Multi-turn valve structure features a detailed introduction - globe valve

2025-10-03 10:11:35
Shut-off valves and angle shut-off valves are widely used in various piping systems due to their versatility and reliability. These valves are particularly recommended for applications where throttling is required, as they can effectively control the flow of fluids. One of the key advantages is the ability to provide a true bubble-tight seal when equipped with a resilient seat, ensuring no leakage even under pressure. Additionally, these valves are well-suited for frequent operations, making them ideal for industrial environments where consistent performance is essential. However, there are some drawbacks to consider. One major disadvantage is the significant pressure drop that occurs during operation, which may affect system efficiency. Moreover, the cost of shut-off valves tends to be higher compared to other valve types, which could be a factor in budget-sensitive projects. In terms of disc and seat design, the elastic (soft) seat disc is generally the preferred choice for most applications. It offers excellent sealing properties and is suitable for a wide range of media. However, for high-temperature systems, precise throttling requirements, or media containing abrasives, a metal alloy disc is more appropriate. PTFE is often considered the best material for resilient seats in standard piping systems, while rubber provides better flexibility in cold water environments. For plug-in disc and seat configurations, metallic alloys with high hardness are commonly used. These are especially beneficial in situations where precise flow control is necessary, and the fluid temperature exceeds the Teflon limit (260°C), or when the medium contains abrasive particles. In cast iron stop valves, a semi-insert bronze disc and seat structure is typically employed, offering a balance between durability and cost-effectiveness. Automatic steam cut-off check valves and angle shut-off valves are particularly well-suited for medium-pressure steam systems. The sliding action of the semi-plug-in disc allows these valves to function not only as shut-off and throttle valves but also as check valves, enhancing their operational versatility. This makes them a valuable choice in steam piping applications where multiple functions are needed in a single unit.

Parts & Auxiliary Equipment Of Injection Machine

Major Parts of Injection Machine

  1. Injection Unit (also known as the "Injection System" or "Shooting Pot")

    • Melts and injects the Plastic Material into the mold.
    • Consists of a hopper, barrel, and screw.
    • The screw rotates to move the plastic forward and inject it into the mold cavity.

  2. Clamping Unit (also known as the "Mold Clamping Unit")

    • Securely holds the mold during the injection process.
    • Consists of a clamping system that applies sufficient force to keep the mold closed.
    • Prevents mold movement or leakage of molten plastic.

  3. Hydraulic Unit

    • Provides the necessary power for the clamping unit and other moving parts.
    • Consists of pumps, motors, valves, and cylinders.
    • Converts hydraulic oil pressure into mechanical motion.

  4. Control Unit

    • Controls and monitors the entire injection molding process.
    • Ensures precise timing, temperatures, pressures, and speeds.
    • Allows for automated operation and remote monitoring.

Auxiliary Equipment

  1. Feeding System

    • Automatically delivers the plastic material to the injection unit.
    • Ensures consistent material supply and reduces downtime.

  2. Mold Temperature Controller

    • Maintains the desired mold temperature for optimal molding results.
    • Reduces cycle time and improves product quality.

  3. Material Handling Equipment

    • Facilitates the loading, unloading, and transportation of plastic materials and finished products.
    • Ensures efficient material flow and reduces labor costs.

  4. Robotics

    • Automates the removal of molded parts from the mold.
    • Reduces human error and improves productivity.

  5. Cooling System

    • Ensures rapid cooling of the molded parts to achieve the desired shape and dimensions.
    • May include water chillers, fans, and other cooling devices.

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