# Valves
**URL:** https://forumautomation.com/c/field-instrumentation/valves/42.md?page=3
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**Page:** 4
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## [Control valve definition and types](https://forumautomation.com/t/control-valve-definition-and-types/107)
**Author:** [@instrumen](https://forumautomation.com/u/instrumen)\
**Replies:** 0\
**Last updated:** [October 3, 2014, 12:57pm UTC](https://forumautomation.com/t/control-valve-definition-and-types/107 "2014-10-03T12:57:24Z")
A control valve is a final control element (end element) used in a process line to control the process. Commonly used control valve types are: Globe valve Butterfly valve Ball vale
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## [Lantern ring location on a control valve](https://forumautomation.com/t/lantern-ring-location-on-a-control-valve/119)
**Author:** [@instrumen](https://forumautomation.com/u/instrumen)\
**Replies:** 0\
**Last updated:** [October 3, 2014, 1:55pm UTC](https://forumautomation.com/t/lantern-ring-location-on-a-control-valve/119 "2014-10-03T13:55:48Z")
A greasing ring placed in the valve bonnet across the gland packing. The unit provides lubrication to the valve stem when lit travels up and down.
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## [Which valves are used to control gas flow system?](https://forumautomation.com/t/which-valves-are-used-to-control-gas-flow-system/10942)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 0\
**Last updated:** [March 7, 2023, 4:34am UTC](https://forumautomation.com/t/which-valves-are-used-to-control-gas-flow-system/10942 "2023-03-07T04:34:25Z")
Maintaining the flow of oil and gas through pipelines is a difficult undertaking that requires for a variety of dependable equipment. One of these essential components is a gas valve. The oil and gas sector could not …
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## [What are the 3 most common control valve flow characteristics?](https://forumautomation.com/t/what-are-the-3-most-common-control-valve-flow-characteristics/12918)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 1\
**Last updated:** [January 8, 2025, 3:50am UTC](https://forumautomation.com/t/what-are-the-3-most-common-control-valve-flow-characteristics/12918 "2025-01-08T03:50:59Z")
What are the 3 most common control valve flow characteristics?
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## [Control valve parts](https://forumautomation.com/t/control-valve-parts/111)
**Author:** [@instrumen](https://forumautomation.com/u/instrumen)\
**Replies:** 0\
**Last updated:** [October 3, 2014, 1:47pm UTC](https://forumautomation.com/t/control-valve-parts/111 "2014-10-03T13:47:18Z")
a) Trim b) CV c) Actuator d) Stem travel e) Valve body f) Yoke g) Gland packing Trim : Trim is a matched pair of ‘plug’ and ‘seat’ CV : The amount of water flow in gallons through the control valve when the valve port …
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## [How to troubleshoot a pH measurement problem?](https://forumautomation.com/t/how-to-troubleshoot-a-ph-measurement-problem/1287)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\
**Replies:** 0\
**Last updated:** [August 28, 2016, 3:52am UTC](https://forumautomation.com/t/how-to-troubleshoot-a-ph-measurement-problem/1287 "2016-08-28T03:52:35Z")
Troubleshooting techniques for pH measurement. 1.Measuring electrode can be bad. Glass electrodes age with time,causing a slowed reaction to pH change. Glass electrode can be broken or have small holes in them,usually…
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## [How can control valve noise be predicted and mitigated in industrial settings?](https://forumautomation.com/t/how-can-control-valve-noise-be-predicted-and-mitigated-in-industrial-settings/11847)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 1\
**Last updated:** [March 7, 2024, 7:33am UTC](https://forumautomation.com/t/how-can-control-valve-noise-be-predicted-and-mitigated-in-industrial-settings/11847 "2024-03-07T07:33:10Z")
How can control valve noise be predicted and mitigated in industrial settings?
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## [Differential pressure ratio for selection control valve type](https://forumautomation.com/t/differential-pressure-ratio-for-selection-control-valve-type/1236)
**Author:** [@automate](https://forumautomation.com/u/automate)\
**Replies:** 0\
**Last updated:** [August 7, 2016, 11:46pm UTC](https://forumautomation.com/t/differential-pressure-ratio-for-selection-control-valve-type/1236 "2016-08-07T23:46:34Z")
What is limitation on differential pressure ratio for selection control valve type i.e Ball type,Butterfly Type? What is international standard for this point?
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## [What are the functions of a process valve?](https://forumautomation.com/t/what-are-the-functions-of-a-process-valve/881)
**Author:** [@denizen](https://forumautomation.com/u/denizen)\
**Replies:** 0\
**Last updated:** [March 20, 2016, 4:50pm UTC](https://forumautomation.com/t/what-are-the-functions-of-a-process-valve/881 "2016-03-20T16:50:18Z")
Functions of process valves are 1.Block or Isolate -On/Off 2.Control,Modulate or Throttle. 3.Divert or Mix fluid 4.Back Flow Prevention 5.Pressure Relief Device.
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## [Poppet valve and its working](https://forumautomation.com/t/poppet-valve-and-its-working/10892)
**Author:** [@Sudha\_m](https://forumautomation.com/u/Sudha_m)\
**Replies:** 0\
**Last updated:** [February 20, 2023, 10:18am UTC](https://forumautomation.com/t/poppet-valve-and-its-working/10892 "2023-02-20T10:18:57Z")
Poppet Valve A poppet valve is a type of valve that controls the flow of liquids or gases in numerous different mechanical systems. This type valve consists of housing bore which poppet is held by a small spring for…
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## [Over sized control valve](https://forumautomation.com/t/over-sized-control-valve/112)
**Author:** [@instrumen](https://forumautomation.com/u/instrumen)\
**Replies:** 0\
**Last updated:** [October 3, 2014, 1:48pm UTC](https://forumautomation.com/t/over-sized-control-valve/112 "2014-10-03T13:48:25Z")
A control valve is said to be oversized when a minimum signal to the valve (minimum opening of the valve) brings process to the set point rapidly. This situation leads to an imbalance and high gain in the control loop. T…
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## [What are the common maintenance practices for ensuring the longevity of directional control valves?](https://forumautomation.com/t/what-are-the-common-maintenance-practices-for-ensuring-the-longevity-of-directional-control-valves/12269)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 1\
**Last updated:** [July 21, 2024, 7:28am UTC](https://forumautomation.com/t/what-are-the-common-maintenance-practices-for-ensuring-the-longevity-of-directional-control-valves/12269 "2024-07-21T07:28:54Z")
What are the common maintenance practices for ensuring the longevity of directional control valves?
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## [What is a pinch valve, how it works, what applications it has, and its advantages and disadvantages](https://forumautomation.com/t/what-is-a-pinch-valve-how-it-works-what-applications-it-has-and-its-advantages-and-disadvantages/10973)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 0\
**Last updated:** [March 15, 2023, 1:53am UTC](https://forumautomation.com/t/what-is-a-pinch-valve-how-it-works-what-applications-it-has-and-its-advantages-and-disadvantages/10973 "2023-03-15T01:53:57Z")
What is Pinch valve? The flow of corrosive, abrasive, or granular media can be stopped or controlled with the help of a pinch valve, a two-way valve. To open or close the valve, compressed air is used. The valve has …
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## [What is equal percentage?, what is linearity in PICV? What is valve stem? What is stroke time? What is hold off pressure, close off pressure?](https://forumautomation.com/t/what-is-equal-percentage-what-is-linearity-in-picv-what-is-valve-stem-what-is-stroke-time-what-is-hold-off-pressure-close-off-pressure/11741)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 0\
**Last updated:** [January 26, 2024, 4:12pm UTC](https://forumautomation.com/t/what-is-equal-percentage-what-is-linearity-in-picv-what-is-valve-stem-what-is-stroke-time-what-is-hold-off-pressure-close-off-pressure/11741 "2024-01-26T16:12:04Z")
What is equal percentage, what is linearity in PICV? What is valve stem? What is stroke time? What is hold off pressure, close off pressure? Equal Percentage: Control valves and pressure-independent control valves (P…
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## [What is the use of bellow seal type bonnet in control valve?](https://forumautomation.com/t/what-is-the-use-of-bellow-seal-type-bonnet-in-control-valve/11873)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 0\
**Last updated:** [March 15, 2024, 1:10pm UTC](https://forumautomation.com/t/what-is-the-use-of-bellow-seal-type-bonnet-in-control-valve/11873 "2024-03-15T13:10:47Z")
What is the use of bellow seal type bonnet in control valve? The bellows seal type bonnet in a control valve serves several important purposes: Leakage Prevention: Bellows seal bonnets provide a secondary seal to pr…
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## [What is a valve trim?](https://forumautomation.com/t/what-is-a-valve-trim/11011)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 0\
**Last updated:** [March 28, 2023, 6:32am UTC](https://forumautomation.com/t/what-is-a-valve-trim/11011 "2023-03-28T06:32:39Z")
Valve trim refers to the internal parts of a valve that are in contact with the fluid or gas flowing through the valve. The valve trim plays a crucial role in determining the flow characteristics and performance of th…
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## [Flow control Hydraulic proportional solenoid valve](https://forumautomation.com/t/flow-control-hydraulic-proportional-solenoid-valve/10142)
**Author:** [@Maj](https://forumautomation.com/u/Maj)\
**Replies:** 0\
**Last updated:** [January 21, 2022, 11:17am UTC](https://forumautomation.com/t/flow-control-hydraulic-proportional-solenoid-valve/10142 "2022-01-21T11:17:41Z")
Hello, I am trying to control hydraulic flow in pipeline, please find the attached sketch. I need your advice please if this will be the best solution or if you can recommend me the best option that will be great. from …
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## [What is the equal percentage trim on a valve?](https://forumautomation.com/t/what-is-the-equal-percentage-trim-on-a-valve/13099)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 1\
**Last updated:** [March 20, 2025, 8:06am UTC](https://forumautomation.com/t/what-is-the-equal-percentage-trim-on-a-valve/13099 "2025-03-20T08:06:52Z")
What is the equal percentage trim on a valve?
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## [When should I use a linear or equal percentage valve?](https://forumautomation.com/t/when-should-i-use-a-linear-or-equal-percentage-valve/13100)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 1\
**Last updated:** [March 28, 2025, 5:20pm UTC](https://forumautomation.com/t/when-should-i-use-a-linear-or-equal-percentage-valve/13100 "2025-03-28T17:20:05Z")
When should I use a linear or equal percentage valve?
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## [Why do we need to use emergency shut down valve](https://forumautomation.com/t/why-do-we-need-to-use-emergency-shut-down-valve/9363)
**Author:** [@instrumentationtechi](https://forumautomation.com/u/instrumentationtechi)\
**Replies:** 1\
**Last updated:** [April 30, 2021, 8:13am UTC](https://forumautomation.com/t/why-do-we-need-to-use-emergency-shut-down-valve/9363 "2021-04-30T08:13:19Z")
What is ESDV and its uses and purposes, in which place do we use this
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## [How to select control valve for various process industries?](https://forumautomation.com/t/how-to-select-control-valve-for-various-process-industries/10954)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 0\
**Last updated:** [March 11, 2023, 4:29am UTC](https://forumautomation.com/t/how-to-select-control-valve-for-various-process-industries/10954 "2023-03-11T04:29:34Z")
Factors to Considering While Choosing a Control Valve for Your Process This section’s goal is to give you information that will make choosing a control valve for your next project easier. Transferable liquid: Which …
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## [What are the functions of nozzle, diffuser, and throttle valve in turbines and compressors?](https://forumautomation.com/t/what-are-the-functions-of-nozzle-diffuser-and-throttle-valve-in-turbines-and-compressors/12752)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 1\
**Last updated:** [October 29, 2024, 11:35am UTC](https://forumautomation.com/t/what-are-the-functions-of-nozzle-diffuser-and-throttle-valve-in-turbines-and-compressors/12752 "2024-10-29T11:35:31Z")
What are the functions of nozzle, diffuser, and throttle valve in turbines and compressors?
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## [Test equipment required to calibrate a pressure transmitter in the field](https://forumautomation.com/t/test-equipment-required-to-calibrate-a-pressure-transmitter-in-the-field/56)
**Author:** [@instrumen](https://forumautomation.com/u/instrumen)\
**Replies:** 0\
**Last updated:** [October 2, 2014, 5:38pm UTC](https://forumautomation.com/t/test-equipment-required-to-calibrate-a-pressure-transmitter-in-the-field/56 "2014-10-02T17:38:31Z")
If it is a low range transmitter, then precision pneumatic test equipment like “Wallace and tiernier” and pneumatic pump (or air supply) may be used. If it is a high range transmitter, then a hydraulic pump and a test ga…
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## [Compare Direct Acting Solenoid valve, DC Solenoid valve and AC Solenoid valve?](https://forumautomation.com/t/compare-direct-acting-solenoid-valve-dc-solenoid-valve-and-ac-solenoid-valve/11205)
**Author:** [@Sudha\_m](https://forumautomation.com/u/Sudha_m)\
**Replies:** 0\
**Last updated:** [June 1, 2023, 10:04am UTC](https://forumautomation.com/t/compare-direct-acting-solenoid-valve-dc-solenoid-valve-and-ac-solenoid-valve/11205 "2023-06-01T10:04:51Z")
Direct acting Solenoid valve Operating Principle: Direct-acting solenoid valves work by directly opening or closing the valve using the magnetic force produced by an energized coil. The plunger or diaphragm of the val…
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## [Instrumentation Forms](https://forumautomation.com/t/instrumentation-forms/5061)
**Author:** [@Ziggy](https://forumautomation.com/u/Ziggy)\
**Replies:** 0\
**Last updated:** [October 30, 2018, 3:09pm UTC](https://forumautomation.com/t/instrumentation-forms/5061 "2018-10-30T15:09:08Z")
Does anyone have a complete forms index I could have? i.e. PT, PS, TT, automated valve, loop, commissioning…
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## [Control valve about help](https://forumautomation.com/t/control-valve-about-help/10528)
**Author:** [@Arda95](https://forumautomation.com/u/Arda95)\
**Replies:** 0\
**Last updated:** [July 13, 2022, 4:17am UTC](https://forumautomation.com/t/control-valve-about-help/10528 "2022-07-13T04:17:48Z")
Hello my dear automation friends, I work as an instrument maintenance in the factory. Additional scope has been made, there are 15 valves, 5 of these valves are fail open, and these 5 of them want 20-4 ma instead of 4-20…
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## [Can you provide information on how to select a pneumatic control valve?](https://forumautomation.com/t/can-you-provide-information-on-how-to-select-a-pneumatic-control-valve/12564)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 1\
**Last updated:** [September 16, 2024, 10:57am UTC](https://forumautomation.com/t/can-you-provide-information-on-how-to-select-a-pneumatic-control-valve/12564 "2024-09-16T10:57:22Z")
Can you provide information on how to select a pneumatic control valve?
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## [How Do Diaphragm Valves Work? It's application](https://forumautomation.com/t/how-do-diaphragm-valves-work-its-application/10642)
**Author:** [@diaphragmdirect](https://forumautomation.com/u/diaphragmdirect)\
**Replies:** 0\
**Last updated:** [September 7, 2022, 10:10am UTC](https://forumautomation.com/t/how-do-diaphragm-valves-work-its-application/10642 "2022-09-07T10:10:03Z")
How Do Diaphragm Valves Work? A diaphragm valve is used in dust collection to control airflow through filters to maximize cleaning. Diaphragm valves produce an air pulse that knocks loose any debris on a filter’s exteri…
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## [Which types of valves used in water treatment plant?](https://forumautomation.com/t/which-types-of-valves-used-in-water-treatment-plant/10903)
**Author:** [@Sudha\_m](https://forumautomation.com/u/Sudha_m)\
**Replies:** 0\
**Last updated:** [February 23, 2023, 8:36am UTC](https://forumautomation.com/t/which-types-of-valves-used-in-water-treatment-plant/10903 "2023-02-23T08:36:34Z")
Water treatment facilities must use the correct valves in their systems. As we need for maintenance because the reliability, efficiency, and safety of piping systems are ensured. This is true for all kinds of water purif…
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## [What are some common industrial applications of linear actuators?](https://forumautomation.com/t/what-are-some-common-industrial-applications-of-linear-actuators/12352)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 1\
**Last updated:** [August 9, 2024, 2:35am UTC](https://forumautomation.com/t/what-are-some-common-industrial-applications-of-linear-actuators/12352 "2024-08-09T02:35:30Z")
What are some common industrial applications of linear actuators?
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## [Would it be possible to use a control valve without a positioner?](https://forumautomation.com/t/would-it-be-possible-to-use-a-control-valve-without-a-positioner/12093)
**Author:** [@Sundar\_Iyalunaidu](https://forumautomation.com/u/Sundar_Iyalunaidu)\
**Replies:** 1\
**Last updated:** [May 29, 2024, 9:42am UTC](https://forumautomation.com/t/would-it-be-possible-to-use-a-control-valve-without-a-positioner/12093 "2024-05-29T09:42:22Z")
Would it be possible to use a control valve without a positioner ?
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## [How do i Manage the Increased Pressure While using a Flow Control Valve?](https://forumautomation.com/t/how-do-i-manage-the-increased-pressure-while-using-a-flow-control-valve/11721)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 0\
**Last updated:** [January 19, 2024, 8:38am UTC](https://forumautomation.com/t/how-do-i-manage-the-increased-pressure-while-using-a-flow-control-valve/11721 "2024-01-19T08:38:16Z")
How do i Manage the Increased Pressure While using a Flow Control Valve? Managing Increased Pressure with Flow Control Valves Controlling the flow of fluids and keeping the system stable are two major jobs of flow contro…
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## [What is the use of hydraulic needle valve?](https://forumautomation.com/t/what-is-the-use-of-hydraulic-needle-valve/12844)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 1\
**Last updated:** [January 8, 2025, 5:41am UTC](https://forumautomation.com/t/what-is-the-use-of-hydraulic-needle-valve/12844 "2025-01-08T05:41:14Z")
What is the use of hydraulic needle valve?
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## [How are electric actuators typically controlled, and what are some of the advantages and disadvantages of different control methods?](https://forumautomation.com/t/how-are-electric-actuators-typically-controlled-and-what-are-some-of-the-advantages-and-disadvantages-of-different-control-methods/12522)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 1\
**Last updated:** [October 1, 2024, 5:18am UTC](https://forumautomation.com/t/how-are-electric-actuators-typically-controlled-and-what-are-some-of-the-advantages-and-disadvantages-of-different-control-methods/12522 "2024-10-01T05:18:04Z")
How are electric actuators typically controlled, and what are some of the advantages and disadvantages of different control methods?
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## [If valve positioner preferred even on a control valve having a bench valve having a bench set 20-100 kPa](https://forumautomation.com/t/if-valve-positioner-preferred-even-on-a-control-valve-having-a-bench-valve-having-a-bench-set-20-100-kpa/116)
**Author:** [@instrumen](https://forumautomation.com/u/instrumen)\
**Replies:** 0\
**Last updated:** [October 3, 2014, 1:52pm UTC](https://forumautomation.com/t/if-valve-positioner-preferred-even-on-a-control-valve-having-a-bench-valve-having-a-bench-set-20-100-kpa/116 "2014-10-03T13:52:05Z")
It makes the valve response (movement) quicker. When there is a load change in the process, the positioner assists the valve to achieve the stroke length per the controller’s instruction.
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## [What factors should one consider when selecting a cryogenic shut off valve for specific applications?](https://forumautomation.com/t/what-factors-should-one-consider-when-selecting-a-cryogenic-shut-off-valve-for-specific-applications/12011)
**Author:** [@Sundar\_Iyalunaidu](https://forumautomation.com/u/Sundar_Iyalunaidu)\
**Replies:** 1\
**Last updated:** [April 29, 2024, 4:15pm UTC](https://forumautomation.com/t/what-factors-should-one-consider-when-selecting-a-cryogenic-shut-off-valve-for-specific-applications/12011 "2024-04-29T16:15:54Z")
What factors should one consider when selecting a cryogenic shut off valve for specific applications?
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## [What is the difference between two way and three way control valve](https://forumautomation.com/t/what-is-the-difference-between-two-way-and-three-way-control-valve/9542)
**Author:** [@instrumentationtechi](https://forumautomation.com/u/instrumentationtechi)\
**Replies:** 1\
**Last updated:** [June 26, 2021, 10:09am UTC](https://forumautomation.com/t/what-is-the-difference-between-two-way-and-three-way-control-valve/9542 "2021-06-26T10:09:14Z")
Explain the difference between two way and three way control valve
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## [What is the difference between pressure reducing valves and pressure regulators](https://forumautomation.com/t/what-is-the-difference-between-pressure-reducing-valves-and-pressure-regulators/9649)
**Author:** [@instrumentationtechi](https://forumautomation.com/u/instrumentationtechi)\
**Replies:** 1\
**Last updated:** [July 26, 2021, 4:55am UTC](https://forumautomation.com/t/what-is-the-difference-between-pressure-reducing-valves-and-pressure-regulators/9649 "2021-07-26T04:55:44Z")
Is the pressure regulator same as the pressure reducing valve
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## [Definition of "Pressure Sample Type Internal, back pressure"](https://forumautomation.com/t/definition-of-pressure-sample-type-internal-back-pressure/2732)
**Author:** [@Qulu\_Quliyev](https://forumautomation.com/u/Qulu_Quliyev)\
**Replies:** 0\
**Last updated:** [November 28, 2017, 6:35am UTC](https://forumautomation.com/t/definition-of-pressure-sample-type-internal-back-pressure/2732 "2017-11-28T06:35:49Z")
Dear All, I found the following definition in the valve datasheet “Pressure Sample Type Internal, back pressure”, but I don’t have clear idea what does it mean. Is there anyone who has clear explanation about it? Best Re…
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## [What does an electronic valve controller do?](https://forumautomation.com/t/what-does-an-electronic-valve-controller-do/12813)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 1\
**Last updated:** [November 13, 2024, 5:13pm UTC](https://forumautomation.com/t/what-does-an-electronic-valve-controller-do/12813 "2024-11-13T17:13:33Z")
What does an electronic valve controller do?
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## [Anti-surge valve](https://forumautomation.com/t/anti-surge-valve/4389)
**Author:** [@Engineer](https://forumautomation.com/u/Engineer)\
**Replies:** 0\
**Last updated:** [August 15, 2018, 12:59pm UTC](https://forumautomation.com/t/anti-surge-valve/4389 "2018-08-15T12:59:09Z")
Who has an idea about such designed valve?
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## [What is a V ball valve?](https://forumautomation.com/t/what-is-a-v-ball-valve/10896)
**Author:** [@Sudha\_m](https://forumautomation.com/u/Sudha_m)\
**Replies:** 0\
**Last updated:** [February 22, 2023, 4:44am UTC](https://forumautomation.com/t/what-is-a-v-ball-valve/10896 "2023-02-22T04:44:08Z")
What is a V ball valve? A control valve with a v-shaped ball or seal is known as a v-port ball valve. Better fluid management is made possible by the “v” form. The moulded v-bore sets the v-port ball valves apart from o…
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## [A pressure-relief valve has a pressure setting of 140 bar. Compute the kW loss across this valve if it returns all the flow back to the tank from a 0.0016 3 m / s pump](https://forumautomation.com/t/a-pressure-relief-valve-has-a-pressure-setting-of-140-bar-compute-the-kw-loss-across-this-valve-if-it-returns-all-the-flow-back-to-the-tank-from-a-0-0016-3-m-s-pump/12146)
**Author:** [@Sundar\_Iyalunaidu](https://forumautomation.com/u/Sundar_Iyalunaidu)\
**Replies:** 1\
**Last updated:** [June 14, 2024, 4:35pm UTC](https://forumautomation.com/t/a-pressure-relief-valve-has-a-pressure-setting-of-140-bar-compute-the-kw-loss-across-this-valve-if-it-returns-all-the-flow-back-to-the-tank-from-a-0-0016-3-m-s-pump/12146 "2024-06-14T16:35:26Z")
A pressure-relief valve has a pressure setting of 140 bar. Compute the kW loss across this valve if it returns all the flow back to the tank from a 0.0016 3 m / s pump.
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## [Can you put a DVC6200 on a Fisher D4 control valve?](https://forumautomation.com/t/can-you-put-a-dvc6200-on-a-fisher-d4-control-valve/12233)
**Author:** [@automation\_engineer6](https://forumautomation.com/u/automation_engineer6)\
**Replies:** 1\
**Last updated:** [July 5, 2024, 1:55pm UTC](https://forumautomation.com/t/can-you-put-a-dvc6200-on-a-fisher-d4-control-valve/12233 "2024-07-05T13:55:28Z")
Can you put a DVC6200 on a Fisher D4 control valve?
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## [How to do maintenance on struck control valve?](https://forumautomation.com/t/how-to-do-maintenance-on-struck-control-valve/11808)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 1\
**Last updated:** [February 21, 2024, 5:29pm UTC](https://forumautomation.com/t/how-to-do-maintenance-on-struck-control-valve/11808 "2024-02-21T17:29:41Z")
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## [What’s the difference between a control valve actuator and a positioner, and why does it matter?](https://forumautomation.com/t/what-s-the-difference-between-a-control-valve-actuator-and-a-positioner-and-why-does-it-matter/13271)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 1\
**Last updated:** [May 23, 2025, 7:06am UTC](https://forumautomation.com/t/what-s-the-difference-between-a-control-valve-actuator-and-a-positioner-and-why-does-it-matter/13271 "2025-05-23T07:06:52Z")
What’s the difference between a control valve actuator and a positioner, and why does it matter?
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## [Hydraulic Accumulator - Temperature Effect on Nitrogen Pre-Charge](https://forumautomation.com/t/hydraulic-accumulator-temperature-effect-on-nitrogen-pre-charge/11431)
**Author:** [@dstuart82](https://forumautomation.com/u/dstuart82)\
**Replies:** 0\
**Last updated:** [August 24, 2023, 2:43pm UTC](https://forumautomation.com/t/hydraulic-accumulator-temperature-effect-on-nitrogen-pre-charge/11431 "2023-08-24T14:43:24Z")
Good Afternoon, I am currently studying for a degree in Instrumentation, Measurement & Control. As part of my learning, I have been askedto write a paper which discusses the effect (if any) that outside temperature has o…
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## [Explain the need for bypass valve in a process](https://forumautomation.com/t/explain-the-need-for-bypass-valve-in-a-process/9545)
**Author:** [@instrumentationtechi](https://forumautomation.com/u/instrumentationtechi)\
**Replies:** 1\
**Last updated:** [June 28, 2021, 7:34am UTC](https://forumautomation.com/t/explain-the-need-for-bypass-valve-in-a-process/9545 "2021-06-28T07:34:36Z")
What is the purpose of a bypass valve
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## [What are the advantages and disadvantages of diaphragm valves?](https://forumautomation.com/t/what-are-the-advantages-and-disadvantages-of-diaphragm-valves/12619)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 1\
**Last updated:** [October 1, 2024, 5:09am UTC](https://forumautomation.com/t/what-are-the-advantages-and-disadvantages-of-diaphragm-valves/12619 "2024-10-01T05:09:43Z")
What are the advantages and disadvantages of diaphragm valves?
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## [How can you ensure the proper maintenance of pressure safety valves?](https://forumautomation.com/t/how-can-you-ensure-the-proper-maintenance-of-pressure-safety-valves/12434)
**Author:** [@Instrument\_Engineer](https://forumautomation.com/u/Instrument_Engineer)\
**Replies:** 1\
**Last updated:** [August 19, 2024, 4:26pm UTC](https://forumautomation.com/t/how-can-you-ensure-the-proper-maintenance-of-pressure-safety-valves/12434 "2024-08-19T16:26:31Z")
How can you ensure the proper maintenance of pressure safety valves?
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