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Classification of Valve Accessories and Materials Used

Apr 03, 2018

Valve fittings mainly include the following:


Positioner and accessories in valve accessories: pneumatic valve positioner, electric valve positioner, intelligent valve positioner, electro-hydraulic servo, servo amplifier, electrical converter, filter pressure reducing valve, valve position transmitter, and warranty Position valve, solenoid valve, limit switch, pneumatic amplifier, intelligent module, electro-hydraulic servo, servo amplifier, alarm, explosion-proof coil, quick exhaust valve.


Valve accessories include test equipment and other valve accessories: including valve testing machines, handles, handwheels, worm gears, valve bodies, valve plugs, valve stem covers, valve silencers, signal generators, blanks, dies, bolts, nuts, cards Hoops, springs, diaphragms, packing packings, O-rings, flow juices, PTFE products, gaskets, flanges, elbows, quick couplings, retractors, flow meters, filters, non-standard fasteners, Machine tools, marking machines.


The components of the actuator in the valve assembly include: pneumatic actuators, electric actuators, hydraulic actuators, gas-liquid actuators, electro-hydraulic actuators, and manual actuators.


Application materials for valve fittings include the following:


Application materials for valve fittings include copper alloys:


The grades QA19-2 and HPb59-1-1 are generally used. Suitable for low pressure valves with nominal pressure less than or equal to 1.6MPa and temperature less than or equal to 200 degrees.


The application materials for the valve fittings are carbon steel:


Generally choose A5, 35 steel, after nitriding, suitable for the nominal pressure less than or equal to 2.5MPa ammonia valve, water, steam and other media, low, medium pressure valve. And when A5 steel is suitable for temperature, it means that the valve will not exceed 300 degrees; 35 steel is suitable for the temperature not exceeding 450 degrees.


Application materials for valve fittings include alloy steel:


General use 40Cr, 38CrMoA1A, 20CrMo1V1A and other materials. After 40Cr is chrome-plated, it is suitable for mediums with water pressure, steam, and oil with nominal pressure less than or equal to 32MPa and temperature less than or equal to 450 degrees. 38CrMoA1A is nitrided and can withstand a pressure of 10MPa at a working temperature of 540°C. It is commonly used in valve fittings of power station valves.http://www.dmgcastings.com/