http://www.cqm.rs/fq2006/pdf/A/48 - Nedic N. N. Prsic H. D.,...
Zaporna armatura je armatura predviđena samo za radne položaje ”zatvoreno” ili ”potpuno otvoreno”.

Pogledajte ovde molim vas, u zapornu armaturu spada veći broj različitih ventila (dato i na srpskom i na engleskom jeziku):
http://www.energogas.net/usluge/Komercijalni katalog GasTeh....
GRUPA 300 ZAPORNA ARMATURA

ISOLATING VALVES GROUP 300

http://en.wikipedia.org/wiki/Valve
Examples of normally open valves are isolation valves, which are usually only shut when there is a problem with a unit or a section of a fluid system such as a leak in order to isolate the problem from the rest of the system.

http://en.wikipedia.org/wiki/File:Compression_fitting_isolat...
Isolating valves are typically put before spurs, taps and suchlike. They make maintenance easier by removing the need to turn off and drain the plumbing system before work is carried out.

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Note added at 5 hrs (2010-11-26 13:51:52 GMT)
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Ovde je nabrojano koji sve ventili spadaju u zapornu armaturu (isolation valves):
http://www.engr.sjsu.edu/ndejong/Valve Selection.pdf
Basic Valve Types
Isolation valves: on/off valves
- Typically operated as fully open or fully closed
- Designed to have a tight reliable seal during shut-off and minimal flow restriction when open
Switching valves: converge or divert flow in a piping system
Control valves: used to modulate flow (i.e., vary flow by opening
...
Isolation Valves
U produžetku su nabrojani različiti tipovi:
Ball valve
Can be actuated with pneumatic and electric actuators
...
Plug valve
...
Butterfly valves
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Diaphragm valves
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Float valves
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Gate valves
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Globe valves
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Solenoid valve