asamson自力式控制阀手册.pdf

文档介绍：Self-operated Regulators Introduction to
Part 2 Self-operated Regulators 2
Technical Information
Technical Information
Part 1: Fundamentals
Part 2: Self-operated Regulators
Part 3: Control Valves
Part 4: Communication
Part 5: Building Automation
Part 6: Process Automation
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Part 2 ⋅ L202 EN
Introduction to Self-operated
Regulators
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Fields of Application . . . . . . . . . . . . . . . . . . . . . . . . . 7
Functional Principle . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Adjusting the operating point . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Pressure balance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Control Properties . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Appendix A1: Additional Literature. . . . . . . . . . . . . . . . . . 20
00/07
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SAMSON AG
CONTENTS
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Self-operated Regulators ⋅ Introduction to Self-operated Regulators
V74/ HRB
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SAMSON AG
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Part 2 ⋅ L202 EN
Introduction
The control of a process variable requires three basic functional units – the
measuring equipment, the controller, and the final controlling equipment –
as well as the knowledge of how to make proper use of the individual belon-
ging elements. Usually, these control ponents are separate devices
that must be supplied with auxiliary energy (Fig. 1; see also lit. [1] and [2]). control with...
For simple pressure, flow, differential pressure, or temperature control tasks,
such instrumentation is often plex and, from an economic point of
view, too expensive. For these applications, self-operated regulators can be
used.
Self-operated regulators take