can we use a control valve without positioner
Answers were Sorted based on User's Feedback
Answer / ashish namdev
YES
1. put air pressure at a certain value (according max air requirement for actuator full action )
2. then connect limit switch at several position (0-100 scale)
3. then make a logic for open & close control action with use limit switch feedback.
4. connect air inlet with solenoid or pilot valve.
Ashish Namdev (Sr. Engg)
Jaypee Power Plant,
Bina (MP)
Is This Answer Correct ? | 0 Yes | 0 No |
Answer / kamesh.g
No we can not control the control valve without positioner
eccept on-off type control valves ,Positioner main purpose
is boostup the air signal from I/P and put the position as
per your requirement ( Command)positioner link rod will
give the feedback to control valve air command air supply
so it can adjust the valve in correct position.
Is This Answer Correct ? | 2 Yes | 5 No |
Answer / m.ra
Yes we can operate a control without a positioner in the
following condiotions.
1) Volume booster is not required.
2) Operation of control valve will be very sluggish.
3) Charecteristics of control valve cannot be changed.
4) If the valve is self regulation than also positioner is
not required.
Is This Answer Correct ? | 4 Yes | 8 No |
Answer / ajith294
here more answers reagrading positioner
maximum of the answers are 'YES' especially Answer number
10,
then i have a doubt that how control a valve at 50% open,
with out a positioner.
if there is not a positioner, how we can control the valve
( control the pnumatic pressure is applied the
actuator)?????
if a valve it using fully open of fully close condtion
throgh Solenoid Valve ( bypass the air to actuator) is on
off valve.
Without a positioner we cannot control the valve through a
controller.
thanks
Is This Answer Correct ? | 1 Yes | 6 No |
Answer / sandy
The name itself indicates the function of the positioner. A
control valve without positioner will act as a ON-OFF valve.
Is This Answer Correct ? | 13 Yes | 21 No |
Answer / yogesh
On-off control valve can use without positioner. but globe
control valve can not use without positioner.
Is This Answer Correct ? | 6 Yes | 24 No |
Which mechanical device is used in pressure gauges to reduce pulsating
I have seen the Temperature element (T/C & RTD) installed in process line on 45 degree position, Why? What it mean? How many types of tapping position for temperature elements?
what is installation and commissioning of (fat & sat) of power plant dcs ? this question keeps in desirable conditions of one company .
in differential pressure transmitter,min&max pressure range for hp&lp
Why is it necessary to use compensation leg to measure the liquid level in a closed or pressurized tank?
What is flow ,level, pressure transmitter ?and units?
How process line mpm calculation is done?
HOW DPT WORKS?
A pressure transmitter with a range of 0-100 bar.The accuracy of the instrument is 1% of upper range value? The pressure indicating transmitter is showing the system pressure is 50 bar. b. When you include the error, what is the minimum possible pressure in our fuel gas system? i. 49.5 bar ii. 49 bar iii. 1 bar iv. 0.5 bar We want to change the filter cartridge. We must depressure the fuel gas system. c. After we depressure the system in preparation for maintenance, the transmitter displays a pressure of +0.1 bar. At this time, what is the possible range of pressures in our fuel system? i. +0.099 to +0.101 bar ii. 0 to +0.2 bar iii. -0.1 to +0.3 bar iv. -0.9 to +1.1 bar
how to calibrate temprature switch and flow switch ?
TCD Principle
State 5 different method of level measurements.