Brass Gate Valves

Forged Brass Gate Valve

Best-seller model, forged valve body, solid construction
Forged Brass Gate Valve



Forged Brass Gate Valve ART.N10131004 is our best seller gate valve, mainly used for the circulation and cutting of pipeline media such as water, steam, gas and oil, flow and pressure adjustment, and flow direction change, etc.

• Sizes: 1/2" to 2" (DN15 to DN50)
• Working pressure: PN16  / 200WOG
• Working temperature: -10 to 120℃
• Standard bore design
• Sandblasted and rough valve body
• BSP or NPT threads available
• Customized production acceptable
• Materials: CW617N, HPb57-3, C37700, DZR

• 100% leakage test for each valve
• Anti-blow-out stem design
• Suitable for a full range of liquids
• Easy and swift to open and close
• Flow can go either direction
Parts Material
Body Brass
Cap Brass
Stem Brass
Seal NBR or Silicon
Disc Brass
Hand-wheel Cast Iron
Handle nutBrass

The design of forged brass gate valve

Brass valves are mainly used to circulate and cut off pipeline media such as water, steam, gas and oil, adjust flow and pressure, and change the flow direction. Brass valves are high-end products among valves, mostly for civilian use. 
The valve body is the main part and most important for brass gate valve function, and the gate valve body is the most complex structure among many types of valves.

The advantage of forged brass gate valves                                                                  
The valve body is the main part and important part of forged brass gate valve, and the gate valve body is the most complex structure among many types of valves, especially the large-size gate valve body. Its processing technology has always been machined after turning sand or die-casting blanks. Foundry and die-casting blanks have many quality problems, such as trachoma, pores, cracks, etc., and have poor mechanical properties. The red forging process is used instead, which not only greatly improves the quality of the blanks, but also improves working conditions and saves materials and energy.

Overview of forging process of brass gate valves

Red forging  is also called hot forging. In the brass gate valve manufacturing industry, everyone is more accustomed to the name "red forging", which is a hot extrusion process that performs less and no cutting on metal materials. After the brass material is heated to a certain temperature, it is plastically deformed in the cavity of the red forging die under the pressure of the reciprocating movement of the stamping equipment to form a blank of the required shape and size. Under normal circumstances, it can be done at one time, and can perform brass gate valve body multi-directional de-molding action at one time.
Selection of brass material for forged brass gate valves                                            
Different from the previous method of controlling the composition ratio in the brass material smelting used in foundry and casting, the red punch can directly use ordinary round bar materials, and the blanks with large deformation variables can also be used in special-shaped materials for better molding effects. There are three types of brass rods for brass gate valve: continuous casting rods, hot-rolled rods and extruded rods. Among them, the extruded rods have the best performance and relatively high cost; the continuous casting rods have low density relative to copper and have grain gaps, but they have advantages in price. After continuous practice, the brass bar grades that can be used for red forging have a wide range of grades. The copper content is generally required to be higher than 55%, otherwise the plasticity and forgeability of the raw material will be reduced, and the plasticity and mechanical properties of the formed blank will drop sharply, which will easily cause cracks and fractures. Containing less than 3.5% lead in the bar material is conducive to the improvement of the cutting performance of the valve body blank in the next step of gold processing. In lead-free or less-lead bar materials, the substitution of elements such as silicon and bismuth will be adopted to increase the cutting performance. If the lead content exceeds 3.5%, the plasticity and mechanical properties of the formed blank will also decrease. Generally, it contains a small amount of aluminum, which will help improve the fluidity of the material. However, if the content of aluminum is higher than 0.35%, the red stamping parts of the forged brass gate valve body will be easily brittle, and even cracks will occur during the installation and use of the valve. The most widely used and superior grades are HPb57-3, HPb59-1 and HPb60-2.
Heating and temperature control of forged brass gate valves                                    
At present, there are also electric induction furnaces for heating, but the best effect is the automatic gas heating furnace, which can automatically control the temperature, heat the sections uniformly, and can automatically detect and screen the standard sections. The performance of the forged brass gate valve is also getting better.
The purpose of segment heating is to improve the plasticity of the alloy, reduce the resistance to deformation, and also make the internal molecular structure of the alloy more uniform, so that the stamping parts can have a good linear structure and mechanical properties. The temperature range of forged brass gate valve refers to the temperature at which the segment is extruded from the beginning to the end of the extrusion. The higher the temperature, the better the extrusion, but too high a temperature will cause oxide scale on the metal surface, or even over-burning.
Since there is a certain amount of heat loss after the segment is heated to enter the mold cavity, and a certain temperature is also generated during the high-speed stamping process, the heating temperature of the segment is generally slightly higher than the red forging temperature range. The heating temperature varies according to the characteristics of different material grades, and is usually 130-200°C lower than the melting point of the metal. The red forging temperature of HPb57-3 brass and CW617N brass is 650~750℃, and the red forging temperature range of HPb60-2 is 670~730℃.

Stamping equipments for forged brass gate valves                                                   
The red forging of forged brass gate valves can be realized on an ordinary general-purpose press. Since the rigidity, stamping stroke and accuracy of the closed press are higher than that of the open press, the gate valve body stamping equipment generally uses a closed press, and the valve body can also be open when the size of the valve body is particularly small. The choice of stamping equipment mainly lies in the reasonable choice of nominal pressure, the limitation of stamping stroke and maximum die height, and the size of the worktable should be considered when necessary. Nominal pressure is the most important selection parameter, which is determined by measuring and calculating the forging pressure required for forged brass gate valve body deformation, and the simplified formula for composite deformation resistance is F=kσs. Where: F composite deformation resistance; σs extrusion end temperature material deformation resistance or yield limit, HPb59-1 and HPb60-2 hot forging end temperature is about 650℃, the yield limit is about 60MPa at this time; the coefficient K is actually very Complex, involving many influencing factors, mainly the weight of the segment, the complexity of the extrusion and the wall thickness, etc., and the forged brass gate valves are not simple solid stamping of upper and lower convex and concave dies, but more with core pulling. To squeeze, the forging force not only provides the longitudinal forging pressure, but also requires the horizontal clamping force.
Attention points for forged brass gate valves                           
1. Before the red forging of forged brass gate valves, the mold cavity should be preheated, and the temperature should be controlled at about 250~300℃ to reduce the scrap of cold mold.

2. The joint surface between the various parts of the mold should be within the design tolerance range to ensure a good sliding state during movement.

3. In addition to reasonable mold material grades, module blanks need to be upset repeatedly, and heat treatment before mold use is also very important.

4. Inlays and cores should be regularly repaired and repaired. The cavity of the inserts is designed according to the tolerance of the valve body shape. During the mold repair process of forged brass gate valves   , the size of the large cavity will be increased, and the flash between the inserts should be considered.

5. The rigidity of the forged brass gate valve is guaranteed, especially for the medium core. Once deformed, the machining allowance must be increased if the core is deformed, and the blank will be scrapped if the core is heavy.

6. After a certain modulus is produced, it is necessary to spray the mold release machine on the cavity in time to ensure the smooth demolding of the blank.
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