The following chart is the flow ratio of trunnion mounted ball valve. cv indicates the gallons of water at temperature +60°F flowing through the valve bore in pressure differential down 1LBS/inch2 (0.0068694757MPA).
3 Determination of Valve Torque Standard Reduced Port Ball Valves The valve torque curves (pages 4-10) show the torque requirements of 1/ 4" through 10" Worcester Controls ball valves as a function of differ- ential pressure across the valve when the ball is in the closed position .
3.3 Design Basis Valve Stem Torque . For rotatingstem valves (ball, plug, - and butterfly), the torque needed to operate the valve is a summation of two loads: • stem torque, that is, the reaction torque in Loads not dependent on pressure or flow such as bearing loads and packing loads. • …
2 QUARTER-TURN VALVES: HEAD LOSS, TORQUE, AND CAVITATION ANALYSIS AWWA Manual M49 Coefficients provided by the quarter-turn valve manufacturer may be used to calcu-late the head loss and torque as described in this manual of standard practice, provided that the data are determined on the basis of testing methods described in chapter 5. The
Ball pressure torque. Ball tare torque. Run Torque and Valve Ending Torque. Run torque is a obtained by adding all of these values except ball tare torque. The service factor is used as a multiplier to both factors in order to estimate the required torque under actual service conditions. ... Torque Calculations Copeland ( Copeland Industries ...
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 ...
Apr 24, 2017· Ball Valve Torque Calculation ... 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 ...
The breakaway torque values listed below do not contain any service or safety factors and are adequate for the operation of Balon ball valves equipped with standard seats and used to control clean liquid or gas at ambient temperature. The run torque is approximately 50%, or one-half, of the breakaway torque.
A) An accurate maximum torque requirement must be obtained before actuator sizing begins. Normal maximum stem torque for a properly applied and maintained valve is usually defined as: The maximum starting torque required to rotate the valve element (ball, disc, plug, etc.) from a fully closed position (unsealing), against the maximum
Trunnion Mounted Ball Valve May 2011 D103258X012 TM Tartarini™ Trunnion Mounted Ball Valve Figure 1. Tartarini™ Trunnion Mounted Ball Valve Tefl on® is a mark owned by E.I. du Pont de Nemours and Co. Introduction The Tartarini Trunnion Mounted Ball Valve is …
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
FCD MMASS0008 Ball Valve Actuator Selection Guide 3 A very large percentage of automated ball valves go into on-off service involving clean lubricating media and using TFE, high-temperature or high-pressure sealing materials. For these applications, please refer to the torque …
Jan 09, 2010· There are a lot of factors that come to bear on the torque on a ball valve. The upstream pressure pushing the ball into its seat is a factor that determines the torque needed to open the valve against shut off pressure. The presence or potential for any particulates in the fluid can increase the torque requirement.
b) Ball valve with solid circular stem & rectangular cross-section at the end of stem for connection to ball-(Type B) (Valve / Actuator mounting bracket design ISO 5211 and stress calculation Not covered in this presentation). c) This guide is applicable to trunnion mounted ball valves only. d) This guide is limited to maximum allowed torque ...
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.
Oct 27, 2013· SIZING AND SELECTION OF ACTUATORS FOR VALVES 1. SIZING AND SELECTION OF ACTUATORS FOR VALVES NIDHIN MANOHAR 2. Different types of actuators Advantages & Disadvantages Selection of Actuator Sizing of Actuator Performance Tests on Actuators Force / Torque Demanded by valves S.Rammohan, CRE, Fluid Control Research Institute
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.
Ball Valves 10 Technical Data for Ball Valves Pressure/Temperature Diagrams All pressures are given in atmospheric excess pressure values. Ambient temperature max. 122°F/50°C. Safety factors for selected Thermoplastics Based on a 50 year operat-ing life at 68°F/20°C with water Material Safety factor PVC 2.5 CPVC 2.75 PVDF 2 PP 2.1 32 68 104 ...
ACTUATOR SIZING FLOATING BALL VALVES 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. of the stated torque RTO – opening torque: the torque needed to move the valve to ...
3 Determination of Valve Torque Standard Reduced Port Ball Valves The valve torque curves (pages 4-11) 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.
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