Wear-resistant metal sealing ball and the design principle of the pneumatic valve

the coal slurry preparation system ( Pulverized coal and solvent oil blended into the primary pump) ； The coal slurry feed pressurized system ( Coal oil slurry mixture through the coal slurry pump pressure and delivery) ； Waste liquid containing solid slurry recycle and the reaction product waste recycling system; High pressure and low pressure flushing oil system ( Including pipeline flushing, flushing, instrument pneumatic valve flushing instrument itself) Some, some is to provide installation, process piping on the meter flush components; Some additives into the pipeline on the coal slurry pipeline; Besides coal slurry preparation system on pipeline, pipe flushing oil online wear-resisting ball pneumatic valve is commonly used in direct contact with the coal slurry pipeline root position. Coal transportation and coal pressurized coal-water slurry transportation pneumatic valve switch. Pulverized coal feeding switch lock hopper import and export of pneumatic valve. The feeding of lock hopper stamping and object completely dynamic valve. High pressure nitrogen pneumatic valve switch. Stove process oxygen, steam and high pressure boiler water supply switch pneumatic valve. Accident nitrogen, cooling water nozzle pneumatic valve switch. The chilling gas compressor switch pneumatic valve import and export. Cut off the syngas accident. Slag slag technology import and export of lock hopper pneumatic valve switch. Slag of lock hopper stamping and object completely dynamic valve. Pneumatic valve slag lock hopper cinder flushing switch. Ash removal technology of ash lock hopper import and export of pneumatic valve switch. The ash lock bucket stamping and object completely dynamic valve. Key points of wear-resistant pneumatic valve, high temperature resistance, working condition of the environment is generally not more than, so the auxiliary sealing adopts graphite sealing. , due to the medium containing particles, and the temperature is higher, the main sealing adopts metal seal, i. e. to wear, so the sphere and pneumatic seat for hardening treatment. Pneumatic valve structure and to ensure that the switch card to death, and pneumatic valve seat sealing surface with a knife. At the same time pneumatic seat gap between cover and body to prevent particle plugging. , working condition of material selection, corrosion resistance is higher, generally USES duplex stainless steel. Wear-resistant metal sealing ball pneumatic valve design mainly from the pneumatic valve structure and sealing surface hardening treatment two perspective for high temperature, high pressure of oxygen medium, main consideration pneumatic valve body material and the material selection, pneumatic valve body is equal to the pressure vessel, required to withstand the medium temperature, pressure and corrosion, commonly used materials, MONEL, INCONEL, main for internal parts in addition to consider the above issues considered resistant to corrosion and scouring, and for the material due to the low mechanical strength, so need to be done in the sphere surface hardening treatment such as coating nickel base alloy, hardness can achieve HRC, pneumatic valve seat adopts pneumatic surfacing STELLITE seating, HRC, which can guarantee a certain hardness between metal sealing surface is poor, is advantageous to the seal. MONEL INCONEL due to high intensity, sphere and pneumatic seat do not need to surface hardening, but the sphere and pneumatic seat choose different grades, to meet the requirements of the sealing pressure ratio. In addition, this type pneumatic valve is needed to take off the oil processing, pneumatic valves for fire prevention structure, at least in line with the API in the fourth edition for containing particles, powder medium occasions, in addition to the above problems, mainly for pneumatic valve sealing design. First of all, pneumatic seat should be scraper type pneumatic seat, besides spring cavity and bearing part of the need to consider the design of dust prevention, pneumatic valve body should have the eliminator, pneumatic valve port to be polished and hardening treatment. In addition is the sealing surface hardening treatment, HVOF WC - common ways 有限公司( To HV hardness, heat resistance by degrees, bonding strength can reach the MPA. Between the ball and seat processing is the core, and the ball and seat materials with the same key, reasonable structure design is also very important, such as pneumatic valve stem and bearing the fit between the design, the design of the pneumatic seat compression spring. Most of domestic pneumatic valve factory is mainly on the ball and the level of processing and materials need to improve.