DI Flange Y-Type Strainer Ductile Cast Iron Flange Y Type Strainer Filter Valve

Product Attribute: port size:DN50-DN200
structure:y-type filter
application:General
place of origin: China
power:Hydraulic
temperature of media:Normal
brand name:TIANYU
media:gas,water,chemical
Product name:Y Type Strainer
Body material:Ductile Cast Iron
Connection:Flange Ends
Medium:Water Oil Gas Steam
Working pressure:PN10 PN16 PN25

INFO@TYFLUIDGROUP.COM

Specification

I. Product Overview

TIANYU ductile iron flanges are pipeline connection components made from ductile iron (GGG40/50), certified to international standards such as ISO 2531 and ASME B16.5. Available in various types including slip-on, weld-neck, and blind flanges, they cover nominal diameters from DN10 to DN2000 and can withstand working pressures up to 40 MPa. These flanges are suitable for connecting pipelines carrying water, steam, oil, and other media, and are widely used in water supply, petrochemical, and power industries.

II. Key Attribute Parameters

1. Structure & Specifications

Nominal Diameter Range: DN10–DN2000 (1/2″–80″)
Connection Types: Slip-on (SO), weld-neck (WN), blind (BL), threaded (TH), socket-weld (SW)
Flange Standards: ANSI B16.5, DIN 2501, JIS B2220, GB/T 9112
Materials: Ductile iron GGG40/50 (EN-GJS-400-15/EN-GJS-500-7), optional carbon steel or stainless steel

2. Performance Parameters

Tensile Strength: GGG40 ≥400 MPa, GGG50 ≥500 MPa
Yield Strength: GGG40 ≥250 MPa, GGG50 ≥320 MPa
Elongation: GGG40 ≥15%, GGG50 ≥7%
Hardness: 130–180 HBW (GGG40), 170–230 HBW (GGG50)

3. Pressure Ratings

Class Standards: Class 150 (2.0 MPa), Class 300 (5.0 MPa), Class 600 (10.0 MPa)
PN Standards: PN6 (0.6 MPa), PN10 (1.0 MPa), PN16 (1.6 MPa), PN25 (2.5 MPa), PN40 (4.0 MPa)

Product Overview

III. Structural Design & Technical Features

1. Spheroidal Graphite Structure

Graphite Morphological presentation spherical shape (spheroidization rate ≥90%), significantly improving material toughness and impact resistance
Matrix structure is ferrite + pearlite, ratio adjustable based on application (e.g., ferrite ≥85% for low-temperature environments)

2. Sealing Reliability Design

Sealing surface machining accuracy Ra ≤1.6 μm, flatness ≤0.05 mm
Tongue-and-groove (TG) or male-and-female (MF) designs provide dual sealing protection, leakage rate ≤10⁻⁹ m³/s·Pa

3. Corrosion-Resistant Coating

Epoxy resin coating (thickness ≥200 μm), salt spray resistance 1000 hours (ASTM B117)
Optional PTFE coating for weak acid/alkali environments (pH 4–10)

IV. Manufacturing Process & Quality Control

1. Core Processes

Melting Process:
- Medium-frequency electric furnace melting, molten iron purity ≤0.03% (S, P content)
- Spheroidization treatment using the sandwich method, rare-earth magnesium alloy spheroidizer addition 1.8–2.2%
Forming Process:
- Sand casting (resin sand/green sand), dimensional accuracy CT7–8
- Critical dimension tolerance ≤±0.5 mm (DN ≤500)

2. Quality Inspection

Metallographic Analysis: Graphite spheroidization rate ≥90%, nodule size 5–8 (ASTM A247)
Ultrasonic Testing: Grade I compliance per GB/T 7233.1–2019
Pressure Testing: 1.5x rated pressure hydrostatic test (5-minute hold with no leakage)

Valve Details

V. Core Product Advantages

Advantage	Technical Details & Application Value
High Strength	50% higher tensile strength than gray cast iron, suitable for high-pressure pipelines (e.g., PN40 steam lines).
Cost-Effectiveness	30% lower cost than carbon steel flanges, 15% lighter weight, reducing transportation and installation costs.
Machinability	Better cutting performance than carbon steel, 25% higher machining efficiency, thread accuracy up to class 6H.
Fatigue Resistance	Fatigue life ≥1 million cycles under alternating loads, 10x longer than gray cast iron.

Application

VI. Application Fields & Case Studies

1. Water Supply & Drainage Engineering

Scenario: Connection of DN600 main pipeline in municipal water supply
Configuration: PN16 slip-on flange, GGG40 material + epoxy coating
Result: Resistant to soil corrosion (pH 6–8), service life ≥50 years

2. Petrochemical Industry

Scenario: Steam pipeline in refinery (200°C, 1.6 MPa)
Configuration: Class 300 weld-neck flange, GGG50 material + high-temperature oxidation-resistant coating
Advantage: Maintains ≥90% strength at high temperatures, excellent creep resistance

3. Power Industry

Scenario: Circulating water system in thermal power plant (DN1200)
Configuration: PN10 large-diameter slip-on flange, GGG40 material + rubber gasket
Feature: Low elastic modulus (160 GPa), better vibration damping than carbon steel flanges

VII. Selection & Installation Guide

1. Key Selection Parameters

Medium Characteristics: Temperature, pressure, corrosiveness (e.g., Cl⁻ content ≤200 ppm)
Flange Type:
- Weld-neck flanges (WN) for vibrating applications, reducing stress concentration by 40%
- Lap-joint flanges (LJ) for frequently disassembled sections, improving maintenance efficiency by 50%
Sealing Surface Type: RF for water/steam; FF for acids/alkalis

2. Installation Notes

Apply bolt preload uniformly, tightening in 3 passes diagonally, preload deviation ≤±8%
Select gasket material compatible with the medium (e.g., NBR for water, PTFE for acids)
Post-weld stress relief treatment (600–650°C) required for large-diameter flanges (DN ≥800)