Dec 10, 2013 · Hello,I''m trying to calculate torque for opening typical Ball Valve. I have tried to do that using SolidWorks Motion Simulation. But, nature of graph is not valid, (i.e. Torque at start is lower and end i larger) So, can anyone help me to achieve accurate results / graph?
valve. The following is the proper selection procedure. The valve sizing calculation is based on ISA. 1. Judge if the flow condition is subcritical or critical based on the given flow condition. 2. Calculate the Cv value by putting the data into an appropriate formula. 3. Select the size of the valve
torque calculation to move (to control) a butterfly valve
Aug 31, 2012 · During a case study meeting in our company it was risen the problem of the calculation of the torque to move (to control) a butterfly valve or damper installed in a pipe or duct as well what will happen on the valve disc if the control mechanism failed while the fluid is
torque again increases but to an amount less then the valve breakaway torque.This 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 0.7 for the running torque and 0.8 for the valve ending torque.
Valve Thrust/Torque Calculation Valve engineering EngTips. so ball valve will often have a MAST (max allowabe stem torque) and also BTO (Break to Open) torque required to intiate opening, RTO (Run to Open) the torque required to complete the majotity of the 90° operation and the ETO (End to Open) Torque required to fully open.
FCD MMASS0008 Ball Valve Actuator Selection Guide 3 A very large percentage of automated ball valves go into onoff service involving clean lubriing media and using TFE, hightemperature or highpressure sealing materials. For these appliions, please refer to the torque
Torque of Valves, Torque, torque values, torque valves
The torque is a function of the particular valve design and the working pressure. A ball valve with a Teflon seat ring requires less torque than the same valve body with a graphite seat ring suitable for fire rating. The manufacturer either publishes the torque or can furnish that data. The actuator torque at minimum air pressure must exceed the valve torque.
Mar 21, 2003 · Ball Valve Actuator Torque Calculations JAlton (Mechanical) (OP) 16 Mar 03 22:31. I have a Double Acting Actuator originally sized for a 4" 900# Full Port Ball Valve. I need to know if this Actuator could be used for a 3" 1500# Full Port Ball Valve. I need to use this 3" 1500# Ball Valve in a max 2000 psig/100F appliion.
How To Calculate A Torque For Butterfly Valve? Student
Sep 05, 2008 · How To Calculate A Torque For Butterfly Valve? posted in Student: Hello.I''ve got a problem. I''d like to calculate torque for butterfly valve. Data: air velocity v, pipe diameter d and pressure P. Can anyone help me?
1. This table of the torque is the valve breaking torque at maximum pressure differential, for choosing the operators.2. Formula in the table can be used to calculate the stem torques at other pressure differential. Example: calculated stem torque of DN250, PN100 valve at 70bar pressure differential.
the valve is dependent on the valve type and design, and on valve travel. A fully open ball valve behaves as an extension to the pipe and thus does not disturb the velocity profile in the way that, for instance, butterfly and globe valves do. Re V d v = ⋅
Transient Effects on Dynamic Torque for Butterfly Valves
Literature regarding the transient effects on dynamic torque for butterfly valves was not found. No documented cases of butterfly valve failures due to transients and/or dynamic torque were found in the literature search. However, failure could still be occurring and no evidence be posted publicly. It is highly likely that any valve failures
Valve Sizing Calculations (Traditional Method) 626 Technical Introduction Fisher® regulators and valves have traditionally been sized using equations derived by the company. There are now standardized calculations that are becoming accepted worldwide.
The valve stem rotates a ball which contains an opening. The ball opening can be positioned in the fully open or fully closed position but must not be used to throttle flow as any abrasive wear to the ball will cause leakage when the valve is closed. Ball valves are considered high recovery valves, having a low pressure drop and relatively high
The Pratt rubberseat ball valve fully complies with AWWA standard C507 for tightclosing, shaftmounted ball valves. It is a proven, rugged, throughport rotary valve that employs modern design techniques. The Pratt ball valve is suited to throttling and onoff service and is adaptable to a variety of control and shut off appliions.
Solon Torque Calculator Tool Use our new torque calculator web tool below to determine a calculated torque value based on inputs relative to bolt type, size, lubricant/condition and load. This userfriendly, nocost tool will provide you with a recommended Solon torque calculation and help further assist you with your Solon Belleville Spring
1. BTO values are at maximum rated differential pressure as per valve class at ambient temparature. 2. Formulas used to calculate values of below mentioned torques based on BTO value: TORQUE FORMULA VALVE CLASS RUN (Running Torque) 0.50 x BTO All ETO (End To Open) 0.70 x BTO All BTC (Break To Close) 0.85 x BTO All ETC (End To Close) 0
Ball Valve Torques and Actuator Selection Information
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 position.
BTO = Break to open (air stroke) BTC = Break to close (spring stroke) MAST = Max stem torque RTO = Running to open (air stroke) torque. VALVE/ ACTUATOR TORQUE SIZING ANALYSIS CHART FOR TRUNNION BALL VALVES PISTON STYLE SCOTCH YOKE ACTUATOR SIZING CALCULATIONS SHEET LARGER ACTUATORS 2500NM TO 17000NM SPRING RETURN (SET SPRING TO CLOSE
3 Determination of Valve Torque Standard Reduced Port Ball Valves The valve torque curves (pages 411) show the torque requirements of 1/ 4" through 10" Worcester ball valves as a function of differential pressure across the valve when the ball is in the closed position.
Calculation Sheets ( Valve Dia. Torque Calculation of Butterfly Valve 1 . Dynamic Torque (Td ) 1.3m) This torque is generated when the valve has different pressure ( AP ) between former and later of valve during the fluid which has dynamic velocity is flowing And this is not occurred when open or close of valve is completely, when an angle
Trunnion mounted ball valves are based on a system that provide a ﬁxed ball and ﬂoating seat rings, moving along the valve axis. The side load given by the pressure acting on the ball is absorbed by the bearings. At low pressure the sealing on the seats is obtained by the spring action on the seat rings. The more the pressure increase it
*Average estimating guide based on floating ball and smaller size trunnion ball valves. Large trunnion ball valves have different ratios. ELEMENTS THAT AFFECT BALL VALVE OPERATING TORQUE For a particular size and differential pressure, the torque values of soft seated ball valves
Validated Dynamic Torque Models for Kalsi Engineering, Inc.
and singleoffset butterfly valves that accurately predict torque requirements and overcome limitations of the earlier models  2. Develop torque prediction models for doubleoffset butterfly valves and other types of quarterturn ball and plug valves that are commonly used in
1.3.0 The valve torque The valve torque has several components : rubbing, hydrostatic and hydrodynamic force The figure 5 shows the typical torque vs. position curve of a pipeline ball valve There are continuous torque components due to mechanical rubbing, the break torque is calculated using the formula T= Kr+( Kp* P), where
Valve torque requirements Torque is more than meets the eye
Apr 09, 2018 · When considering the torque values to operate the valve, one must consider how much torque is required to fully open and fully close the valve. If the valve gets stuck in mid function of opening or closing the valve a safety factor must also be considered sizing the actuator.