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Ball Valve Torques: The torque values listed in the following tables are breakaway torques from the closed position. Breakaway torques are determined by measured after the valve has been in the closed position under pressure for a set time period, and are the highest torques expected.
exposed to thrust or torque exceeding these stress limits. NOTE Typical quarter-turn valve-to-actuator interfaces are given in ISO 5211. The manufacturer shall state the maximum permissible input torque or thrust for the valve operator. If specified by the purchaser, valves shall be provided with a pressure cap.
Maximum allowable stem torque/thrust (MAST) is defined as the maximum torque/thrust that can be applied to the valve train without risk of damage, as defined by the valve manufacturer/supplier.
Jun 15, 2015· Severe service ball valve manufacturer, MOGAS Industries, is studying the impact of dynamic torque and its affect on accurate actuator sizing. At the MOGAS R&D facility, modified dynamic torque calculations are being developed to best understand the impact it has on flow conditions, pressure drops, flow rate and torque outcome.
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 the 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 begin-
Ultimately, in order to size a valve correctly one must understand what the valve is required to do, what the system parameters are, and then use this information to pick the valve that will do a proper job while keeping the economic considerations in mind. ... A typical floating ball valve seals off the line pressure using soft seats. David ...
Jan 02, 2015· Break torque usually defines the size of the gear and is the highest torque value, followed by seating torque. Run torque, the torque required while the valve is cycling, usually is the lowest torque value and is the torque used for the majority of the valve's operation. Knowing your application and safety standards is key to gear selection.
PIBIVIESSE ball valves are designed to meet the most stringent and demanding International Standards (ASME VIII, ASME B 16.34, API 6D, etc.) and, when required, the complete valve and its components can be designed and veried with any Customer requirements and with the most advanced calculation systems. Trunnion mounted balls
All Torque Values are theoretical, however where required we will torque test prior to despatch. 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.
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) 0.90 x BTO All Document No.: D/BAL-017E-A Torque Values for SD Series Product Data Sheet uly 2016
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
Sep 03, 2020· For position-seated valves the torque switch can still be used, but as over-torque protection in case there is an obstruction in the line. A torque-seated valve (e.g., gate valve) will use the torque switches to properly seat the valve at the required torque setting.
Jun 23, 2020· Rotary (Quarter-Turn) Operation – This includes plug valves, ball valves, and butterfly valves. Quarter-turn dampers would also fall into this category. These types of valves are generally easier to fit with the appropriate actuator as the operation is relatively simple, requiring a 90-degree rotation at the appropriate torque.
A ball valve consists of a valve body in which a large sphere with a central hole equal to the inside diameter of the pipe is mounted. As the ball is rotated, in the fully open position the valve provides the through conduit or full bore required for unrestricted flow of the fluid and scrapers or pigs.
This paper presents a case study of breakaway torque (break to open) calculation and actuator sizing for a full-bore ball valve in pressure Class 300 equal to 50 barg nominal pressure and 22Cr ...
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 .
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 ...
Ball Valve Torque Calculation Formula ... Seating torque, also called closing torque, is the force required to seat a valve into its closed position. Maximum shaft torque or Maximum Allowable Stem Torque (MAST) is the most force that can be applied to a stem valve before deformation occurs. Different valve types have ...
Break torque, or opening torque, refers to the force required to start moving a closed valve. Running torque, or mid-stroke torque, is the force required to maintain movement of the valve between the open and closed positions. Seating torque, also called closing torque, is the force required to seat a valve into its closed position.
(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 .
TQ-CL - TORQUE FOR WP1 TQ-CW = TORQUE FOR CWP (MAX CWP) TQ-ST = TORQUE FOR STP Note:- Kgf-m X9.807 = Nm Note:- This table is a general guide only, all figures can vary depending on trim, bonnet type, disc/wedge type, handwheel size, packing and other factors. It should be used for estimation purposes only as specifications can and do change.
alignment may increase required torque. Because of the nature of synthetic seal materials used in ball valves, the torque values are not constant. Conditions such as pressure, temperature, type of fluid, amount and kind of suspended material in the fluid, and frequency of operation all affect the torque .
The torque required to operate a ball valve is a function of friction between the valve's metal parts and its soft sealing materials. The friction points in a floating ball valve are the stem and the ball/seat. Stem torque When tightening the stem nut to compress the stem sealing, the friction between the stem assembly parts is increased, which
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 ...
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