The Ductile Iron Underground Gate Valve is engineered for direct burial in municipal water distribution, fire protection, and underground utility networks. Designed for subsurface installation without a concrete valve vault, it features a heavy-duty wedge disc, non-rising stem, and a reinforced body structure built to withstand high external soil loads and ground shifting.
Manufactured in-house under strict ISO standards, our production line integrates raw material smelting, precision CNC machining, electrostatic epoxy coating, and 100% hydrostatic testing to ensure zero-leakage performance for critical infrastructure.
Technical Specifications
|
Parameter |
Standard Specification |
|
Size Range |
DN50 – DN600 (2" – 24") |
|
Pressure Rating |
PN16 / PN25 / 200 PSI / 300 PSI |
|
Design Standards |
AWWA C515, BS 5163-2, DIN 3352 (F4/F5), EN 1074-2 |
|
Body & Bonnet Material |
Ductile Iron (ASTM A536 65-45-12 / EN-GJS-500-7) |
|
Wedge Material |
Ductile Iron fully encapsulated with EPDM / NBR |
|
Stem Material |
Stainless Steel (AISI 420 / AISI 316) |
|
Coating |
Fusion Bonded Epoxy (FBE) interior and exterior, DFT >= 250 um (WRAS / AWWA C550 compliant) |
|
Operation |
2-inch Square Operating Nut, Handwheel, or ISO 5210 Top Flange for Gearbox/Actuator |
Key Features
Resilient Seated Design: EPDM/NBR rubber-encapsulated wedge provides bubble-tight shut-off (Zero Leakage) complying with EN 12266 Rate A.
Non-Rising Stem (NRS): Minimizes required burial space; stem threads are isolated from the media to prevent scaling and corrosion.
Anti-Friction Thrust Washers: Bronze/copper thrust washers lower operational torque and prevent stem galling under high differential pressure.
Triple O-Ring Sealing: Replaceable stem O-rings prevent external leakage and allow upper-seal maintenance under pressure.
Corrosion Defense: Automatic shot-blasting to Sa 2.5 followed by electrostatic FBE powder coating protects against aggressive soil-induced microbial corrosion.
Applications
Municipal Water Supply: Main transmission lines and regional potable water distribution grids.
Underground Fire Protection: Buried loops supplying fire hydrants and sprinkler systems (UL/FM compliant variants available).
Sewage & Wastewater: Subsurface effluent lines requiring high chemical and abrasion resistance.
Agricultural Irrigation: High-capacity underground water networks.
OEM & Customization
We support tailor-made manufacturing to match regional bidding specifications and pipeline interfaces:
Connection Standards: Flanged (EN 1092-2, ASME B16.42), Mechanical Joint (AWWA C111), and Push-on/Socket ends.
Accessories: Fully compatible with telescopic extension stems, operating caps, indicator posts, and surface valve boxes.
Private Labeling: Cast-in or laser-engraved customer logos, custom serial numbers, and project-specific nameplates.
Testing, Quality & Documentation
Quality control is enforced at every manufacturing milestone within our facility:
Material Traceability: Spectrometer chemical composition analysis and mechanical tensile/impact testing for every ductile iron melt batch.
Dimensional Verification: CMM and digital gauges checking face-to-face dimensions, flange drilling accuracy, and wall thickness.
Hydrostatic Pressure Testing: 100% shell and seat testing per ISO 5208 / EN 12266 (Shell test at 1.5 x PN, seat test at 1.1 x PN).
Coating Integrity Test: High-voltage spark holiday test (minimum 2.5kV) and cross-hatch adhesion test on the epoxy layer.
Documentation Pack: EN 10204 3.1 Material Test Certificate, Hydrostatic Test Report, and Coating Thickness Report issued prior to dispatch.
FAQ
Q: Are these valves suitable for direct burial without a concrete vault?
A: Yes. When paired with a telescopic extension stem and operating nut, they are structurally designed for direct burial. A surface valve box is only required to house and access the operating nut at ground level.
Q: What is the expected lifespan of the epoxy coating underground?
A: The FBE coating is applied at >= 250 um on a Sa 2.5 blast-cleaned surface, engineered for a 30+ year service life under standard soil conditions.
Q: What is the standard lead time for bulk municipal orders?
A: Standard sizes (DN50–DN300) in regular pressure ratings are typically ready for shipment within 25 to 35 days. Custom configurations depend on tooling requirements.
Request a Quote & Engineering Resources
Provide your project parameters to receive a technical proposal, CAD files, and a commercial quotation within 24 hours.
Required RFQ Parameters: Diameter, Pressure Rating, Connection Standard, Quantity, and Destination.
Email: sales@keylionvalve.com
Direct Inquiry Form: [Link to RFQ Submission Page]
Download Center: [Link to 2D/3D CAD Drawings & PDF Datasheet]
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