N2 Fitting and Machining Theory|Hands-On! 171


receiver to a point close to where the tools are used, and then a flexible section of piping for the last few meters.


• Valves play a major role in pneumatic systems. Figure 15.3(a) shows two views of a one-way delivery valve. Figure 15.3(b) shows a pressure-relief valve with pre-set relief pressure.


Figure 15.3(a) Views of a one-way delivery valve


Figure 15.3(b) Pressure-relief valve


• Control valves are required to direct the air flow in both volume and direction. A number of these valves are shown below.


• A sequence valve is shown in Figure 15.5(a). Tese valves are essential for controlling pneumatic systems where operations take place in a certain sequence. Figure 15.5(b) is an inline lubricator.


pressure adjustment


drain spring


balanced spool


outlet inlet


internal pilot


Figure 15.5(a) Sequence valve Figure 15.5(b) Inline lubricator


Figure 15.4 Various control valves


feed-rate adjustment


sight glass inlet


bypass valve


capillary tube


fill plug venturi


outlet


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