calculating torque of ball valve


Ball Valve Calculation | Valve | Nut (Hardware)

torque wrench. Tightening torque wrench uses the standard The basics of operating torque and ball valves were torque values as per the size of ball valves. The tightening presented in this paper. Each ball valve requires minimum torque wrench is set to the standard torque value for the torque …

Actuator Sizing Information - thraco.com

(2) Bearing Torque - The torque required to overcome friction forces on the valve shaft bearing surfaces (3) Dynamic Torque - Torque due to fluid forces which tend to close the valve. The torques for resilient seated valves tabulated in this section are the sum of (1) and (2) above for various shutoff pressures.

Valve Thrust/Torque Calculation - Valve engineering - Eng-Tips

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.

Maximum Allowable Stem Torque (MAST) - Piping engineering

MAST (Maximum Allowable Stem Torque) We know ball valves (rotary valves) are used as ESDVs/BDVs in critical services like shutdown, isolation and blow down application.. As an engineer we always ensure reliability and integrity of actuator and its components. However as far as stem components are concerned we either give little attention to mechanical integrity of stem or sometimes …

VALVE/ ACTUATOR TORQUE SIZING ANALYSIS CHART FOR …

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 ...

Trunnion Ball Valve Actuator, Standards and Specifications

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.

Actuator Selection - Flowserve

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 charts on pages 4 …

How To Calculate A Torque For Butterfly Valve? - Student ...

Sep 05, 2008· Valve maunufacturers supply tables of required torques for their valves. The torque varies between manufacturers and styles of valves and I would never try to calculate it with a generic method. Request the table from your supplier.

Worcester Controls Actuator Sizing Manual - Flowserve

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 .

Actuator Sizing, Standards and Specifications for Floating ...

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.

CONCEPTUAL DESIGN AND ANALYSIS OF HIGH PRESSURE …

other factors. The design calculation is done for sealing cup, ball, connection adaptor, valve housing and operating lever. The maximum stress and deflection is calculated for different sealing cup materials under high pressure. The torque required to operate the valve, which includes breaking torque, running torque …

Ball Valve Torque Calculation | Sciencing

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.

Handwheel Operators and Torque - Valve News

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 Pull. The amount of applied torque depends on the Rim Pull and the Handwheel size. Applied torque = Rim Pull x …

Intelligent diagnostics for pipeline valves

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

Smart Solutions. Powerful Products.

Trunnion Supported Ball Valves Smart Solutions. Powerful Products. Licensed for manufacture in accordance with API 6A-0383 and API 6D-0129 and fire tested to API 6FA and 607 ... To calculate torque at any pressure use the formula located under Class for each valve size.

Worcester Controls - Medina Supply Inc, Pipe, Valves ...

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.

SIZING AND SELECTION OF ACTUATORS FOR VALVES

SIZING AND SELECTION OF ACTUATORS FOR VALVES NIDHIN MANOHAR ... BASIC FUNCTIONS Provide enough thrust/ torque to operate the valve Hold the valve gate / plug / disc / ball in required position Operate the valve through its full travel at rated speed Provide fail safe mode in the event of power failure Prevent excessive forces under unfavorable ...

Actuated Ball Valve Selection Guide - Swagelok

Actuated Ball Valve Selection Guide, ISO 5211-Compliant Actuator Mounting Bracket Kits 3 ACTUATED (68.9, 6.89) BALL VALVE SELECTION Calculating Operating Torque 1 . Select the base start and base end torque at system pressure from Table 1 . 2 . Select the temperature factor from Table 2 . 3 . Select the media factor from Table 3 . 4 .

How I can calculate the cv of a ball valve | Physics Forums

Sep 19, 2007· How I can calculate the cv of a ball valve Sep 18, 2007 #1. gabriel. Hi! I am working with ball valves and I need to calculate the cv for several sizes. I only knows the pressure drop expressed in terms of the "equivalent feet". Unfortunally, I do not have a lab to measure.

How to calculate the torque of a forged steel ball valve ...

The torque calculation of the forged steel ball valve is as follows: the square of the valve diameter of the one-half of the valve is 3.14, which is the area of the valve plate, and then the static pressure accepted by the shaft is obtained by the pressure of the stainless steel ball (ie the working pressure of the valve).

Copeland

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.

NUMERICAL ANALYSIS OF BUTTERFLY VALVE-PREDICTION …

Hydrodynamic torque T(α) is the valve shaft produced by the flow passing through the valve at a given valve opening angle α. The hydrodynamic torque coefficient Ct is a factor, which is independent of the size of the valve. For a given valve and valve opening, it is easy to calculate the hydrodynamic flow torque by using Ct times the

online ball valve torque calculation - BINQ Mining

Nov 05, 2012· Ball valve, Torque Calculation – Eng-Tips Forums. 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 … »More detailed

Breakaway torque calculations for a ball valve?

There are different frictions in the ball valve aganist openning torque which are packing friction, seat friction and unballanced forces. ... errors in the theoretical calculation of gun firing ...

Ball Valve Torques and Actuator Selection Information

Ball Valve Torques and Actuator Selection Information . EB-2001 ... 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 ... Ball Valve Torques: The torque values listed in the following tables are breakaway torques from the closed ...

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

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. • …

Trunnion Mounted Ball Valve Cv Valve and Torque ...

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 …

Torque required to open valve | SOLIDWORKS Forums

Dec 05, 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?

How to Size Pneumatic Actuators | CrossCo

For example, a metal seated butterfly valve requires a large amount of torque to break or close and very little torque while traveling between the two positions. A metal seated ball valve requires a large amount of torque to open or close but also has an elevated torque requirement while traveling.

Valve Types and Features

Valve Types and Features Valve Sizing Procedures Cv Value Calculation Conversion Formula for Reference ... Butterfly valve and globe valve Butterfly valve and ball valve Butterfly valve and gate valve ... valve. The following is the proper selection procedure. The valve sizing calculation is based on ISA. 1. Judge if the flow condition is ...

Breakaway torque for Trunnion Ball valve, different seat ...

Torque on a trunion ball valve is a function of: (1) stem packing adjustment; (2) spring tension on the seats; (3) coefficient of sliding friction between the ball and the seating material; (4) trunion bearing friction; and (5) dP across the valve.

ISSN: 2278 7798 International Journal of Science ...

This paper consist of design & analysis of trunnion mounted ball valve. The project work consist of verification of design of ball component of ball valve. ... Valve Torque ′ = 1639 ... component is achieved through numerical calculation, analysis and experimentation 2. Standard industrial practice of selection of ball diameter is