Full access allows:
- Solve all tests online without limits;
- Remove all advertisements on website;
- Adding questions to favorite list;
- Save learning progress;
- Save results of practice exams;
- Watching all wrong answered questions.
129. In the illustrated pneumatically operated, diaphragm actuated control valve, what statement is true concerning the opening and closing forces acting upon the control diaphragm
The spring force opens the valve, and pilot pressure applied to the top of the diaphragm closes it. This configuration, known as air-to-close, uses spring force to lift the stem and open the valve, while pilot air pressure pushes the stem down to close the valve.
Comments (0)
There are no comments at the moment. If you found an error or think question is incorrect, tell everyone about it
Only signed in users can write comments
Signin