Hydraulic cylinder Tie Rod Design - imperial - Duncan Rogers

PORTING AND AIR BLEEDS1 2 3 4 5Bore1 1 /81 1 /222 1 /23 1 /445678101214MMRodDia.5 /8 std.5 /8 std.1 2:11 std.1 3 /8 2:11 std.1 3 /81 3 /4 2:11 3 /8 std.1 3 /42 2:11 3 /4 std.22 1 /2 2:12 std.2 1 /233 1 /2 2:12 1 /2 std.33 1 /24 2:13 std.3 1 /244 1 /25 2:13 1 /2 std.44 1 /255 1 /2 2:14 1 /2 std.55 1 /27 2:15 1 /2 std.78 2:17 std.10 2:1Std.Port1 /41 /21 /21 /21 /21 /21 /21 /23 /43 /43 /43 /43 /43 /43 /43 /43 /43 /411111 1 /41 1 /41 1 /41 1 /41 1 /41 1 /21 1 /21 1 /21 1 /21 1 /222222 1 /22 1 /22 1 /22 1 /22 1 /2Max.Port3 /8*3 /43 /43 /4*3 /4*3 /4*3 /4*3 /4*3 /43 /41*3 /43 /41*3 /41*1*1*1 1 /4*1 1 /4*1 1 /4*1 1 /4*1 1 /21 1 /21 1 /21 1 /21 1 /2222222 1 /22 1 /22 1 /22 1 /2* “Y” and “P” dimensions as shown onmounting dimensions pages change toaccommodate these port sizes.33333Max.S.A.E.ST THD.Port-6-10-10-10-10-10-10-10-12-12-12-14-14-14-14-14-14-14-16-16-16-16-24-24-24-24-24-24-24-24-24-24-32-32-32-32-32-32-32-32-32PortingBSP Ports, located in positions 1 and 5(See "Position Diagram for Ports") arestandard and will be furnished unlessotherwise specified. Other types and sizesof ports are available on request.Port PositionsWhere mounting clearances permit, theports can be had in any of four positionsin the head and in the cap at no extracost. Indicate both port positions desiredby position number. If no preference isstated, ports will be furnished in positions1 and 5. NOTE: The head and cap can berotated in relation to each other as longas mounting and porting are convenientfor installation.Port SizesStandard port sizes are as shown inColumn 3 on the adjacent chart. Unlessotherwise specified, those sizes are whatwill be furnished. Smaller than standardports can be supplied at no extra cost. Itis recommended that cylinders be orderedwith ports no larger than needed so thatthe trouble and expense of obtaining andinstalling reducing fittings can be avoided.At a modest cost, larger than standardports, as shown in Column 4, can befurnished. While these larger ports can beput in a standard cylinder, it is necessaryin some cases to slightly alter the ”Y“ andthe ”P“ dimensions shown on ourmounting dimension pages. Contact thefactory for those dimensional changes.POSITION DIAGRAM FOR PORTSAND AIR BLEEDS.S.A.E. Straight Thread PortsS.A.E. straight thread ”O“ ring sealedports are available at no extra cost. Thistype of port offers positive seal with fullthread engagement. It also eliminates theproblem of faulty pipe threads sincesealing takes place independently of thethread. No messy pipe dope to botherwith or to contaminate the hydraulicsystem. No wedging, distortion, orbreakage due to over-tightening.Alignment and full sealing are bothassured since the fittings can betightened after “lining up”. Straightthread fittings may be re-used,indefinitely. Column 5 shows themaximum size of S.A.E. port that can befurnished in a standard cylinder.Air BleedsAn air bleed may be ordered at either orboth ends of the cylinder as an option. Toprovide for maximum bleeding of airfrom the cylinder, air bleeds are placed inthe tube to bleed air from the tube/heador tube/cap juncture. The air is bled fromthe cylinder by backing out the straightthread metallic seal plug to allow air topass by the threads. When air bubblesstop and oil starts to flow, re-tightenplug. It is recommended that bleeding bedone with pressure on the opposite endof the cylinder so that the bleed plug isnot subjected to pump pressure whenbeing backed out. Air bleeds shouldalways be positioned at the highest pointof the cylinder tube. Please specifypositions of air bleeds by position numberfrom the chart. NOTE: Since air bleeds areplaced in the cylinder tube, position canbe changed by loosening the tie rods androtating the tube. Line drawing showsports in positions 1 and 5.14