Hydraulic sequencing valve application

Let us consider a hydraulic circuit in which two cylinders are used to execute two separate operations as shown in Figure 6.24.

sequencing-valve-application

Now, let us assume that cylinder A is required to extend completely before cylinder B extends. This can be accomplished by placing a sequencing valve just before cylinder B as shown. The pressure value of the valve is set to a predetermined value say 28 kg/cm2 (400 psi). This ensures that the operation involving cylinder B will occur after the operation involving cylinder A or in other words, cylinder B will not extend before a pressure of 28 kg/cm2 (400 psi) is reached on cylinder A.

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