PBQ Double eccentric hemispherical valveDetailed product description：

Overview:
The PBQ double eccentric hemispherical valve adopts the eccentric principle to achieve the purpose of locking, adjusting, and closing through the transmission mechanism. The sealing pair is a metal surface ring hard surface contact seal. The double eccentric structure has a valve core located in the ball storage chamber when it is opened, with a large flow cross-section and the valve is not flushed. When it is closed, the valve core is not flushed. When it is opened, the spherical surface of the valve core gradually moves along the valve seat, effectively removing scaling obstacles and achieving reliable sealing. It is particularly effective for mixed flow transportation of two-phase mixed flow that is prone to scaling and solid precipitation.

The second characteristic of the valve is that the hemisphere is made of bimetallic material, and different alloys are deposited on the base metal. The valve seat is also deposited with corresponding special treatment, and the sealing surface is composed of various types such as anti-corrosion, wear-resistant, and high-strength to meet the needs of different occasions,

The third characteristic is that sealing is strictly prohibited, and the transmission of harmful gases can achieve zero leakage,

The fourth feature is that the valve core of the sealing pair has a compensation amount. When the valve seat is worn (the hardness of the valve seat is lower than that of the valve core), it can still be reliably sealed and extend its service life by rotating it slightly when closed. In addition, the user can unscrew the compression nut, adjust or replace it, and the valve seat can still be used, avoiding the drawbacks of many current valve sealing failures and complete scrapping. Therefore, the selection of bimetallic sealing pairs with different alloys (or combination balls) for welding can be used in different industrial sectors that require wear resistance, corrosion resistance, high temperature resistance, and strict sealing.

Main uses:
1. General purpose valve: Specification and model PN1.0-4.0Mpa, DN40-1200. Suitable for applications with strict requirements such as sewage treatment, pulp, urban heating, etc.
2. Oil chemical special valve: specification DN40-1200, PN1.0-4.0Mpa, suitable for various oil products such as crude oil and heavy oil, weak corrosion and two-phase mixed flow media in the chemical industry. The temperature resistance can reach 425 ℃.
3. Gas specific valve: Specification DN40-1200, PN1.0-4.0Mpa, suitable for transportation control of coal gas, natural gas, and liquefied gas. The product structure features a sealing pair welded with different chromium containing stainless steel, with tight sealing and corrosion resistance.
4. Slurry specific valve: specification DN40-1200, suitable for industrial pipeline transportation in liquid and solid two-phase mixed flow or liquid transportation where chemical reactions result in crystal precipitation or scaling. The product structure features different media and temperature requirements according to customer needs. The sealing secondary welding core is welded with chromium molybdenum vanadium alloy, and the valve seat is welded with chromium molybdenum vanadium alloy, chromium alloy, and stainless steel alloy welding rods to meet the needs of different slurry transportation.
5. Coal powder ash special valve: specification DN40-1200, suitable for controlling power plants, hydraulic slag removal, or gas transmission pipelines. The product requires wear resistance. The valve core adopts a combination of ball type bimetallic materials, which have high rigidity and are very wear-resistant. The valve seat adopts integral wear-resistant No. 1 or full welding, and has the characteristics of a hard sealed ball valve.

Product Features:
1. Large circulation area and low flow resistance. This is because the valve core is located in the ball storage chamber after opening, and the fluid flows directly through.
2. The operating torque is small, and it can be opened and closed by turning 90 degrees, making the operation easy.
3. Sealed tightly, double eccentric metal hard seal. Scaling does not affect opening and closing, which is the most significant advantage of hemispherical valves.
4. Long service life, wear-resistant sealing pair, and compensation capacity. The valve seat can be adjusted or replaced.
Execution Standard:
Design according to GB12237-89, flange connection according to JB79.1 (steel), and structural length in accordance with GB12221-89 standard.