Two-way Valve Constant-flow Source Characteristic
The two-way valve is merely a throttling valve having one variable-area orifice. When used in conjunction with a constant-flow source, the two-way valve can be used to position a piston actuator &s shown by Fig. 1.22. As indicated, a return spring or an external force is required to return the piston in the one direction. The control pressure and the pressure of the constant-flow source will be the same.
The pressure-flow characteristics for this type of valve are given by Fig. 1.23. The range of opera.tion for the two-way valve is very limited and becomes very nonlinear in one direction. Its only advantage is the simplicity of the control components and reduced power consumption.
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