Blasting test mainly refers to the 60 70s, the pressure can be more evenly raised seal pipe until the pipe burst. Blasting system through the proportional relief valve to provide a uniform rise in pressure, proportional relief valve current can be used to control the flow of excessive pressure, the proportion of the system set the maximum overflow relief valve pressure relief 5MPa, when the current changes in the O-10mA , The overflow pressure in 0 a 15MPa corresponding changes.
The test first start high-pressure plunger pump, pumping sand while the control system at the same time set by the rate of pressure relief valve to send the current signal is raised, the sample was uniformly increased internal pressure, differential pressure transmitter and test In series, the sample burst, due to the current limit, differential pressure transmitter at both ends of the differential pressure, and then send out electrical signals, interrupt control system, the control system to lock the burst pressure, time, and close the high-pressure plunger pump , Stop the test.
Constant pressure system plastic pipe in 1000 hours long-term pressure test, the pipe seal due to a small amount of leakage, the pipe pressure will slowly decrease, so the test system must have the ability to constantly replenish the pressure to maintain the pressure inside the pipe stable. The main pressure source of the constant pressure system adopts high pressure nitrogen gas cylinder, the initial internal pressure is up to 14MPa. In order to control the precision, the pressure reducing valve is divided into two steps, the highest pressure of the first gear is 3MPa and the highest pressure of the second gear is 1OMPa. The first set of pressure relief valve test for the specified pressure throughout the test process, as long as the nitrogen bottle pressure is higher than the specified pressure, the outlet pressure remains unchanged. At the beginning of the test, the control system first detects the water level of the gas-liquid pressure exchanger. If the water level does not reach the highest water level, the exhaust gas solenoid valve is opened and the water supply pump is started. The corrosion-resistant abrasion-resistant mortar pump is a gas-liquid pressure exchange Refill water.
When the control detects the water level reaches the highest position, turn off the water supply to the pump, stop replenishment, turn off the exhaust solenoid valve, and then open the inlet solenoid valve. When the test specimen is damaged, the differential pressure transmitter interrupt control system, record the test time, turn off the inlet solenoid valve and the intake solenoid valve, open the exhaust solenoid valve, start to replenish the water pump, replenishment until the water level reached the highest position, When the test time to the specified time or press the stop button during the test, the control system that closes the inlet solenoid valve and the intake solenoid valve. This method is completely suitable for long-term specimens in the static pressure holding state.
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Shuyang County Huji town Desheng hydraulic machinery factory , https://www.dshydraulic.com