Technology

  Hydraulic System basis Valve function The valve is provided with an internal control passage to evaluate the outlet pressure (at port B).  When sufficient pilot pressure is applied, the spool moves against the spring force and opens the valve, thus allowing the flow through the valve.  They are designed to operate efficiently under extreme conditions and within wide-ranging temperatures. Choosing the right hydraulic valve for your application is critical to securing the performance, reliability and lifespan of your system.  A pilot passage ‘x’ is provided in the valve to accept signals from the inlet to act on one side of the spool.  The flow path through the valve opens when the pressure at the pilot port increases beyond the pressure setting.  The main function of the counterbalance valve in a hydraulic circuit with a load-carrying actuator is to maintain the preset back pressure in the return line of the circuit, sufficient to balance the load held by ...

  Pneumatic valve System  The outlet of the pressure sequence valve remains closed until pressure upstream of it builds up to a predetermined value. The resistance can be reduced by expelling the exhausting air to the atmosphere quickly by using a Quick exhaust valve Pressure Control Valve Compared with hydraulic systems, few pressure control valves are brought into use in pneumatics. Pistons, on the other hand, are generally more rugged and provide a larger effective sensing area in a given size regulator. The types of actuation vary; Manually actuated Mechanically actuated Pneumatically/ air actuated Electrically actuated Combined actuation The symbols of the methods of actuation are detailed in DIN ISO 1219. When applied to a directional control valve, consideration must be given to the method of initial actuation of the valve and also the method of return actuation. In many applications especially with single-acting cylinders, it is a common practice to increase the piston...

  Hydraulic   Motors may produce either rotary or reciprocating motion in the load In the operation and control of machine tools, farm machinery, construction machinery, and mining machinery, fluid power can compete successfully with mechanical and electrical systems (see fluidics). Hydraulics deals with such matters as the flow of liquids in pipes, rivers, and channels and their confinement by dams and tanks. The motor may be a counterpart of the pump, transforming hydraulic input into mechanical output. This continuous and irrecoverable change of position of one part of the material relative to another part when under shear stress constitutes flow, a characteristic property of fluids. Thus, kinetic energy, deriving from motion, can be partly converted to pressure energy by enlarging the cross section of a pipe, which slows down the flow but increases the area against which the fluid is pressing Until the 19th century it was not possible to develop velocities and pressures mu...