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 ball, 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 spherical segment structure of the opening and closing 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, and a large adjustable range with a maximum adjustable ratio of 100:1. The V-type ball valve is suitable for various pipelines with pressure ratings of 150～600LB, PN1.6～6.4MPa, and operating temperatures ≤300℃ (high-temperature customization available). It is used to regulate the pressure and flow of media in pipelines. 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 uses the eccentric wedge principle to achieve the purposes of gate tightening, regulation, and closing through a transmission mechanism. The sealing pair is a metal face ring with hard surface contact sealing. When opened, the valve core is located in the ball storage chamber, providing a large flow area and preventing the valve from being scoured. When closed, the valve core is not scoured. 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 flow that is 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 surface is combined into various types such as corrosion-resistant, wear-resistant, and high-strength to meet the needs of different occasions.
3. Tight sealing, with zero leakage when conveying harmful gases.
4. The valve core of the sealing pair has a compensation allowance. After the valve is worn, rotating it slightly when closing can still ensure reliable sealing, extending the service life. In addition, users can remove the gland nut, adjust or replace the valve seat which is still usable, avoiding the drawback 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 two-phase mixed flow of liquid and solid, or where chemical reactions in liquid transportation cause crystal precipitation or scaling.
5. Special valve for pulverized coal and ash residue: Specification DN40－1600. Suitable for power plants, hydraulic slag removal, or control of pneumatic transportation pipelines.

IV. Parts:

V. Performance Specifications: