Yes, ball valves or quarter turn valves tend to be more reliable than globe valves. Globe valves require a washer and a tight friction fit between the seat and washer, and if either of these wear out (which they do over time), leaks start. Ball valves are much simpler in construction.
If you want to learn more, please visit our website.
A downside to ball valves is that they are more difficult to get variable flow out of and are best when you need either on or off states, but nothing in between.
While there are more considerations for industry-specific applications, around the house, ball valves would be my choice for any shutoff valve.
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS
FIRST NAME
*
LAST NAME
*
*
MESSAGE
*
ADDITIONAL DETAILS
Thanks. We have received your request and will respond promptly.
Log In
Are you an
Engineering professional?
Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.
Promoting, selling, recruiting, coursework and thesis posting is forbidden.
Eng-Tips Posting Policies
Convert maunal ball valve to Automatic Shutdown Valve
thread408-21179 Forum Search FAQs Links MVPsForum
Search
FAQs
Links
MVPs
If you are looking for more details, kindly visit BSTV.
(Chemical)
(OP)
13 Apr 02 04:37Can I convert the manual ball valve to SDV by simply fit the actuator & all acessories? The valve body and the actuator has to same manufacturer or can be different ones?
(Mechanical)
13 Apr 02 10:55There are a lot of ways to accomplish this. Many actuator manufacturers have adapters that permit them to mount on a whole range of valves. However, these are not universal, so I'd do some checking before actually buying a component. I believe that there are companies specializing in retro-fit actuators.
(Mechanical)
14 Apr 02 00:33I haven't seen ball valves used as shutoff valves w/actuators attached, but after thinking about it, yes, you can. As long as the actuator is set to stroke the ball 90°, I think your plan would be entirely possible. If you have success, please repost...
(Mechanical)
15 Apr 02 10:44All the Ball valve manufacturer does not manufactre actuater themselves.Actuator is mostly bought out for valve manufacture.Valve manufacture provide the bracket as per standard practice for fixing the actuator and manual override.
(Mechanical)
15 Apr 02 13:34We commonly buy ball valves with double-actuating air actuators and solenoids. These are susally for valve in the plant that are not accessible and we locate a hand-operated station close to grade or a platform.
We usually order them together, and the valve supplier ships thenm to an instrument supplier to install the actuators prior to coming to us.
(Aerospace)
16 Aug 02 08:31This is not a problem.
You will need to collate the following information:
1. The Valve Opening Torque, Closing Torque and Running Torque between Open and Close.
2. Maximum Stem Shear Torque - so that the Actuator won't over stress the Stem!
3. Torque Safety Factor - applied to the Valve torque. This ensures the actuator will be capable of operating the valve in long stand still torque conditions. If you don't have a safety factor figure in mind the actuator manufacturer will add 25 to 30% to the valve torques.
4. Operating mode - Hydraulic, Pneumatic or Electric and then Spring return (fail close or Open when power is lost) or Double Acting.
5. Contact the original valve manufacturer and ask them for a "topworks" drawing of the valve stem and mounting flange. The actuator manufacturer will need this to supply a mounting bracket.
This should be enough info to obtain a quotation for an actuator.
(Mechanical)
17 Aug 02 00:04Perhaps I do not understand the meaning of automatic shutdown valve...
But if you are expecting this valve to automatically shut down on an emergency situation, e.g. a plant trip that requires a fast isolation of the system you have to make sure that the supplied actuator is springloaded to the closed position when the actuator is de-energized (no power, pressure, any energy applied).
This also opens another can of worms... can your system withstand a sudden valve shut-off? i.e. what about transients, pressure surges, water-hammer effect etc...
If emergency shutdown is not an issue... then the actuator can be slow opening and closing...but I would spec it out with limit switches to detect open closed positions as well as torque limit, but seems like this has been thoroughly covered before.
HTH
Saludos.
a.
(Mechanical)
19 Aug 02 08:29If you know the valve pipe size and the valve manufacturer you can probably get a retrofit actuator/linkage assembly, it depends on the valve construction.Try either Delta Control Products in Phoenix www.deltacp.com , or Belimo at www.belimo.com Just let them know whether or not you need spring return (fail safe) and the control voltage/signal you need for your application.Warning, retrofits are risky and troublesome and if the bracketry is wrong you won't be able to return it. I would recommend replacing the valve entirely. It will probably save you money/headaches in the long run.
(Mechanical)
24 Aug 02 01:09Hoang!It is possible by all means.Regards,
(Petroleum)
26 Aug 02 02:22Simple Answer : YESThere is an ISO standard for topwork mounting (5502 I think)- that most reputable manufacturers adhere to for the mounting of gearboxes and actuators.Any reputable actuator manufacturer will be able to assist.Try this site : www.rotork.co.uk Use of Ball valves as SDV's are common. Just be sure that the valve is of a robust design for the appplication intended.Hope this helps
Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.
Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.
Click Here to join Eng-Tips and talk with other members! Already a Member? Login
If you want to learn more, please visit our website ball valve supplier.