ball valve required torque calculation

How to Size Pneumatic Actuators | CrossCo

A metal seated ball valve requires a large amount of torque to open or close but also has an elevated torque requirement while traveling. Some basic valve definitions you need to know are: Break Torque. Also known as Opening Torque. This is the amount of torque required to start the movement of a valve from the closed position. Running Torque

VALVE TORQUE - Islip Flow Controls

With variable torque actuators the required valve torque across the valve stroke must be examined. At the beginning of each stroke the valve torque is the largest.This is called the break torque,which are the torques outlined on the charts found on pages 27 and 28.As the ball is turned the torque

Actuator Sizing Information -

(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 …

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?

KVAP™ Valve Testing & Actuator Analysis Program - AOV/MOV ...

KVAP™ Product Description. KVAP™, the Kalsi Valve & Actuator Program, is state-of-the-art software that efficiently performs reliable design basis calculations for all common types of globe, gate, diaphragm, butterfly, ball, and plug valves as well as linear and quarter-turn actuators used in AOV and MOV applications.


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 the fully open position. Average 70% ...

Valve Types and Features

Valve Types and Features The three basic functions of valves are: 1. to stop flow, 2. to keep a constant direction of flow, and 3. to regulate the flow rate and pressure. To select the correct valve to fulfill these functions properly, an outline of the different types of valves and their features is given below. Butterfly valve

Actuator sizing calculation for Gate & Globe Valves

Actuator Sizing Calculation for Gate & Globe Valves GSL-Actuator-Sizing-Calculation R1 - AS Information required Examples 1 Bore diameter at seat (use actual diameter if known) 12 inch 3 inch 3 inch 2 Differential pressure, using 30psi minimum, and line psi if higher 200 psi 2250 psi 2250 psi

Handwheel Operators and Torque - Valve News

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 ...

Breakaway Torque Formula For All Valves - Valve ...

hello I am looking for formula to calculate required torque for following valve: Gate Glob Ball (Float and Trunnion) Or, is there any reference for selecting ma Breakaway Torque Formula For All Valves - Valve engineering - Eng-Tips

Worcester Controls Actuator Sizing Manual - Flowserve

dure for sizing actuators to Flowserve Worcester Controls ball valves . By properly sizing an actuator to a valve for a specific application, performance is guaranteed and economies are gained . Valve Torque - Before the actuator can be sized for any given valve application, the amount of torque required by the valve must be determined .

Ball Valve Torque Calculation | Sciencing

Apr 24, 2017· 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.

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.

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.


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

Technical Calculation Service | Nidec Corporation

This is Nidec's technical calculation service page. Simply by entering the values, you can easily obtain the calculation result of the load torque used when driving a ball screw.

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 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.

Control Valve Basics: Sizing and Selection - CED Engineering

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 ...

SD Series Floating Ball Valve -

SD Series Floating Ball Valve Torque Values for SD Series Product Data Sheet uly 2016 . SD Series Floating Ball Valve PRESSURE ... 3.0 Calculation of final valve torque (FBTO) for selection of gearbox or actuator 3.1 Calculated final valve torque (FBTO) based on temperature and seat material: ... 3.2.1 Maximum pull force required at the ...

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

valve disc. 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 ...

How to Select a Valve Actuator: Types, Sizing, Safety ...

Jun 17, 2019· Force refers to the torque requirement of the valve, meaning the amount of force required to move the valve from the open to the closed position. In a sliding stem valve, the force required would be a linear push-and-pull force; multi-turn or part-turn valves require a rotary force.

Bettis Actuator Sizing and Selection -

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

Ball Screw Torque Calculations - Nook Industries

Ball Screw Torque Calculations. When considering the total torque required for a given ball screw assembly, you must consider several factors. If Preload is applied to the ball screw assembly, Drag Torque is added to either the Driving Torque or Backdriving 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. Some of the factors effecting torque values include the following: Valve Design and Materials of ...

Worcester Controls -

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 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 beginning of opening.

Section Vb2: Butterfly Valves - Johnson Controls

The VF series butterfly valve product data sheets contain the necessary actuator sizing sheets. The actuator selection charts incorporate a 25% safety factor for 2 in. -12 in. sizes and 10% safety factor for 14 in. - 20 in. sizes to insure smooth trouble free operation. The amount of total torque (TT) required to modulate a butterfly valve disc

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 …

Coefficient of Hydrodynamic Torque is now available with ...

Apr 16, 2018· This is now available in all subscription plans without any additional cost. This all-new feature calculates the hydrodynamic torque coefficient and predicts the nature of the C dt curve for all types of control valves with rotary motion viz., butterfly valves, ball valves, plug valves etc.

Differences Between a Ball Valve & a Butterfly Valve ...

Differences Between a Ball Valve & a Butterfly Valve. Ball valves and butterfly valves are both quarter-turn (90-degree turn from fully opened to fully closed) rotary valves. The family of rotary valves also includes cone and plug valves. They are used to control the …

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

Mar 23, 2010· Hello, I had to calculate it some years ago and used AWWA C504 if I remember well. 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.