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Technical information Controls and Other Circuit Components Shut-off valves

Shut-off valves

Manual shut-off valves entire chain resolution isolation in case of partial use, maintenance or repair (see Fig and 9.8 9.9).

Small valves, which will be involved often have packless gland, or a diaphragm or bellows, and flywheel. All valve sizes that are only used from time to time be sealed with o-rings. As a protection from leakage, they have not installed the flywheel, and the stem of the protective cover, which can be resolved only when the valve is controlled. Stem apartments will work with a wrench. Most of these valves back seat allow a change to the o-rings.

The valve must not be installed petiolate, like any inside dirt gets in the spindle thread. In conditions of low temperatures, ice will form on the spindle and will be forced into cancer, if the valve is controlled by quickly. In such circumstances, the spindle should be a well-oiled, or ice melted from the first.

Service valves for small compressors, as a rule, provide connections for pressure switch or sensor or for the temporary installation of sensors, as well as for charging line to maintain. Valve seats to close this port during the sensors have been installed. Valve seat inserts are, as a rule, soft metal or plastic resistant such as PTFE. Ball valve, Fig. 9.9, sometimes used for the safe isolation of plots and schemes have low pressure drop in the open space.

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