The content of the main valve body leak detection leak, seal leakage of two parts, the main valve manufacturer is testing and testing, the secondary sector there are important projects valve pressure testing.
1, the valve leaks introduced ultrasonic testing
When the valve leaks or failure, on many occasions in product quality, safety and energy consumption is very expensive waste and loss. Fluid flow through the valve operation of the system. And flow through several different ways will be very different, especially for special valves (such as control valves and regulating valves). Leak detection methods, such as the general method of absolute pressure, differential pressure method, bubble law, complex operation and high technical personnel requirements, and do not have real-time. Currently, the industry has used the principle of leakage for generating ultrasonic leak detection. Is the use of ultrasonic detection of gas leaks, not only simple, and accurate can be.
2, valve hydraulic test stand test description
a.JWT type top pressure hydraulic valve pressure test device suitable for welding-type valves, replace the seal plate can also be used for such flange and threaded valve high pressure, high pressure performance test, the hydraulic oil Top-pressure method of compression cylinder work. The device system configuration of high and low pressure pumps supply device, the test medium circulating storage use, and with the pressure test safety devices.
b.JWZ type of hold-type leak test bench used to locate the valve flange end, activities against the back of the clamping claws clamping flange method of work. Valve effect on the measured test results without additional external forces, in line with national standards for the valve testing requirements.
The test-bed structure can be divided into the hydraulic system, electrical control systems, left and right gripper table activities, and hydraulic pressure supply device and medium circulation system and other components. Clamping table with the right and 90 degree flip body clamping device by the clamping jaws and radial composition of mobile devices, the jaws of the clamping device is used to achieve the direct drive of the cylinder, so that all Claw Force uniform, reliable clamping. Radial gripper mobile device is a lever-type structure to achieve simultaneous radial movement of the claw. The left of the table can automatically advance and retreat. And has good performance, simple structure and so on. Hydraulic electric control system (see the hydraulic and electrical schematics) installed in the bottom bracket, the control section is to test the station, under the joint control with the electrical agencies to coordinate actions to meet the requirements of the valve testing procedures.
Valve leak detection test analysis shows
The valve body and seal leakage and failure, the valve may be in product quality and safety and energy consumption is very expensive. Quick closing of fluid flow through the valve system approach. Through different ways because there will be a big difference, especially for special valves (such as control valves and safety valves). UltraProbe makes it easy to adjust these differences and determine the line valve operation. The traditional method of leak detection methods, such as absolute pressure, differential pressure method, bubble law, complex and during operation of the technical staff are higher, and do not have real-time, and now widely used industrial pipe valve leaks in ultrasound principle to carry out leak detection test. Using ultrasonic detection of gas leaks, not only simple, and accurate can be. Valve is still in use, the use of ultrasonic contact (stethoscope) can easily probe accurately detect leakage or obstruction. Liquid or gas through the valve has produced little or no disorder. The case of valve leakage, leakage of gas or liquid from high pressure areas to low pressure areas flow, low pressure or downstream side in the produce turbulence, resulting in white noise, white noise of the ultrasonic component of this than the audible band even more. Leakage of the valve body can hear ultrasonic signal generated (by heterodyne conversion), also identified by the future value of the screen, the sound changes depending on the valve seat leakage of liquid or gas density, the number of cases heard as the subtle sound of Resources sometimes like a big noise, sound quality depends on the liquid viscosity and the internal pipe pressure. For example, low to medium pressure water flow through the valve is easy to distinguish the sound of water. However, the rapid adoption of high-pressure part of the open water valve, sounds like steam.