System Components System A 800 700 600 500 400 300 200 100 0 B 800 700 600 500 400 300 200 100 0 Bore size o20 o25 o32 o40 o40 o50 o63 o80 o100 o125 o140 o160 A B Double Check Spacer/Specifications Double check spacer part no. Applicable valve model Specifications Check Valve Operating Caution Cylinder Speed Chart Can hold an intermediate cylinder position for an extended time If the double check spacer with a built-in double check valve is combined, it will enable the cylinder to stop in the intermediate stroke and maintain its position for a long time without being affected by the leakage between the spools. . The combination of VFS21 0, VFS22 0 and a double check spacer can be used as prevention of falling at the stroke end but cannot hold the intermediate position of the cylinder. Series VFS2000 AN110-01 (S = 35 mm2) AS3000-02 (S = 12 mm2) Tube bore x Length T0604 x 1 m T1075 x 1 m System Solenoid valve Speed controller Silencer 1 8 Series VFS2000 AN110-01 (S = 35 mm2) AS4000-02 (S = 21 mm2) Plug-in type Non plug-in type VVFS2000-22A-1 VVFS2000-22A-2 VFS2400-�ｭF VFS2410-�ｭ GETD Double check spacer Average speed (mm/s) Series CM Pressure 0.5 MPa Load factor 50% Stroke 300 mm Series MB, CA2 Pressure 0.5 MPa Load factor 50% Stroke 500 mm Series CS1/CS2 Pressure 0.5 MPa Load factor 50% Cylinder stroke 1000 mm Use as a guide for selection. Please confirm the actual conditions with SMC Sizing Program. . It is when the cylinder is extending that is meter-out controlled by speed controller which is directly connected with cylinder, and its needle valve with being fully open. . The average velocity of the cylinder is the value that the stroke is divided by the total stroke time. . Load factor: ((Load mass x 9.8)/Theoretical force) x 100% Perpendicular, upward actuation Horizontal actuation Rc Rc 1 4 Cylinder pressure Check valve Operating range Cylinder pressure P2 (MPa) Piston SUP side pressure (P1) . In the case of 3 position double check valve (VFS26�ｭ0), check the leakage from piping and fittings in between valve and cylinder by means of synthetic detergent solutions, and ensure that there is no such leakage found there. Also check the leakage from cylinder seal and piston seal. If there is any leakage, sometimes the cylinder, when valve is de-energized, can move without stopping at intermediate position. . Be aware that if the exhaust side is restricted excessively, the intermediate stopping accuracy will decrease and will lead to improper intermediate stops. . Combining double check spacer with external pilot will not work. 01 01 SUP side pressure P1 (MPa) 1486 Series VFS2000