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Jadwal Training 31 Maret – 2 April 2015 di BANDUNG

To reduce the effect of these load disturbances, sensors and transmitters collect information about the process variable and its relationship to some desired set point. A controller then processes this information and decides what must be done to get the process variable back to where it should be after a load disturbance occurs. When all the measuring, comparing, and calculating are done, some type of final control element must implement the strategy selected by the controller.
The most common final control element in the process control industries is the control valve. The control valve manipulates a flowing fluid, such as gas, steam, water, or chemical compounds, to compensate for the load disturbance and keep the regulated process variable as close as possible to the desired set point.
Many people who talk about control valves or valves are really referring to a control valve assembly. The control valve assembly typically consists of the valve body, the internal trim parts, an actuator to provide the motive power to operate the valve, and a variety of additional valve accessories, which can include positioners, transducers, supply pressure regulators, manual operators, snubbers, or limit switches.
Whether it is called a valve, control valve or a control valve assembly is not as important as recognizing that the control valve is a critical part of the control loop. It is not accurate to say that the control valve is the most important part of the loop. It is useful to think of a control loop as an instrumentation chain. Like any other chain, the whole chain is only as good as its weakest link. It is important to ensure that the control valve is not the weakest link.
Following are definitions for process control, sliding-stem control valve, rotary-shaft control valve, and other control valve functions and characteristics terminology.

OBJECTIVE

OUTLINE
Introduction to Control Valves
What Is A Control Valve?│Process Control Terminology│Sliding-Stem Control Valve Terminology│Rotary-Shaft Control Valve Terminology│Control Valve Functions and Characteristics Terminology

Control Valve Performance
Dead Band│Actuator-Positioner Design│Valve Response Time│Valve Type And Characterizatione.│Valve Sizing

Valve and Actuator Types
Control Valves│Control Valve End Connections│Valve Body Bonnets│Control Valve Packing│ Characterization of Cage-Guided Valve Bodies│Valve Plug Guiding, Restricted-Capacity Control Valve Trim│Actuators

Control Valve Accessories
Positioners│Other Control Valve Accessories

Control Valve Selection
Valve Body Material│Designations for the High Nickel alloys│Pressure-Temperature Ratings for Standard Class│Face-to-Face Dimensions│Control Valve Seat Leakage Classifications│Control Valve Flow Characteristics│Valve Sizing│Non-Destructive Test Procedures│Cavitation and Flashing

Special Control Valves
High Capacity Control Valves│Low Flow Control Valves│High-Temperature Control Valves│Cryogenic Service Valves│Customized Characteristics and Noise Abatement Trims│Valves Subject to Sulfide Stress Cracking

Installation and Maintenance
Proper Storage and Protection│Proper Installation Techniques│Control Valve Maintenance│Actuator Diaphragm, Stem Packing│Seat Rings│Bench Set.

Troubleshooting

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