Electric eccentric hemispherical valve

I. Product Overview:
The PQ940F electric eccentric hemispherical valve adopts a spring-loaded movable seat structure, which prevents jamming or separation between the valve seat and the sphere, ensuring reliable sealing and a long service life. The V-notched ball core of the eccentric hemispherical valve has a shearing effect with the metal valve seat, making it particularly suitable for media containing fibers, fine solid particles, and slurries. It is especially advantageous for controlling pulp in the paper industry. The V-shaped segment structure of the closure member completely solves the problem of medium deposition in the valve cavity. When fully open, the valve has a large flow capacity and low pressure loss. The eccentric hemispherical valve features a compact structure, strong versatility, an approximately equal percentage flow characteristic, a large adjustable range, with a maximum adjustment ratio of 100:1. The V-type ball valve of the eccentric hemispherical valve is applicable to various pipelines (high-temperature customized) with pressure ratings of 150～600LB, PN1.6～6.4MPa, and operating temperature ≤300℃. It is used to regulate the pressure and flow of the medium in the pipeline. By selecting different materials, it can be applied to various media such as water, steam, oil, nitric acid, acetic acid, oxidizing media, urea, ammoniacal brine, and neutralized water.

II. Product Features
1. The double-eccentric hemispherical valve structure adopts the eccentric wedge principle to achieve the purposes of gate tightening, regulation, and closing through a transmission mechanism. The sealing pair is a hard-surface contact seal with a metal ring band. When opened, the valve core is located in the ball storage chamber, resulting in a large flow area and no erosion of the valve. When closed, the valve core is not eroded either. When opened, the spherical surface of the valve core gradually approaches the valve seat, effectively removing scaling obstacles and achieving reliable sealing. It is particularly effective for conveying two-phase mixed flows that are prone to scaling and solid precipitation.
2. The hemisphere of the valve is made of bimetal, with different alloys surfacing on the base material. The valve seat is also subjected to corresponding surfacing and special treatment. The sealing surfaces are combined into various types such as corrosion-resistant, wear-resistant, and high-strength, to meet the needs of different occasions.
3. Tight sealing, zero leakage when conveying harmful gases.
4. The valve core of the sealing pair has a compensation allowance. When the valve is worn, rotating it slightly during closing can still ensure reliable sealing, extending the service life. In addition, users can remove the packing gland, and the valve seat can still be used after adjustment or replacement, avoiding the disadvantage of scrapping the entire valve after sealing failure. By surfacing different alloys (or combining balls), the bimetallic sealing pair can be selected for working conditions that require wear resistance, corrosion resistance, high temperature resistance, and strict sealing.

III. Product Applications:
1. General-purpose valve: Specification DN40－1600. Suitable for occasions with strict requirements such as sewage treatment, pulp, and urban heating and supply.
2. Special valve for petrochemical industry: Specification DN40－1600. Suitable for crude oil, heavy oil, and other oil products, as well as weak corrosive and two-phase mixed flow media in the chemical industry.
3. Special valve for gas: Specification DN40－1600. Suitable for the transportation and control of coal gas, natural gas, and liquefied petroleum gas.
4. Special valve for slurry: Specification DN40－1600. Suitable for industrial pipeline transportation of liquid-solid two-phase mixed flows, or industrial pipelines where chemical reactions in liquid transportation cause crystal precipitation or scaling.
5. Special valve for pulverized coal and ash slag: Specification DN40－1600. Suitable for the control of power plants, hydraulic slag removal, or gas transportation pipelines.

IV. Parts:

V. Performance Specifications: