Class 125 pattern (for Cast Iron body) or B16.42 Class 150 |
| Operation | Handwheel with visual position indicator |
| Bonnet Type | Sealed bonnet (weather-proof) or open bonnet (optional) |
| Flow Direction | Bi-directional |
| Leakage Rate | MSS SP-88 / ISO 5208 Rate A (bubble tight) |
| Shell Test Pressure | 1.5 × rated pressure (15 bar / 217 psi) |
| Seat Test Pressure | 1.1 × rated pressure (11 bar / 160 psi) |
4. Lining & Diaphragm Specifications
4.1 EPDM Lining
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Material: EPDM (Ethylene Propylene Diene Monomer)
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Lining Thickness: 3.0 mm – 5.0 mm minimum (per MSS SP-88 requirements)
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Lining Coverage: Fully lined body including flange faces and wetted surfaces
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Properties:
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Excellent resistance to hot water, steam, dilute acids, alkalis, and many chemicals
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Good resistance to ozone, weathering, and aging
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Suitable for food and pharmaceutical applications (FDA compliant grades available)
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Not suitable for oils, hydrocarbons, or solvents
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4.2 EPDM Diaphragm
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Material: EPDM with fabric reinforcement (polyester or nylon)
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Construction: Multiple-ply reinforcement for extended cycle life
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Design: Engineered to seal across full bore opening
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Properties:
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Flexible at low temperatures
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Resistant to abrasion and flex fatigue
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Complete isolation of working parts from process fluid
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5. Material of Parts
| Part Name | Material | Standard / Notes |
|---|---|---|
| Body | ASTM A126 Class B Cast Iron / ASTM A395 Ductile Iron | Fully EPDM lined |
| Bonnet | ASTM A126 Cast Iron / ASTM A536 Ductile Iron | Unlined, external |
| Diaphragm | EPDM + Fabric Reinforcement | Replaceable |
| Lining | EPDM (vulcanized bonded) | Full body and flange faces |
| Compressor | Ductile Iron / Stainless Steel | Coated for corrosion resistance, larger size for straight-through design |
| Stem | Stainless Steel (AISI 416 / 304) | Rolled threads for strength |
| Handwheel | ASTM A197 Cast Iron / Ductile Iron | With position indicator |
| Handwheel Nut | Steel / Stainless Steel | — |
| Bonnet Bolts | Carbon Steel / Stainless Steel | Zinc plated or SS |
| Indicator | Plastic / Stainless Steel | Shows open/closed position |
| Yoke Bush | Nylon / Bronze | Low friction |
6. Dimensional Data (3″ Class 150 – Flanged, Straight-Through)
| Dimension Description | Value (mm / inch) |
|---|---|
| Face-to-Face Length (L) | 280 mm (11.02″) – Typical for straight-through design (longer than weir type) |
| Flange Diameter (D) | 190 mm (7.48″) – per ASME B16.1 Class 125 |
| Bolt Circle Diameter (K) | 152.4 mm (6.00″) |
| Number of Bolt Holes | 4 |
| Bolt Hole Diameter | 19 mm (0.75″) |
| Flange Thickness (C) | 24 mm (0.94″) – minimum |
| Raised Face Diameter | 127 mm (5.00″) |
| Raised Face Height | 1.6 mm (1/16″) |
| Overall Height (H1) – Closed | ~160 mm (6.30″) |
| Overall Height (H2) – Open | ~240 mm (9.45″) |
| Handwheel Diameter | 200 mm (7.87″) |
| Approx. Weight | 14.5 kg (32 lbs) |
Note: Final dimensions to be confirmed with manufacturer’s drawing. Straight-through diaphragm valves typically have longer face-to-face dimensions than weir-type valves.
7. Design Features
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Straight-Through / Full Bore Design:
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No weir obstruction in flow path
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Minimum pressure drop across valve
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Self-draining capability in horizontal pipelines
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Suitable for viscous fluids, slurries, and fibrous materials
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Easier cleaning for sanitary applications
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Fully Lined Construction: All wetted surfaces (body and flange faces) are completely covered with EPDM, providing excellent corrosion resistance without metal contact with process fluid.
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Isolation of Working Parts: Stem, compressor, and bonnet mechanism are completely isolated from process fluid by the diaphragm, eliminating packing leaks and stem seals.
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Maintenance-Free Bonnet: Sealed bonnet design protects stem and compressor from atmospheric corrosion (optional open bonnet for easy maintenance).
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Visual Position Indicator: Handwheel or bonnet-mounted indicator shows valve position at a glance.
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Bi-Directional Flow: Can be installed in any orientation with equal sealing performance.
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Replaceable Diaphragm: Diaphragm can be replaced without removing valve from pipeline (bonnet removal only).
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Improved Flow Characteristics: Straight-through design offers Cv values approximately 30-50% higher than equivalent weir-type valves.
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Quarter-Turn Option: Available with gear or actuator mounting (ISO 5211 interface optional).
8. Flow Characteristics Comparison
| Parameter | Straight-Through Design | Weir-Type Design |
|---|---|---|
| Flow Path | Unobstructed full bore | Restricted by weir |
| Cv Value (3″) | ~180-220 | ~120-150 |
| Pressure Drop | Very low | Moderate |
| Solids Handling | Excellent (passes large particles) | Limited (weir traps solids) |
| Self-Draining | Yes (horizontal lines) | No (weir traps fluid) |
| Max Pressure Rating | Lower (typically 10 bar) | Higher (up to 16 bar) |
9. Inspection & Testing
| Test Type | Criteria |
|---|---|
| Shell Test | Hydrostatic at 1.5 × rated pressure (15 bar / 217 psi) per MSS SP-88 |
| Seat Test | Hydrostatic or pneumatic at 1.1 × rated pressure (11 bar / 160 psi) |
| Low Pressure Seat Test | Pneumatic at 3.5 bar (50 psi) for bubble-tight verification |
| Lining Integrity Test | High voltage spark test (5kV to 15kV) to verify pinhole-free lining |
| Diaphragm Flex Test | Cycle testing per manufacturer’s quality plan |
| Material Certification | EN 10204 3.1 available on request |
| FDA Compliance | Available for food/pharma applications (upon request) |
10. Applications
| Industry | Typical Services | Advantage of Straight-Through Design |
|---|---|---|
| Water Treatment | Sludge, slurry, lime, viscous fluids | Handles solids without clogging |
| Chemical Processing | Viscous chemicals, polymers, slurries | Low pressure drop, no particle entrapment |
| Food & Beverage | Fruit pulp, dairy, viscous syrups, CIP fluids | Self-draining, easy cleaning, no stagnant areas |
| Pharmaceutical | High-purity fluids, WFI, buffer solutions | Smooth flow, no dead spaces |
| Mining | Thick slurries, abrasive tailings | Full bore passage of solids |
| Pulp & Paper | Stock, pulp, coatings | Handles fibrous materials without clogging |
| Wastewater | Raw sewage, sludge, grit | Clog-free operation |
11. Limitations & Recommendations
| Parameter | Limitation |
|---|---|
| Maximum Temperature | 120°C (248°F) for continuous service |
| Minimum Temperature | -40°C (-40°F) |
| Maximum Pressure | 10 bar (145 psi) at ambient temperature (derate at elevated temperatures) |
| Fluid Compatibility | Not suitable for hydrocarbons, oils, solvents, or strong oxidizing acids |
| Vacuum Service | Limited capability – consult manufacturer |
| Steam Service | Intermittent only – consult for steam duty cycles |
| Actuation | Higher torque requirements than weir type due to larger diaphragm area |
Remarks:
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Straight-through diaphragm valves require higher closing force than weir type – ensure actuator sizing accounts for this.
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For temperatures above 120°C, alternative diaphragm materials (PTFE/EPDM-backed) are available.
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Face-to-face dimensions vary by manufacturer – verify before installation.
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For FDA-compliant EPDM, please specify during ordering.
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Sanitary clamp ends (Tri-Clamp) available for biopharmaceutical applications upon request.
This data sheet is for reference only. All specifications are subject to final confirmation by the manufacturer based on specific service conditions.
