China high quality Black/Hot Dipped Galvanized Malleable Cast Iron Fitting Reducer Socket/Coupling

Product Description

Product Description

HangZhou Jizhong Malleable Iron Co.,Ltd
A professional manufacturer of malleable iron pipe fittings since 1990.

Our main products are  malleable iron pipe fittings , the brand is “G”.  Others include  Grooved fittings and couplings, Buttweld fittings, Steel pipe nipples and couplings, Flanges and Stainless steel thread fittings . It is widely used in  fire protection, plumbing, oil, gas, infrastructure, construction and decoration  etc. The products has passed the UL&FM fire safety certification. The main markets include the United States, Canada, Australia, Latin America, South America, South Africa, the Philippines, Indonesia and Vietnam, Saudi Arabia and so on.

Material Black Heart Malleable Iron
Standard British Standard, American Standard, DIN standard
Chemical Property (C% 2.4-2.9), (Si%1.4-1.9), (Mn% 0.4-0.65), (P% <0.1), (S% <0.2)
Physical Property Tensile Strength>=300Mpa, Elongation>=6%, Hardness<=150HB
Testing Pressure 2.5Mpa Hydraulic Pressure
Working Pressure 1.6Mpa Hydraulic Pressure
Type Banded, Beaded, Plain
Surface Treatment Electro Galvanized, Hot Dipped Galvanized and Normal Black
Series Standard
Application Fire Fighting, Plumbing, Oil, Gas, Decoration, Infrastructure and Construction
Transportation mode By Sea, By Railway or By Air
Delivery  30-50 Days after Prepayment

Standard Details

Standard Details
  Materials Dimension Galvanized Threads
NPT ASTM A-197 ASME B16.3 16.14 ASTM A153 ANSI B1.20.1
ANSI/ASME/A197-79 ANSI/ASME B16.3-85   ANSI/ASME B1.20.1
BSPT ASTM A-197 BS EN 15712 ASTM A153 ISO 7/1
EN1562 BS 143&1256    
ISO5922 ISO49    
DIN ASTM A-197 DIN EN 15712 ASTM A153 ISO 7/1
EN1562 ISO49 ISO 1460 DIN 2999
ISO5922 DIN2950    
DIN 1692      

Detailed Photos


Package Detail

Certificate List

HangZhou Jizhong Malleable Co., Ltd. was established in 1990, nearly 30 years of production and sales experience, the company is located in HangZhou, the capital of ZheJiang Province, 300 kilometers away from ZheJiang , and same distance from the nearest port ZheJiang .
The company passed the ISO9001 management system certification and BV certification, the products passed the UL&FM fire safety certification. 
Innovation, development, harmony and CHINAMFG is the purpose of our company; professional, rationality is our sales creed. We are committed to being your trusted partner.



1.Are you a manufacturer?
Yes, our factory was set up in 1990.

2.How to confirm the goods quality before placing orders?
We have a perfect quality inspection system to ensure the quality of products.

3.Acceptable payment methods?
We can accept T/T, L/C, O/A, etc

4.How long will it take to deliver?
Generally 30-50 days delivery.

Look CHINAMFG to cooperating with you!

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reducer coupling

Can a Reducer Coupling be Threaded or Welded onto Pipes?

Yes, a reducer coupling can be either threaded or welded onto pipes, depending on the specific design and intended application. The two methods of connection offer different advantages and considerations:

  • Threaded Connection: Some reducer couplings come with threaded ends, allowing them to be easily screwed onto the pipe ends. This type of connection is convenient for systems that may need disassembly or reconfiguration in the future. Threaded couplings can be installed and removed without requiring specialized tools or welding equipment. However, it is essential to use thread sealants or Teflon tape to ensure a tight and leak-free connection.
  • Welded Connection: In some applications, it may be more appropriate to weld the reducer coupling onto the pipes. This method provides a permanent and robust connection that is well-suited for high-pressure or critical systems. Welded joints offer excellent strength and sealing, making them less prone to leaks compared to threaded connections. However, welding requires specialized skills and equipment, and the process can be more time-consuming and irreversible.

The choice between threaded and welded connections depends on various factors, including the system’s pressure and temperature requirements, the pipe material, and the level of permanence desired. Here are some considerations for each method:

  • Threaded Connection Considerations:
  • Quick and easy installation without the need for welding.
  • May be suitable for low to medium pressure systems.
  • Threaded joints may require periodic inspection and re-tightening to maintain their integrity.
  • Potential for leakage if not properly sealed or maintained.
  • Welded Connection Considerations:
  • Provides a permanent and reliable connection.
  • Well-suited for high-pressure and critical systems.
  • Minimal risk of leakage when welded correctly.
  • Requires skilled welders and proper welding equipment.
  • Difficult to disassemble or modify once welded.

When choosing between threaded and welded connections for a reducer coupling, it is crucial to consider the specific requirements of the system, as well as the available resources and expertise for installation. Consulting with qualified engineers or professionals can help determine the most suitable connection method for a given application.

reducer coupling

Potential Limitations or Drawbacks of Using a Reducer Coupling

While reducer couplings are commonly used and offer advantages in certain applications, they also have some limitations and drawbacks that should be considered:

  • Flow Restrictions: Reducer couplings may create flow restrictions due to the change in pipe diameter, which can lead to increased pressure drop and reduced flow rates in the system.
  • Pressure Loss: When fluid flows through a reducer coupling, there is a pressure loss associated with the change in diameter. This pressure loss can impact the overall system performance, especially in high-pressure applications.
  • Mechanical Stress: The transition from a larger to a smaller pipe diameter in a reducer coupling can cause mechanical stress and turbulence in the fluid flow, potentially leading to fatigue and premature wear in the system.
  • Corrosion and Material Compatibility: If the reducer coupling material is not compatible with the materials of the connected pipes, it can lead to galvanic corrosion and deterioration of the coupling, reducing its lifespan.
  • Space Considerations: Reducer couplings add length to the pipeline due to their tapered design, which may require more space for installation and can be a constraint in compact or crowded installations.
  • Thermal Expansion: Differences in thermal expansion coefficients between the pipe materials and the reducer coupling material can cause stress and potential leaks at the joints during temperature variations.
  • Flow Turbulence: The abrupt change in pipe diameter at the reducer coupling can induce flow turbulence, affecting the efficiency of the fluid transport system.
  • Cost: In some cases, using a reducer coupling may require additional material and labor costs for installation, especially when transitioning between pipes of significantly different diameters.
  • Disassembly Difficulty: In situations where maintenance or repairs are required, disassembling a reducer coupling can be more challenging compared to other types of pipe fittings, particularly if it is permanently welded or glued.
  • Limitation in Transitioning Pipe Materials: Reducer couplings may not be suitable for transitioning between pipes with vastly different materials due to potential corrosion or compatibility issues.

Despite these limitations, reducer couplings remain valuable components for connecting pipes of different diameters in plumbing and piping systems. It is essential to carefully consider the specific requirements and challenges of the application to determine whether a reducer coupling is the best choice or if other types of pipe fittings would be more suitable.

reducer coupling

What are the Standard Sizes and Dimensions of Reducer Couplings?

Reducer couplings come in a variety of standard sizes and dimensions to accommodate different pipe diameters. The sizes and dimensions of reducer couplings are typically specified in terms of the nominal pipe size (NPS) and the outside diameter (OD) of the pipe.

For example, a common type of reducer coupling is a “concentric reducer,” where the center axis of the two pipe ends remains in line. The standard sizes of concentric reducer couplings include:

  • 1/2″ x 1/4″ NPS
  • 3/4″ x 1/2″ NPS
  • 1″ x 3/4″ NPS
  • 1-1/4″ x 1″ NPS
  • 1-1/2″ x 1-1/4″ NPS
  • 2″ x 1-1/2″ NPS
  • 2-1/2″ x 2″ NPS
  • 3″ x 2-1/2″ NPS
  • 4″ x 3″ NPS
  • 6″ x 4″ NPS
  • 8″ x 6″ NPS
  • 10″ x 8″ NPS
  • 12″ x 10″ NPS

It’s important to note that the dimensions of the reducer coupling, including the overall length and the transition length, may vary depending on the specific manufacturer and industry standards. The dimensions of reducer couplings are designed to ensure a proper fit between pipes of different sizes, allowing for a smooth flow transition without abrupt changes that could lead to turbulence or pressure loss.

Additionally, reducer couplings are available in various materials, such as PVC, CPVC, stainless steel, brass, and copper, to suit the compatibility requirements of different pipe materials and applications.

Before selecting a reducer coupling for a specific application, it is crucial to consider the pipe sizes, material compatibility, pressure and temperature ratings, and the joining method to ensure a proper and secure fit for the plumbing or piping system.

China high quality Black/Hot Dipped Galvanized Malleable Cast Iron Fitting Reducer Socket/Coupling  China high quality Black/Hot Dipped Galvanized Malleable Cast Iron Fitting Reducer Socket/Coupling
editor by CX 2024-04-10






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