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A piston actuator includes a transfer assembly and an actuator assembly connected to the transfer assembly. The actuator assembly has a cylinder assembly with a side wall and an end wall and defines a cavity. A piston assembly is disposed within the cavity and a screw guide assembly is secured to th

A piston actuator includes a transfer assembly and an actuator assembly connected to the transfer assembly. The actuator assembly has a cylinder assembly with a side wall and an end wall and defines a cavity. A piston assembly is disposed within the cavity and a screw guide assembly is secured to the end wall of the cylinder assembly such that the screw guide assembly is adjustable to limit the travel of the piston assembly.

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1. A piston actuator, comprising: a transfer assembly; andan actuator assembly connected to the transfer assembly, the actuator assembly comprising: a cylinder assembly comprising a cylinder having a side wall and an end wall, the cylinder assembly defining a cavity;a piston assembly disposed within

1. A piston actuator, comprising: a transfer assembly; andan actuator assembly connected to the transfer assembly, the actuator assembly comprising: a cylinder assembly comprising a cylinder having a side wall and an end wall, the cylinder assembly defining a cavity;a piston assembly disposed within the cavity of the cylinder assembly; anda screw guide assembly secured to the end wall of the cylinder assembly; whereinthe screw guide assembly is adjustable to limit a travel of the piston assembly; andthe screw guide assembly comprises:a screw guide inserted through an aperture in the end wall of the cylinder and secured to the cylinder, the screw guide comprising a threaded bore extending longitudinally through the screw guide, a threaded external surface, and a flange positioned within the cylinder and engaging the end wall of the cylinder;an O-ring positioned between the flange of the screw guide and the cylinder to provide a fluid tight seal between the screw guide and the cylinder;a nut threaded onto the threaded external surface of the screw guide to secure the screw guide to the cylinder;a travel stop comprising a solid cylindrical rod having a threaded external surface, the travel stop threaded into the threaded bore of the screw guide; anda jam nut threaded onto the threaded external surface of the travel stop to secure the travel stop and prevent movement of the travel stop once a location of the travel stop has been set. 2. The piston actuator of claim 1, wherein the transfer assembly is a rotary transfer assembly that converts a linear movement of the actuator assembly into rotational movement of a rotational valve. 3. The piston actuator of claim 1, wherein the travel stop comprises: a second end configured to engage the piston assembly at a maximum travel of the piston assembly; anda first end configured to receive a tool to rotate the travel stop. 4. An actuator assembly for a piston actuator, the actuator assembly comprising: a cylinder assembly comprising a cylinder having a side wall and an end wall, the cylinder assembly defining a cavity;a piston assembly disposed within the cavity of the cylinder assembly; anda screw guide assembly secured to the end wall of the cylinder assembly; wherein the screw guide assembly is adjustable to limit the travel of the piston assembly; andthe screw guide assembly comprises:a screw guide inserted through an aperture in the end wall of the cylinder and secured to the cylinder, the screw guide comprising a threaded bore extending longitudinally through the screw guide, a threaded external surface, and a flange positioned within the cylinder and engaging end wall of the cylinder;an O-ring positioned between the flange of the screw guide and the cylinder to provide a fluid tight seal between the screw guide and the cylinder;a nut threaded onto the threaded external surface to secure the screw guide to the cylinder;a travel stop comprising a solid cylindrical rod having a threaded external surface, the travel stop threaded into the threaded bore of the screw guide; anda jam nut threaded onto the threaded external surface of the travel stop to secure the travel stop and prevent movement of the travel stop once a location of the travel stop has been set. 5. The actuator assembly of claim 4, wherein the travel stop comprises: a second end configured to engage the piston assembly at a maximum travel of the piston assembly; anda first end configured to receive a tool to rotate the travel stop. 6. An adjustable screw guide assembly for a piston actuator, the screw guide assembly comprising: a screw guide adapted to be inserted through and secured to a cylinder of the piston actuator, the screw guide comprising a threaded bore extending longitudinally through the screw guide, a threaded external surface, and a flange positioned within the cylinder of the piston actuator and engaging an end wall of the cylinder;an O-ring positioned between the flange of the screw guide and the cylinder to provide a fluid tight seal between the screw guide and the cylinder;a nut threaded onto the threaded external surface of the screw guide to secure the screw guide to the cylinder;a travel stop comprising a solid cylindrical rod having a threaded external surface, the travel stop threaded into the threaded bore of the screw guide; anda jam nut threaded onto the threaded external surface of the travel stop to secure the travel stop and prevent movement of the travel stop once a location of the travel stop has been set. 7. The adjustable screw guide assembly of claim 6, wherein the travel stop comprises: a second end configured to engage a piston assembly of the piston actuator at a maximum travel of the piston assembly; anda first end configured to receive a tool to rotate the travel stop. 8. A method for adjusting a limit of travel of a piston in a piston actuator, comprising the steps of: inserting a screw guide through an aperture in a cylinder of the piston actuator such that a flange of the screw guide is positioned within the cylinder and engages an end wall of the cylinder;positioning an O-ring between the flange of the screw guide and the cylinder to provide a fluid tight seal between the screw guide and the cylinder;threading a nut onto a threaded external surface of the screw guide to secure the screw guide to the cylinder;threading a travel stop into a threaded bore of the screw guide, the travel stop comprising a solid cylindrical rod;rotating the travel stop to set the limit of travel for the piston; andsecuring the travel stop by threading a jam nut onto an external threaded surface of the travel stop to prevent movement of the travel stop once the limit of travel for the piston has been set.