# Valves **URL:** https://forumautomation.com/c/field-instrumentation/valves/42.md?page=2 [Latest](https://forumautomation.com/latest.md) · [Categories](https://forumautomation.com/categories.md) · [Tags](https://forumautomation.com/tags.md) **Page:** 3 --- ## [How do we read a valve symbol?](https://forumautomation.com/t/how-do-we-read-a-valve-symbol/10920)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 0\ **Last updated:** [March 2, 2023, 3:52am UTC](https://forumautomation.com/t/how-do-we-read-a-valve-symbol/10920 "2023-03-02T03:52:34Z")
To direct oil into various hydraulic system circuits, directional control valves are employed. The first factors to take into account are the maximum flow capacity and the pressure drop through the valve. Directional … --- ## [How to perform a pressure test for valves?](https://forumautomation.com/t/how-to-perform-a-pressure-test-for-valves/2484)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [October 20, 2017, 6:36pm UTC](https://forumautomation.com/t/how-to-perform-a-pressure-test-for-valves/2484 "2017-10-20T18:36:16Z")
A pressure test is performed to ensure that the packing is sealed perfectly so that there cannot be any leakage through the valve. For a control valve, a small amount of leakage is allowed as they move up and down, for … --- ## [Function of valve positioners - where we use a valve positioners?](https://forumautomation.com/t/function-of-valve-positioners-where-we-use-a-valve-positioners/3583)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [May 7, 2018, 5:42pm UTC](https://forumautomation.com/t/function-of-valve-positioners-where-we-use-a-valve-positioners/3583 "2018-05-07T17:42:06Z")
What are valve positioners? Positioners are used to allow the final control element to fully perform its function in the control loop. They put the valve in the correct position by increasing or decreasing the air load… --- ## [What is a Piston Valve?](https://forumautomation.com/t/what-is-a-piston-valve/10978)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 0\ **Last updated:** [March 17, 2023, 1:58pm UTC](https://forumautomation.com/t/what-is-a-piston-valve/10978 "2023-03-17T13:58:20Z")
How do piston valves work? Piston valves are utilized as shut-off and regulating systems in the hot water and steam services. They are generally offered with globe-shaped body variants. A piston valve’s capacity to se… --- ## [How to License & setup the emerson valve link express software](https://forumautomation.com/t/how-to-license-setup-the-emerson-valve-link-express-software/2961)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [January 12, 2018, 7:01pm UTC](https://forumautomation.com/t/how-to-license-setup-the-emerson-valve-link-express-software/2961 "2018-01-12T19:01:54Z")
\##What is valve link software? A Field valve link software is useful for a technician to monitor the valve operation status and performance online to improve reliability by spotting problems before they affect your pr… --- ## [Check valves - types](https://forumautomation.com/t/check-valves-types/4499)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [August 29, 2018, 2:55pm UTC](https://forumautomation.com/t/check-valves-types/4499 "2018-08-29T14:55:13Z")
What are Check valves? Check valves or Backflow Prevention Valves or Non-return valve are valves which allow fluid to flow in only one direction. These valves are activated by fluid pressure in the channel. When the pass… --- ## [What is the difference between flashing and cavitation in control valve?](https://forumautomation.com/t/what-is-the-difference-between-flashing-and-cavitation-in-control-valve/11210)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 0\ **Last updated:** [June 2, 2023, 5:01am UTC](https://forumautomation.com/t/what-is-the-difference-between-flashing-and-cavitation-in-control-valve/11210 "2023-06-02T05:01:14Z")
Cavitation is a condition in which the internal pressure of the liquid eventually drops below the vapour pressure, leading to the creation of vapor bubbles. After this, the pressure begins to increase above the vapor… --- ## [Basics of Pinch valves working and advantages and disadvantages](https://forumautomation.com/t/basics-of-pinch-valves-working-and-advantages-and-disadvantages/3205)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [February 27, 2018, 5:53pm UTC](https://forumautomation.com/t/basics-of-pinch-valves-working-and-advantages-and-disadvantages/3205 "2018-02-27T17:53:45Z")
A pinch valve is a simplest valve design. It is a linear motion valve that is used to start, regulate and stop fluid flow. It uses a rubber tube (pinch tube) to control the fluid. Pinch valves are suitable for on-off… --- ## [What is Air manifold or Distribution manifold?](https://forumautomation.com/t/what-is-air-manifold-or-distribution-manifold/6001)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [February 28, 2019, 3:09pm UTC](https://forumautomation.com/t/what-is-air-manifold-or-distribution-manifold/6001 "2019-02-28T15:09:12Z")
Air manifolds or also called as distribution manifolds are single pipeline with several valves outputs designed to distribute air or steam to several outputs, such as steam flow meters, pressure controllers and valve pos… --- ## [How to install Valve and Actuators for HVAC system?](https://forumautomation.com/t/how-to-install-valve-and-actuators-for-hvac-system/7633)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [December 31, 2019, 12:34pm UTC](https://forumautomation.com/t/how-to-install-valve-and-actuators-for-hvac-system/7633 "2019-12-31T12:34:25Z")
This topic set a clear and specified procedure for selecting and installing the appropriate control valve in the correct position in the HVAC system. Installation of Control valve and actuators: The following procedu… --- ## [Difference Between API and ASME Pressure Safety Valve](https://forumautomation.com/t/difference-between-api-and-asme-pressure-safety-valve/6997)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [August 19, 2019, 8:33pm UTC](https://forumautomation.com/t/difference-between-api-and-asme-pressure-safety-valve/6997 "2019-08-19T20:33:11Z")
Two distinct terms have been indicated, namely API and ASME PSV, which generally confuses young engineers. It is sometimes referred to as an API region, ASME area, real area, etc. So what’s the distinction between this A… --- ## [Actuator maintenance](https://forumautomation.com/t/actuator-maintenance/4084)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [July 12, 2018, 4:34pm UTC](https://forumautomation.com/t/actuator-maintenance/4084 "2018-07-12T16:34:31Z")
At the same time as the restoration of the valve, it is necessary to maintain the actuator of the valve. Each of the main components will be repaired according to the manufacturer’s guidelines or replaced. The proof of… --- ## [Control Valve Classification - Based on Motion](https://forumautomation.com/t/control-valve-classification-based-on-motion/388)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [April 11, 2015, 5:40pm UTC](https://forumautomation.com/t/control-valve-classification-based-on-motion/388 "2015-04-11T17:40:48Z")
Control Valve Classification Based on motion we can classify the control valve in to two Categories Linear Motion Rotary Motion Linear Motion - Three types a)Globe b)Diaphragm c)Pinch Globe valves are categorized a… --- ## [What are the control valve flow characteristics?](https://forumautomation.com/t/what-are-the-control-valve-flow-characteristics/957)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [April 3, 2016, 8:04pm UTC](https://forumautomation.com/t/what-are-the-control-valve-flow-characteristics/957 "2016-04-03T20:04:48Z")
Control Valve Flow Characteristics Linear - Flow is directly proportional to lift at constant pressure drop. Equal Percentage - Flow changes by a constant percentage of its instantaneous value for each unit change lift… --- ## [Control valve sizing](https://forumautomation.com/t/control-valve-sizing/3056)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [January 30, 2018, 6:25pm UTC](https://forumautomation.com/t/control-valve-sizing/3056 "2018-01-30T18:25:26Z")
Why is it needed for control valve sizing? Valves must be sized correctly to perform the control as desired. Undersized valves cannot deliver sufficient quantities for maximum load conditions, and oversized valves atte… --- ## [Explain about control valve accessories](https://forumautomation.com/t/explain-about-control-valve-accessories/2205)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [August 15, 2017, 12:54am UTC](https://forumautomation.com/t/explain-about-control-valve-accessories/2205 "2017-08-15T00:54:16Z")
Valve Accessories 1.I/P Transducer Transducers convert a current signal to a pneumatic signal.The most common transducer converts a 4-20 ma electric signal to a 3-15 psig pneumatic signal. 2.Volume Booster Volume boo… --- ## [Rotary Valves configurations](https://forumautomation.com/t/rotary-valves-configurations/3652)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [May 20, 2018, 5:44pm UTC](https://forumautomation.com/t/rotary-valves-configurations/3652 "2018-05-20T17:44:04Z")
A rotational control valve controls the passage of fluid by regulating the passages in a transverse plug. The rotary valve is an obvious configuration, although not widely used. It can be classified as a type of spool va… --- ## [Step by step procedure for Actuator installation](https://forumautomation.com/t/step-by-step-procedure-for-actuator-installation/6555)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [June 14, 2019, 5:13pm UTC](https://forumautomation.com/t/step-by-step-procedure-for-actuator-installation/6555 "2019-06-14T17:13:55Z")
Installing an actuator is a simple process, but it should be done with extreme care for the better working of the control valve. These are the couple of very important steps to follow: Step 1: Remove the stem button… --- ## [What is Solenoid valve and How it is used?](https://forumautomation.com/t/what-is-solenoid-valve-and-how-it-is-used/10598)
**Author:** [@Ajmal\_ismail](https://forumautomation.com/u/Ajmal_ismail)\ **Replies:** 0\ **Last updated:** [August 22, 2022, 5:07am UTC](https://forumautomation.com/t/what-is-solenoid-valve-and-how-it-is-used/10598 "2022-08-22T05:07:58Z")
Solenoid valves are electromechanical devices that control fluid flow in a variety of applications. They are used in a variety of applications to release, shut off, mix, or dose liquid and gas media. These devices make m… --- ## [Common symbols used for Direction Controlled Valves](https://forumautomation.com/t/common-symbols-used-for-direction-controlled-valves/2654)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [November 15, 2017, 8:11pm UTC](https://forumautomation.com/t/common-symbols-used-for-direction-controlled-valves/2654 "2017-11-15T20:11:36Z")
Before going to the symbol of the valves, The switching position, flow direction, and port for different configurations are to be understood. Arrow represents the flow direction Closed position Two position valve … --- ## [Double seated control valve](https://forumautomation.com/t/double-seated-control-valve/108)
**Author:** [@instrumen](https://forumautomation.com/u/instrumen)\ **Replies:** 1\ **Last updated:** [September 23, 2017, 8:49am UTC](https://forumautomation.com/t/double-seated-control-valve/108 "2017-09-23T08:49:39Z")
It is a control valve whose trim (plug and seat) has two seats (contact points). A double seated control valve is commonly used in high differential, huge capacity, turbulent flow lines. --- ## [How to select control valve for various industries?](https://forumautomation.com/t/how-to-select-control-valve-for-various-industries/10511)
**Author:** [@Ajmal\_ismail](https://forumautomation.com/u/Ajmal_ismail)\ **Replies:** 0\ **Last updated:** [July 5, 2022, 4:04am UTC](https://forumautomation.com/t/how-to-select-control-valve-for-various-industries/10511 "2022-07-05T04:04:34Z")
Control valves are essential in many process industries. They are intended to regulate the flow of fluids in a system. They are intended to initiate and stop the process as well as throttle the fluid flow to ensure effic… --- ## [What is the use of air lock relay](https://forumautomation.com/t/what-is-the-use-of-air-lock-relay/9157)
**Author:** [@instrumentationtechi](https://forumautomation.com/u/instrumentationtechi)\ **Replies:** 1\ **Last updated:** [February 12, 2021, 10:58am UTC](https://forumautomation.com/t/what-is-the-use-of-air-lock-relay/9157 "2021-02-12T10:58:56Z")
What is the need for air lock relay --- ## [Do you know of any software used for sizing control valves?](https://forumautomation.com/t/do-you-know-of-any-software-used-for-sizing-control-valves/12156)
**Author:** [@Sundar\_Iyalunaidu](https://forumautomation.com/u/Sundar_Iyalunaidu)\ **Replies:** 1\ **Last updated:** [June 15, 2024, 12:44pm UTC](https://forumautomation.com/t/do-you-know-of-any-software-used-for-sizing-control-valves/12156 "2024-06-15T12:44:17Z")
Do you know of any software used for sizing control valves? --- ## [Control valve leakage protection Part 2 - for Butterfly valve, Globe valve & Gate valve](https://forumautomation.com/t/control-valve-leakage-protection-part-2-for-butterfly-valve-globe-valve-gate-valve/4456)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [August 24, 2018, 12:46pm UTC](https://forumautomation.com/t/control-valve-leakage-protection-part-2-for-butterfly-valve-globe-valve-gate-valve/4456 "2018-08-24T12:46:31Z")
Leakage protection for Butterfly valve: Proper operation and periodic troubleshooting of the butterfly valve can extend service life. Generally, repairs can be done in inline conditions. Leakage on piping flanges is… --- ## [Control valve Step Open and Step Closed Test analysis](https://forumautomation.com/t/control-valve-step-open-and-step-closed-test-analysis/4099)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [July 14, 2018, 12:23pm UTC](https://forumautomation.com/t/control-valve-step-open-and-step-closed-test-analysis/4099 "2018-07-14T12:23:43Z")
Step open and step closed test are used to determine the stroke time of the valve and which components restrict the valve’s movement. If the air pressure upstream of the positioner drops significantly, this would be an … --- ## [What standard can i use to calculate the right place to put a control valve in a pipeline?](https://forumautomation.com/t/what-standard-can-i-use-to-calculate-the-right-place-to-put-a-control-valve-in-a-pipeline/158)
**Author:** [@instrulover](https://forumautomation.com/u/instrulover)\ **Replies:** 1\ **Last updated:** [November 28, 2014, 2:40am UTC](https://forumautomation.com/t/what-standard-can-i-use-to-calculate-the-right-place-to-put-a-control-valve-in-a-pipeline/158 "2014-11-28T02:40:25Z")
what standard can i use to calculate the right place to put a control valve in a pipeline? --- ## [Process Instrumentation - Pressure relief Devices](https://forumautomation.com/t/process-instrumentation-pressure-relief-devices/233)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [January 13, 2015, 6:02am UTC](https://forumautomation.com/t/process-instrumentation-pressure-relief-devices/233 "2015-01-13T06:02:04Z")
Pressure relief devices is actuated by Inlet static pressure. Purpose of pressure relief is device is to open to during an emergency or abnormal condition to prevent a rise of internal fluid pressure in excess of a speci… --- ## [Pressure relief valves different tests](https://forumautomation.com/t/pressure-relief-valves-different-tests/4450)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [August 23, 2018, 5:09pm UTC](https://forumautomation.com/t/pressure-relief-valves-different-tests/4450 "2018-08-23T17:09:15Z")
Safety valve or pressure relief valve has a vital role in a factory/industry, safety valves release automatically the excess pressure if it has reached its setting value so as not to endanger the equipment, workers and t… --- ## [How to identify valves using their P&ID symbols?](https://forumautomation.com/t/how-to-identify-valves-using-their-p-id-symbols/4567)
**Author:** [@rajeena](https://forumautomation.com/u/rajeena)\ **Replies:** 0\ **Last updated:** [September 6, 2018, 4:25pm UTC](https://forumautomation.com/t/how-to-identify-valves-using-their-p-id-symbols/4567 "2018-09-06T16:25:45Z")
How to identify valves using their P&ID symbols? A Pipeline and Instrumentation Diagram (P & ID) is a graphical representation of a process system that includes pipes, vessels, control valves, instrumentation, and other … --- ## [6 Types of ball Valves](https://forumautomation.com/t/6-types-of-ball-valves/6968)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [August 15, 2019, 3:07pm UTC](https://forumautomation.com/t/6-types-of-ball-valves/6968 "2019-08-15T15:07:08Z")
What are ball valves? The ball valve is a rotational motion valve, which consists of globe-shaped disk that rotates to open and close the valve opening. The ball has a hole or port through the center so that flow wil… --- ## [Different ways to detect Valve position:](https://forumautomation.com/t/different-ways-to-detect-valve-position/7057)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [August 29, 2019, 8:55pm UTC](https://forumautomation.com/t/different-ways-to-detect-valve-position/7057 "2019-08-29T20:55:16Z")
Technicians working related to control valve should know about the exact position of control valve. For certain valves, an indication of the exact position of the valve is given in the form of position lights indicati… --- ## [How to install and maintain Butterfly valve?](https://forumautomation.com/t/how-to-install-and-maintain-butterfly-valve/7548)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [December 11, 2019, 7:14pm UTC](https://forumautomation.com/t/how-to-install-and-maintain-butterfly-valve/7548 "2019-12-11T19:14:02Z")
Butterfly valves are pivoting disk valves that control flow used in both heavy and light uses. The circular disk or plate is positioned precisely in the middle of the tube, perpendicular to the direction of the curren… --- ## [Pilot operated Pressure relief valve](https://forumautomation.com/t/pilot-operated-pressure-relief-valve/4442)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [August 22, 2018, 7:22pm UTC](https://forumautomation.com/t/pilot-operated-pressure-relief-valve/4442 "2018-08-22T19:22:43Z")
Pilot operated valve is a type of pressure relieving devices, where the valve is mainly controlled by a “self-actuated” pressure relieving valve. The pilot operated valve consists of two parts, namely the pilot valve… --- ## [How to choose Control Valve Actuators?](https://forumautomation.com/t/how-to-choose-control-valve-actuators/7011)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [August 21, 2019, 6:58pm UTC](https://forumautomation.com/t/how-to-choose-control-valve-actuators/7011 "2019-08-21T18:58:28Z")
There are various types of actuators available in the market. The quality of control valve depends on the material used and the machining, while the perfomance depends on the actuators used. To make the best techni… --- ## [What are the regular problems occured by control valves in maintainance](https://forumautomation.com/t/what-are-the-regular-problems-occured-by-control-valves-in-maintainance/245)
**Author:** [@AKSHAY](https://forumautomation.com/u/AKSHAY)\ **Replies:** 1\ **Last updated:** [February 15, 2015, 4:01pm UTC](https://forumautomation.com/t/what-are-the-regular-problems-occured-by-control-valves-in-maintainance/245 "2015-02-15T16:01:53Z")
can any one give a brief about it. thanks in advance --- ## [Direct acting and Reverse acting control valve](https://forumautomation.com/t/direct-acting-and-reverse-acting-control-valve/110)
**Author:** [@instrumen](https://forumautomation.com/u/instrumen)\ **Replies:** 0\ **Last updated:** [October 3, 2014, 12:59pm UTC](https://forumautomation.com/t/direct-acting-and-reverse-acting-control-valve/110 "2014-10-03T12:59:56Z")
Direct acting control valve : The valve port closes on air failure. Reverse acting control valve: The valve ports on an air failure. --- ## [Can a high pressure valve be substituted for a lower pressure valve?](https://forumautomation.com/t/can-a-high-pressure-valve-be-substituted-for-a-lower-pressure-valve/1282)
**Author:** [@automate](https://forumautomation.com/u/automate)\ **Replies:** 1\ **Last updated:** [August 27, 2016, 11:47pm UTC](https://forumautomation.com/t/can-a-high-pressure-valve-be-substituted-for-a-lower-pressure-valve/1282 "2016-08-27T23:47:42Z")
Is it possible to use a high pressure valve instead low pressure valve? --- ## [Control valve leakage protection Part 1- for Plug valve and Ball valve](https://forumautomation.com/t/control-valve-leakage-protection-part-1-for-plug-valve-and-ball-valve/4448)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [August 23, 2018, 10:13am UTC](https://forumautomation.com/t/control-valve-leakage-protection-part-1-for-plug-valve-and-ball-valve/4448 "2018-08-23T10:13:42Z")
Good care must be given to control valve to reduce the problems that may be possible repairs and leakage without shutting down the system when not harmful. If in a dangerous position then the repair of the valve must be … --- ## [What is Protective Relay and its Types?](https://forumautomation.com/t/what-is-protective-relay-and-its-types/9829)
**Author:** [@Ajmal\_ismail](https://forumautomation.com/u/Ajmal_ismail)\ **Replies:** 0\ **Last updated:** [September 6, 2021, 12:50pm UTC](https://forumautomation.com/t/what-is-protective-relay-and-its-types/9829 "2021-09-06T12:50:36Z")
What is Protective Relay? A protecting relay is an automatic electric component designed to experience a circuit breaker while a fault is detected. The first protecting relays were electromagnetic devices, relying on co… --- ## [What is the difference between flashing and cavitation?](https://forumautomation.com/t/what-is-the-difference-between-flashing-and-cavitation/12096)
**Author:** [@Sundar\_Iyalunaidu](https://forumautomation.com/u/Sundar_Iyalunaidu)\ **Replies:** 1\ **Last updated:** [May 30, 2024, 8:11pm UTC](https://forumautomation.com/t/what-is-the-difference-between-flashing-and-cavitation/12096 "2024-05-30T20:11:53Z")
What is the difference between flashing and cavitation? --- ## [What does it mean if a valve is passing?](https://forumautomation.com/t/what-does-it-mean-if-a-valve-is-passing/13361)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [July 12, 2025, 4:58am UTC](https://forumautomation.com/t/what-does-it-mean-if-a-valve-is-passing/13361 "2025-07-12T04:58:46Z")
What does it mean if a valve is passing? --- ## [Can we use a control valve without positioner and what are the uses of control valve with positioner?](https://forumautomation.com/t/can-we-use-a-control-valve-without-positioner-and-what-are-the-uses-of-control-valve-with-positioner/11216)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 0\ **Last updated:** [June 6, 2023, 7:30am UTC](https://forumautomation.com/t/can-we-use-a-control-valve-without-positioner-and-what-are-the-uses-of-control-valve-with-positioner/11216 "2023-06-06T07:30:02Z")
Can we use a control valve without positioner ? Yes, it is possible to use a control valve without a positioner. A control valve is a crucial component in industrial processes that regulates the flow, pressure, or leve… --- ## [How to troubleshoot On-Off / Shutdown Valve?](https://forumautomation.com/t/how-to-troubleshoot-on-off-shutdown-valve/11888)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 1\ **Last updated:** [March 21, 2024, 4:48pm UTC](https://forumautomation.com/t/how-to-troubleshoot-on-off-shutdown-valve/11888 "2024-03-21T16:48:50Z")
--- ## [What is a delay valve ? Application, Advantages and Disadvantages](https://forumautomation.com/t/what-is-a-delay-valve-application-advantages-and-disadvantages/10830)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [January 8, 2023, 2:17pm UTC](https://forumautomation.com/t/what-is-a-delay-valve-application-advantages-and-disadvantages/10830 "2023-01-08T14:17:39Z")
What is delay valve? A delay valve is a type of valve that is used to control the flow of fluids in a system. It works by introducing a delay in the flow of fluid through the valve, which allows the pressure in the syst… --- ## [Installation and maintenance of strainers](https://forumautomation.com/t/installation-and-maintenance-of-strainers/7229)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [October 3, 2019, 3:43pm UTC](https://forumautomation.com/t/installation-and-maintenance-of-strainers/7229 "2019-10-03T15:43:50Z")
What is strainer? Strainers are mounted to avoid harm to pipeline machinery caused by foreign matter, dirt. Simply strainers are a kind of filter installed to avoid foreign matter from damaging machinery in the pipeline.… --- ## [Valve positioner and its working](https://forumautomation.com/t/valve-positioner-and-its-working/115)
**Author:** [@instrumen](https://forumautomation.com/u/instrumen)\ **Replies:** 0\ **Last updated:** [October 3, 2014, 1:50pm UTC](https://forumautomation.com/t/valve-positioner-and-its-working/115 "2014-10-03T13:50:57Z")
Valve Positioner is a unit used on a control valve to keep the valve in position. It works as a booster relay with a valve stroke feed back. A controller output is fed to the valve positioner and the valve position provi… --- ## [Possible reasons if a control valve fails to open/close](https://forumautomation.com/t/possible-reasons-if-a-control-valve-fails-to-open-close/117)
**Author:** [@instrumen](https://forumautomation.com/u/instrumen)\ **Replies:** 0\ **Last updated:** [October 3, 2014, 1:53pm UTC](https://forumautomation.com/t/possible-reasons-if-a-control-valve-fails-to-open-close/117 "2014-10-03T13:53:00Z")
Gland packing is too tight Actuator bench set is not proper or suitable Process load change is too high Trim is an unbalanced type Actuator spring is broken Air supply to the valve positioner / actuator is close or high … --- ## [What are the different valve characteristic?](https://forumautomation.com/t/what-are-the-different-valve-characteristic/11168)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\ **Replies:** 0\ **Last updated:** [May 18, 2023, 4:50am UTC](https://forumautomation.com/t/what-are-the-different-valve-characteristic/11168 "2023-05-18T04:50:48Z")
Control valves are essential components used in various industries to regulate fluid flow rates. The flow characteristic of a control valve refers to the relationship between the valve opening or position and the resulti… --- ## [How to download articles,Quick start guide,ebooks and white papers about Fisher valves and regulators from emerson process management website?](https://forumautomation.com/t/how-to-download-articles-quick-start-guide-ebooks-and-white-papers-about-fisher-valves-and-regulators-from-emerson-process-management-website/1284)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\ **Replies:** 0\ **Last updated:** [August 28, 2016, 12:38am UTC](https://forumautomation.com/t/how-to-download-articles-quick-start-guide-ebooks-and-white-papers-about-fisher-valves-and-regulators-from-emerson-process-management-website/1284 "2016-08-28T00:38:23Z")
Following documents about Fisher valve and regulators are available for free public download from the emerson website. Articles,white papers,Handbook about control valves,ebook,Brochures,Instruction manuals,Quick start … [Previous page](https://forumautomation.com/c/field-instrumentation/valves/42.md?page=1&per_page=50) [Next page](https://forumautomation.com/c/field-instrumentation/valves/42.md?page=3&per_page=50)