Control Valve

• A control valve is a “final control element” used to regulate process conditions such as flow, pressure, temperature, and liquid level by adjusting the flow passage of fluids, gases, or steam. Operated by automated actuators, pneumatic, electric, or hydraulic, it receives signals from controllers to maintain precise downstream process parameters.
• The 10T Series cage-guided single-seat control valve adopts a cage-guided structure with a pressure-balanced plug, making it suitable for applications involving relatively high differential pressure. The balanced sealing ring replaces the upper seat, transforming the traditional cage double-seat valve structure into a cage single-seat design. This improvement greatly enhances the shut-off performance of the cage valve.
• The plug utilizes a pressure-balanced structure, which significantly reduces opening and closing forces. As a result, media under high differential pressure conditions can be controlled with relatively low actuator thrust. The valve is widely used for fluid control in medium- and low-temperature, as well as medium- and low-pressure pipeline systems that require excellent dynamic stability.
• Featuring excellent sealing performance, high allowable differential pressure, cage guiding, a large guiding area, high operational stability, and a compact structure, the valve also allows quick on-line trim replacement for improved maintenance efficiency, reducing both labor and downtime. The pressure-balanced plug structure ensures that the required actuator thrust is minimized.

• Standard Bonnet: The standard bonnet is designed for normal temperature service conditions. The bonnet material is the same as the valve body, providing effective sealing of the body and connection to the actuator. Working temperature range: -30°C to 230°C
• High Temperature Bonnet: The high temperature bonnet is specially designed for elevated temperature service conditions. A heat sink structure increases the contact area between the bonnet and surrounding air, improving heat dissipation and effectively protecting both the packing and actuator. Working temperature range: +230°C to 530°C
• Cryogenic Extended Bonnet: The cryogenic extended bonnet is suitable for low-temperature media such as liquid oxygen and liquid nitrogen. This extended design effectively protects the packing and actuator from extremely low temperatures. Standard materials include 304 or 316 stainless steel, and materials with different thermal expansion coefficients can also be selected according to service requirements. Working temperature range: -196°C to 45°C
• Metal Bellows Seal Bonnet: The metal bellows seal bonnet incorporates a stainless steel bellows assembly that isolates the process media from the external environment while allowing smooth upward and downward stem movement. In addition, a standard packing box is also provided to ensure reliable sealing, preventing leakage that could cause product loss or environmental contamination. Working temperature range: -60°C to 530°C

The flow characteristic of a control valve is the relationship between the flow of an incompressible fluid passing through the control valve and the valve opening, when the differential pressure across the two ends of the valve is constant. This flow characteristic is called the inherent flow characteristic. Typical inherent characteristics include linear and equal percentage characteristics. In practice, when the control valve regulates process media, the differential pressure across the valve changes with variations in opening. In this case, the relationship between valve opening and flow deviates from the inherent flow characteristic curve. This is referred to as the actual flow characteristic.

It indicates that the flow and the opening of the control valve have a linear relationship. It is usually used in applications where the differential pressure variation is small and nearly constant. When the pressure drop across the valve becomes the dominant pressure drop in the system, a linear flow characteristic is often adopted.

It indicates that the flow change rate caused by a change in valve travel is directly proportional to the current flow at that point. It is usually used in applications that require a relatively wide control range, or when the system pressure loss is much higher than that of the valve, or when both valve opening and differential pressure variations are relatively large.

It is mainly used for on-off control systems. It requires a high flow rate at small openings, and as the opening increases, the flow quickly reaches its maximum value. After that, even if the opening continues to increase, the flow changes very little.

The spring-actuated PTFE seal is a high-performance sealing element assembled with a special spring embedded in a U-shaped PTFE structure.
Under proper spring force and system fluid pressure, the seal lip is energized and pressed lightly against the sealing surface, thereby achieving excellent sealing performance.
The seal lip is designed to be short and thick, which is a key feature that helps reduce friction and extend service life.

» Suitable for both reciprocating and rotary motion applications.

» Compatible with most fluids and chemical media.

» Low friction coefficient.

» Prevents stick-slip (crawling) during precision control, thereby reducing valve dead band.

» Good wear resistance and dimensional stability.

» Capable of adapting to rapid temperature changes.

» Non-contaminating and suitable for clean service conditions.