An overview of the
BQ640F type pneumatic eccentric half ball valve USES the eccentric body, eccentric ball and seat, the stem for rotating movement in the common track automatically centering, closing the process of more and more tight, fully achieve the purpose of good sealing. The ball and the seat of the valve are completely separated, which eliminates the wear of the sealing ring and overcomes the problem of wear of the traditional ball seat and the sealing surface of the ball. The non-metallic elastic material is embedded in the metal seat, and the metal surface of the seat is well protected. Red valve brand PQ640F pneumatic eccentric ball valve is especially suitable for steel industry, aluminum, fiber, small solid particles, pulp, coal ash, LPG and other media.
The characteristics of
1. the structure adopts eccentric principle through the drive mechanism to lock tight tight, adjusting, closing, the purpose of sealing pair is surface contact seal ring hardfacing metal, double eccentric structure in the open when the valve core is located in the ball room, large flow area, and the valve is not washed, closing valve core is not washed, open the valve core sphere along the seat, effectively remove fouling obstacles, to achieve reliable seal. It is particularly effective for the mixed flow transportation of two-phase mixed flow which is easy to form scale and precipitate solid
2. the valve hemisphere with bimetal, base metal surfacing welding different alloys, the valve seat also made corresponding surfacing welding after special treatment, sealing surface combination into anti-corrosion, wear resistance, high strength and other types, to meet the needs of different occasions.
3, tight sealing, conveying harmful gas can reach zero leakage.
4, the valve core of the sealing pair has a compensation amount, when the valve do wear, turn a little when closed, any reliable seal, extend the service life. In addition, the user will screw off the pressure nut, the seat can still be used after adjustment or replacement, so as to avoid the disadvantage of scrapping the whole valve after the valve seal failure.
Use standard
Due to the surfacing of different alloy (or combination ball) bimetallic sealing pair can be used for wear resistance, corrosion resistance, high temperature resistance and strict sealing conditions
1. General valve: dn40-1600. Applicable to sewage treatment, pulp, urban heating and other requirements of the occasion
2. Special valve for oil and chemical industry: dn40-1600. Suitable for crude oil, heavy oil and other kinds of oil, chemical industry weak corrosion, two-phase mixed flow medium
3. Special gas valve: dn40-1600. Suitable for gas, natural gas, liquefied gas transmission control
4. Special valve for slurry: dn40-1600. It is suitable for industrial pipeline transportation where the chemical reaction in liquid or solid two-phase mixed flow or liquid transportation has crystallized or formed scale
5. Special valve for pulverized coal ash: dn40-1600. Suitable for power plant, hydraulic slag removal or gas conveying pipeline control
Execution standard
Design: GB12237-89
Flange connection: GB/ t17241.6-1998, GB/T9115 (steel)
Structural length: gb12221-89
Parts material
Name: material
Valve body: QT450, WCB, ZG20CrMo, ZG1Cr18Ni9Ti
Valve shaft: 2Cr13, 1Cr13
Disc: alloy nitriding steel, nitriding stainless steel, wear-resistant steel
Seat: alloy nitriding steel, nitriding stainless steel, abrasion resistant steel
Bearing: aluminum bronze, fz-1 composite material
Packing: polytetrafluoroethylene, flexible graphite
