By LLC Fisher Controls International, Emerson Process Management
Keep an eye on Valve guide via Fisher/Emerson method administration. 4th version, 2005.
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Additional resources for Control Valve Handbook Fourth Edition (Fisher, Emerson Process Management)
Sample text
Globe Valves Single-Port Valve Bodies D Single port is the most common valve body style and is simple in construction. D Single-port valves are available in various forms, such as globe, angle, bar stock, forged, and split constructions. D Generally single-port valves are specified for applications with stringent shutoff requirements. They use metal-to-metal seating surfaces or 41 Chapter 3. Valve and Actuator Types W7027-1/IL Figure 3-1. Single-Ported Globe-Style Valve Body soft-seating with PTFE or other composition materials forming the seal.
This method, however, also has its dynamic limitations. 1% signal change to the valve (that is, in the flat regions of the characterizing curve). Many control valves are unable to respond to signal changes this small. The best process performance occurs when the required flow characteristic is obtained through changes in the valve trim rather than through use of 36 cams or other methods. Proper selection of a control valve designed to produce a reasonably linear installed flow characteristic over the operating range of the system is a critical step in ensuring optimum process performance.
Instrument supply pressure can also have a significant impact on dynamic performance of the valve assembly. For example, it can dramatically affect the positioner gain, as well as overall air consumption. Fixed-gain positioners have generally been optimized for a particular supply pressure. This gain, however, can vary by a factor of two or more over a small range of supply pressures. For example, a positioner that has been optimized for a supply pressure of 20 psig might find its gain cut in half when the supply pressure is boosted to 35 psig.