EPDM Fully Internal Lined Butterfly Valves

Description

DN1400 PN16 EPDM Fully Internal Lined Butterfly Valve — Technical Data Sheet

1. General Description

This DN1400 (NPS 56″) PN16 butterfly valve is designed with a fully internal lined construction, where the body and disc are completely encapsulated with EPDM (Ethylene Propylene Diene Monomer) rubber. The concentric (resilient seated) design ensures complete isolation of all metallic components from the process fluid, providing bi‑directional zero leakage. The valve is ideally suited for large-diameter water, wastewater, seawater, and general industrial non-oil fluid applications.

Available in double-flanged, wafer, or lug body configurations, it is typically supplied with a manual gearbox as standard. Electric, pneumatic, and hydraulic actuation are also available. All design, manufacturing, and testing are conducted in accordance with applicable EN/ISO standards.

2. Technical Specifications

Parameter Specification
Nominal Size DN1400 (NPS 56″)
Pressure Class PN16 (Class 150)
Valve Type Concentric / Resilient Seated Butterfly Valve
Construction Fully Internal Lined
Connection Type Double Flanged / Wafer / Lug
Design Standard EN 593, MSS SP-67
Face-to-Face EN 558 Series 14 (Long) / Series 15 (Short) / Series 13 (Wafer)
Flange Standard EN 1092-2 PN16 (BS EN, DIN)
Testing Standard EN 12266-1 / ISO 5208 Rate A
Operation Gearbox (Standard) / Electric / Pneumatic / Hydraulic
Top Flange Mounting ISO 5211 (or special gear interface for large sizes)
Lining Thickness Body: ≥ 3.5 mm (nominal), Disc: ≥ 3.0 mm
*Note: Face-to-face dimensions comply with EN 558 for the specified series. Flange drilling per EN 1092-2 PN16. Production test per EN 12266-1 Rate A (zero leakage).*

3. Materials of Construction

Component Material
Body Ductile Iron GJS‑400‑15 / GJS‑500‑7, Carbon Steel WCB, or Stainless Steel CF8/CF8M
Body Lining EPDM (Molded vulcanized, seamless)
Disc Ductile Iron / Carbon Steel / SS316, Fully Encapsulated in EPDM
Stem Stainless Steel SS420 / SS304 / SS316, Blow‑out Proof Design
Bearing / Bushing Self-lubricating Bronze or PTFE‑Composite
Seat Integrated EPDM Lining (molded together with body lining)
O‑Rings EPDM / NBR
The body lining is formed by high-pressure vulcanization, ensuring a strong mechanical bond and uniform thickness. The disc is fully encapsulated with EPDM by a molding process, leaving no exposed metal. The stem features an integral safety step to prevent blow‑out under full differential pressure.

4. Performance Data

4.1 Operating Conditions

Parameter Value
Operating Temperature -20 °C to +120 °C (-4 °F to +248 °F)
Leakage Class Bi-directional Zero Leakage (EN 12266‑1 Rate A / ANSI FCI 70‑2 Class VI)
Vacuum Service Applicable for moderate vacuum within temperature limits (consult manufacturer)
4.2 Suitable Media

Water (potable, raw, cooling), seawater, wastewater, sludge, weak acids/alkalis, abrasive slurries, and general industrial fluids that do not contain mineral oils, greases, aromatic solvents, or chlorinated hydrocarbons.

4.3 Pressure–Temperature Ratings

(Based on PN16 EPDM mechanical properties — typical values, final envelope per manufacturer)

Working Temperature Maximum Allowable Working Pressure
-20 °C ~ +50 °C 16.0 bar
+80 °C 15.0 bar
+100 °C 13.0 bar
+120 °C 10.0 bar
Note: EPDM is not resistant to petroleum-based oils, greases, and hydrocarbon solvents. Ensure fluid compatibility before selection.
5. Key Dimensions — DN1400, PN16 (Double Flanged, Long Pattern)

(Reference values — final dimensions per certified drawing)

Dimension Approximate Value
Face-to-Face (L) 390 mm (EN 558 Series 14)
Overall Height (H) (with gearbox) ~2800 mm
Top Height (H1) ~1850 mm
Bottom Height (H2) ~950 mm
Flange Outside Diameter 1695 mm
Bolt Circle Diameter (PCD) 1620 mm
Bolt Holes 36 × Ø48 mm
Approx. Weight 1600–2200 kg
*Available short pattern (EN 558 Series 15) and wafer/lug designs may have different face-to-face dimensions; please specify when ordering.*

6. Lining Integrity & Quality Testing

Test Item Standard / Specification
Lining Visual Inspection 100% inspection for smoothness, cracks, bubbles, and bond defects
Lining Hardness ASTM D2240 (Shore A durometer)
Lining Thickness Non-destructive measurement; ≥ 3.5 mm body, ≥ 3.0 mm disc
Adhesion Test ASTM D429 (Method A/B) – specimen test
Spark Test (optional) Low voltage (1–3 kV) for pinhole detection upon request
Shell / Hydrostatic Test EN 12266‑1: 1.5 × PN (24 bar)
Seat Leakage Test EN 12266‑1 Rate A (Zero Leakage at 1.1 × PN = 17.6 bar)
All valves are hydrostatically shell‑tested and seat‑tested per the standard prior to delivery.

7. Actuator Mounting & Operation

7.1 Top Flange Mounting

The top flange conforms to ISO 5211 for direct mounting of quarter‑turn actuators and gearboxes. For DN1400, a large‑size mounting base (e.g., F35 / F40 or custom) is provided, often integrated with a robust manual gearbox.

7.2 Operation Modes

Mode Description
Manual Gearbox Standard supply; double‑reduction gear with handwheel for low rim pull
Electric Actuator On‑off or modulating, 3‑phase AC or 1‑phase AC / DC supply
Pneumatic Actuator Double‑acting or spring‑return, requiring high‑volume air supply
Hydraulic Actuator For high‑torque, fail‑safe, or subsea applications
8. Key Features

Full Isolation — The body and disc are completely encapsulated with EPDM, eliminating any metal contact with the medium and providing excellent corrosion protection.
Low Torque Operation — The naturally low friction of EPDM, combined with self‑lubricating bearings, reduces operating torque and prevents sticking, even after long static periods.
Bi-directional Sealing — The integrated EPDM seat and the spherically machined, fully lined disc ensure bubble‑tight shut‑off in both flow directions.
Blow‑out Proof Stem — Safety step design on the stem prevents ejection under maximum rated pressure.
Standardized Mounting — ISO 5211 top flange allows direct mounting of standard gearboxes and actuators.
Excellent Aging Resistance — EPDM offers outstanding resistance to ozone, UV, weathering, and permanent set, ensuring long service life.
No Maintenance — Self‑lubricating bearings and robust rubber lining eliminate the need for routine lubrication.
Low Flow Resistance — Streamlined disc profile and full port body design minimize pressure drop and turbulence.
9. Applicable Standards Summary

Category Standard
Design & Manufacturing EN 593, MSS SP‑67
Face‑to‑Face Dimensions EN 558 Series 13 / 14 / 15
Flange Dimensions EN 1092‑2 PN16
Inspection & Testing EN 12266‑1 (ISO 5208)
Actuator Mounting ISO 5211
Potable Water DVGW / WRAS / NSF/ANSI 61 (optional, EPDM formulation must be certified)
10. Typical Applications

EPDM fully internal lined butterfly valves are widely used in large‑diameter, low‑ to medium‑pressure systems for non‑oil media:

Municipal Water Supply & Distribution — Main lines, treatment plants
Wastewater Treatment — Raw sewage, effluent, sludge lines
Power Plants — Cooling water (once‑through & recirculating), condensers
Desalination Plants — Seawater intake, brine lines, RO feed water
Irrigation & Agriculture — Large‑scale water conveyance
Industrial & Process Water — Cooling, firewater, raw water
Mining & Slurry — Water transport lines, tailings (consult for abrasion)
Steel & Metal Industry — Cooling circuits, water recycling
11. Ordering Information

When ordering, please specify:

Item Description / Options
Nominal Size DN1400
Pressure Class PN16
Body Material Ductile Iron (standard) / Carbon Steel / Stainless Steel
Connection Type Double Flanged / Wafer / Lug
Face‑to‑Face EN 558 Series 14 (Long) / Series 15 (Short) / Series 13 (Wafer)
Operation Manual Gearbox / Electric Actuator / Pneumatic / Hydraulic
Lining Material EPDM (standard); NBR or other elastomers available upon request
Medium & Temperature Specify process fluid, operating temperature, and pressure
Certifications DVGW / WRAS / NSF‑61 (if required for potable water)
Accessories Limit switches, positioners, solenoid valves, declutchable gearboxes, chainwheels
*Example specification line: DN1400 PN16 EPDM Fully Internal Lined Butterfly Valve, Double Flanged, Ductile Iron Body, DI+EPDM Disc, Gearbox Operated, ISO 5211 Mounting, EN 558 Series 14 Length.*

12. Important Notes

This technical data sheet provides typical product data based on general industry standards. Exact dimensions, weights, and performance ratings shall be per the final vendor-certified drawing.
The pressure–temperature ratings are typical for an EPDM lining; the final envelope must be validated per the manufacturer’s specific data and test results.
EPDM is NOT compatible with mineral oils, greases, hydrocarbon solvents, or aromatic fluids. Ensure the process medium is free of such contaminants to avoid swelling or degradation of the lining.
For vacuum services, consult the manufacturer to confirm full vacuum capability within the specified temperature range.
Large‑diameter valves (≥DN1400) are heavy and require proper handling and sufficient pipe supports. Lifting lugs are normally provided on the valve body.
All valves are hydro‑tested per EN 12266‑1. Optional lining integrity spark testing can be added to the purchase order.
For potable water applications, ensure the EPDM compound is certified to the relevant local standard (e.g., DVGW, WRAS, NSF/ANSI 61).