1. on-off: 2-way/pressurize-exhaust: 2. pneumatic valve: sub-base mounting/hydraulic valve: 3. hand lever: manually operated/fluid pressure: 4. spool: hydraulic valve/poppet: 5. actuator free, flow to tank: open center/actuator held, flow to tank: 6. end of stroke: cushions/mid-stroke: 7. closed center: blocked center/float center: 8. spring offset: tank passage/spring returned: 9. actuator movement: extreme positions/system needs: 10. 3-position: spring centered/2-position: A. center position B. deceleration valve C. exhaust center D. exhaust passage E. pilot operated F. pneumatic valve G spring offset-returned H. subplate mounted I. tandem center J. 3-way

1. on-off: 2-way/pressurize-exhaust: 2. pneumatic valve: sub-base mounting/hydraulic valve: 3. hand lever: manually operated/fluid pressure: 4. spool: hydraulic valve/poppet: 5. actuator free, flow to tank: open center/actuator held, flow to tank: 6. end of stroke: cushions/mid-stroke: 7. closed center: blocked center/float center: 8. spring offset: tank passage/spring returned: 9. actuator movement: extreme positions/system needs: 10. 3-position: spring centered/2-position: A. center position B. deceleration valve C. exhaust center D. exhaust passage E. pilot operated F. pneumatic valve G spring offset-returned H. subplate mounted I. tandem center J. 3-way

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter50: Commercial, Packaged Rooftop, Variable Refrigerant Flow, And Variable Air Volume Systems

Section: Chapter Questions

Problem 15RQ: Explain why the outside air damper is typically never completely closed, even when the outside air...

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