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ball valve required torque calculation

Maximum Allowable Stem Torque (MAST) - Piping

28/06/2014  Valve torque calculation: Assumption for the calculation: a) Ball valve with solid circular stem connection to ball by dowel pins – (Type A). 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 ...

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Ball Valve Torque Calculation Formula - Valve engineering ...

Usually torque is a measured value under known and optimal/ideal 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 torque

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Torque Values for L Series (Split Housing) Design, G ...

TORQUE TYPE FORMULA PRESSURE CLASS ETO 0.65 x BTO 150, 300, 600 ETO 0.60 x BTO 900, 1500, 2500 BTC 0.85 x BTO All ETC 0.8 x BTO All 2. For Reduced Bore Valves, take torque value corresponding to the required Ball Bore Size. Example: For NPS 14 x NPS 10 Reduced Bore Valve, consider the torque value corresponding to NPS 10. Document No.: D/BAL-002E-A

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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. 100% of the stated torque RTO – opening torque: the torque needed to move the valve to the fully open position. Average 70% of stated torque* ETO – open breakout torque ...

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CONCEPTUAL DESIGN AND ANALYSIS OF HIGH PRESSURE BALL

The torque required to operate the valve, which includes breaking torque, running torque and ending torque are calculated and compared with technical information from research case study. Key Words: PTFE, Delrin-100, Acetal, High pressure ball valve, F.O.S, strength. 1. INTRODUCTION A valve is a mechanical device which regulates either the flow or the pressure of the fluid. Its function can be ...

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Actuator Selection - Flowserve

superheated steam, can increase torque up to 25% over that required in liquid service. Ill. Torque Reduction Factors for Rack-and-Pinion Spring-Return Actuators on Soft Seated Valves. When sizing rack-and-pinion pneumatic spring return actuators, a multiplier may be applied to the published ball valve torque. The following explains why this factor is used, and how it works. The theory behind ...

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3.3 Design Basis Valve Stem Torque converted to linear ...

Ball and plug valve do not see significant stem loads caused by flow or pressure. For these valve designs, the required valve stem torque is simply the bearing load. Butterfly valves have complicated disc torque loads due to the flow over the disc at various angles of stem rotation. 3.3.1 Gate/Globe Valve Stem Torque - Stem Factor . Once the required valve stem thrust is known, the required ...

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Worcester Controls Actuator Sizing Manual

The torque required to operate a ball valve is maximum at the begin-ning of opening . This is due to the change in the ball surface that is in contact with the seats . The ball surface contact with the seats is greatest when the valve is closed . A typical ball valve torque characteristic is demonstrated in the graph shown on the left . Closing torque is about 80% of the opening or breakaway ...

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HANDWHEEL OPERATORS AND TORQUE - Valtorc

02/07/2013  Torque is expressed as force x distance to distinguish it from Energy which has the same units but is expressed as distance x force. (Example): 100 lbft Torque. 100 ftlb Energy. Valve Handwheel Torque and Rim Pull: Valves are often operated by turning a Handwheel. Operating torque is applied by pulling on the Handwheel Rim. That’s called, Rim ...

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Ball Valve Design Features Design and Engineering

30/11/2018  Seat supported design generally needs higher operating torque. Metal seated floating ball valves also incorporate spring loaded seats. Trunnion Mounted Design. The ball is fixed in position by the stem the trunnion which are supported in bearings in the body. The seat are spring loaded onto the ball, giving reliable sealing at low pressures. The key feature is that the ball does not shift as ...

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Ball Valve Torque Calculation Sciencing

24/04/2017  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 valve.

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VALVE/ ACTUATOR TORQUE SIZING ANALYSIS CHART FOR

The real valve torque value can be higher depending upon the following listed factors as these factors can drastically increase (or decrease) the torque. Please advise if any of the following factors are applicable. Approximate valve torque increases/ decreases (apply to safety factor accordingly) are:-1) Fluid carrying dust, powder, abrasive particles (+50% to 125%). In extreme cases can be ...

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Typical Valve Break Torque Figures. - NTC Valves

The "Break Torque" of a Ball Valve is the value of force required to move the Ball from either the fully open or closed position (Break Torque). The most common way of presenting this information in Europe is in Newton Metres (Nm). The greater the force required, the higher the Torque value becomes. The figures given below are based on PTFE/TFM 1600 Seat Materials being used on Clean, Cold ...

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3.3 Design Basis Valve Stem Torque converted to linear ...

Ball and plug valve do not see significant stem loads caused by flow or pressure. For these valve designs, the required valve stem torque is simply the bearing load. Butterfly valves have complicated disc torque loads due to the flow over the disc at various angles of stem rotation. 3.3.1 Gate/Globe Valve Stem Torque - Stem Factor . Once the required valve stem thrust is known, the required ...

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HANDWHEEL OPERATORS AND TORQUE - Valtorc

02/07/2013  Torque is expressed as force x distance to distinguish it from Energy which has the same units but is expressed as distance x force. (Example): 100 lbft Torque. 100 ftlb Energy. Valve Handwheel Torque and Rim Pull: Valves are often operated by turning a Handwheel. Operating torque is applied by pulling on the Handwheel Rim. That’s called, Rim ...

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SVF Valve Torque Tables - SVF

File Name: SVF_Torque_Tables_01-10-2019.pdf File Size: 340.65 KB: File Type: application/pdf: Last Updated Date: 11-12-2017

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Three-way Ball Valve, horizontal version Pfeiffer Type BR ...

Table 3 Max. permissible torque M Dmax and required breakaway torque M ... Selecting and sizing the ball valve 1. Calculate the required nominal size. 2. Determine which flow schematic is required 3. Select valve from Tables 1 and 2 4. Select the actuator 5. Select accessories Ordering text Three-way ball valve Type BR 26l/BR 26t Nominal size DN .... Nominal pressure PN .... Rotary actuator ...

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How to calculate motor drive torque for ball screws

18/05/2016  This article explains how to calculate the back driving torque. Aside from being necessary to move the load or execute the process as desired, the required motor torque also determines the amount of current needed from the servo amplifier. When current is applied to a motor, it encounters resistance and, as a result, heat is generated. This heat is commonly referred to as I 2 R losses (I ...

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Valve Sizing Calculations (Traditional Method)

A valve that is too small will not pass the required flow, and the process will be starved. An oversized valve will be more expensive, and it may lead to instability and other problems. The days of selecting a valve based upon the size of the pipeline are gone. Selecting the correct valve size for a given application requires a knowledge of process conditions that the valve will actually see ...

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Ball Valve Design Features Design and Engineering

30/11/2018  Seat supported design generally needs higher operating torque. Metal seated floating ball valves also incorporate spring loaded seats. Trunnion Mounted Design. The ball is fixed in position by the stem the trunnion which are supported in bearings in the body. The seat are spring loaded onto the ball, giving reliable sealing at low pressures. The key feature is that the ball does not shift as ...

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Typical Valve Break Torque Figures. - NTC Valves

The "Break Torque" of a Ball Valve is the value of force required to move the Ball from either the fully open or closed position (Break Torque). The most common way of presenting this information in Europe is in Newton Metres (Nm). The greater the force required, the higher the Torque value becomes. The figures given below are based on PTFE/TFM 1600 Seat Materials being used on Clean, Cold ...

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Valve torque and actuator Perfect Valve

13/04/2020  Valve torque refers to the valve the required twisting force when the valve is opened or closed, which is one of the main parameters for choosing the valve driving actuator. Close the valve between the opening and closing parts of the seat sealing surface to form a sealed pressure, but also to overcome the stem and packing, stem and nut thread, stem end support and other friction parts of the ...

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Actuated Ball Valve Selection Guide - Swagelok

40G Series Valves Valve Operating Torque Start (break) torque is the torque required to begin actuation of a valve . The actuator start torque must be greater than the valve start torque . End (run) torque is the torque required to complete the actuation . The actuator end torque must be greater than the valve end torque .

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Valve torque requirements - Torque is more than meets

09/04/2018  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.

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SVF Valve Torque Tables - SVF

File Name: SVF_Torque_Tables_01-10-2019.pdf File Size: 340.65 KB: File Type: application/pdf: Last Updated Date: 11-12-2017

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Basic Calculation of Thrust Force and Torque for Gate Valve

Calculation Sheet-1 Rev.2 Basic Calculation of Thrust Force and Torque for Gate Valve Please refer to C.Sheet-3 1. Seating and Un-seating Force without Double-block Bleed Valve. (1) For Disc Area: - 1 - f: Axial force to disc area against flow direction under the pressure. P: Pressure D: Inside diameter of the valve bore. λ:Friction angle.

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How to calculate motor drive torque for ball screws

18/05/2016  This article explains how to calculate the back driving torque. Aside from being necessary to move the load or execute the process as desired, the required motor torque also determines the amount of current needed from the servo amplifier. When current is applied to a motor, it encounters resistance and, as a result, heat is generated. This heat is commonly referred to as I 2 R losses (I ...

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Valve Sizing Calculations (Traditional Method)

A valve that is too small will not pass the required flow, and the process will be starved. An oversized valve will be more expensive, and it may lead to instability and other problems. The days of selecting a valve based upon the size of the pipeline are gone. Selecting the correct valve size for a given application requires a knowledge of process conditions that the valve will actually see ...

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Calculating a Butterfly valves torque (pls Help) - CR4 ...

23/03/2010  The torque required is the maximum of two different calculations, by one side the required to overcome the seat friction and get it tight, and the other by calculating the hydrodynamic torque produced in the disc at different angles with flow direction plus the friction on upper/lower bearings. The ΔP usually have no effects on the calculation, is flow rate (medium speed) which

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[Cam Design] Calculation of torque required by cam

21/01/2017  Over .600? valve lift: 250-280 lbs Seat pressure /100 lbs pressure for every .100? of valve lift consider this is the pressure it takes to open ONE VALVE. multiply this by 8 for a 4 cylinder engine. some designs have 4 valves per cylinder. you may want to rethink torque required to turn a bum stick.

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