Underground Reliability Solutions
A soft-sealing gate valve specially designed for direct burial installation. With an extended valve stem and a sealed operation structure, it does not require the construction of a well and can be directly buried underground. It meets the long-term reliable cutting and control requirements for municipal water supply, fire protection, and main trunk lines of the pipeline network.
Product Highlights
Direct burial installation, cost-effective: Eliminate the traditional valve well structure, extend the valve stem to the ground for operation, significantly reducing the cost and duration of civil construction and enhancing construction efficiency.
Bidirectional sealing, zero leakage guarantee: The gate plate is fully covered with highly elastic EPDM rubber, which precisely fits the valve body to form a bidirectional pressure seal, ensuring no leakage during long-term use.
Full-through flow channel, low flow resistance: After the valve is opened, the flow channel is consistent with the inner diameter of the pipeline, and the water flow resistance is extremely small. Pipeline cleaning and maintenance can be carried out using pigging devices.
Triple valve stem sealing system: A multi-layer O-ring combined sealing structure effectively prevents groundwater from seeping into the valve body and also prevents the leakage of the medium, ensuring long-term operational reliability.
Anti-corrosion coating system: The inner and outer surfaces are coated with food-grade epoxy resin by electrostatic spraying. The coating thickness is over 250 μm, with strong adhesion and resistance to soil corrosion. It complies with drinking water hygiene standards.
Flexible operation configuration: The standard square head design enables operation with a specialized wrench. An extendable operation rod or ground operation stake can be selected based on the burial depth to meet different working conditions.
Media Compatibility
Suitable for drinking water, domestic sewage, seawater and some weakly corrosive liquids.
Product Parameters Table
|
Project |
Specifications/Options |
|
Valve Type |
Soft-sealing Gate Valve |
|
Valve Stem Type |
Extended stem (either concealed stem or exposed stem is available), square head operation |
|
Nominal Diameter |
DN50 – DN600 |
|
Seal Material |
EPDM, NBR, HNBR |
|
Size Range |
DN80 - DN800 |
|
Pressure Rating |
PN10-PN25 |
|
Temperature Range |
-30°C to 80°C |
|
Operation Type |
Non-rising Stem |
|
Connection Type |
Flanged Ends |
Manufacturing Process
We select certified raw materials. Electric furnace melting occurs first. Precision casting forms components. CNC machining ensures accuracy. Robotic assembly follows. Automated testing completes production.
Main Materials
Valve body: Spheroidal graphite cast iron (ASTM A536 / EN GJS-400/450)
Gate plate: Spheroidal graphite cast iron (ASTM A536 / EN GJS-400/450) + Fully covered EPDM rubber
Valve stem: Stainless steel (SS304 / SS420 / SS431)
Sealing ring: EPDM (terpolymer ethylene propylene diene monomer rubber) / NBR (nitrile butadiene rubber)
Valve stem nut: High-strength brass or wear-resistant cast iron
Coating: Electrostatic spraying of epoxy resin (compliant with drinking water hygiene standards, such as WRAS, KTW)
Installation Steps
Prepare excavation area. Check valve condition. Clean connection surfaces. Position valve properly. Connect to pipeline. Backfill carefully. Test operation thoroughly.
Attachments and Optional Configurations
Operating tools: Special square-head locking wrench (standard equipment), ground operation lever with a positioning device
Extension component: Suitable for extending the valve stem for deep-buried installation
Valve identification: Ground valve identification sign, underground pipeline warning tape
Protection measures: Valve stem protective sleeve, telescopic opening and closing seat
Operation feedback: Underground valve actuating rod with signal feedback (for remote indication)
Packaging Details
We use heavy-duty wooden crates. Protective coatings prevent corrosion. Cushioning materials absorb shocks. Steel straps secure packages. Weather-resistant labels last.
Performance testing and quality assurance
Factory test: 100% conduct shell strength test and bidirectional sealing leakage test.
Test standard: Carried out strictly in accordance with EN 12266 or API 598 standards.
Special tests: Torque tests, life tests and third-party inspections can be conducted according to customer requirements.
Warranty commitment: Provide the material quality guarantee certificate, coating inspection report and product certificate of conformity.
After-Sales Service
We provide technical support. We offer installation guidance. We supply spare parts. We respond promptly. We ensure customer satisfaction.
Execution Standard
Design and manufacture: EN 1171, DIN 3352, BS 5163
Flange connection: EN 1092-2, GB/T 17241.6, ANSI B16.1 (optional)
Structural length: EN 558, DIN 3202
Pressure testing: EN 12266, API 598
Note: Materials, coatings and execution standards can all be customized according to the client's project requirements.
