Usually torque is a measured value under known and optimalideal conditions For a single ball valve experienced torque can vary from an observed ideal torque up to about double or triple value over time This is the reason that reliable producers set a limits for operational values when giving out a torqueGet Price
Feeding Granularity: ≤20-≤25mm
Applied Materials: Limestone, calcite, barite, dolomite, potassium feldspar, marble, talcum, gypsum, kaolin, bentonite, medical stone, rock phosphate, manganese ore, iron ore, copper ore, gold ore,quartz, active carbon, carbon black, ceramic, coal, etc.
Applicable Range: Cement, silicate product, new building material, refractory material, fertilizer, black and non-ferrous metal ore dressing and glass ceramics production industry, etc.
Feeding Granularity: 0.03-1mm
Production Capacity: 2-40TPH
Applicable Range: Suitable for separating materials with 0.3-0.02 mm particle size, such as iron ore, ilmenite, chromite, pyrite, zircon, rutile, monazite, Phosphorus, tungsten, tin, tantalum, niobium, rare metals, non-metallic minerals
Applied Materials: Feldspar, calcite, talc, barite, fluorite, rare earth, marble, ceramics, bauxite, manganese, phosphate rock, etc.
Application Area: Building materials, chemicals, fertilizer, metallurgy, mining, refractory, ceramic, steel, thermal power, coal, etc.
Production Capacity: 2-36TPH
Feeding Granularity: Φ1.5×15m-Φ3.3×40m
Technical Features: Cooling the clinker (1000-1300℃) discharged from rotary kiln to below 200℃ and improving the quality and grinding ability of the clinker.
Processing Capacity: 10-30TPH
Applied Materials: Slag, blast furnace slag, fly ash, cinder, slag, carbide slag, limestone, clay, sand, quartz sand, etc.
Input Size: ≦10mm
Diamond reserves and production of South Africa are in the front rank of the world. Large-scale development and utilization of diamonds result in production of a large number of diamond wastes. Resource utilization of diamond waste can turn waste into treMore Detail
The 700t/d Gold Concentration Plant in Sudan is designed by Henan Fote Heavy Machinery Co., Ltd. Fote Machinery has provided the whole service including ore beneficiation test, plant design and construction drawing design, complete equipment manufacture aMore Detail
For the torque value required to turn a floating ball valve through its 90° travel consider torque requirements at these five basic positions BTO – break open torque the torque required to unseat the closed valve 100 of the stated torque RTO – opening torque the torque needed to move the valve to the fully open position Average 70More Detail
FCD MMASS0008 Ball Valve Actuator Selection Guide 3 A very large percentage of automated ball valves go into onoff service involving clean lubricating media and using TFE hightemperature or highpressure sealing materials For these applications please refer to the torqueMore Detail
valve design elements and their role in predicting torque head loss and cavitation Valve torque is calculated to allow proper actuator sizing and to provide assur ance that the valve components can withstand the internal forces produced by flowingMore Detail
The torque requirement of a ball valve can be calculated from its breakaway torque and dynamic torque Breakaway Torque Breakaway torque – the turning moment required to move the ball from rest – can be calculated from the formula Tb A ΔP B ΔP represents the pressure drop across the valve and A and B are constants determined by the type and size of ball valveMore Detail
determining the actual ball valve torques to be used for actuator selection The following pages contain valve torque tables for the various Sharpe Valve models along with Media and Service Factors which must be considered Ball Valve Torques The torque values listed in the following tables are breakaway torques from the closed positionMore Detail
Valve torque is also a function of the media flowing through the valves Abrasive media have a tendency to increase the amount of friction between the ball and seats whereas some light oils which provide additional lubricity can reduce the amount of torque required The torque required to operate a ball valve is maximum at the beginMore Detail
Calculation 3B Maximum allowable stem torque in Circular section with opposite flattened side Calculation 4 Maximum allowable torque on Stem keys Where a width key L length key n number key r stem radius b groove key Where a L r b in mm and Mc in Nm Valve MAST Min MC1 MC2 MC3 MC4More Detail
This paper provides a formula for calculation of MAST in different sections of a valve stem installed on an oil export pipeline the torque required to break the Operating torque in ballMore Detail
torque again increases but to an amount less then the valve breakaway torque is known as the valve ending torque Due to the variable operating torque of a ball valve when scotch yoke type or spring return actuators are used IFC recommends factoring the breakaway torque by 07 for the running torque and 08 for the valve ending torqueMore Detail