Spool valve is the power stage of servo valve. The axial dimension error of spool valve orifice edge is one of the most important influencing factors to servo valve flow characteristic. Spool valve is composed of spool and sleeve, and an orifice is formcd by square orifice edge of valve sleeve and shoulder edge of valve spool. Due to the cylindrical structure, the axial runout could be caIled as the axial dimension error. Because of lacking in precision detective method in actual production process, the axial runout is usually neglected. In this paper, a method based on differential pressure pneumatic measurement is proposed and utilized in the measurement of orifice edge axial runout, Based on this non-contact mcthod an automotive measure device is developed. The method is of high accuracy and resolution. It is a new automatic process detective method for servo valve.
Process Measurement is a measuring method which is accompanied with process of the
manufacture of work piece. This paper puts forward a new concept of fluid process measurement, and
provides four types of fluid process measurements, which are, pressure pneumatic process
measurement, flow pneumatic process measurement, pressure hydraulic process measurement, and
flow hydraulic process measurement, and establishes the mathematical and physical modal for them.
This paper also provides an example of the application of this measurement method. This
measurement has a good prospect, because it can deal with the work pieces with high-precision,
complex shape and which are hard to be measured in the machining process.
We expound the finite element simulation and the key points of metal turning by the material properties of the stem in this paper, and select the proper material constitutive equation, then use the adaptive meshing technique, and then finite element modeling was carried out on the valve stem in the professional finite element software Advantedge FEM. The optimization scheme we designed of finite element simulation for the valve stem through the finite element software Advantedge FEM, and we research the influence of the amount of feed and speed cutting process about the cutting force and the cutting temperature.
Emulate and analyze the flow field of whole-quantity-type safety valve using CFX. Establish the test system of whole-quantity-type safety valve. Compare the simulation results and the experimental results. Verify the accuracy of the simulation results. Provide a theoretical basis for structural innovation and fault diagnosis of whole-quantity-type safety valve.
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