Pneumatic control steel globe valve

Cập nhật lần cuối ngày 15/06/2023 lúc 09:21 sáng

Introduction to Pneumatic Control Steel Globe Valve

The Pneumatic Control Steel Globe Valve (Van cầu thép điều khiển khí nén) is a type of pneumatically controlled globe valve with the valve body cast from carbon steel.

This device consists of two main components: the pneumatic actuator and the valve body. These components are separately designed and then assembled together to form a complete device.

The valve is operated by supplying high-pressure compressed air to the pneumatic actuator, with the common valve diameter ranging from DN20 to DN300.

One outstanding advantage of globe valves in general is their ability to regulate flow rate effectively for both gases and liquids, in addition to their on-off functionality.

With a valve body made of steel, this device is capable of operating in high-temperature and high-pressure systems.

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Structure of Pneumatic Control Steel Globe Valve

The Pneumatic Control Steel Globe Valve is composed of two main parts: the pneumatic actuator, the valve body, and the state positioning component.

The valve stem is connected to the actuator stem, and these two parts are fixed together through a metal frame or metal bars.

Pneumatic Transmission System of Globe Valve

The pneumatic transmission system of the pneumatic control steel globe valve is a device that generates linear motion along the valve axis by changing the supplied compressed air pressure to the transmission system. This motion is then transmitted to the valve disc through the shaft components, resulting in a change in the working state of the device.

The transmission system body is made of steel and includes a pressure barrier membrane, transmission shaft, spring system, disc shaft, valve shaft, and other components.

To ensure efficient operation of the transmission system and better control of the pneumatic control steel globe valve, manufacturers often install a positioning device with the valve. This device collects information about the operational state of the pneumatic control steel globe valve, displays it, and transmits the signals to the control center. The positioning device helps to control the valve accurately and easily.

Valve Body Components

The body of the pneumatic control steel globe valve is the part directly connected to the working pipeline, using installation types such as threaded, flanged, or welded connections.

The valve body is cast from a solid piece of carbon steel. However, not all internal components of the valve body are made of this material. Depending on their specific functions, suitable materials are chosen for their construction.

For example, the valve shaft and disc are two components responsible for transmitting force and directly controlling flow. They are made of stainless steel to prevent oxidation and withstand impact forces better.

Diverse Installation Methods for Pneumatic Control Steel Globe Valve

Based on practical requirements, valve installation with different pipeline systems is designed to meet technical requirements while ensuring easy and quick installation.

Therefore, designing multiple installation methods for a valve series is highly suitable.

Flanged Installation of Pneumatic Control Steel Globe Valve

During the manufacturing process of the valve body, two flanges are cast on each end of the valve bonnet. However, after casting, these flange surfaces do not meet the requirements for installation. They need to go through several cutting and grinding steps to achieve precise specifications.

The diameter and thickness of the valve flanges are calculated and tested to meet the pressure resistance requirements as specified.

To install the flanged pneumatic control steel globe valve into pipeline systems, accessories such as bolts, nuts, and rubber gaskets are required.

The devices are available at VIVA with sizes ranging from DN20 to DN400, and flange standards include JIS, DIN, and ANSI.

Pneumatic Control Steel Globe Valve with Threaded Ends

The valve is designed with threaded ends on both valve ports, primarily with an internal threaded design. With this design, the valve can be connected to the external thread of the pipeline.

The valve body is compact and lightweight, allowing direct connection to the pipeline system, requiring fewer accessories compared to flanged installations.

This equipment has the ability to withstand high working temperatures and pressures, making it suitable for various specialized systems.

We provide this equipment in sizes ranging from DN25 to DN80.

Applications of Pneumatic Control Steel Globe Valve

Pneumatic control steel globe valves have a special and relatively expensive design, which is why they are not commonly used in regular systems. Instead, these products are widely used in industrial systems and pipelines that transmit highly mobile fluids, making it difficult to control the flow rate.

The applications of the Pneumatic Control Steel Globe Valve are demonstrated through the following specific examples:

• Application in boiler systems, hot steam pipelines for drying, processing of food, grains, wood processing industry, etc.
• Application in compressed air pipelines, gas pipelines, liquefied gas pipelines, etc.
• Application in chemical systems, oil refining plants.

For more products, see Pneumatic Control Cast Iron Globe Valve