J961Y Electric Welding Station Shut-off Valve

The J961Y electric welding station stop valve is a high-performance shut-off valve specially designed for extreme working conditions in modern thermal power plants, petrochemical industries, and water systems. This valve is strictly designed and manufactured in accordance with the Japanese standard E101 for thermal power valves and the Chinese mechanical industry standard JB/T3595-93. Its structural length, pressure-temperature grades, and test inspections are all carried out in accordance with these two standards, ensuring the product's outstanding reliability and wide system compatibility in high-temperature and high-pressure environments. It is mainly applicable to nominal pressures PN20.0～32.0MPa (corresponding to Class 1500～2500 in the American standard) and the pressure grades P54 100V～P57 170V series, with a maximum working temperature of up to 570℃ (for the P57 170V model). It is widely used in main steam pipelines, water supply systems, and other oil and steam medium pipelines to achieve reliable cutting or connection of the medium. 

The most distinctive external feature of the valve is that the two ends of the branch pipe are connected by butt welding. This fully welded structure completely eliminates the potential leakage points at the flange connection, providing a permanent pipeline seal. It is particularly suitable for the main circuits of power stations with extremely high requirements for safety and sealing. The core of its interior adopts an advanced pressure self-tightening sealed middle cavity design, which enables the sealing performance to automatically enhance as the medium pressure increases, perfectly solving the problem of traditional bolt valve covers being prone to loosen and leak under high temperature and high pressure.

1. Innovative pressure-retaining seal and fully welded structure 

The middle chamber of the valve has abandoned the traditional bolt-type valve cover and adopted a unique pressure self-tightening sealing structure. This structure utilizes the pressure of the system medium itself to tightly compress the sealing elements (such as wedge-shaped sealing rings and four-ring combinations), achieving the physical characteristic of "the higher the pressure, the more reliable the seal", fundamentally ensuring zero leakage under 32 MPa ultra-high pressure. Combined with the butt-weld connections at both ends of the branch pipe, the valve integrates with the pipeline, not only having extremely high connection strength but also minimizing potential leakage paths, meeting the high requirements of power station pipelines for lifelong maintenance-free. 

2. Super-hard and wear-resistant cobalt-based hard alloy sealing surface 

The core sealing pair of the valve - the valve disc and the sealing surface of the valve seat - are both made of Stellite (a cobalt-based hard alloy) through plasma spraying or welding processes. This material layer has extremely high hardness (typically HRC ≥ 40), and possesses excellent wear resistance, high-temperature resistance, corrosion resistance and anti-abrasion properties. It can withstand the long-term high-speed erosion of steam at temperatures above 540°C, thereby extending the service life of the valve by several times and significantly reducing the maintenance costs and downtime frequency of the power station. 

3. Strengthened anti-corrosion nitrided valve stem 

The valve stem, as a key transmission component, is forged from high-performance nitrided steels such as 38CrMoAlA or 20Cr1Mo1V. It undergoes precise tempering and surface nitriding treatment. This process forms a hard and dense nitride layer on the surface of the valve stem, significantly enhancing its corrosion resistance and wear resistance. It also effectively reduces the friction coefficient with the packing, ensuring that the valve can still open and close smoothly and easily in high-temperature environments with low operating torque. 

4. Deep and reasonable packing chambers and corrosion-inhibiting sealing system 

The valve cover packing chamber has been optimally designed with an appropriate depth, capable of accommodating multiple layers of high-performance sealing packing. Typically, graphite or flexible graphite packing is used, with corrosion inhibitors added to it to form multiple reliable sealing rings. This combination not only ensures excellent sealing performance but also adapts to the slight thermal expansion of the valve stem, ensuring no external leakage at the packing area during long-term operation, and meeting strict environmental protection and safety standards. 

5. High-performance integrated electric actuator 

The valve can be equipped with the DZW series dedicated valve electric actuator. This actuator integrates a dedicated motor, reducer, torque control mechanism, stroke control mechanism, and hand-electric switching mechanism. Its features include a compact housing, light weight, and comprehensive functionality. It supports on-site operation, remote control, and seamless integration with DCS or PLC systems. It outputs a 4-20mA standard feedback signal, enabling the automation and intelligence management of the valve, significantly enhancing the operational efficiency and control accuracy of the power station system. 

6. Rigorous full-process standard compliance and quality verification 

From design, material selection, manufacturing to final testing, the valve is fully controlled by a strict standard system. Except for E101 and JB/T3595, its welding bevels comply with ASME B16.25 or GB/T12224, and the pressure-temperature grade strictly follows the ANSI B16.34 benchmark. Before leaving the factory, it needs to pass multiple strict tests including high-pressure shell strength test and high-pressure sealing test, to ensure that every performance indicator meets or exceeds the requirements of API 598 or JIS E101 standards, providing a solid guarantee for the long-term safe and stable operation of the power station.