Although most direction control valves are of spool type design, other types are also used. One such design is the rotary four-way valve, which consists…
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In earlier years, hydraulic systems were used as a means for removing the stress from structural members of bridges for effecting repairs and also for…
Servo valve bodies are machined with three common port shapes as shown in Fig. 11.13. The effect of port shape on flow is shown in…
The jet pipe design (Fig. 11.12) is less sensitive to contamination than the flapper nozzle. This design uses fluidics technology. A nozzle, attached to the…
A diagram of the double flapper nozzle is shown in Fig. 11.10. Supply pressure (the setting of the relief valve or the setting of a…
There are four basic servo systems as shown in Fig. 11.7. The two servo-actuator systems are (1) valve-motor and (2) valve-cylinder. These systems are often…
Feedback is an intuitive concept. Each time we reach for an object, we slow our hand as it approaches the object so that it is…
The pilot-operated check valve is shown in Fig. 7.11. For flow in the forward direction, this valve operates just like a normal check valve. Pilot…
Presses are used for molding, shaping, shearing, and many other operations. Some of the older manufacturing plants have lines of presses connected in parallel as…
The gear-type flow divider functions like two gear motors with their shafts rigidly attached. We will consider first the case in which both motors have…