Definition of Symbol The abbreviations F.O.F. / P.T. / O.T. / T.T. shown in this catalog are detailed below. F.O.F. P.T. O.T. T.T. P.T. O.T. T.T. !F.O.F. Required force to total travel position !P.T. From free position to initial valve operating position !O.T. From initial valve operating position to total travel position !T.T. From free position to total travel position Design Warning 1. This product cannot be used for applications in which the pressure must be sealed. Since the VM100 and VM200 are poppet type valves, fluid flows backward when the pressure on port 2 (A) rises. Since the valves are subject to air leakage, they cannot be used for applications such as holding pressure (including vacuum). 2. Not suitable for use as an emergency shutoff valve This mechanical valve is not designed for safety applications such as an emergency shutoff valve. If the valves are used for the mentioned applications, additional safety measures should be adopted. Mounting Warning 1. When installing the mechanical operation type mechanical valves, adjust the position so that the valves do not operate over the operating limit range. Operating over the limit could damage the mechanical valve or actuator, and lead to equipment malfunction. 2. P.T. depends on pressure or differences between the individual product specifications. In order to ensure that the valve opens, keep the operating stroke value for the mechanical operation type within the range specified by the following formula. Operating stroke = (P.T. + 0.5 x O.T.) to (P.T. + O.T. . 0.1) Operating Stroke Range Series Actuator type Operating stroke (mm) VM100 Basic 2.2 to 2.9 Roller lever 4.3 to 5.4 One way roller lever 4.3 to 5.4 Straight plunger 2.7 to 3.4 Roller plunger 2.7 to 3.4 Cross roller plunger 2.7 to 3.4 VM200 Basic 4 to 4.9 Roller lever 8.7 to 10.9 One way roller lever 9.5 to 11.9 Straight plunger 4.5 to 5.4 Roller plunger 4.5 to 5.4 Cross roller plunger 4.5 to 5.4 For straight and roller plunger types, there is a groove indicating P.T. and T.T. for stroke adjustment. T.T. O.T. P.T. T.T. O.T. P.T. 3. Do not make any alterations to the valve body, such as enlarging the body mounting holes. As doing so could lead to unexpected abnormal conditions such as air leakage. Operation Warning 1. Operate the manual operation type mechanical valves (such as push button, twist selector and toggle lever types) with your finger. The use of equipment such as a cylinder, cam or hammer, can result in the actuator and the valve being damaged. Do not operate over the operation limit. If excessive operation force is applied over total travel position, actuator part can get deformed and lead to equipment malfunction. Series VM100/200 Specific Product Precautions 1 Be sure to read before handling. Refer to back cover for Safety Instructions and “Handling Precautions for SMC Products” (M-E03-3) for 3/4/5 Port Solenoid Valve Precautions. Mounting Warning 23