The boiler piping system of a thermal power plant undertakes the core tasks of high-temperature steam transmission, pressure regulation and medium isolation. Its operating environment has the characteristics of high pressure, high temperature and medium corrosiveness (such as sulfur-containing flue gas, steam condensate). Under this working condition, the valve needs to have the ability of fast response, reliable sealing and long-term stable operation. The high-temperature and high-pressure electric welded gate valve Z964Y-P54.5150I has significantly improved the opening and closing efficiency of the boiler pipeline system through the combination of structural optimization, material innovation and intelligent control technology, and has become a key equipment to ensure the safe and economical operation of thermal power plants.

I. Improvement of opening and closing efficiency by structural design optimization

Welded valve body and compact flow channel design

The gate valve Z964Y-P54.5150I adopts a fully welded valve body structure, eliminating the leakage risk of traditional flange connections. At the same time, the overall strength is improved through forging technology (such as ASTM A182 F22 alloy steel) to ensure no deformation under 54.5MPa high pressure. The inner cavity of the valve body adopts a straight-through flow channel, which reduces the medium flow resistance by about 30%, reduces the pressure difference load during opening and closing, and shortens the valve action time.

Rigid double gate and self-tightening sealing structure

The electric gate valve Z964Y-P54.5150I adopts a parallel double gate design, which realizes adaptive fitting of the sealing surface through the dual effects of spring preload and medium pressure. Under high temperature conditions, the metal seal between the gate and the valve seat can withstand particle erosion and thermal expansion deformation, avoiding repeated adjustments or opening and closing jams caused by wear of the sealing surface.

Valve stem anti-jamming and fast transmission mechanism

The valve stem surface of the gate valve Z964Y-P54.5150I is nitrided, and the hardness is increased to above HRC50. With low friction coefficient fillers, the opening and closing torque requirements are reduced. The rising stem structure design makes the valve stem stroke visible, combined with the short stroke optimization of the electric actuator, to achieve fast and accurate positioning.

II. Enhancement of reliability through material and process innovation

High temperature and high pressure resistant material system

The valve body and key pressure-bearing parts of the electric gate valve Z964Y-P54.5150I are forged with chromium-molybdenum steel, with a high temperature yield strength of more than 300MPa, and can withstand long-term thermal fatigue at 600℃. The sealing surface is welded with Stellite No. 6 alloy, with a hardness of ≥HRC45, and the anti-scratch performance is 5 times higher than that of ordinary stainless steel, reducing the damage to the sealing surface during the opening and closing process.

Anti-corrosion and anti-erosion treatment technology

For the sulfur-containing steam environment of thermal power plants, the inner surface of the electric gate valve Z964Y-P54.5150I is sprayed with tungsten carbide (WC) coating, and the resistance to sulfuric acid dew point corrosion is improved by 80%. The valve stem and guide sleeve are designed with cemented carbide to reduce the erosion and wear of the moving pair by the granular medium.

Welding process and heat treatment control

The valve body welding adopts narrow gap TIG welding process, combined with post-welding local stress relief heat treatment (temperature controlled at 650±10℃), to eliminate welding residual stress and avoid the risk of weld cracking caused by high-temperature opening and closing operations.

III. Operation and maintenance strategy to ensure long-term efficiency

Preventive maintenance system

Establish a quarterly inspection system, focusing on the detection of sealing surface wear, valve stem straightness and electric actuator insulation resistance. Use endoscope technology to check the erosion of the inner wall of the flow channel and repair local damage in time.

Lubrication and cleaning management

High-temperature lithium-based grease is injected into the valve stem thread and guide sleeve every six months to reduce friction resistance. Regularly flush the valve cavity scale (using pH7-9 neutral cleaning agent) to prevent solid particles from accumulating and affecting the gate movement.

The high-temperature and high-pressure electric welded gate valve Z964Y-P54.5150I successfully solved the bottleneck of opening and closing efficiency of the boiler pipeline system of thermal power plants under high parameter conditions through the deep integration of structural innovation, material strengthening and intelligent control. Its technical route provides an important reference for valve selection in the thermal power industry. In the future, with the in-depth application of technologies such as digital twins and edge computing, valve opening and closing efficiency and system safety will reach a higher level.

When looking for high-quality, reliable boiler 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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