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

DIN Metal Seated NRS Gate Valve

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Description

Technical Data Sheet

German Standard Non-Rising Stem Bronze Seated Gate Valve (Cast Iron Body & Wedge, Bronze Seat Rings)

1. Product Overview

Product Name: German Standard Non-Rising Stem Bronze Seated Gate Valve
Model/Type: Z45T-10 / Z45T-16 / 315/317 Series
Valve Type: Non-Rising Stem (NRS) Solid Wedge Gate Valve
Structure: Bolted Bonnet, Non-Rising Stem, Solid Wedge
Seat Material: Cast Iron Body & Wedge with Bronze Seat Rings (Iron Body, Bronze Seated)
Connection: Flanged Ends
Application: Designed for isolating media flow in piping systems handling water, steam, oil, and other non-corrosive fluids. The non-rising stem design is ideal for installations with limited vertical space, such as valve pits and underground chambers.

2. Design & Compliance Standards

  • Design & Manufacture: BS 5150 / DIN 3352

  • Face-to-Face Dimension: EN 558-1 (Series 14 – Short Pattern) / DIN 3202-F4

  • Flange Drilling Standard: EN 1092-2 / DIN 2532 (PN10) / DIN 2533 (PN16) – Raised Face or Flat Face

  • Pressure Rating: PN10 / PN16

  • Inspection & Testing: EN 12266-1 / DIN 3230

3. Basic Technical Specifications

Parameter Specification
Nominal Diameter DN40 ~ DN600 (1½” ~ 24″)
Nominal Pressure PN10 / PN16
Shell Test Pressure 1.5 × PN (PN10 = 15 bar, PN16 = 24 bar)
Seal Test Pressure 1.1 × PN (PN10 = 11 bar, PN16 = 17.6 bar)
Operating Temperature -10°C ~ +120°C (Depending on media)
Suitable Media Fresh water, raw water, seawater, sewage, steam, oil, and other neutral media
Operation Type Handwheel or Square Nut

4. Main Component Materials

Component Material Remarks
Body Grey Cast Iron / Ductile Iron (GG20/25 / HT200) EN-GJL-200/250
Bonnet Grey Cast Iron / Ductile Iron (GG20/25 / HT200) Bolted bonnet design for easy maintenance
Wedge (Gate) Grey Cast Iron / Ductile Iron Solid wedge, rigid single gate design
Seat Rings Cast Aluminum Bronze / Aluminum Bronze (CuAl9Mn2 / CuZn40Pb2) Bronze seating surfaces are either welded or inserted on both body and wedge
Stem Chrome Stainless Steel / Aluminum Bronze 2Cr13 / AISI 420 or Bronze material
Stem Nut High-Strength Brass / Cast Aluminum Bronze Located at the top of the wedge
Packing Oil-Impregnated Asbestos / Graphite Packing / O-Rings
Fasteners Carbon Steel Zinc Plated / Stainless Steel Stud bolts or hex bolts
Handwheel Grey Cast Iron / Malleable Iron Painted finish

5. Dimension Table (Reference – PN10/16)

*Note: The following dimensions are typical values based on DIN 3202-F4 / EN 558-1 Series 14 face-to-face lengths and DIN flange standards. Please refer to the manufacturer’s certified drawing for exact dimensions.*

DN (mm) Length L (mm) Flange Dia. D (mm) Bolt Circle Dia. D1 (mm) Bolt Holes (Qty – Dia.) Height H (approx. mm)
40 200 150 110 4-Φ18 170
50 230 165 125 4-Φ18 285
65 290 185 145 4-Φ18 305
80 310 200 160 8-Φ18 330
100 350 220 180 8-Φ18 405
125 400 250 210 8-Φ18 460
150 480 285 240 8-Φ23 506
200 600 340 295 8/12-Φ23 610
250 730 395 350 12-Φ23 730
300 850 445 400 12-Φ23 950

6. Features & Product Advantages

  1. Bronze Seated Design: The sealing surfaces on both the body and wedge are made of bronze (cast aluminum bronze). This provides excellent corrosion resistance, wear resistance, and anti-galling properties. The combination of cast iron and bronze forms an ideal metal-to-metal sealing pair, ensuring a long service life.

  2. Non-Rising Stem (NRS) Construction: The stem nut is located inside the wedge. During operation, the stem only rotates without rising. Therefore, the overall height of the valve remains constant, requiring minimal installation space. This is particularly suitable for confined spaces like valve pits or underground pipelines.

  3. Cast Iron Body & Wedge: The body and gate are constructed from high-strength grey or ductile cast iron, offering good strength, natural corrosion resistance, and cost-effectiveness. The ductile iron option provides enhanced mechanical properties and impact resistance.

  4. Full Bore Design: The straight-through flow path ensures minimal pressure drop and low flow resistance. It also allows for easy pipeline cleaning using pigs or scrapers.

  5. Bolted Bonnet: The bonnet is secured with bolts, allowing for easy disassembly, inspection, and maintenance of internal components without removing the valve from the pipeline.

  6. German Standard Flanges: Flanges are designed and drilled according to DIN/EN standards. The flat face design is compatible with various gasket types and ensures easy installation.

7. Inspection & Testing

  • Shell Hydrostatic Test: 1.5 x Rated Pressure at ambient temperature, held for the duration per EN 12266-1, with no visible leakage.

  • Seat Leakage Test: 1.1 x Rated Pressure at ambient temperature. Leakage is tested in one or both directions (depending on requirements) and must conform to DIN 3230 standards.

  • Visual Inspection: Casting surfaces must be clean, free from cracks, porosity, slag inclusions, and other defects. The internal/external coating must be uniform and adherent.

  • Marking: The body must be clearly marked with the pressure rating, nominal diameter, material designation, and flow direction arrow (if applicable).

8. Selection & Application Guidelines

  1. Installation: While gate valves are typically bidirectional, it is recommended to install the valve according to the flow direction arrow on the body (if present) for optimal sealing performance.

  2. Operation: This valve is designed for fully open or fully closed service only. Do not use it for throttling or flow regulation, as this can erode the bronze seating surfaces and cause premature failure.

  3. Media Compatibility: Suitable for non-corrosive media such as clean water, sewage, seawater, steam, and oils. For highly corrosive media, stainless steel valves are recommended.

  4. Temperature Limits: Operating temperature should not exceed 120°C to prevent degradation of the mechanical properties of the cast iron and bronze sealing materials.

  5. Storage: For long-term storage, keep the valve in a slightly open position (approx. 5% open) to prevent the seat rings from being deformed under constant pressure. Store indoors in a dry environment to prevent rust and corrosion.

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