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 Leakproof Metal Seated Gate Valve PN25 NRS (Model 1006) is a high-pressure, low-maintenance sluice valve engineered for demanding industrial and water infrastructure applications where PN25 (25 bar / 362 psi) pressure capability, leakproof metal-to-metal sealing, and minimal lifetime maintenance are non-negotiable requirements. Built with a GGG50 ductile iron body and bonnet, precision-lapped gunmetal seat rings, non-rising stem (NRS), and 100% fusion bonded epoxy coating, this valve is designed to operate reliably for decades with only the most basic periodic attention — even under sustained high-pressure service. Manufactured by Shandong Huaze Valve Co., Ltd. with over 25 years of specialized valve production, every Model 1006 is individually hydrostatically tested at 37.5 bar shell / 27.5 bar seat per EN 1074-1/-2.

The term "Sluice Valve" — the traditional British English designation for a gate valve used in waterworks — reflects the Model 1006's dual-market positioning: manufactured to DIN 3352 standards but equally suitable for projects specifying sluice valves in Commonwealth and international contexts. The metallic seat, PN25 rating, and low-maintenance NRS design make it particularly well-suited for high-head pumping stations, long-distance transmission mains with significant elevation profiles, industrial process isolation, and any installation where valve accessibility for maintenance is limited.

Key Features

PN25 High-Pressure Rating — Engineered for the Extreme

Rated for 25 bar continuous working pressure — a substantial 56% increase over standard PN16 class valves. Shell tested at 37.5 bar and seat tested at 27.5 bar, the Model 1006 handles system pressures that would exceed the safety margins of conventional gate valves. This higher pressure capacity is achieved through optimized GGG50 ductile iron wall thickness design, precision-machined bonnet joint geometry, robust stainless steel A2-70 bonnet bolting, and EN 1092-2 PN25 flange drilling. Applications include deep-well pumping stations with high discharge heads, long-distance transmission pipelines traversing significant elevation changes, high-rise building water supply risers, and industrial processes operating well above municipal distribution pressures.

Leakproof Metal Seat — Precision Sealing Without Elastomers

The leakproof performance of the Model 1006 is achieved through precision-engineered metal-to-metal sealing: the body seat ring and wedge facing are both machined from high-grade gunmetal (bronze alloy) and precision-lapped to create a tight, uniform contact band around the entire sealing perimeter. Unlike resilient seats that rely on elastomer compression, the metallic seat's sealing integrity is purely geometric — it cannot age, cannot take a compression set, and cannot be chemically degraded. The gunmetal alloy's natural corrosion resistance ensures the sealing surfaces remain smooth and effective through decades of intermittent or continuous service. For raw water, industrial cooling water, and process fluids where elastomer compatibility is a concern, the all-metal seat is the definitive solution.

Low Maintenance by Design — Install It and Forget It

Every aspect of the Model 1006 is engineered to minimize — and in many cases eliminate — routine maintenance requirements: (1) NRS enclosed stem — permanently lubricated by the line fluid, no external greasing required; (2) gunmetal seat rings — no elastomer to replace, no compression set to compensate for; (3) stainless steel stem and fasteners — no rust, no seizure, no broken bolts during future disassembly; (4) FBE coating — impermeable, self-protecting, no repainting required; (5) PTFE-impregnated gland packing — low friction, long-life stem seal that is field-adjustable if ever needed. For buried installations, remote pumping stations, and unmanned facilities where maintenance access is difficult or expensive, the Model 1006's low-maintenance design directly reduces lifetime operating costs.

NRS — Non-Rising Stem, Non-Stop Reliability

The NRS mechanism positions the entire threaded stem assembly — stainless steel SS420/SS431 stem with precision-rolled trapezoidal threads and high-strength bronze stem nut — inside the valve body cavity. The stem never extends above the valve during operation; the handwheel position remains fixed. This delivers: a compact installation profile with predictable space requirements; complete protection of the stem threads from external contamination, corrosion, and physical damage; continuous internal lubrication eliminating the need for periodic stem greasing; and consistently low operating torque maintained over the valve's entire service life. For high-pressure PN25 service, the enclosed stem design also eliminates a potential external leak path — an additional safety benefit.

Ductile Iron Body — The Strong Foundation

The GGG50 ductile iron (EN-GJS-500-7) body and bonnet provide the structural integrity required for sustained PN25 operation. With 500 MPa ultimate tensile strength and minimum 7% elongation, ductile iron delivers approximately double the load-bearing capacity of gray cast iron while offering dramatically better toughness and crack resistance. At PN25 pressure levels, this material advantage becomes a genuine safety margin — the valve body absorbs water hammer transients, pipe stress loads, and accidental impact without the brittle fracture risk inherent in gray iron castings.

100% FBE Coating — Corrosion Protection Without Compromise

Fusion bonded epoxy applied electrostatically and oven-cured at minimum 250 um DFT on all internal and external surfaces, individually spark-tested at 3 kV for complete pinhole-free coverage. This thermosetting polymer coating forms a chemical bond with the ductile iron substrate — not merely a mechanical adhesion — providing an impermeable barrier against corrosion in aggressive soils, treated water, coastal salt spray, and industrial atmospheres. For the Model 1006's target applications (buried high-pressure mains, remote pumping stations, industrial plants), this coating system is a critical contributor to the valve's low-maintenance, long-service-life design philosophy.

Technical Specifications

Low Maintenance — The True Cost of a Valve