Product Overview
The Ductile Iron Resilient Seated Gate Valve provides drop-tight fluid isolation for drinking water networks, distribution systems, and industrial liquid pipelines. Built with a high-strength ductile iron body and an EPDM/NBR encapsulated wedge, it ensures bubble-tight sealing under high operating pressures. Its unobstructed full-bore passage minimizes pressure drop and pumping costs, making it suitable for both above-ground and underground buried services.
Key Features of Ductile Iron Resilient Seated Gate Valve
Ductile Iron Body: Delivers high tensile strength and impact resistance superior to standard cast iron.
Encapsulated Resilient Wedge: Provides drop-tight, zero-leakage shut-off with excellent compression memory.
Unobstructed Full-Bore Passage: Eliminates flow resistance and prevents debris buildup in the valve channel.
Fusion-Bonded Epoxy Coating: Protects internal and external surfaces against corrosion and tuberculation.
Multiple Actuation Options: Supports handwheel, square nut, gear operation, and electric actuation.
Standardized Flanged Ends: Precision-machined to connect with international pipe flange standards seamlessly.
Technical Specifications
|
Parameter |
Specification |
|
Product Type |
Ductile Iron Resilient Seated Gate Valve |
|
Design Standards |
BS EN 1074-2 / BS 5163 / DIN 3352 / AWWA C509/C515 |
|
Body / Bonnet Material |
Ductile Iron (EN-GJS-450-10 / ASTM A536) |
|
Wedge Material |
Ductile Iron with EPDM or NBR Coating |
|
Stem Material |
Stainless Steel (AISI 420 / 304 / 316) |
|
Nominal Size |
DN40 to DN600 (1.5" to 24") |
|
Pressure Rating |
PN10 / PN16 / Class 125 / Class 150 |
|
End Flange Standard |
EN 1092-2 / ANSI B16.1 / BS 4504 |
|
Face-to-Face Standard |
EN 558-1 Series 14/15, DIN 3202 F4/F5 |
|
Protective Coating |
Fusion Bonded Epoxy (FBE), minimum 250 µm |
|
Temperature Range |
-10°C to +70°C (EPDM) / -10°C to +80°C (NBR) |
|
Fluid Media |
Potable water, raw water, neutral liquids, treated sewage |
Valve Construction
Ductile Iron Body
Forms the primary pressure boundary, optimized to withstand line stress while maintaining low pressure drop.
Resilient Wedge
Features a ductile iron core encapsulated in resilient rubber to guarantee bi-directional bubble-tight sealing.
Stainless Steel Stem
Uses cold-rolled threads to provide corrosion resistance and low operating torque.
Sealed Bonnet
Encloses stem mechanics while allowing top-entry access for online maintenance.
Multi-O-Ring Stem Seal
Prevents external leakage and allows seal replacement under operating pressure.
How Does a Ductile Iron Resilient Seated Gate Valve Work?
A resilient seated gate valve operates by driving a rubber-coated wedge vertically across the flow path.
Opening: Turning the stem counterclockwise raises the wedge completely into the bonnet, creating a full flow passage.
Closing: Turning the stem clockwise pushes the wedge downward. The elastic rubber compresses against the smooth valve seat to stop flow completely.
Operational Intent: Gate valves are strictly designed for full-open or full-closed isolation service, not continuous flow throttling.
Applications of Ductile Iron Resilient Seated Gate Valve
Potable Water Mains
Ensures safe, reliable section isolation across municipal drinking water networks.
Raw Water Intake Systems
Delivers clog-free shut-off performance in intake channels and raw water supply lines.
Wastewater Treatment Plants
Provides tight fluid isolation around pumps, aeration tanks, and effluent lines.
Pumping Stations
Installs on suction and discharge headers for safe pump isolation and line maintenance.
Building Water Services
Controls main supply lines in high-rise commercial structures and industrial facilities.
Agricultural Irrigation
Manages line sectioning across high-volume primary and secondary distribution pipes.
Resilient Seated Gate Valve vs. Metal Seated Gate Valve
|
Feature |
Resilient Seated Gate Valve |
Metal Seated Gate Valve |
|
Sealing Surface |
Elastomeric rubber against body |
Metal-to-metal (Bronze/Stainless steel rings) |
|
Shut-Off Level |
Zero-leakage shut-off (Class VI) |
Allowable seat leakage rate (Class IV) |
|
Flow Channel |
Smooth bottom prevents debris trapping |
Bottom recess can collect sediment and scale |
|
Operating Torque |
Lower torque due to soft seating |
Higher torque required to seat through debris |
|
Primary Media |
Clean water, drinking water, treated sewage |
Steam, high-temperature fluids, dirty slurries |
Available Configurations
• Nominal pipe sizes from DN40 up to DN600.
• Working pressure ratings including PN10, PN16, and Class 150.
• Non-rising stem (NRS) for buried pipelines or rising stem (OS&Y) for visual position checks.
• Direct handwheels, operating nuts, or bevel gearboxes for heavy-duty operation.
• Flange drilling matching DIN, BS, ANSI, and ISO standards.
• Drinking-water certified elastomer options and high-durability epoxy coatings.
• Custom body markings, cast logos, serial numbers, and export packaging.
FAQ
Q: What is a ductile iron resilient seated gate valve?
A: It is an isolation valve using a ductile iron body and an elastomer-coated wedge to deliver zero-leakage shut-off in water pipelines.
Q: What is the difference between a resilient seated gate valve and a soft seal gate valve?
A: Both terms refer to the same design concept using a rubber-coated wedge for tight sealing. Always verify engineering datasheets and material standards for exact confirmation.
Q: Can a resilient seated gate valve be used for flow regulation?
A: No. Gate valves must operate fully open or fully closed. Throttling causes high-velocity turbulence that damages the elastomer wedge.
Q: What information is needed for an accurate product quotation?
A: Provide nominal size, pressure rating, fluid medium, operating temperature, flange drilling standard, operating mechanism, and coating requirements.
Q: Are customized flange standards and specialized coatings available?
A: Yes. Flange drilling patterns, face-to-face dimensions, coating thickness, and elastomer grades can be customized according to project specifications.
Q: What should be checked before ordering water distribution valves?
A: Verify working pressure, temperature ranges, flange connection standards, stem material grades, sealing rubber compatibility, and local drinking water compliance.
Hot Tags: ductile iron resilient seated gate valve, China ductile iron resilient seated gate valve suppliers
