what is the meaning of reverse action and forward action of
control valve...

Answer Posted / www.islamqa.com

For linear motion valves

Direct acting valve:
====================
valve opens when stem is drawn out of the body

Reverse acting valve:
=====================
valve closes when stem in pushed into the body

reference:
Lessons in industrial instrumentation - version 4 - page:713


Regards,

Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
CELL.: 00 2 0121367310

Is This Answer Correct ?    6 Yes 9 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

what is metal of piston ring

1479


Using your own examples solve a problem involving normal table. (experimental method and analysis)

659


How to Calibrate Ultrasonic flow Transmitter in Field

773


we have level transmitter for h2s04 storage tank capacity 10k ,always there are failure of transmitter due to failure of magnetic floats ,please come up with solutions at the earliest.

1570


what is the PC interface and software for connection to ABB logic module “ LM011-CE18RAC “ ( for Programming ) ??

3401






What are different types of orifice plates?

612


what are the values of fuel flow rate in various places in boiler.

1214


what is different between 2,3&4 wire rtd and how much maximum distance using plc to field.

2249


Identification of ss fittings, pilot valves, relief valve.

1368


Explain why use mmwc unit?

613


in differential pressure transmitter,min&max pressure range for hp&lp

1510


what is the difference between Cv and air consumption? why the customer needs Air consumption details?

1502


why direct mounted pressure transmitters is always installed with DBB ( double bleed block) valve in process line or top of the tanks ?

1565


Hello to all....I am an Instrumentation Graduate and i am passed out in this year only.. I am unable to find the job in my core instrumentation.. so any boby tell me how to and where to search the job....please...and also tell me i there are any courses offered in the instrumentation stream so i can do it... you can send your suggestions to my mail-id i.e Ganesh20084u@gmail.com ... please..

1474


how many maximum enter 2mm Dia solid cylindrical pipe into 8mm Dia hollow cylindrical pipe. give answer with calculation.

1553