Epoxy Resin dispensing Nozzle Assembly Spare Parts - JHIMS

The needle, seal, valve body and other parts of the epoxy resin dispensing valve are the core components of the dispensing valve. Together, they ensure the precise dripping, flow control and sealing performance of the glue. The quality and design of these parts directly affect the accuracy, stability and life of epoxy resin dispensing. The following is a detailed introduction to these key parts:

1. Needle / Nozzle

The needle is the part of the dispensing valve that directly contacts the glue. It controls the release and flow of the glue. Especially for high-viscosity materials such as epoxy resin, the design of the needle is crucial.

- Function: The main function of the needle is to control the outflow and flow rate of the glue. It usually consists of a needle head, a needle seat, etc. During the dispensing process, the opening size of the needle head directly determines the amount of glue dispensed each time.

- Material: The needle is usually made of corrosion-resistant and wear-resistant materials, such as stainless steel, hardened steel or ceramic. Since epoxy resin has high viscosity and strong adhesion, the needle needs to have high corrosion resistance, wear resistance and anti-clogging ability.

- Design type: Common designs include round hole nozzles, needle nozzles, micro needles, etc. Choose the appropriate spray needle according to different application requirements. For example, in precision dispensing applications, spray needles with smaller diameters and higher precision are usually selected to achieve small amounts of fine dispensing.

- Cleaning issues: Spray needles are easily clogged due to the viscosity of the glue, especially epoxy resins have strong adhesion. If they are not cleaned in time, they may cause nozzle clogging. Therefore, the spray needle needs to be easy to clean when designed, or equipped with an automatic cleaning system to reduce cleaning work.

 

2. Seals (Seals / O-rings)

Seals play a role in preventing glue leakage and protecting the system in epoxy resin dispensing valves. The high pressure, sealing and glue adhesion of the dispensing valve have high requirements for seals.

- Function: Seals are used to ensure the sealing inside and outside the dispensing valve body to prevent glue leakage. They are usually set at the joints of the valve body, the interface between the valve seat and the spray needle, and other parts that need to be sealed.

- Material: Since the epoxy resin dispenser is exposed to chemical solvents and high temperatures during operation, the sealing material must be resistant to high temperature, corrosion and aging. Commonly used sealing materials include fluororubber (FKM), silicone, PTFE (polytetrafluoroethylene), etc.

- Application location: Seals are usually located in the following locations:

- The contact point between the spray needle and the valve body: to ensure that the glue does not leak during the movement of the spray needle.

- The various connection interfaces of the valve body: such as the connection between the valve body and the pneumatic actuator, glue supply pipeline, etc.

- The joint between the pumping system and the valve body: to ensure that there is no leakage during the transmission of glue.

- Importance: Good sealing performance can prevent glue leakage and air from entering the system, ensuring the stability of the dispensing process. If the seal is damaged or aged, it may cause glue leakage or system loss of control, so it is very important to check and replace the seal regularly.

 

3. Valve Body

The valve body is the core structure of the dispensing valve, supporting and surrounding all other components, such as the spray needle, seals, etc. The design and material of the valve body have an important impact on the performance and life of the dispensing valve.

- Function: The valve body is used to accommodate all components of the dispensing valve and transmit air pressure or electricity to the spray needle or piston to switch and adjust the glue flow as required. It also provides a fixed position for the seal to ensure the sealing of the system.

- Material: The valve body usually uses high-strength, corrosion-resistant metal materials such as stainless steel (304 or 316 type) or aluminum alloy. For high-precision dispensing operations, the valve body of some high-end equipment may also use materials such as hard anodized aluminum to improve durability and corrosion resistance.

- Design requirements:

- High-precision processing: The valve body must be processed with high precision to ensure that all parts can be accurately matched to avoid leakage and blockage.

- High temperature and chemical corrosion resistance: The curing temperature of epoxy resin is high, so the valve body needs to be able to withstand a certain high temperature. At the same time, since epoxy resin may contain solvents, the valve body needs to have good chemical corrosion resistance.

- Easy to disassemble and maintain: The design of the valve body should be easy to maintain and clean, especially the residual glue in the valve body needs to be cleaned regularly.

 

4. Piston

The piston is a component used to push the glue flow, especially in the piston dispensing valve, the piston plays a role in controlling the glue delivery.

- Function: The piston pushes the glue flow by reciprocating motion inside the valve body to control the amount of glue released. The position and speed of the piston are controlled by adjusting the air pressure or electricity to achieve precise control of the dispensing amount.

- Material: The piston is usually made of wear-resistant and corrosion-resistant metal or plastic materials. In order to ensure accuracy, the fit between the piston and the valve body needs to be very tight to prevent glue leakage.

- Sealing: The piston is usually equipped with a sealing ring to ensure the sealing between the piston and the valve body. The sealing ring must have good corrosion resistance, high temperature resistance, and can maintain the sealing effect for a long time.

 

5. Seat

The valve seat is a fixed part in the dispensing valve. It is usually used with the spray needle to ensure that the spray needle can be completely closed when not working, thereby preventing glue leakage.

- Function: The valve seat plays a fixing and sealing role in the closing and opening process of the dispensing valve, ensuring that no glue flows out of the nozzle when the spray needle is closed. It is usually used with seals to ensure high sealing.

- Material: The valve seat is generally made of wear-resistant and corrosion-resistant metal materials or special synthetic materials, and sometimes a coating is added to improve durability and sealing.

 

6. Adjustment Screw

The adjustment screw is used to adjust the flow and pressure of the dispensing valve to ensure that the glue can flow as needed.

- Function: The adjustment screw is usually located outside the dispensing valve. By adjusting the rotation of the bolt, the opening inside the valve can be changed, thereby adjusting the flow of glue.

- Material: The adjustment screw generally uses corrosion-resistant metal materials, such as stainless steel or alloy, to ensure its stability in the epoxy resin production environment.

 

7. Cleaning system

The cleaning system of the dispensing valve is mainly used to remove residual epoxy resin and prevent clogging. The cleaning system may include:

- Automatic cleaning device: The automatic cleaning device cleans the spray needle, valve body and other parts of the dispensing valve through air flow or solvent injection.

- Cleaning solvent: Solvents (such as alcohol, acetic acid, etc.) are used to clean the resin residue inside the dispensing valve to ensure that the valve is clean before each dispensing.

The spray needle, seal, valve body, piston and other parts in the epoxy resin dispensing valve must not only ensure dispensing accuracy, flow control and sealing, but also have the characteristics of high temperature resistance, corrosion resistance and wear resistance to meet the special needs of high-viscosity materials such as epoxy resin. Each component needs to be precisely designed and processed to ensure the long-term stability and production efficiency of the dispensing machine.