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Professional Brass Valve Manufacturer in China
Custom your brass valves with NAFCO
 
✓ Over 15 years manufacturing experience
✓ Custom based on your sample
✓ 100% testing to ensure quality
✓ 7/24 online support
 
As a professional producer of brass valves, NAFCO is an expert in manufacturing brass valves with trusted quality for more than 15 years. It can be applied for different applications like commercial or industrial. You can put trust in us since we are making brass valve products with the help of high-quality materials to ensure their safety. We are very much will willing to aid your brass valve needs. Just message us!
 
Our Best Selling Brass Valves

Brass Ball Valves
Brass Angle Valves
Brass Radiator Valves
 
Brass Gate Valves
Brass Check Valves
Brass Y Strainer Valve
 

Basic Information for Importing Brass Valves from China

1. Classification of brass valves

1. According to working pressure:
Low pressure: (nominal pressure) ≤1.6MPa
Medium pressure: (nominal pressure) 2.5~6.4MPa
High pressure: (nominal pressure) 10~80MPa
Ultra high pressure: (nominal pressure) ≥100MPa
NAFCO produces medium and low pressure brass valves;
The mark on the valve body is ten multiples of Mpa. Such as: PN10 nominal pressure is 1MPa

2. According to functions:
Brass ball valves, brass angle valves, brass safety valves, brass stop valves, brass check valves, brass filter valves, brass gate valves and brass heating valves. The products that are currently in demand on the market are brass ball valves, bibcocks, brass stop valves, brass angle valves, brass check valves and Y filter valves etc.

3. According to the working temperature:
Brass valves can be divided into:
1) Ultra-low temperature
2) Low temperature -100℃~ -40℃
3) Normal temperature -40℃~120℃ (all ball valves produced by NAFCO are within this temperature range)
4) Medium temperature 120℃~450℃
5) High temperature>450℃

4. According to the flow medium:
 Brass valves can be divided into water-pass brass valve, oil-pass brass valve and air-brass pass valve: we currently produce civil-use water brass valve and civil-use gas brass valves. The gas valves are generally EN331 certified.

5. According to the stem structures:
The brass ball valves can be divided into O-ring structure and packing gland structure:
1) O-ring structure: specifically refers to the seal on the stem is sealed with a black rubber seal; the advantage of this structure is that the assembly procedure at the stem is relatively simple; the cost is relatively small; the disadvantage is that it is not repairable and the use temperature range is low, easy to age.
 2) Packing gland structure: In particular, the valve stem seal is made of PTFE plastic seal; the advantages and disadvantages of this structure are opposite to the O-ring structure, and it is safer and can be applied to relatively high pressure environments.

6. According to the end connection:
Brass valves can be divided into:
1) Threaded connection:
2) Card sleeve type connection:
3) Flange connection:
4) Welding:
A: socket welding: the welding port of the ball valve is inserted into the pipe;
B: Butt welding: butt joint of the welding port of the ball valve and the port of the pipe
5) Clamping band connection:
brass gas ball valves China
Brass gate valves China
Classifications of brass valves

2. The functions and applications of brass valves

1). General function: The brass valve is a control component in the fluid delivery system.
2). Applications: The use of brass valves is extremely wide. Whether it is industry, agriculture, national defense, aerospace, or transportation, urban construction, people's life and other departments, a large number of various types of brass valves and the nominal name of brass valves are needed The diameter ranges from several mm instrument valves to 10 meter supply pipeline valves. The working pressure of brass valves can range from 1.3×10-3Mpa to 1000Mpa ultra-high pressure, and the working temperature is from -269 ℃ ultra low pressure to 143 ℃ high temperature. .

Specifically, brass valves have the following applications:
A: Connect or cut off the medium in the pipeline: such as brass gate valves, brass globe valves, brass ball valves, brass plug valves, diaphragm valves, butterfly valves, etc.
B: Adjust and control the flow and pressure of the medium in the pipeline: such as brass shut-off valves, brass regulating valves, pressure reducing valves, safety valves, etc.
C: Change the flow direction of the medium in the pipeline: such as brass distribution valve, brass three-way cock, three-way or four-way brass ball valve.
D: Prevent the back flow of the medium in the pipeline: such as brass check valves of different structures, brass foot valves, etc.
E: Separation medium: such as steam traps with different structures, air traps, brass filter valves, etc.
F: Indicate and adjust the liquid level: such as liquid level indicator, liquid level regulator, brass float valve, etc.
G: Other applications: such as temperature control valve, over current protection emergency shut-off valve, etc.
Among the above-mentioned various general brass valves, the valves used for switching on and off account for more than 80% of all brass valves.
The functions and applications of brass valves

3. The parts and materials of brass valve

1. Valve body: The material is brass, and the surface treatment includes nickel plating, chrome plating, natural color, and pickling. Nickel plating can be divided into dark nickel, matt nickel and bright nickel. Chrome plating is more expensive than nickel plating. Different countries and markets require different raw materials. We mainly use ordinary brass HPb57-3 CuZn39Pb3 (two elements Cu and Pb raw material control).

2. Valve ball: The material is brass, and the surface is chrome-plated. Generally, in order to save costs and facilitate the use of large-size products, solid balls are used for brass valves below φ39, hollow spheres above φ39, and flat-bottomed balls are generally used for solid balls to reduce weight. The surface roughness and roundness of the ball is one of the most important factors that directly affect the sealing performance of the ball valve.

3. PTFE seat: Also known as TEFLON, the chemical name is polytetrafluoroethylene.
1) Advantages: excellent chemical stability, no chemical effect with strong acid and strong alkali chemicals, high heat resistance and cold resistance, the use temperature is generally -20 to 130 ℃, and the coefficient of friction is very high. Low, it is a good self-lubricating material;
2) Disadvantages: low mechanical properties, poor rigidity, cold fluidity, low thermal conductivity, large thermal expansion, low wear resistance (if you need to increase wear resistance, you can add fillers, such as graphite, disulfide, aluminum Powder, glass fiber, etc., moderately improved);
3) Function: Mainly used as a chemical-resistant, high-temperature-resistant seal, such as packing, gasket, valve seat, etc.;

4. O-ring (rubber gasket): NBR --- China material code is 66B, which is divided into two types: 66B-1 and 66B-2.
We currently use O-rings whose hardness is generally 65; the greater the hardness, the better the wear resistance; but more than HA80, the greater the brittleness;

5. Valve stem: The valve stem is divided into O-ring structure stem and pressure cap structure stem. The O-ring structure valve stem is sealed with an O-ring, and the pressure cap structure valve stem is sealed with a packing. The valve stem of the pressure cap structure is divided into the top loading type and the bottom loading type.

6. Valve handle: 
A) From the perspective of color, the handle is divided into red, yellow, blue, green, white and black. Usually different colors indicate different media: red generally indicates a higher temperature medium; yellow indicates a gas medium (European countries), so the brass valve with a yellow handle is a gas valve; blue generally indicates a lower temperature medium; white generally indicates Cold air medium; black generally means oily medium. 
B) From the perspective of material, the handles are divided into aluminum handles, iron handles, plastic-bonded iron handles and nylon handles, and other plastic handles are ABS, POM, etc. 
C) According to the shape, it can be divided into round handle, stretch handle, butterfly handle and lock handle, single-word handle. The handle code of our factory is: LP means red round handle; ST means viscose handle; TG means yellow butterfly handle; T means butterfly aluminum handle; M means nylon handle; LK means lock handle.

7. Valve cap According to the shape, it can be divided into hexagonal cap and octagonal cap.
The parts of brass valve
The materials of brass valve
The parts and materials of brass valve

4. Some basic parameters of brass valves


The diameter of the brass valve is the size of the water hole, which can also be said to be the smallest hole. The threads of the same specification are arranged in the order of full diameter, standard diameter and reduced diameter according to the flow holes from large to small. There is a standard for the three different diameters of each specification of thread:
diameter of the brass valve

5. The production process of brass valves

1. Hot forging workshop: Use a cutting machine to cut the copper rod into various copper rods of varying lengths according to the brass demand of the product → put the required mold in the punch, and press (forge) the high-temperature heated copper rod. So as to get the blank → put the blank with flash into the punch and cut off the edges.

2. Sand blasting workshop: Put the cut edge blanks into the blasting machine and blast sand with different specifications of sand according to customer requirements. After sanding, the surface of the products should be inspected one by one, and if it is not, it should be repaired, selected, and scrapped.

3. Metalworking workshop: body: a. Drilling water hole b. Metric end c. Inch end d. Middle hole. To the cap: a. drilling water hole b. metric end c. inch end; drilling and threading machines include CNC machine tools, instrument lathes, and ordinary large lathes.

4: Outsourcing electroplating: nickel or chrome plating according to customer requirements.

5: Assembling and packaging workshop: the tested various accessories purchased from outsourcing will be transported to the assembly workshop and the valve body and bonnet produced by our factory will be assembled and packaged together.
The production process of brass valves

6. The main factors affecting the quality of brass valves

1. Machining size (body, cap seal depth, center hole center distance)
2. Valve ball (ellipse, deformation, burr, symmetry, etc., the burr is mainly electroplating burr)
3. PTFE seat: sizes, outer diameter, flashing, etc.
4. Handle: The valve body cannot be sealed if the horizontal angle is too high or not in place, and the square hole size is too large or too small to affect the sealing performance of the product.
5. Whether the glue is applied evenly: the size of the matching gap between the metric thread of the body cap, and the quality of the glue itself. If the glue on the nut is applied unevenly, it will cause the flat surface to leak.

7. The inspection focus of brass valves

1. Thread and thread length
2. Pressure test (air test 6-8kgf/cm2 = 6-8 Bar)
3. Weight and feel
4. Handle angle and surface
5. Dimensions after assembly
6. Starting torque
7. Rotation torque
8. Bonnet resistance
9. Tightening of the bonnet
10. Bonnet tightening breaking force
11. Handle endurance
12. Stem bearing force
Among them, the finished product inspection generally needs to do 1~5 inspections, and the 6-12 tests are type tests.
We randomly collect samples from each order production to do tests in our testing lab, to ensure every quality details are met.
The inspection focus of brass brass valves:

Looking for brass valve manufacturers in China?

Basic knowledge of brass valves helps you to understand the product better in terms of design, quality and costs, which is a critical part of purchasing brass valves, when selecting correct types of brass valves, sourcing brass valve manufacturers in China, or comparing quality and costs. You're welcome to contact us if you're looking for a brass valve manufacturer in China, we will offer you best quality brass valve products, optimized prices and excellent services.
brass gas ball valves China
Brass gate valves China
Classifications of brass valves

2. The functions and applications of brass valves

1). General function: The brass valve is a control component in the fluid delivery system.
2). Applications: The use of brass valves is extremely wide. Whether it is industry, agriculture, national defense, aerospace, or transportation, urban construction, people's life and other departments, a large number of various types of brass valves and the nominal name of brass valves are needed The diameter ranges from several mm instrument valves to 10 meter supply pipeline valves. The working pressure of brass valves can range from 1.3×10-3Mpa to 1000Mpa ultra-high pressure, and the working temperature is from -269 ℃ ultra low pressure to 143 ℃ high temperature. .

Specifically, brass valves have the following applications:
A: Connect or cut off the medium in the pipeline: such as brass gate valves, brass globe valves, brass ball valves, brass plug valves, diaphragm valves, butterfly valves, etc.
B: Adjust and control the flow and pressure of the medium in the pipeline: such as brass shut-off valves, brass regulating valves, pressure reducing valves, safety valves, etc.
C: Change the flow direction of the medium in the pipeline: such as brass distribution valve, brass three-way cock, three-way or four-way brass ball valve.
D: Prevent the back flow of the medium in the pipeline: such as brass check valves of different structures, brass foot valves, etc.
E: Separation medium: such as steam traps with different structures, air traps, brass filter valves, etc.
F: Indicate and adjust the liquid level: such as liquid level indicator, liquid level regulator, brass float valve, etc.
G: Other applications: such as temperature control valve, over current protection emergency shut-off valve, etc.
Among the above-mentioned various general brass valves, the valves used for switching on and off account for more than 80% of all brass valves.
The functions and applications of brass valves

3. The parts and materials of brass valve

1. Valve body: The material is brass, and the surface treatment includes nickel plating, chrome plating, natural color, and pickling. Nickel plating can be divided into dark nickel, matt nickel and bright nickel. Chrome plating is more expensive than nickel plating. Different countries and markets require different raw materials. We mainly use ordinary brass HPb57-3 CuZn39Pb3 (two elements Cu and Pb raw material control).

2. Valve ball: The material is brass, and the surface is chrome-plated. Generally, in order to save costs and facilitate the use of large-size products, solid balls are used for brass valves below φ39, hollow spheres above φ39, and flat-bottomed balls are generally used for solid balls to reduce weight. The surface roughness and roundness of the ball is one of the most important factors that directly affect the sealing performance of the ball valve.

3. PTFE seat: Also known as TEFLON, the chemical name is polytetrafluoroethylene.
1) Advantages: excellent chemical stability, no chemical effect with strong acid and strong alkali chemicals, high heat resistance and cold resistance, the use temperature is generally -20 to 130 ℃, and the coefficient of friction is very high. Low, it is a good self-lubricating material;
2) Disadvantages: low mechanical properties, poor rigidity, cold fluidity, low thermal conductivity, large thermal expansion, low wear resistance (if you need to increase wear resistance, you can add fillers, such as graphite, disulfide, aluminum Powder, glass fiber, etc., moderately improved);
3) Function: Mainly used as a chemical-resistant, high-temperature-resistant seal, such as packing, gasket, valve seat, etc.;

4. O-ring (rubber gasket): NBR --- China material code is 66B, which is divided into two types: 66B-1 and 66B-2.
We currently use O-rings whose hardness is generally 65; the greater the hardness, the better the wear resistance; but more than HA80, the greater the brittleness;

5. Valve stem: The valve stem is divided into O-ring structure stem and pressure cap structure stem. The O-ring structure valve stem is sealed with an O-ring, and the pressure cap structure valve stem is sealed with a packing. The valve stem of the pressure cap structure is divided into the top loading type and the bottom loading type.

6. Valve handle: 
A) From the perspective of color, the handle is divided into red, yellow, blue, green, white and black. Usually different colors indicate different media: red generally indicates a higher temperature medium; yellow indicates a gas medium (European countries), so the brass valve with a yellow handle is a gas valve; blue generally indicates a lower temperature medium; white generally indicates Cold air medium; black generally means oily medium. 
B) From the perspective of material, the handles are divided into aluminum handles, iron handles, plastic-bonded iron handles and nylon handles, and other plastic handles are ABS, POM, etc. 
C) According to the shape, it can be divided into round handle, stretch handle, butterfly handle and lock handle, single-word handle. The handle code of our factory is: LP means red round handle; ST means viscose handle; TG means yellow butterfly handle; T means butterfly aluminum handle; M means nylon handle; LK means lock handle.

7. Valve cap According to the shape, it can be divided into hexagonal cap and octagonal cap.
The parts of brass valve
The materials of brass valve
The parts and materials of brass valve

4. Some basic parameters of brass valves


The diameter of the brass valve is the size of the water hole, which can also be said to be the smallest hole. The threads of the same specification are arranged in the order of full diameter, standard diameter and reduced diameter according to the flow holes from large to small. There is a standard for the three different diameters of each specification of thread:
diameter of the brass valve

5. The production process of brass valves

1. Hot forging workshop: Use a cutting machine to cut the copper rod into various copper rods of varying lengths according to the brass demand of the product → put the required mold in the punch, and press (forge) the high-temperature heated copper rod. So as to get the blank → put the blank with flash into the punch and cut off the edges.

2. Sand blasting workshop: Put the cut edge blanks into the blasting machine and blast sand with different specifications of sand according to customer requirements. After sanding, the surface of the products should be inspected one by one, and if it is not, it should be repaired, selected, and scrapped.

3. Metalworking workshop: body: a. Drilling water hole b. Metric end c. Inch end d. Middle hole. To the cap: a. drilling water hole b. metric end c. inch end; drilling and threading machines include CNC machine tools, instrument lathes, and ordinary large lathes.

4: Outsourcing electroplating: nickel or chrome plating according to customer requirements.

5: Assembling and packaging workshop: the tested various accessories purchased from outsourcing will be transported to the assembly workshop and the valve body and bonnet produced by our factory will be assembled and packaged together.
The production process of brass valves

6. The main factors affecting the quality of brass valves

1. Machining size (body, cap seal depth, center hole center distance)
2. Valve ball (ellipse, deformation, burr, symmetry, etc., the burr is mainly electroplating burr)
3. PTFE seat: sizes, outer diameter, flashing, etc.
4. Handle: The valve body cannot be sealed if the horizontal angle is too high or not in place, and the square hole size is too large or too small to affect the sealing performance of the product.
5. Whether the glue is applied evenly: the size of the matching gap between the metric thread of the body cap, and the quality of the glue itself. If the glue on the nut is applied unevenly, it will cause the flat surface to leak.

7. The inspection focus of brass valves

1. Thread and thread length
2. Pressure test (air test 6-8kgf/cm2 = 6-8 Bar)
3. Weight and feel
4. Handle angle and surface
5. Dimensions after assembly
6. Starting torque
7. Rotation torque
8. Bonnet resistance
9. Tightening of the bonnet
10. Bonnet tightening breaking force
11. Handle endurance
12. Stem bearing force
Among them, the finished product inspection generally needs to do 1~5 inspections, and the 6-12 tests are type tests.
We randomly collect samples from each order production to do tests in our testing lab, to ensure every quality details are met.
The inspection focus of brass brass valves:

Looking for brass valve manufacturers in China?

Basic knowledge of brass valves helps you to understand the product better in terms of design, quality and costs, which is a critical part of purchasing brass valves, when selecting correct types of brass valves, sourcing brass valve manufacturers in China, or comparing quality and costs. You're welcome to contact us if you're looking for a brass valve manufacturer in China, we will offer you best quality brass valve products, optimized prices and excellent services.
Contact Us Now
China Brass Ball Valve Manufacturer & Supplier | NAFCO Brass Valve
No.555 Juxian Road, Hi-tech Zone, Ningbo, China 315000
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