17058732-Pneumatics-Part-2

17058732-Pneumatics-Part-2 - 7/3/2009...

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7/3/2009 1 Pneumatics Part 2 Compressed air systems, components and circuits By Amaren P. Das amaren.das@gmail.com Different types of actuation Manual Mechanical Pneumatic Electrica Manual NFC TS 2009 Pneumatics APDas 2 Electrical Combined ± Mechanical Pneumatic NFC TS 2009 Pneumatics APDas 3 Electrical Combined Poppet valve: long service life but large actuation force is required Ball valve Disk seat valve NFC TS 2009 Pneumatics APDas 4 Slide valve Longitudinal slide valve (spool valve) Longitudinal flat slide valve Plate slide valve
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7/3/2009 2 Has two ports and two position Rarely used except as an on off valve Normally of ball seat construction NFC TS 2009 Pneumatics APDas 5 Construction and working principal of 3/2 valve Explain the working principle of valve Find what the circuit does NFC TS 2009 Pneumatics APDas 6 3/2 normally closed ball seat 3/2 normally closed disk seat Controlling a single acting cylinder Hand operated Pilot actuation 12 pilot line Spring to reset Can be configured as NFC TS 2009 Pneumatics APDas 7 normally open or normally closed Has 4 port and 2 position Similar in construction to two 3/2 valve One valve normally closed other normally open NFC TS 2009 Pneumatics APDas 8
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3 4 ports and 3 position Center position blocked Can be used to hold cylinder at the middle of the stroke NFC TS 2009 Pneumatics APDas 9 Position of the cylinder is not accurate as extra load will change the position Types of 5/3 valve Blocked center The cylinder is fixed at its position when the valve is un actuated NFC TS 2009 Pneumatics APDas 10 Open center Generally used when the piston of the cylinder is to be moved by hand or some other tool during operation cycle Pressure center Same as the blocked center but any leak through the seals are compensated and pressure is always maintained Construction and working principal of 5/3 valve Has 5 working ports 3 switching positions If no signal is applied at NFC TS 2009 Pneumatics APDas 11 If no signal is applied at either of the two ports, the valve remains spring centered in the middle position Notice the two springs on both side in the symbol it is essential Stops flow in one direction and permits flow in the reverse direction NFC TS 2009 Pneumatics APDas
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This note was uploaded on 10/17/2009 for the course MET 387 taught by Professor Dean during the Spring '09 term at Old Dominion.

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17058732-Pneumatics-Part-2 - 7/3/2009...

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