In modern large-scale power station boiler systems, high-temperature and high-pressure stop valves are key control components, and their performance stability and reliability are crucial to the safe operation of the unit. J61Y-25 forged steel welded stop valves, as a valve widely used in high-temperature and high-pressure environments, have a direct impact on the overall performance and service life of the valve due to the quality of their welding process. This article will focus on analyzing the optimization of the welding process of J61Y-25 forged steel welded stop valves in order to improve their reliability in high-temperature and high-pressure environments.

I. Structure and material properties of J61Y-25 stop valves

J61Y-25 stop valves belong to the high-temperature and high-pressure stop valve series and are mainly used in high-temperature and high-pressure fluid control systems such as power station boilers. The valve is usually made of high-temperature alloy materials such as chromium-molybdenum-vanadium steel to ensure its strength and corrosion resistance under high temperature and high pressure. Its structural features include pressure self-tightening seal design, stellite cobalt-based alloy surfacing on the sealing surface, and valve stems that have been quenched and nitrided to enhance their corrosion resistance and abrasion resistance.

Due to its special application environment, the welding process of the J61Y-25 stop valve must meet the requirements of high temperature and high pressure, corrosion resistance and erosion resistance. In particular, the welding of the valve cover needs to achieve full welding sealing, which poses a higher challenge to the welding process.

II. Welding process optimization analysis

The optimization of the welding process is the key to improving the performance of the J61Y-25 stop valve. According to its material and application characteristics, the following welding process optimization strategies should be considered:

1. Material selection and pretreatment:

Select welding materials that match the valve body material to ensure the strength and corrosion resistance of the weld.

Strictly clean and preheat the weldment to reduce the risk of welding cracks and abnormal hardness of the heat-affected zone.

2. Welding method and parameter control:

For complex structures such as valve covers, a welding method combining argon arc welding primer and manual arc welding filling is used to ensure weld quality and efficiency.

Strictly control parameters such as welding current, voltage and welding speed to reduce the risk of welding defects and abnormal hardness of the heat-affected zone.

Control the interlayer temperature to avoid excessively high or low temperatures that affect the welding quality.

3. Post-weld heat treatment:

Perform post-weld heat treatment to eliminate welding stress, restore the mechanical properties of the material, and improve the corrosion resistance of the valve.

4. Quality control and testing:

Adopt advanced non-destructive testing technologies such as ultrasonic testing and radiographic testing to strictly control the quality of the welds to ensure the integrity and reliability of the welds.

Test the hardness and metallographic structure of the welds to ensure that they meet the design requirements.

5. Structural design and anti-scouring considerations:

Optimize the internal structural design of the valve body to reduce fluid scouring and increase the service life of the valve.

During the welding process, pay special attention to the uniformity and strength of the weld to avoid failure caused by local scouring.

6. Pollution control during welding:

Ensure the cleanliness of the oil during welding and reduce the impact of impurities and pollutants on the quality of the weld.

III. Maintenance strategy

In order to ensure the long-term stable operation of the J61Y-25 stop valve, in addition to the optimization of the welding process, effective maintenance strategies need to be adopted:

Regularly inspect the valve, including weld inspection and sealing inspection, to promptly discover and deal with potential problems.

Develop a preventive maintenance plan and regularly replace wearing parts to ensure the long-term reliability of the valve.

Welding process optimization of the J61Y-25 forged steel welded stop valve is the key to improving its reliability under high temperature and high pressure environments. Through the optimization of material selection, welding method and parameter control, post-weld heat treatment and quality control, the strength and corrosion resistance of the weld can be effectively improved, and the service life of the valve can be extended. At the same time, combined with structural design and anti-scouring considerations, as well as effective maintenance strategies, the reliability of the J61Y-25 stop valve in the power plant boiler system can be further improved.

When looking for high-quality, reliable Stop 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

Yoyik offers various types of spare parts for steam turbines, generators, boilers in power plants:
Electric gate valve Z961Y-P55160I SA-182 F22
Check valve H61Y-320P
valve HED 8 OP-20/350K14AS
Check valve H61H-16P
Pneumatic air exhaust valve J661Y-P55.5190V ZG15Cr1Mo1V
centrifugal pump parts YCZ50-25
Sealing KIT NXQA50/31.5-L-YJ-9
globe check valve 10FWJ1.6P
hydro electric servo valve 760N1190B
Servo valve 761-4066B1
globe valve dn100 WJ65F-1.6P
solenoid valve DG4V 3 2AL M U D6 60
Stop valve J61Y-P55.5190P 304
Electric stop valve J961H-300LB
hydraulic screw pump HSN280-43NZ
Parker D3FB E01U C0N-S03
Drain valve J65Y-2500SPL SA-182 F91
Sealing components KHWJ10F 1.6P
Instrument valve J21H-100P
Submerged pump with motor 65YZ50-50
Safety valve A68Y-P55.535V
Circulating oil pump DLZB820R64B
Mechanical seal ZU44-45
External gear pump AZPW-21-004 RQRXXMB-S0593
Electric stop valve J961Y-320 25
pressure relief valve YSF9-70/130
Vacuum stop valve DKJ41H-16C
Bellows sealed steel globe valve KFWJ40F1.6P
Pressure Relief Valve YSF9-70/130KKJ
accumulator bladder NXQ-AB-180/10-FY
HYDRAULIC SERVO VALVE SM4-20(15)57-80/40-10-S182
Cooling fan YE2-80M1-6
Oil Seal HPT-300-340-6S/27/PCS1002002380010-01/420.01/2-204221688