Reliable Gate Valve Flange Type BS5163 PN25 NRS Excellent Sealing Performance

Valves Tested according EN1074-1,-2

Working Pressure:25kg/cm²
Shell Test Pressure:37.5kg/cm²

Seat Test Pressure:27.5kg/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 PN25
Size:DN50--DN300

Product Overview

The BS5163 Flange Type Gate Valve PN25 NRS (Model 1052) is a high-pressure ductile iron gate valve engineered for water supply networks and industrial fluid systems requiring PN25 (25 bar / 362 psi) pressure capability — a significant step above standard PN16 class valves. Designed in full compliance with BS 5163, this non-rising stem (NRS) gate valve delivers exceptional sealing reliability, robust structural integrity, and long-term corrosion protection for demanding municipal and industrial applications. 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 at full rated pressure.

The PN25 rating makes the Model 1052 the go-to choice for high-head water distribution systems, deep-well pumping stations, long-distance transmission mains, and industrial processes where system pressures exceed typical PN10/PN16 limits. The ductile iron GGG50 body and bonnet — with their superior tensile strength and elongation properties — provide the structural margin required for sustained PN25 operation with full safety factor compliance.

Key Features

PN25 High-Pressure Capability

Rated for 25 bar working pressure with shell tested at 37.5 bar (1.5x PN) and seat tested at 27.5 bar (1.1x PN) — substantially exceeding the PN16 class common in waterworks gate valves. This higher pressure rating is achieved through optimized wall thickness design in the GGG50 ductile iron castings, precision machining of the bonnet joint, and robust bonnet bolting with stainless steel fasteners. Ideal for high-head pumping stations, long-distance transmission mains with significant elevation changes, and industrial processes operating above standard water distribution pressures.

Excellent Sealing Performance — Engineered for Zero Leakage

The heart of the Model 1052's reliability is its precision-engineered sealing system. The wedge and body seat interface is machined to tight tolerances, ensuring uniform contact pressure across the entire sealing perimeter. The full-encapsulation design of the wedge (with appropriate resilient material) delivers a bidirectional, bubble-tight seal at the full 27.5 bar seat test pressure. The body-bonnet joint features an EPDM gasket in a precision-machined groove, ensuring pressure-boundary integrity at test pressures exceeding 37 bar without leakage or deformation.

BS 5163 Design — Industry Standard Since 1974

Conforming to BS 5163 ensures full dimensional and performance interchangeability with existing water authority installations. Face-to-face lengths, flange dimensions, materials, and test procedures all align with the standard, giving consulting engineers, contractors, and water utility procurement teams confidence in specification compliance. The standard is widely specified across the UK, Commonwealth nations, Middle East, Africa, and Southeast Asia — making the Model 1052 a globally deployable solution.

NRS — Compact Installation Profile

The Non-Rising Stem (NRS) design encloses the stem thread mechanism inside the valve body, where it remains permanently lubricated by the line fluid and protected from external contamination. With zero vertical stem travel during operation, the valve maintains a fixed overall height — reducing valve chamber dimensions, excavation costs, and civil works requirements. This is particularly advantageous in urban buried installations where space constraints and installation economics are critical considerations.

Complete Corrosion Protection

100% fusion bonded epoxy coating at minimum 250 um DFT on all internal and external surfaces, electrostatically applied and oven-cured. Spark-tested at 3 kV for complete pinhole-free coverage. This impermeable barrier, combined with the inherently corrosion-resistant GGG50 ductile iron substrate and stainless steel internal components (stem, fasteners), ensures the valve maintains full structural and operational integrity through decades of service in aggressive soil conditions and treated water environments.

Reliability by Design — Quality You Can Depend On

Reliability is not an accident — it is designed in from the foundry floor to the final test bay. Every Model 1052 valve undergoes 100% individual testing: shell test at 37.5 bar, seat test at 27.5 bar, coating inspection, dimensional verification, and operational torque measurement. EN 10204 Type 3.1 material certificates are available on request for full traceability. With ISO 9001 quality management and over 25 years of manufacturing consistency, the Model 1052 delivers the dependable performance that water utilities and industrial operators count on — year after year, decade after decade.

Technical Specifications

PN25 — When Pressure Matters

Typical Applications

• High-Head Municipal Water Distribution Networks
• Deep-Well and Borehole Pumping Station Discharge Isolation
• Long-Distance Water Transmission Pipelines with Elevation Changes
• Water Treatment Plant High-Pressure Process Lines
• Industrial Cooling Water Systems (Power Plants, Refineries, Steel Mills)
• Fire Protection Water Supply Mains (High-Pressure Zones)
• Reservoir and Elevated Storage Tank Outlet Isolation
• Irrigation Pump Station Discharge Manifolds
• Mining Process Water and Dewatering Systems

Quality Assurance

• Shell Hydrostatic Test — 37.5 bar, 60-second hold, zero leakage
• Seat Tightness Test — 27.5 bar, bidirectional, EN 1074-2 Rate A
• FBE Coating Inspection — DFT min 250 um + 3 kV holiday spark test, 100% surface
• Dimensional Verification — Face-to-face, flange dimensions, stem alignment
• Operational Torque Test — Full cycle within specified limits
• Material Certification — EN 10204 3.1 available on request

Ordering Information

About Shandong Huaze Valve Co., Ltd.

Established in 1998, Shandong Huaze Valve is an ISO 9001 certified manufacturer of industrial and municipal valves with 100-200 skilled employees and an annual output of 300 containers. Our product range spans Gate Valves (BS 5163, DIN 3352, SANS 664, Custom), Check Valves, Air Valves, Globe Valves, Flap Valves, Fire Hydrants, and Strainers — covering every valve requirement from a single trusted source. With an annual turnover of USD 5-6 million and over 25 years of continuous manufacturing, we are a stable, reliable, long-term partner for water utilities, EPC contractors, and valve distributors worldwide.