Three components of micro opening spring safety valve

The on-line detection system is composed of mechanical fixture, hydraulic power unit and data acquisition and processing unit, which are relatively independent of each other. It is composed of two 10 meter long hydraulic hoses and two 10 meter long five core shielded cables, which are connected with each other to form a complete micro opening spring safety valve test system. It is characterized by small volume, light weight, modularization of components, computerization of equipment, simple operation, stability and reliability, and its performance is superior to that of similar instruments abroad in many aspects. . 1 clamp: ensure that the safety valve of the spring type safety valve to be tested is clamped and positioned to provide an environment for external force application for the hydraulic power unit. The combined structure is very convenient for disassembly. (see Fig. 3.2 hydraulic power unit: provide adjustable hydraulic output and flow, with a maximum output of 10MPa and a maximum lifting force of 50kN, to control the external lifting force and lifting speed. . 3 data processing unit: it is the core of the test system and directly determines the reliability and accuracy of the system. Among them, the force sensor is of spoke structure, with high sensitivity and accuracy of 0.05%. The pressure sensor is of high temperature type, with working temperature of 200-250 ℃. Both sensors are of high output type with built-in amplifiers, which have strong linearity, repeatability and anti-interference ability. The test system adopts two channels of low gain, high precision amplification circuit, intelligent a / D conversion and data acquisition circuit, which can collect two parameters of force and pressure at the same time. The core part adopts the advanced notebook computer (CPU P Ⅲ 600) on the market at present, which can draw the curve and print the test results. It has the man-machine dialogue function of Chinese characters, and the data of each measurement channel can be on the screen It shows that in case of over range, the safety of the system and the safety valve of the micro opening spring type safety valve is ensured. All the hardware adopts the modular structure, which is convenient for maintenance and debugging. This kind of valve should be installed horizontally in the pipeline.

Micro opening spring type safety valve computer low temperature worktable

In addition, in order to ensure the normal and continuous operation of the host in the high temperature environment of 50 ℃, the computer low temperature working table is specially designed. The operation steps are as follows: as shown in Figure 4, select the tested micro open spring safety valve safety valve, and install and connect the NSH components conveniently according to the system installation diagram; click "install parameters" on the computer main control window to select the tested micro open spring safety valve safety valve; (as shown in Figure 5), select the pressure sensor measurement method, and input the basic pressure value; after checking, single Click "re line constant pressure", and the system will prompt: "under test! Please wait! " Turn on the power switch of the hydraulic unit to the "on" position, adjust the "system pressure adjustment" knob to the "required oil pressure" value indicated by the computer; turn the reversing control knob to the "lift" position, so that the oil cylinder piston drives the stem of the valve under test to move upward; by observing the rising of the stem or hearing the sound of medium discharge, confirm that the valve has been opened, turn the reversing control knob back to the "reset" position Turn off the power at the position of "bit"; the computer will automatically enter the result display window (see Figure 6) to display the test curve, test time, opening pressure, adjusting height and other parameters; adjust the constant pressure nut according to the adjustment height prompted by the computer; click the "exit" button to restart the test program to get the new test curve and result. Repeat the above steps until the difference between the opening pressure and the setting pressure is not greater than the "allowable measurement error". At this time, the computer displays "adjustment completed", indicating the end of measurement.