22. Discharge pneumatic ball valve: the discharge pneumatic ball valve is a valve that uses a ball with a circular channel as the opening and closing part. The ball rotates with the valve stem to achieve the opening and closing action. The opening and closing part is a ball with holes, which rotates around the axis perpendicular to the channel to achieve the purpose of opening and closing the channel. It is suitable for sulfuric acid, hydrofluoric acid, phosphoric acid, chlorine, strong alkali, aqua regia and other highly corrosive media. 　　

Performance characteristics of compensator:
High temperature resistance, no powder leakage, no powder accumulation, small displacement stiffness; It can absorb arbitrary displacement, and has good flexibility to ensure the boiler and pipe system shrink freely; The device is easy to maintain, the hanger is simple, the service life is long, and the comprehensive investment is low. It is widely used in 100~600MW generating units, and basically solves the problem of coal leakage. The tetrafluoro compensator ensures the operation of the unit.
Scope of application:
It is applicable to primary air, secondary air and tertiary air pipes with pulverized coal, hot and solid two-phase fluid, flow rate of 15 〜 30m/s, working temperature of 60 ℃ - 450 ℃, and wind pressure of ≤ 500mm.
It is applicable to the pipeline system with thermal displacement request of gas-solid two-phase fluid with other solid dust and particles under pressure ≤ 0.25MPa.
The corrugated pipe of the special three-dimensional corrugated compensator for pulverized coal is made of 1Cr18Ni9Ti, and the receiver is made of low-carbon alloy wear-resistant steel, with good welding and wear-resistant properties. For corrugated compensator with nominal diameter of 450mm, wave number of 8 and compensation amount of 200mm, L is the product length.