SANS664 Ductile Iron Gate Valve PN16 NRS With Resilient Seat

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 SANS 1123-2003
Size:DN50--DN600

Product Overview

The SANS 664 Ductile Iron Gate Valve PN16 NRS With Resilient Seat (Model 1041) is a purpose-engineered gate valve manufactured in full compliance with SANS 664 — the South African National Standard for gate valves used in water supply, wastewater, and industrial fluid systems. This resilient-seated, non-rising stem (NRS) valve features GGG50 ductile iron construction, full-encapsulation EPDM wedge for zero-leakage bidirectional shutoff, 100% fusion bonded epoxy coating on all surfaces, and SANS 1123-2003 flange drilling for direct compatibility with South African pipework systems. Manufactured by Shandong Huaze Valve Co., Ltd. — an ISO 9001 certified specialist with over 25 years of valve production — every Model 1041 is individually tested to EN 1074-1/-2 at 24 bar shell and 18 bar seat.

SANS 664 is the definitive gate valve standard for the South African water industry and is widely specified by water boards, municipalities, consulting engineers, and contractors across South Africa, Namibia, Botswana, Zimbabwe, and neighboring SADC region markets. By manufacturing directly to SANS 664 with SANS 1123 flange drilling — rather than offering a DIN or BS equivalent — the Model 1041 eliminates the compromises of adapted valves and delivers genuine, tested compliance with the standard that South African projects demand.

Key Features

SANS 664 Compliant — Built for South African Specifications

The Model 1041 is designed, manufactured, and tested to SANS 664 — the South African Bureau of Standards specification for gate valves in waterworks applications. This includes compliance with SANS 664 dimensional requirements (face-to-face, flange drilling, stem dimensions), material specifications, pressure-temperature ratings, and test procedures. For consulting engineers specifying to SANS standards, water board procurement departments requiring SANS-certified products, and contractors installing in SANS-compliant pipework, the Model 1041 provides verified, documented compliance without the need for equivalence arguments, deviation requests, or additional approval paperwork. Flange drilling is per SANS 1123-2003 — the South African standard for pipe flanges — ensuring direct bolt-up compatibility with SANS-standard pipe flanges, valves, and fittings.

Resilient EPDM Seat — Zero Leakage, Zero Non-Revenue Water

The ductile iron wedge core is fully encapsulated within a seamless, vulcanized EPDM elastomer envelope — a monobloc construction that eliminates the delamination risk of bonded rubber facings. This resilient seat delivers a bubble-tight, bidirectional seal at the full 18 bar seat test pressure. For South African water utilities and municipalities facing the challenge of non-revenue water (NRW) reduction, the zero-leakage capability of the resilient seat at every isolation point makes a measurable contribution to water conservation targets. The EPDM compound is WRAS-compatible for potable water duty and maintains its elastic recovery properties across the full 0-52 deg C operating range typical of Southern African water systems.

NRS Design — Compact, Low-Maintenance Operation

The Non-Rising Stem mechanism encloses the stainless steel SS420/SS431 stem and bronze stem nut inside the valve body, where they are continuously lubricated by the line fluid and protected from external dust, grit, and moisture. The stem height remains fixed during operation — no upward extension, no exposed threads to maintain, and a constant, predictable valve chamber height. For Southern African installations where valves may be located in remote pump stations, buried in dusty semi-arid environments, or operated infrequently by mobile maintenance crews, the NRS design's inherent low-maintenance characteristics directly reduce field service requirements.

GGG50 Ductile Iron — Strength Without Brittleness

The body and bonnet are cast from GGG50 ductile iron (EN-GJS-500-7): 500 MPa tensile strength, 320 MPa yield strength, minimum 7% elongation. This provides approximately double the structural capability of gray cast iron with dramatically superior impact and crack resistance. For Southern African infrastructure — where valves may be transported long distances over rough roads, installed in variable ground conditions, and subjected to occasional water hammer from pump operations — ductile iron's toughness provides a genuine reliability advantage.

100% FBE Coating — Corrosion Protection for All Environments

Fusion bonded epoxy applied electrostatically to all internal and external surfaces at minimum 250 um DFT, oven-cured to form a chemically cross-linked thermosetting polymer barrier, and individually spark-tested at 3 kV on every valve. This coating protects the ductile iron substrate from corrosion in aggressive and variable soil conditions — from the acidic soils of the Highveld to the saline groundwater of coastal installations — as well as in treated water with chlorine or chloramine residuals.

Stainless Steel Internals — Reliable Long-Term Operation

SS420/SS431 stainless steel stem with precision-rolled trapezoidal threads. Bronze stem nut for self-lubricating, low-friction operation. Stainless steel A2-70 fasteners throughout. In water service — where valves may remain in one position for extended periods — non-stainless internals can rust and seize. The Model 1041's stainless and bronze internal components ensure the valve remains operable when called upon, without forcing, lubricant, or replacement.