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BS5163 Resilient Seat Gate Valve PN16 NRS Corrosion Resistance BS Gate Valve
| MOQ: | 1 Set |
| Standard Packaging: | Wooden Case |
| Delivery Period: | Two Months |
| Supply Capacity: | 300 Containers / Year |
BS5163 Resilient Seat Gate Valve
,PN16 NRS Resilient Seat Gate Valve
,BS5163 ductile iron gate valve
Valves Tested according EN1074-1,-2
Working Pressure:16kg/cm²
Shell Test Pressure:24kg/cm²
Seat Test Pressure:18kg/cm²
Media:Water,Neutral Oil
Working Temperature:0-52°C
100％ Fusion Bonded Epoxy Coating for Inner and Outside Surface
Flange Drilled According to EN1092 PN10,PN16
Size:DN50--DN600
Product Overview
The BS5163 Resilient Seat Gate Valve PN16 NRS (Model 1051) combines the trusted British Standard BS 5163 design framework with advanced resilient-seat sealing technology to deliver a high-performance, corrosion-resistant isolation valve for water supply and industrial fluid systems. Featuring a ductile iron body, full-encapsulation EPDM wedge, non-rising stem (NRS) mechanism, and 100% fusion bonded epoxy coating, this valve is engineered for zero-leakage shutoff, minimal maintenance, and decades of reliable service in both above-ground and buried installations. Manufactured by Shandong Huaze Valve Co., Ltd. with over 25 years of specialized valve production expertise, every unit is individually tested to EN 1074-1/-2 standards.
What sets the Model 1051 apart is its combination of BS 5163 dimensional interchangeability with resilient-seat performance. Unlike traditional metallic-seat BS gate valves that rely on metal-to-metal contact, the 1051's fully vulcanized EPDM wedge delivers a bubble-tight, bidirectional seal at full rated pressure — eliminating the minor leakage that metallic seats can exhibit over time. This makes it the ideal choice for water authorities seeking to reduce non-revenue water losses, and for applications where absolute shutoff integrity is non-negotiable.
The NRS (Non-Rising Stem) design keeps the stem threads permanently enclosed within the valve body, protected from external contamination and permanently lubricated by the line fluid. With no upward stem travel during operation, the valve requires minimal installation headroom — a critical advantage in buried chambers, meter pits, and compact mechanical rooms where vertical clearance is at a premium.
Key Features
BS 5163 Compliant — Trusted Worldwide
Fully designed, manufactured and tested to BS 5163 — the benchmark British Standard for waterworks gate valves recognized by water authorities and consulting engineers across the UK, Ireland, the Middle East, Africa, Southeast Asia, and Commonwealth markets. Face-to-face dimensions, flange drilling, materials, and pressure-temperature ratings all conform to the standard, guaranteeing seamless drop-in replacement for existing BS 5163 installations.
Resilient EPDM Seat — Zero Leakage, Zero Compromise
The ductile iron wedge core is fully encapsulated within a seamless, vulcanized EPDM elastomer envelope — not merely rubber-faced, but completely enveloped. This monobloc construction eliminates the risk of rubber delamination, delivers a bubble-tight bidirectional seal at 18 bar seat test pressure, and is WRAS-compatible for potable water duty. Unlike metallic seats that can exhibit minor weepage over time, the resilient seat maintains absolute shutoff for the life of the valve.
NRS — Compact, Protected, Low Maintenance
The Non-Rising Stem configuration internally positions the threaded stem mechanism, keeping it continuously lubricated and shielded from external dust, grit, and corrosion. With no stem extending upward during operation, the valve occupies a fixed profile height — reducing valve chamber dimensions, excavation costs, and civil works expenses. No exposed stem also means nothing to clean, grease, or protect from accidental damage during backfilling.
Superior Corrosion Resistance — Built to Last
Corrosion is the number one enemy of buried valves. The Model 1051 tackles it on three fronts: (1) GGG50 ductile iron body and bonnet — inherently more corrosion-resistant than gray cast iron; (2) 100% fusion bonded epoxy coating at minimum 250 um DFT on all internal and external surfaces, electrostatically applied and oven-cured for an impermeable, pinhole-free barrier; (3) stainless steel stem (SS420/SS431) — immune to the rust and pitting that plague carbon steel stems in wet environments. Together, these protections ensure a 30+ year service life even in aggressive soils, coastal atmospheres, and chemically treated water.
Full Bore, Low Head Loss
The smooth, unobstructed waterway with full-bore internal diameter matches the connecting pipe ID, minimizing turbulence, pressure drop, and energy consumption across the pumping system. No sediment accumulation pockets, and the clean bore profile is fully compatible with pipeline cleaning and inspection pigs — an important consideration for water main maintenance programs.
Low-Torque Operation — Energy Efficient
Precision-rolled stainless steel stem threads paired with a self-lubricating bronze stem nut deliver exceptionally smooth, low-friction operation. Handwheel torque remains well within comfortable single-operator limits across the full DN50 to DN600 range (with gearbox assist standard from DN300 upward). Lower torque means faster field operation, reduced actuator sizing for motorized installations, and less wear on all drivetrain components.
Materials of Construction
| Component | Material |
| Body & Bonnet | Ductile Iron EN-GJS-500-7 (GGG50) |
| Wedge | Ductile Iron Core + Full EPDM Encapsulation |
| Stem | Stainless Steel SS420 / SS431, Precision Rolled Threads |
| Stem Nut | High-Strength Bronze (Self-Lubricating) |
| Body-Bonnet Gasket | EPDM (WRAS-compatible grade) |
| Gland Packing | PTFE-Impregnated Synthetic Fiber Braid |
| Bonnet Fasteners | Stainless Steel A2-70 / Zinc-Plated Grade 8.8 Carbon Steel |
| Corrosion Protection | Fusion Bonded Epoxy, min 250 um DFT, Internal & External, RAL 5015 Blue |
Size Range & Technical Data
| Specification | Value |
| Design Standard | BS 5163 Type A (Resilient-Seated Gate Valve for Waterworks) |
| Test Standard | EN 1074-1 / EN 1074-2 / EN 12266-1 |
| Nominal Pressure | PN16 (16 bar / 232 psi) |
| Available Sizes | DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300, DN350, DN400, DN450, DN500, DN600 |
| Face-to-Face | BS 5163 Table 2 (Long Pattern) |
| Flange Standard | EN 1092-2, PN10 / PN16 Dual-Rated Drilling |
| Stem Type | NRS — Non-Rising Stem (Internal Thread) |
| Seat Type | Resilient — Full EPDM Wedge Encapsulation |
| Operation | Handwheel (Manual); Gearbox Fitted Standard for DN300 and Above |
Corrosion Protection System — Three-Layer Defense
Ductile Iron Substrate
GGG50 ductile iron (EN-GJS-500-7) provides inherently better corrosion resistance than gray cast iron due to its spheroidal graphite microstructure. Higher strength means thinner, optimized wall sections with no compromise on safety margins.
FBE Coating Barrier
100% fusion bonded epoxy at minimum 250 um DFT on every internal and external surface. Electrostatic application + oven curing creates a chemically bonded, impermeable layer. Spark-tested at 3 kV for guaranteed pinhole-free coverage.
Stainless Steel Internals
SS420/SS431 stem + bronze stem nut + stainless fasteners — all internal moving and bolted components are inherently corrosion-resistant. No carbon steel parts in contact with the line fluid to rust, seize, or compromise operability over time.
Typical Applications
- Municipal Potable Water Distribution — Trunk Main & Branch Isolation
- Water Treatment Plants — Raw Water, Process & Finished Water Lines
- Wastewater & Sewage Treatment — Inlet/Outlet & Bypass Isolation
- Water Booster & Transfer Pumping Stations
- Agricultural & Landscape Irrigation Distribution Networks
- Fire Protection Water Supply — Fire Main & Hydrant Feed Isolation
- Building Services — HVAC Chilled Water & Cooling Tower Circuits
- Industrial Process Water — Food & Beverage, Textile, Paper Mills
- Reservoir & Storage Tank — Inlet, Outlet & Drain Valves
- Buried Valve Chambers — Where Corrosion Resistance is Critical
BS 5163 Resilient Seat — The Best of Both Worlds
The Model 1051 occupies a unique position in the gate valve portfolio — it pairs the globally recognized BS 5163 dimensional standard (ensuring compatibility with existing pipework, flanges, and actuator interfaces) with resilient-seat sealing technology (delivering zero-leakage shutoff that traditional metallic-seat BS valves cannot match). This combination is increasingly specified by water authorities seeking to upgrade network performance without changing installation dimensions or procurement specifications.
| Feature | BS 5163 Resilient Seat (1051) | BS 5163 Metallic Seat |
| Shutoff Tightness | Bubble-Tight, Bidirectional | Rate B / Minor Weepage Allowed |
| Non-Revenue Water | Eliminated at Isolation Points | Potential Minor Loss Over Time |
| Seat Wear Resistance | EPDM — Excellent Elastic Recovery | Gunmetal — Excellent for High-Cycle |
| Suspended Solids Tolerance | Good — Encapsulated Wedge Wipes Clean | Excellent — Metal Not Scored |
| Potable Water | Excellent — WRAS EPDM | Good — Gunmetal Approved |
| Best Application | Distribution Isolation, NRW Control | High-Cycle, Raw Water, Sludge |
Quality Assurance — 100% Individual Testing
No statistical sampling — every single valve undergoes the full test regimen:
- Shell Hydrostatic Test — 24 bar (1.5 x PN), 60-second minimum hold, zero leakage permitted through the pressure boundary
- Seat Tightness Test — 18 bar (1.1 x PN), bidirectional, per EN 1074-2 Rate A (zero visible leakage)
- FBE Coating Inspection — Dry film thickness verification (min 250 um) + 3 kV holiday (spark) detection test on 100% of coated surface area
- Dimensional Verification — Face-to-face length, flange outside diameter, bolt circle diameter, bolt hole size and quantity, stem straightness, handwheel alignment
- Operational Torque Test — Full open-to-close-to-open cycle with torque measurement confirmed within BS 5163 specified limits
- Material Certification — EN 10204 Type 3.1 material test certificates for body casting, bonnet casting, stem, and wedge available on request for project documentation packages
Ordering Information
| Item | Details |
| Model Number | 1051 |
| Minimum Order Quantity | 1 Set — Sample and trial orders warmly welcomed |
| Packaging | Export-grade plywood cases with internal bracing and desiccant packs; valve bore ends protected with plastic caps; handwheel packed separately for DN300 and above |
| Delivery Lead Time | Approximately 2 months (varies by total order quantity and customization requirements) |
| Production Capacity | 300 Containers / Year — well-equipped for large infrastructure tenders |
| Port of Loading | Qingdao, China — direct sailings to major ports worldwide |
| Customization Options | Alternative flange drillings (ANSI B16.1 Class 125, JIS B2220 10K, AS 2129 Table E), electric/pneumatic actuator adaptation with ISO 5211 mounting flange, limit switch boxes, buried-service indicator posts and extension spindles, custom RAL coating colors, and OEM branding/packaging |
About Shandong Huaze Valve Co., Ltd.
Established in 1998, Shandong Huaze Valve is a specialized manufacturer of industrial and municipal valves with a workforce of 100-200 skilled employees and an annual output capacity of 300 containers. Our comprehensive product range covers Gate Valves (BS 5163, DIN 3352, SANS 664, Custom), Check Valves (Swing & Wafer), Air Valves, Globe Valves, Flap Valves, Fire Hydrants, and Y/T Strainers — enabling single-source procurement for complete project valve packages. ISO 9001 certified with an annual turnover of USD 5-6 million, we are a financially stable manufacturing partner trusted by water utilities, EPC contractors, and valve distributors in over 30 countries. Our location in Qingdao, adjacent to one of the world's top-ten container ports, ensures efficient logistics and competitive freight rates to all major global destinations.
