NRS Metal-Seated Gate Valve
NRS Metal-Seated Gate Valve - Image 2

NRS Metal-Seated Gate Valve

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Description

British Standard Metal-Seated Flanged Gate Valve Technical Data Sheet

Product Name: British Standard Non-Rising Stem Flanged Gate Valve
Series/Model: Z45W / BS 5163 Type (Metal Seated)
Connection: Flanged Ends
Type: Non-Rising Stem (NRS) / Inside Screw
Seat Material: Bronze (Seat surface faced with Bronze alloy)
Body Material: Cast Iron / Grey Iron

1. Application & Media

This valve is designed for isolating or connecting media in pipelines. It is suitable for water, sewage, seawater, oil, and non-corrosive gases. Due to the bronze-to-bronze metal seat, it offers better temperature and wear resistance compared to soft-seal valves, making it ideal for applications requiring metallic sealing surfaces.

2. Design & Compliance Standards

Item Standard / Code Description
Design & Manufacture BS 5163 / EN 1074 Specification for gate valves used in water supply systems
Flange Dimensions BS EN 1092-2 Flanges for cast iron pipes and fittings
Face-to-Face Length EN 558-1 / BS 5163 Installation dimensions for flanged valves
Pressure Testing EN 12266-1 / ISO 5208 Valve leakage and pressure test standards
Top Flange ISO 5210 Standard for actuator mounting (optional)

3. Main Technical Parameters

Parameter Unit Value
Nominal Diameter (DN) mm DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300, DN350, DN400, DN450, DN500, DN600
Nominal Pressure (PN) Bar PN10 / PN16 / PN25
Working Pressure – Max allowable pressure decreases as temperature increases (Refer to Pressure-Temperature rating chart)
Shell Hydrostatic Test Bar 1.5 x PN (e.g., For PN16: 24 Bar)
Seal Test Pressure Bar 1.1 x PN (e.g., For PN16: 17.6 Bar)
Working Temperature ℃ -10°C to +120°C (Subject to pressure rating and material limits)
Operation Type – Handwheel (Standard), Bevel Gear, Electric Actuator, Pneumatic Actuator

4. Main Component Materials

Part Name Material Notes / Standard
Body Cast Iron Grade: HT250 / EN-GJL-250 (Equivalent to BS 1452)
Bonnet Cast Iron Grade: HT250 / EN-GJL-250
Wedge (Gate) Cast Iron + Bronze Faced Bronze alloy (e.g., Aluminum Bronze / Tin Bronze) deposited or welded on the seat area
Seat Ring Bronze / Brass Integral seat ring deposited on the body or welded bronze ring
Stem Stainless Steel Grade: 2Cr13 / AISI 304 / AISI 316 (Prevents rust and seizing)
Stem Nut High-strength Brass Located inside the wedge for Non-Rising Stem operation
Packing Graphite / PTFE Provides reliable stem sealing to prevent external leakage
Handwheel Ductile Iron / Steel Epoxy coated

5. Main Dimensions & Connection Data (PN16)

Note: Dimensions are for reference only. Please verify with the manufacturer’s final drawing before installation.

DN (mm) Length L (mm) Flange Dia. D (mm) Bolt Circle D1 (mm) No. of Bolts n Bolt Hole Dia. d (mm) Total Height H (approx.) (mm) Handwheel Dia. Do (approx.) (mm)
50 150 165 125 4 19 ___ ___
65 170 185 145 4 19 ___ ___
80 180 200 160 8 19 ___ ___
100 190 220 180 8 19 ___ ___
125 200 250 210 8 19 ___ ___
150 210 285 240 8 23 475 280
200 230 340 295 12 23 540 360
250 250 395 350 12 23 630 360
300 270 445 400 12 23 780 400
350 290 505 460 16 23 885 400
400 310 565 515 16 26 990 400

6. Product Features

  1. Metal-to-Metal Seating: The wedge and seat are faced with a Bronze alloy, ground and lapped to ensure a reliable, wear-resistant seal suitable for higher temperatures and fluids with some impurities.

  2. Non-Rising Stem (NRS): The stem is threaded inside the valve and does not rise when the valve is operated. This design is ideal for spaces with limited vertical clearance or underground installation, as the handwheel height remains constant.

  3. Full Bore Design: The straight-through flow path minimizes fluid resistance and prevents sediment accumulation.

  4. Blow-Out Proof Stem: The stem features a T-head or shoulder at the bottom, preventing it from being ejected by internal pressure, allowing for safe packing replacement under pressure.

  5. Anti-Corrosion Coating: Internal and external surfaces are typically coated with non-toxic epoxy powder to prevent corrosion, making it suitable for potable water systems.

7. Ordering Information

To ensure the correct valve is supplied, please provide the following specifications when ordering:

  1. Product Name and Model.

  2. Nominal Diameter (DN).

  3. Nominal Pressure (PN).

  4. Body Material (Cast Iron) and Seat Material (Bronze).

  5. Media Type and Working Temperature.

  6. Quantity and any special requirements (e.g., special length, special coating, gearbox).

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