Planning
Calculate the Approximate Clamping Time of a Fixture 1. Anticipated system operating pressure =__________________________________________________ (Bar) 2. For each non sequenced branch of a system: A. [Effective area per device __________ (cm 2 )] x [stroke used _________________ (cm)] =_ __________ (cm 3 ) B. Total number of devices = _______________________________________________________ C. Multiply line (2-A) x (2-B) = _____________________________________ ________________ (cm 3 ) D. Repeat steps (2-A) thru (2-C) for each different device and / or stroke length:____________________________ (cm 3 ) E. Total non-sequenced volume = lines (2-C) + (2-D) = _ _____________________________________ (cm 3 ) 3. First stage pump flow rate (faster - cm 3 /min, lower pressure) from the corresponding pump specifications page or Vektek catalog =_ _____________________________________________ (cm 3 /min) 4. Approximate time to achieve low pressure function = [line (2-E) ÷ line (3)] x (60) = _______________________ (seconds) 5. For each circuit branch with a sequence valve [if no sequence valves are used, skip to line (5-J) and enter -0-]: F. [Effective area per device__________ (cm 2 )] x [stroke used ________________ (cm)] = _ ___________ (cm 3 ) G. Total number of devices =_______________________________________________________ H. Multiply line (5-F) x (5-G) = _ ____________________________________________________ (cm 3 ) I. Repeat steps (5-F) thru (5-H) for each different device and / or stroke length: = _ ________________________ (cm 3 ) J. Total sequenced volume = line (5-H) + (5-I) =_ _________________________________________ (cm 3 ) 6. Estimate the approximate accumulator volume (if no accumulator is used, enter -0-): K. 49-0116-XX ≈ .155 x ____________ (system pres. - Bar) _ ________________________________ (cm 3 ) L. 49-0114-XX ≈ .045 x ____________ (system pres. - Bar) _ ________________________________ (cm 3 ) 7. Estimate the approximate flex hose expansion volume (*): M. Flex hose expansion volume (cm 3 / m) = _______________________________________________ (cm 3 / m) N. Total length of hose used (m) = ____________________________________________________ (m) O. Multiply line (7-M) x (7-N) =_ ____________________________________________________ (cm 3 ) P. Repeat steps (7-M) thru (7-N) for each different sized hose _ ____________________________________ (cm 3 ) Q. Total expansion volume for flex hoses = line (7-O) + (7-P) = __________________________________ (cm 3 ) 8. Low flow volume of devices in the system = line (5-J) + line (6K or 6L) + line (7-Q) = _____________________ (cm 3 ) 9. Estimate the anticipated volume of oil in the plumbing lines of the system: R. Steel tubing: 6 mm O.D. (x 4 mm I.D.) = (12.57 cm 3 / m) x (______ m) =_ ________________________ (cm 3 ) S. Steel tubing: 8 mm O.D. (x 5 mm I.D.) = (19.36 cm 3 / m) x (______ m) =_ ________________________ (cm 3 ) T. Flexible Hose: 4.8 mm I.D. = (18.10 cm 3 / m) x (______ m) = ________________________________ (cm 3 ) U. Flexible Hose: 9.53 mm I.D. = (71.25 cm 3 / m) x (______ m) =_ ______________________________ (cm 3 ) V. Total of lines (9-R) thru (9-U) =____________________________________________________ (cm 3 ) 10. Estimated total fluid in system = lines (2-E) + (5-J) + (6K or 6L) + (7-Q) + (9-V) = ____________________ (cm 3 ) 11. Approximate fluid compression factor = [line (10)] x [line (1) ÷ 17575] =_ ___________________________ (cm 3 ) 12. Second stage pump flow rate (slower - cm 3 /min, higher pressure) from the corresponding pump specifications page or Vektek catalog: _______________________________________________ (cm 3 /min) 13. Approximate time to achieve high pressure function = [line (8) + line (11)] ÷ line 12 x 60 =_________________ (seconds) 14. Estimated position and clamp time {** below} = line (4) + line (13) + 1.25 (motor control performance factor) = _ _________________________________________________________ (seconds) Note: * Not all hose manufacturers provide this information however, some logical value must be added to accommodate the hose“swell” volume when pressurized. See the hose chart in the “inch” section of the Vektek web site for examples. ** Flow rates will be additionally influenced by the style and number of fittings, control valves, specialty valves, manifolds, hose connectors and quick connects. Final positioning and clamping time can vary slightly from the above calculated times due to actual physical plumbing installation.
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