Answer / kuber

The pressure will be proportional to the flow rate, as the
flow rate increases the pressure at inlet of the valve will
increase. then the valve starts to close relatively.

Answer / r.murugan

if pressure transmitter installed before pcv (example sp
10bar) suddenly pipe line flow increase pressure will
increase but as long as controller an auto controller will
give command to open the valve to maintain the setpoint pressure

if flow rate is less pressure is coming down less than
setpoint controller will give command to close the valve to
maintain the pressure (if pressure tapping before control
valve)

Answer / benny

reduce opening

Answer / triptisliet@gmail.com

according to bernauli's theorem total enerngy will remain
same so if velocity increases then pressure decreases.

Answer / tony lorenzo

If the controller is in Auto that time, and provided its been tuned, the pressure should remain as is. The PCV valve should open as expected, how much? we dont know.

the pump holds on run indication into the dcs and filed local control panel remote push button condition operaton wrong like when the push button pushing conditions the pump is off and the push button release condition the pump is on totally opposite condition . And control room inside give the stop command into dcs just 1secon relay engage and again normal condition. How can I slove

0 Answers  

How can we calibrate pressure and flow transmitter in the field(online)?

3 Answers   Aramco, Reddy Labs,

can i use capillary type dp transmitter converted to capillary type pressure transmitter. if i removed one side capillary tube its work correctly?

1 Answers  

how to calculate temp.prapotional to mv in thermocoulpe.

2 Answers   Electronics, KNPC,

what does a positioner in control valve ?

11 Answers  

What is cavitation. what is the effect of it on control valve and how is it prevented.

1 Answers   ADMA OPCO,

can we control operation of PLC from operator station?

3 Answers  

What is the difference between pneumatic and electro pnematic positioner?

3 Answers   TCS,

what do u mean by 2/3 soleniod valves?

8 Answers   Nile Sugar,

how u calibrate sox nox co2 co in cemps?what is opacity n HPm?tell the standard parameters of cems?

0 Answers  

Hello friends i need check lists of different instruments during the Erection and commissioning in thermal power plant.Please help me.My Mail id is naba02222@gmail.com/naba02222@rediffmail.com Thanks Nabakishore Biswal

1 Answers  

I have one DP transmitter of range 0-500mmWC i have to calculate its range in M3/hr for flow measurement so whats the formula.

4 Answers   ABB, TICB,