Ductile Iron Gate Valve
Ductile iron gate valve is a type of gate valve that is constructed from ductile iron, a material known for its strength, ductility, and resistance to corrosion.
Ductile iron gate valve is a popular valve for water pipe, For example urban water supply, sewage treatment, industrial water supply, agricultural irrigation ,fire fighting water pipeline etc.
TECHNICAL
Design manufacture conforms to DIN EN1171, EN1074-2
Face to face dimension conforms to series 14 of BS EN558-1
Flange drilled conforms to BS EN1092
USE
Nominal Pressure 1.0Mpa
Suitable medium Water
Test pressure Shell 1.5Mpa
Seat 1.1Mpa
DRAWING
MATERIAL LIST
| No. | Name of part | Material |
|---|---|---|
| 1 | Body seat ring | Cast bronze |
| 2 | Body | Cast iron |
| 3 | Wedge seat ring | Cast brass |
| 4 | Stem | Stainless steel |
| 5 | Wedge | Cast iron |
| 6 | Stem nut | Cast brass |
| 7 | Bolt | Steel |
| 8 | Nut | Steel |
| 9 | Gasket | Graphite |
| 10 | Bonnet | Cast iron |
| 11 | Stuffing box gasket | Rubber graphite |
| 12 | Stuffing box | Ductile iron |
| 13 | Double screw bolt | Steel |
| 14 | Nut | Steel |
| 15 | O-ring | NBR |
| 16 | Handwheel | Cast iron |
| 17 | Washer | Steel |
| 18 | Bolt | Steel |
DIMENSIONS(mm)
| Size | L | D | D1 | D2 | B | f | n-d | DO | H |
|---|---|---|---|---|---|---|---|---|---|
| 40 | 140 | 150 | 110 | 84 | 18 | 3 | 4-19 | 130 | 194 |
| 50 | 150 | 165 | 125 | 99 | 20 | 3 | 4-19 | 130 | 204 |
| 65 | 170 | 185 | 145 | 118 | 20 | 3 | 4-19 | 130 | 226 |
| 80 | 180 | 200 | 160 | 132 | 22 | 3 | 8-19 | 150 | 254 |
| 100 | 190 | 220 | 180 | 156 | 24 | 3 | 8-19 | 185 | 295 |
| 125 | 200 | 250 | 210 | 184 | 26 | 3 | 8-19 | 185 | 351 |
| 150 | 210 | 285 | 240 | 211 | 26 | 3 | 8-23 | 195 | 413 |
| 200 | 230 | 340 | 295 | 266 | 26 | 3 | 8-23 | 225 | 498 |
| 250 | 250 | 395 | 350 | 319 | 28 | 3 | 12-23 | 245 | 579 |
| 300 | 270 | 445 | 400 | 370 | 28 | 4 | 12-23 | 285 | 679 |
Larger size is also available until DN2000.
Ductile Iron Gate Valve Application
Common Scenarios and Differences of Ductile Iron Gate Valve for Water Transportation Pipeline
Urban water supply
Features and requirements: Ensure water quality safety, long service life, and reliable operation.
Valve features:Sealing type: Soft Sealing;Surface treatment: FBE coating with WRAS certification to ensure that it is not harmful to the human body.Application: Drinking water system, residential area water supply network.
Sewage treatment
Features and requirements: Corrosion resistance, wear resistance, able to handle water containing impurities.
Valve features:Sealing type: Metal Sealing or Soft Sealing based on specific requirements;Surface treatment: Corrosion-resistant coating, such as epoxy coating;Application: Urban sewage pipeline, industrial wastewater treatment system.
Industrial water supply
Features and requirements: Need to withstand high pressure, strong durability, and convenient operation.
Valve features:Sealing type: Metal Sealing or Soft Sealing based on specific working conditions;Surface treatment: Anti-rust coating, such as epoxy coating;Application: Factory water supply pipeline, cooling water circulation system.
Agricultural irrigation
Features and requirements: Low cost, strong durability, easy operation.
Valve features:Sealing type: Soft Sealing , Surface treatment: Basic anti-rust coating;Application: Agricultural irrigation pipeline, irrigation system branch pipe network.
Fire fighting water
Features and requirements: High reliability, quick operation, high pressure resistance.
Valve features:Sealing type: Soft Sealing ;Surface treatment: High-quality anti-rust coating, such as epoxy coating;Application: Fire water supply pipeline, fire water tank system.
In these scenarios, different applications have different requirements for the valve’s sealing type and surface treatment to ensure safety and reliability under specific usage conditions. For example, a drinking water system requires the use of soft sealing valves with FBE coating with WRAS certification to ensure that it is not harmful to the human body; while the sewage treatment system focuses more on the corrosion resistance and wear resistance of the valve.
Cast Iron Gate Valve
Cast iron gate valves include ductile iron gate valves and grey cast iron gate valves. The differences between the two are as follows:
Material composition
Ductile Iron Gate Valve:
Material: Ductile iron with high tensile strength and toughness.
Structure: Graphite is in a spherical form, making it more robust and durable.
Grey Cast Iron Gate Valve:
Material: Grey cast iron with high compressive strength and wear resistance.
Structure: Graphite is in flake form, giving it good castability and thermal conductivity.
Mechanical performance
Ductile Iron Gate Valve:
Tensile strength: High (usually above 60,000 psi)
Ductility: Good, with high elongation and impact toughness.
Corrosion resistance: Good for applications requiring high strength and toughness.
Grey Cast Iron Gate Valve:
Tensile strength: Relatively low (usually around 20,000 psi)
Ductility: Poor, with high brittleness and easy fracture.
Corrosion resistance: Fair for applications requiring high compressive strength but not high ductility.
Application scenarios
Ductile Iron Gate Valve:
Applications: Widely used in water supply, sewage treatment, industrial water, and fire water systems.
Typical applications: Urban water supply pipelines, sewage treatment systems, industrial pipelines, fire systems.
Grey Cast Iron Gate Valve:
Applications: Primarily used in static or low stress environments such as low-pressure water supply systems, agricultural irrigation, etc.
Typical applications: Agricultural irrigation pipelines, low-pressure water supply systems.
Cost
Ductile Iron Gate Valve:
Cost: Higher, but lower long-term use cost due to superior mechanical performance and durability.
Grey Cast Iron Gate Valve:
Cost: Lower, suitable for budget-limited and non-performance critical applications.
Service life
Ductile Iron Gate Valve: Longer service life due to superior mechanical performance and corrosion resistance.
Grey Cast Iron Gate Valve: Relatively shorter service life due to brittleness and poor ductility in harsh environments.
In summary, Ductile Iron Gate Valve and Grey Cast Iron Gate Valve differ in material characteristics, mechanical performance, application scenarios, cost, and service life. Choose the appropriate type of valve based on specific application needs to effectively improve system operational reliability and economy.
Cast Iron Gate Valve VS Steel Gate Valve
The Differences and Applications of Cast Iron Gate Valve vs. Steel Gate Valve
Detailed differences
Material composition
Cast Iron Gate Valve:
Materials: Include ductile iron and grey cast iron.
Characteristics: Cast iron has good castability, good wear resistance, but low toughness and strength.
Steel Gate Valve:
Materials: Include carbon steel, stainless steel, etc.
Characteristics: Steel has high strength, high toughness, high temperature resistance, and corrosion resistance, suitable for harsher conditions.
Mechanical performance
Cast Iron Gate Valve:
Strength: Low, suitable for medium and low-pressure environments.
Corrosion resistance: Fair, depending on the surface treatment.
Steel Gate Valve:
Strength: High, suitable for high-pressure and high-temperature environments.
Corrosion resistance: Excellent, especially for stainless steel materials.
Temperature resistance
Cast Iron Gate Valve: Poor temperature resistance, not suitable for high-temperature environments.
Steel Gate Valve: Good temperature resistance, can be used in high-temperature environments.
Pressure resistance
Cast Iron Gate Valve: Low pressure resistance, suitable for medium and low-pressure systems.
Steel Gate Valve: High pressure resistance, suitable for high-pressure systems.
Cost
Cast Iron Gate Valve: Lower cost, suitable for projects with limited budgets.
Steel Gate Valve: Higher cost but excellent performance, suitable for projects that require high reliability.
Suggested choices for common pipelines
Water pipelines
Recommended valve: Ductile Iron Gate Valve or Steel Gate Valve
Reason:
Ductile Iron Gate Valve: Suitable for medium and low-pressure water pipelines like urban water supply and agricultural irrigation with lower cost.
Steel Gate Valve: Suitable for water treatment systems that require high reliability and corrosion resistance, especially in chemical-laden water treatments.
Oil pipelines
Recommended valve: Steel Gate Valve
Reason:
Steel Gate Valve: Has high strength and corrosion resistance, can withstand high-pressure and high-temperature environments, suitable for harsh conditions that may exist in oil pipelines.
Gas pipelines
Recommended valve: Steel Gate Valve
Reason:
Steel Gate Valve: Suitable for high-pressure gas pipelines, with excellent sealing performance and pressure resistance, ensuring the safety and reliability of gas transportation.
Sewage treatment pipelines
Recommended valve: Ductile Iron Gate Valve or Steel Gate Valve
Reason:
Ductile Iron Gate Valve: Suitable for general sewage treatment systems, with good corrosion resistance.
Steel Gate Valve: Suitable for sewage treatment systems containing chemicals or operating under harsh conditions.
Summary
The choice of the right gate valve type depends on specific application environment, pressure, temperature, corrosiveness, etc. Cast iron gate valves are suitable for medium with low-pressure, non-harsh environments with lower costs, while steel gate valves are suitable for high-pressure, high-temperature, corrosive environments with better performance but higher costs. Choosing the right gate valve based on the type of pipeline and operating conditions can ensure the safety, reliability, and economy of the system.
Water Gate Valve Types
Types and Characteristics of Water Gate Valves
Characteristics:Sealed with elastic materials (such as rubber) to ensure sealing performance.Suitable for non-corrosive or weakly corrosive media.Easy to maintain and replace seals.
Applications:Urban water supply systems,Agricultural irrigation,Sewage treatment systems
Characteristics:Sealed with metal-to-metal seal, reliable sealing, high-temperature and high-pressure resistance.Suitable for highly corrosive or high-temperature and high-pressure media.Long service life, but slightly inferior in sealing performance compared to soft sealing.service life, but slightly inferior in sealing per
Applications:Industrial water systems,High-temperature and high-pressure pipelines,Corrosive media pipelines
Wedge Gate Valve
Characteristics:The valve disc is wedge-shaped and has self-locking when closed to prevent loosening caused by vibration.Good sealing performance, suitable for systems that require strict sealing.Simple structure, easy operation.
Applications:High-pressure water supply systems,Sewage treatment systems,Industrial pipelines such as petroleum and chemicals
Parallel Double Disc Gate Valve
Characteristics:Uses a parallel double disc structure with reliable sealing.Suitable for media containing suspended matter or particles.Low friction when opening and closing, prolonging the life of the valve.
Applications:Sewage treatment systems,Industrial wastewater treatment,Pipelines containing particulate media
Buried Gate Valve
Characteristics:Designed for underground embedded installation, saving surface space.Good sealing performance, suitable for harsh environments.Easy for remote operation and maintenance.
Applications:Urban water supply pipelines,Agricultural irrigation systems,Underground water treatment systems
Characteristics:The valve stem rises and falls with the opening and closing of the valve, making it easy to observe the open and closed status of the valve.Reliable sealing, suitable for medium and high-pressure systems.Easy maintenance, suitable for frequent operation.
Applications:Urban water supply systems,Industrial water pipelines,Fire water systems
Characteristics:The valve stem does not rise or fall, suitable for spaces with limited space.
Compact structure, easy installation.Suitable for buried installation but not convenient for observing the open and closed status.
Applications:Underground water supply pipelines,Agricultural irrigation,Industrial water treatment systems
Electric Actuated Gate Valve
Characteristics:Uses an electric actuator for remote control and automated operation.Simple operation, suitable for systems that require frequent adjustments.Strong adaptability, can be used for various media.
Applications:Automated urban water supply systems,Automated industrial water treatment systems,Automated fire systems
Manual Gate Valve
Characteristics:The valve is opened or closed by manual operation, simple and reliable.Suitable for small pipelines or systems that do not require frequent operation.Low maintenance costs and long service life.
Applications:Small water supply pipelines,Agricultural irrigation systems,General industrial pipeline systems
Summary
There are various types of water gate valves, and choosing the right type of water gate valve depends on specific application scenarios, media characteristics, operational requirements, etc. Common water gate valves include resilient seated gate valves, metal seated gate valves, wedge gate valves, parallel double disc gate valves, buried gate valves, rising stem gate valves, non-rising stem gate valves, electric actuated gate valves, and manual gate valves. According to different application requirements, choosing the appropriate gate valve type can ensure the efficient, safe, and reliable operation of the system.
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