Abstract:
Control fluid power apparatus and related methods are disclosed. An example control fluid power apparatus includes a first housing having a first piston defining a first chamber and a second chamber, where the first chamber receives a control fluid and the second chamber receives a process fluid from a process system. The first chamber is oriented above the second chamber when the control fluid power apparatus is coupled to a control valve assembly. A second housing has a second piston defining a third chamber and a fourth chamber, where the third chamber receives the control fluid and the second chamber receives the process fluid. The third chamber is oriented above the fourth chamber when the control fluid power apparatus is coupled to the control valve assembly.
Abstract:
Methods and apparatus of using customizable templates in process control systems are disclosed. An example method includes initializing a first process control device associated with a first protocol based on a template file and a first parameter definition file. The template file includes global variables and associated values. The first parameter definition file defines a relationship between the global variables and first local variables of at least one of the first process control device or the first protocol. The example method also includes initializing a second process control device associated with a second protocol based on the template file and a second parameter definition file. The second parameter definition file defines a relationship between the global variables and second local variables of at least one of the second process control device or the second protocol. The first protocol is different from the second protocol.
Abstract:
Example apparatus for absolute position detection are disclosed. An example apparatus includes a housing and digit gears coupled to the housing to rotate about respective parallel axes. Each digit gear has a first portion including a first set of teeth disposed about an entire circumference of the first portion and a second portion including a second set of teeth disposed about only a portion of a circumference of the second portion. Each digit gear is to correspond to a respective digit in a code representing an absolute position of a shaft. A respective idler gear between each adjacent pair of the digit gears is to be intermeshed with the first set of teeth of one of the digit gears and the second set of teeth of the other one of the digit gears.
Abstract:
Methods and apparatus for changing actuator output torques are disclosed. An example method includes decoupling a first end cap from a body of an actuator. A first spring assembly is positioned within a first outer chamber defined by the first end cap and the body. A first end of the first spring assembly is positioned adjacent a surface of a first piston. A second end of the first spring assembly is positioned adjacent the first end cap when the first end cap is coupled to the body. The method includes positioning a first spacer within the first outer chamber and coupling the first end cap to the body. The first spacer changes a distance between the first and second ends of the first spring assembly when the first end cap is coupled to the body to change an output torque of the actuator.
Abstract:
Apparatus that prevent side load in hydraulic override pumps are disclosed herein. An example apparatus includes a lever rotatably mounted to a support, a pump cylinder rotatable about a first end of the pump cylinder, and a pump rod operatively coupled to the lever to move within the pump cylinder based on rotation of the lever, wherein the pump cylinder rotates when the pump rod moves within the pump cylinder.
Abstract:
The present disclosure envisages a system and method for self-calibration of an actuator. The system comprises a pressure spike sensing and control circuit, a travel limit setting circuit and a profile generation circuit. The pressure spike sensing and control circuit is configured to check and set an operating pressure of the actuator. The travel limit setting circuit is configured to check and set the travel limit of the actuator. The profile generation circuit is configured to generate the profiles of a set of parameters of the actuator.
Abstract:
Rotary valve actuators having partial stroke damping apparatus are described herein. An example rotary valve actuator described herein includes a housing containing a first piston and a second piston opposite the first piston, where the pistons move in opposite directions to rotate a shaft of the rotary valve actuator. A damper is operatively coupled to at least one of the first piston or the second piston to slow the movement of the piston for only a portion of a stroke of the rotary valve actuator.
Abstract:
Se describen en la presente actuadores de válvulas rotatorias que tienen aparatos de amortiguación de recorrido parcial. Un actuador de válvula rotatoria ejemplar descrito en la presente incluye una carcasa que contiene un primer pistón y un segundo pistón opuesto al primer pistón, donde los pistones se mueven en direcciones opuestas para hacer rotar un eje del actuador de válvula rotatoria. Un amortiguador se acopla operativamente a al menos uno del primer pistón o el segundo pistón para disminuir la velocidad del movimiento del pistón solamente para una porción de un recorrido del actuador de válvula rotatoria.
Abstract:
Rotary valve actuators having partial stroke damping apparatus are described herein. An example rotary valve actuator described herein includes a housing containing a first piston and a second piston opposite the first piston, where the pistons move in opposite directions to rotate a shaft of the rotary valve actuator. A damper is operatively coupled to at least one of the first piston or the second piston to slow the movement of the piston for only a portion of a stroke of the rotary valve actuator.