On gases and vapours the velocity at the exit of the valve body should be less than 0,33 Mach (1/3rd of sonic) for noise control valves and less than 0,5 Mach where noise is not a consideration. The material put in the stuffing box is called ______PACKING________, Q7. Control Valves Basics 1.What is CV?                                            ______PLUG________CHECK________BUTTERFLY_____  NEEDLE___________. Today we are discussed about the” top 50 boiler information booster question answers “ these question is very helpful for those who worked in power plant as a boiler first class , boiler operator , boiler fireman , boiler operation engineering , energy manager or as a energy auditor these question answers … Q24. What is the purpose of using extension bonnets ? Q25. This test comprises of 50 questions on Hydraulics and Pneumatics. _____________ valve is used to allow precise flow control. Depending on Action: Depending on action there are two types of control valves 1.  For flanged valve bodies, finish tightening them in which order? Q29. Q9. Also Read: More Control Valves Questions & Answers. A check valve is a/an: directional control valve counterbalance valve reducing valve 2. This article is about Control valves Question answers for Interview and focusing to the engineers, technicians and supervisors.You will find lot of documents related to this article. The flow control valve is a resistance … Answer : B. If possible a gate valve _____________ be used for throttling, Q8. Study the basic control valves questions and answers for your interview preparation. why control valves often are smaller than the line size. Valve geometry – inherent rangeability due to the design of the body and the regulating element 2. Refer to the Fire Protection Handbook to find answers. What are the types of check valves? Please! Just navigate our website www.paktechpoint.com and find more articles. A list of top frequently asked Control System interview questions and answers are given below.. 1) What is meant by System? __________ is one of the major causes of  dead band in a control valve assembly, Q3. Question 31. Control System Interview Questions. An example of discrete (digital) control is: a. Varying the volume of a music system b. The control valve is most often the final control element of the process industries. B. The purpose of valve packing is … In short, the control valve regularizes the flow of gas, water, steam, and chemical compounds, to compensate for the disturbance of the load. What are glandless piston valves? We can form the following groups of valves by distinguishing between their functions: The ISO-symbol tells you a valve's function. Is this statement True or False. Thanks in Advance. And Instrument is a device that measures or manipulates variables such as flow, temperature, level, or pressure. What do you mean by special purpose valves? Valves that perform duties other than the two-way isolation, control and check are called special Purpose valves. End connection means arrangement of attachment of the valve with the equipment or the piping. Must fail closed b. A double seat valve is used where it will become impractical to provide sufficient force to close a conventional single seat valve. Answer: - Isolation. Valves that perform duties other than the two-way isolation, control and check are called special purpose valves. Three way valves Review the questions again. Cv is the Valve Coefficient, and is a measure of the capacity of a valve, which takes account of its size and the natural restriction to flow through the valve.. 7. Needle valve.  In a direct acting actuator, increasing air pushes up the diaphragm and the actuator stem retracts. Q17. Q16. A control valve is a valve used to control fluid flow by varying the size of the flow … Questions discussed which is frequently asked in Interview, know about control valve parts Create a website or blog at WordPress.com, Puneet Sharma Questions on Fluid Power in Machine Tools, Hydraulic Elements in Design of Circuits, Accumulators and Intensifiers, Fluid Power in … Quiz on Chapter 10: Directional Control Valves. (In Point of Valves) Gate valve.  What is the purpose of actuator in a  control valve ? Answer all questions that you know first. Glandless piston valves are regulating valves used in steam services. Find the volumetric flow rate if the control valve has a Cv of 55. Question 6. Control Valves Questions & Answers Common Definition of CV : The Cv of a valve is the quantity of water in US gallons at 60 °F that will pass through the valve each minute with a 1 psi pressure drop across it. In automatic control terminology, a control valve is termed a "final control … Turning a lamp ON or OFF c. Varying the brightness of a lamp d. Controlling the speed of a fan 2. Enter your email address to follow this blog and receive notifications of new posts by email. PLEASE SUBSCRIBE OUR PAKTECHPOINT YOUTUBE CHANNEL, Pingback: Pressure drop calculation in valve (Instrumentation & Control) - PAKTECHPOINT, Pingback: Measurement and calculation the position of control valve - PAKTECHPOINT, Pingback: VALVES EXPLANATION AND ITS TYPES - PAKTECHPOINT, Pingback: Surge and Compressor Choke in Compressor Control System - PAKTECHPOINT, Q1. E-mail:- aws.cwi.training@gmail.com, View AWS.CWI.Training.Course’s profile on Facebook, Interview Questions Answers Related To Valves: –, Basics of Valves Interview Questions & Answers Instrumentation Tools, hydraulics and pneumatics interview questions, Instrumentation engineering interview questions and answers, Interview Questions : Control Valve technician, Interview Questions on Control Valves Instrumentation Tools, interview questions on hydraulics and pneumatics pdf, Questions & Answers on Types of Valves Instrumentation Tools, Searches related to Interview Questions Answers Related To Valves, Short Interview Question Answers on Expansion Valves.  Identify the following parts of the actuator by putting the numbers corresponding to the arrows. The valves are required so that the check valve can be isolated and serviced. 8. By “reading” the symbol correctly you get hints of how to use Q21. Globe valves single or double seated 2. This enables the direct control … Show the packing material in the figure. However, these control valves are not necessary, nor allowed, in the fire department connection piping. How can Flashing damage be contained? The Control Valve Handbook has been a primary reference since its first printing in 1965. Answer:- A. Q20. For an equal percentage control valve, the flow increases 4% for every 1% of valve movement. Regulation Globe valve. Are you searching for Control valves jobs?Then we will help you out by providing you with Control Valves Interview Question and Answers on our wisdomjobs site page.To be precise about the Control values is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. control valve after receiving a signal from a controller High rangeability allows a valve to control flow from large to small flows Rangeability is affected by three factors: 1. Q10. This interactive well control quiz contains 25 questions related to Tricky Questions and Well Control Equipment.Additionally, this content is based on both IWCF and IADC well control.  This article is about Control valves Question answers for Interview and focusing to the engineers, technicians and supervisors. Cv = 1.15 x Kv. Angle valves 3. What Is Control Valves ? Check valves are divided into two types based on check mechanism as:-A. Provide variable resistance in a piping system c. Provide tight flow shut-off d. Must modulate from fully open to fully shut e. Are nearly always reverse acting Answer: B Control Valves Interview Questions:- in this post 27 nos. Do not forget to subscribe our You tube channel also. It helps keep the process variable close to the desired point. Non-Return. There are no computations required.  For this valve, at a valve position of 50% open, flow rate is 50% of maximum. State true or false. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. When a liquid enters the valve and the static pressure at the vena contracta drops to, less than  the fluid vapor pressure (PV), and the valve outlet pressure is also less than the fluid vapor pressure, the condition is called. Top 50 Boiler Information Booster Question Answers. Hence a control system is an arrangement of different physical elements connected in such a manner so as to regulate, direct or command itself or some other system. Posts about control valve question answers pdf written by awscwitraining AWS-CWI Certification | Certified Welding Inspector Exam Training Course Eurotech an authorized Agent of American Welding Society Organizing AWS CWI, SCWI, CAWI , CWE, WI, Certification Program in these Locations: Mumbai, Chennai, Ahmedabad, …   An example of a packing material: Q14. The Kv value is the metric equivalent in m3/hr with 1 bar pressure drop. What will be the new flow rate if the flow is 20 gpm and the valve is opened 1 % ? When the number of elements connected performs a specific function then the group of elements is said to constitute a system or interconnection of various … What is normally closed? What is normally open? Is the velocity of a fluid in a control valve … The wear due to the contact friction is _____________ on the disc of a globe valve. CONTROL SYSTEMS Objective Questions and Answers pdf free download,mcqs,lab viva,online quiz bits test electrical engineering interview questions. Water flows through a 2 inch control valve with a pressure drop of  4 psi. Do not forget to subscribe our You tube channel also. Generally, the globe valves are used as the control valves. The commonly used control valves can be defined as follows: a. Swing check valve. __________ valve offers much more resistance to flow than __________ valve. Control valves a.  Name any two types of valve end connections. Valves are classified based on end connection as: –. Q13. Q15. A control valve is also required in each automatic source of supply in accordance with Section 8.16.1.1.1.2. The main purpose of a control valve positioner is to: (A) Alter the fail-safe status of the valve (B) Improve the precision of the valve (C) Alter the characterization of the valve (D) Increase transmitter accuracy (E) Eliminate cavitation in the valve. Regulation. Ball valve Plug valve. In pneumatic control systems the control valve used as final control element converts (a) pressure signal to electric signal (b) pressure signal to … Butterfly valve. 1. This entry was posted in Interview Questions and Answers, Piping Interview Questions Answers and tagged Basics of Valves Interview Questions & Answers Instrumentation Tools, control valve interview questions pdf, control valve question answers pdf, hydraulic technician interview questions, hydraulics and pneumatics interview questions …  This valve is used for On/Off applications. Special purpose. 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