Pneumatics

Start with the working pressure of the air network, typically 0.4 to 0.7 MPa, and the port thread such as G1/8, G1/4 or Rc. These two values decide whether cylinders, valves, fittings and FRL units fit together. Only then move to device-specific dimensions such as bore, stroke or flow rate.

G (BSPP) is a parallel pipe thread sealed by a gasket or bonded washer on the face. R and Rc are ISO 7 taper threads that seal on the thread itself with PTFE tape or sealant. NPT is the American taper with a 60 degree flank instead of 55 degrees, so it does not mate with R even though the diameters are close.

Send the full part number printed on the body, a photo of the label and the quantity to sales@kit.com.vn. If the code is worn off, give the bore, stroke, port thread and working pressure. KIT supplies CO/CQ on request with the quotation.

ISO 8573-1 classifies compressed air by three contaminants: particles, water and oil. Most industrial cylinders and valves run well on air filtered to 5 micron and dried by a refrigerated dryer. Instrumentation, spray painting and food packaging usually need a cleaner class with a coalescing oil filter.

The quickest method is a walk round while the line is stopped, when hissing is easy to hear, spraying soapy water on suspect joints to watch for bubbles. An ultrasonic leak detector finds small leaks even in a noisy shop. Another simple test is to shut off all loads and time how fast the receiver pressure drops.

Most industrial pneumatic equipment is designed around 6 bar and rated to roughly 10 bar maximum. Set the lowest pressure at which the machine still delivers enough force and speed, since every surplus bar costs compressor energy and increases leakage. Always check the maximum rating of the weakest component in the circuit.