Another important aspect of actuator bench sets, is that for a "fail closed" valve assembly, the upper number of say a 6-30 Psi bench set must NOT be set less than the higher number, in this case 30 Psi, as the calculations associated with the actuator load & thereby valve seating load will be met, meaning that the valve will achieve it's seating criteria if set correctly. On the other hand, a "fail-open" valve assembly must have the upper bench set NOT exceed the upper number as the difference between the upper bench set and the regulator pressure setting determines the correct valve seat load.
1).What is the maximum pressure allowable for fisher 667/70 actuator diaphragm? 2). Is 2625 volume booster directly connect to supply air( 7 bar) or before AFR in same above actuator?
Thanks for the video,you are saying that benchset is to make sure the actuator compression,If the valve Is attached to the actuator, in order to close the valve to 100% is 11psi pressure is strong enough to close the valve?
Hello Mahdi, There are online and in classroom courses offered depending on the topic. Visit www.emerson.com/en-us/automation/services-consulting/educational-services to search for classes and their locations.
The term bench that originates from the practice of placing the actuator assembly on the bench to adjust the compression of the actuator spring actuator from the valve we make sure it's isolated from the valve stem forces I have Fisher 657 spring and diaphragm actuator and it's mounted to a Fisher Eazy-E valve body play it on the actuator I see that the bench set for this actuator is specified as 3 to 11 gobble is 3/4 of an inch borden because bench set is defined as the pressure range required to stroke the actuator to travel with no valve forces present you should see that the rate of travel of three quarters of an inch increase the input pressure from 3 to 11 direct-acting actuator the air connection is on the top of the diaphragm casing and I have the ability to change the pressure signal with this hand operated regulator notice that the traitor stem are not couple together pSI this spring is pushing the actuator to the upper travel stop this is important because bench set is always calibrated from the upper travel stop move is I increase the pressure from 0 to 3 PSI do to the initial compression of the spring at 3 PSI we see the first movement of the actuator this pressure where the initial movement of the actuator stem is detected is the lower bench set value to increase pressure in the actuator the stem continues to stroke down and as I approached 11 PSI I have reached the rated travel of the valve 3/4 of an inch actuator reaches the rated valve travel is the upper been set value I'm just verifying that the bench set on this actuator is calibrated correctly from 3 to 11 PSI is an important concept understand because it properly adjusting the bench that can result in the valve short stroking and not achieving rated capacity or inadequate seating Force to shut off the valve trouble by trying to make the actuator spring meet those same bench set numbers after it's connected to a valve don't fall into that trap easy way to verify that the correct spring is installed in the actuator and that it's in good operational condition see you in the classroom
Another important aspect of actuator bench sets, is that for a "fail closed" valve assembly, the upper number of say a 6-30 Psi bench set must NOT be set less than the higher number, in this case 30 Psi, as the calculations associated with the actuator load & thereby valve seating load will be met, meaning that the valve will achieve it's seating criteria if set correctly. On the other hand, a "fail-open" valve assembly must have the upper bench set NOT exceed the upper number as the difference between the upper bench set and the regulator pressure setting determines the correct valve seat load.
1).What is the maximum pressure allowable for fisher 667/70 actuator diaphragm?
2). Is 2625 volume booster directly connect to supply air( 7 bar) or before AFR in same above actuator?
Thanks for the video,you are saying that benchset is to make sure the actuator compression,If the valve Is attached to the actuator, in order to close the valve to 100% is 11psi pressure is strong enough to close the valve?
How we'll distinguished between bench set and operating rang ?????
How can be used tow solenoid to open and close the control valve
Thank you 😊 💓 ☺ 💗
hey. is there a webinar or downloadable video version of the classes he talks about or are they classroom based?
Hello Mahdi, There are online and in classroom courses offered depending on the topic. Visit www.emerson.com/en-us/automation/services-consulting/educational-services to search for classes and their locations.
The term bench that originates from the practice of placing the actuator assembly on the bench to adjust the compression of the actuator spring actuator from the valve we make sure it's isolated from the valve stem forces I have Fisher 657 spring and diaphragm actuator and it's mounted to a Fisher Eazy-E valve body play it on the actuator I see that the bench set for this actuator is specified as 3 to 11 gobble is 3/4 of an inch borden because bench set is defined as the pressure range required to stroke the actuator to travel with no valve forces present you should see that the rate of travel of three quarters of an inch increase the input pressure from 3 to 11 direct-acting actuator the air connection is on the top of the diaphragm casing and I have the ability to change the pressure signal with this hand operated regulator notice that the traitor stem are not couple together pSI this spring is pushing the actuator to the upper travel stop this is important because bench set is always calibrated from the upper travel stop move is I increase the pressure from 0 to 3 PSI do to the initial compression of the spring at 3 PSI we see the first movement of the actuator this pressure where the initial movement of the actuator stem is detected is the lower bench set value to increase pressure in the actuator the stem continues to stroke down and as I approached 11 PSI I have reached the rated travel of the valve 3/4 of an inch actuator reaches the rated valve travel is the upper been set value I'm just verifying that the bench set on this actuator is calibrated correctly from 3 to 11 PSI is an important concept understand because it properly adjusting the bench that can result in the valve short stroking and not achieving rated capacity or inadequate seating Force to shut off the valve trouble by trying to make the actuator spring meet those same bench set numbers after it's connected to a valve don't fall into that trap easy way to verify that the correct spring is installed in the actuator and that it's in good operational condition see you in the classroom
How to parches
pika pika