The Direct Buried Gate Valve is engineered for underground municipal water networks where standard valve chambers are omitted. Built with an integrated extension stem and heavy-duty corrosion protection, it allows direct soil backfilling while maintaining reliable surface operation. Designed for high-frequency municipal networks, it minimizes excavation maintenance risks.
Technical Specifications
|
Parameter |
Specification |
|
Size Range |
DN50 to DN600 (2 inches to 24 inches) |
|
Pressure Rating |
PN10 / PN16 / PN25 |
|
Working Temperature |
0°C to 80°C |
|
Connection Standard |
Flanged to EN 1092-2, ISO 7005-2, ASME B16.42 |
|
Face-to-Face Length |
DIN 3202 F4 / F5, ISO 5752 Series 14 / 15 |
|
Body & Wedge Material |
Ductile Iron (EN-GJS-500-7 / ASTM A536 65-45-12) |
|
Stem Material |
Stainless Steel 420 / 316 |
|
Operation Type |
Extension Spindle / T-Key / Electric Actuator |
Key Features
Zero-Leakage Resilient Seating: The ductile iron wedge is fully encapsulated with high-grade EPDM. A flat-bottom seat design prevents debris accumulation, ensuring bubble-tight shut-off (ISO 5208 Rate A).
Direct Burial Protection: Triple O-ring stem sealing system prevents groundwater infiltration. Upper and lower thrust collars distribute operating torque evenly.
Corrosion-Resistant Coating: Internal and external surfaces are coated with Fusion Bonded Epoxy (FBE) powder, minimum 250 microns thickness, tested for 1000-hour salt spray resistance.
Non-Rising Stem Design: Minimizes required installation space and protects thread components from underground soil contact.
Applications
Underground municipal water supply and distribution trunk lines
District Metering Area (DMA) subterranean isolation points
Desalination plant raw water intake pipelines
Underground firefighting water grids
Industrial cooling water networks without vault chambers
Manufacturing & Customization
Casting & Machining: Produced via automatic resin-sand casting lines. Critical sealing surfaces and flange faces finished on CNC horizontal boring mills to guarantee dimensional tolerance.
Customization Options:
Customized extension stem lengths tailored to specific burial depths (e.g., 1.5 meters to 4 meters).
Alternative trim materials: SS304 or SS316 stems for aggressive soil conditions.
ISO 5211 top mounting flange for gearbox or actuator adaptation.
Testing, Quality & Documentation
Factory Testing: Every valve undergoes shell and seat pressure testing in accordance with EN 12266-1 / ISO 5208 before dispatch.
Shell test: 1.5 times PN
Seat test: 1.1 times PN
Traceability: Heat numbers and casting lot IDs are permanently cast onto valve bodies to ensure complete metallurgical traceability back to the raw material batch.
Documentation Provided: Material Test Certificate (EN 10204 3.1), Individual Pressure Test Report, Coating Thickness Inspection Report, and Operation & Maintenance Manual.
FAQ
Q: What is the IP rating of the direct buried gate valve assembly?
A: The operating components and extension rod housing are sealed to IP68 standards, protecting internal mechanisms from groundwater submersion and silt ingress.
Q: How is torque transmitted at deep burial depths?
A: The extended spindle is connected via a pinned coupling socket designed to handle rated operating torque without shearing under high soil loads.
Q: What is your standard production lead time?
A: Standard DN50 to DN300 sizes in PN16 are stocked in semi-finished components, requiring 15 to 25 days for assembly, coating, and testing.
Request a Quote & Engineering Resources
To evaluate this product for your pipeline specifications, download our technical files or submit your project parameters below:
To receive a formal quotation, please specify:
Diameter (DN) and Pressure Rating (PN)
Burial depth / Extension stem length requirement
Flange drilling standard (EN, ISO, or ANSI)
Required quantity and destination port
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