Pressure fluctuations are a common operational challenge in the boiler system of a thermal power plant. Due to changes in combustion conditions, load adjustments or external interference, the medium pressure in the boiler pipeline may rise or fall instantly, resulting in frequent opening and closing or adjustment of the valve. In this dynamic environment, the stability of the valve is directly related to system safety and efficiency. With its unique design and technical advantages, the high-pressure forged steel pneumatic control valve T667H-16C has become the core solution for coping with boiler pipeline pressure fluctuations.

I. Structural design and pressure fluctuation adaptability

1. Forged steel valve body and impact resistance

The pneumatic control valve T667H-16C adopts an integrally forged carbon steel or alloy steel valve body, and optimizes the grain structure through heat treatment process, significantly improving fatigue resistance and impact resistance. The valve body wall thickness and flow channel design have been optimized through fluid dynamics simulation, which can effectively disperse local stress when the pressure changes suddenly, avoiding crack initiation caused by alternating loads. The non-welded structure formed by the forging process eliminates the potential leakage points of traditional cast valves and ensures sealing reliability under high pressure difference.

2. Fast response and damping control of pneumatic actuators

The regulating control valve T667H-16C is equipped with an intelligent pneumatic actuator, which integrates a pressure feedback sensor and a PID adjustment module to sense pipeline pressure changes in real time and dynamically adjust the valve opening. The piston or diaphragm structure of the actuator uses a multi-stage buffer design to reduce the direct impact of air pressure fluctuations on the movement of the valve stem. For example, when a sudden increase in boiler load causes a sudden drop in pressure, the actuator controls the valve stem displacement speed within a safe range through a preset damping coefficient to avoid medium impact or mechanical damage to valve components caused by excessively fast adjustment.

3. Linear adjustment characteristics of valve core and valve seat

The valve core of the regulating valve T667H-16C adopts a V-shaped or butterfly structure to form a symmetrical flow channel with the valve seat to ensure a linear relationship between flow and opening. This design can accurately match flow requirements when pressure fluctuates, reducing over-adjustment or under-adjustment caused by nonlinear response. The valve core surface is hardened and combined with the self-cleaning flow channel design to resist the erosion and wear of high-temperature steam or particle-containing media, maintaining long-term stable adjustment accuracy.

II. Dynamic response and stability control mechanism

1. Adaptive regulation under pressure fluctuation

The T667H-16C pneumatic control valve forms a closed-loop control system through the built-in pressure transmitter and actuator. When abnormal pipeline pressure fluctuations are detected, the controller can quickly calculate the target opening and achieve precise valve adjustment through the rapid response of the pneumatic actuator. For example, when the boiler safety valve suddenly starts to jump and causes a sudden drop in pressure, the control valve can quickly increase the opening to balance the system pressure and avoid chain failures caused by pressure loss.

2. Damping design and vibration suppression

The high-pressure control valve T667H-16C is equipped with a multi-stage damping device, including an elastic damping ring of the valve stem guide sleeve and a fluid buffer chamber in the valve chamber. The damping ring can absorb the high-frequency vibration energy in the movement of the valve stem and suppress the mechanical resonance caused by pressure pulsation; the buffer chamber dissipates energy through changes in fluid pressure, reducing eddy currents and noise caused by sudden changes in flow velocity inside the valve. This design enables the valve to maintain stable operation when the pressure fluctuates, avoiding valve core jamming or abnormal wear of the sealing surface.

III. Reliability guarantee of materials and sealing technology

1. Selection of high-pressure and corrosion-resistant materials

The valve body and valve trim are made of forged carbon steel, which has both high strength and corrosion resistance. The surface of the parts in contact with high-temperature steam is treated by nitriding or spraying ceramic coating to form a wear-resistant and high-temperature oxidation-resistant protective layer. In media containing sulfides or chloride ions, the material’s resistance to stress corrosion cracking can ensure the structural integrity of the valve under long-term high-pressure fluctuations.

2. Metal hard seal and zero leakage design

In view of the high temperature and high pressure characteristics of boiler pipeline media, the pneumatic control valve T667H-16C adopts a metal-to-metal hard seal structure. The conical surface matching accuracy of the valve core and the valve seat reaches the micron level, and the sealing contact pressure is maintained by the preload and pressure self-compensation function. Even when the pressure fluctuates violently, the metal-to-metal contact of the sealing surface can still resist the erosion of the medium and achieve zero leakage. Compared with soft-sealed valves, its impact resistance life is increased by 3-5 times.

The pneumatic high-pressure forged steel regulating valve T667H-16C achieves excellent stability in the environment of boiler pipeline pressure fluctuations through the coordinated optimization of structural design, material selection and intelligent control. Its impact-resistant valve body, adaptive adjustment algorithm and zero-leakage sealing technology not only ensure the safe operation of the system, but also reduce maintenance costs and energy loss.

When looking for high-quality, reliable pneumatic valves, YOYIK is undoubtedly a choice worth considering. The company specializes in providing a variety of power equipment including steam turbine accessories, and has won wide acclaim for its high-quality products and services. For more information or inquiries, please contact the customer service below:

E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229

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