Hydraulic control type test method for hydraulic balance valve

[0014] The technical solution of the present invention is further described below in conjunction with the accompanying drawings, but the scope of protection is not limited to the above.

[0015] Such as figure 1 As shown, the hydraulically controlled hydraulic balance valve of the present invention is mainly composed of a safety valve 1, a one-way valve 2, a back pressure regulating valve 3. The present invention also relates to a test method for a hydraulically controlled hydraulic balance valve, It is to first obtain the safety pressure value of the safety valve by adjusting and locking the safety valve, and then obtain the forward and reverse flow resistance of the hydraulic balance valve through the single-channel flow resistance test (forward channel and reverse channel). Finally, the flow resistance of the entire balance valve is calculated by shorting the oil port.

[0016] The working principle of the hydraulic control hydraulic balance valve of the present invention: figure 1 As shown in the figure, the safety valve 1 is integrated on the hydraulic balance valve, which is usually set during the factory test and cannot be adjusted at will; the back pressure regulating valve 3 is also integrated on the hydraulic balance valve, which can be adjusted within a certain range according to the workload capacity To meet the requirements of operating conditions. When working, the oil enters the hydraulic balance valve through the A1 port, flows through the A2 port, the working hydraulic components, the B2 port, and the B1 port to the hydraulic system tank. On the contrary, the working fluid enters the hydraulic balance valve through the B1 port. It flows through B2 port, working hydraulic components, A2 port, and A1 port back to the hydraulic system tank.

[0017] The process of adjusting and locking the safety pressure value of the safety valve: such as figure 2 As shown, the A2 and B2 ports of the hydraulic balance valve are plugged with screw plugs, port A1 (or B1) is connected to the test bench pressure oil P, port B1 (or A1) is connected to the test bench fuel tank, and the safety valve af1 is adjusted (Or af2) adjustment knob, read the setting pressure value of the safety valve from the pressure gauge P1 to the safety pressure value of the working system of the hydraulic balance valve, and lock the adjustment knob of the safety valve af1 (or af2); normally, the safety valve The set pressure value of the hydraulic balance valve is 10% to 30% higher than the rated working pressure value of the hydraulic balance valve to ensure that the hydraulic balance valve does not unload during normal operation.

[0018] The working principle of the flow resistance test of forward channel A1→A2 (or channel B1→B2): such as image 3 As shown, port A1 (or B1) is connected to the pressure oil P of the test bench, the oil flow rate Q is the rated flow of the hydraulic balance valve, and port A2 (or B2) is connected to the oil tank of the test bench. Connect pressure gauges P1 and P2 to the pipeline with a balance valve not larger than 200mm. Then the forward flow resistance of the single circuit of the hydraulic balance valve is: ΔP=P 1 -P 2 Under normal circumstances, the positive channel of the hydraulic balance valve is equivalent to an independent one-way valve. With reference to the opening pressure of the one-way valve, the positive one-way flow resistance should not be greater than (0.5 ~ 0.3) MPa.

[0019] Reverse channel A2→A1 (or channel B2→B1) flow resistance test working principle: such as Figure 4 As shown, for the hydraulic balance valve A2→A1 channel, plug B2 port with a screw plug, port A2 and port B1 are connected to the pressure oil P of the test bench, the oil flow Q is the rated flow of the hydraulic balance valve, and port A1 Connect the oil tank of the test bench, and connect the pressure gauge P to the pipeline where the distance between oil port A1, oil port A2 and oil port B1 is not more than 200mm from the hydraulic balance valve 1 , P 2 And P 3; For the hydraulic balance valve B2→B1 channel, plug A2 port with a screw plug, port B2 and port A1 are connected to the pressure oil P of the test bench, the oil flow Q is the rated flow of the hydraulic balance valve, and port B1 is connected for the test For an oil tank, connect the pressure gauge P to the pipeline where the distance between oil port B1, oil port B2 and oil port A1 is not more than 200mm from the hydraulic balance valve 1 , P 2 And P 3 , Then the reverse flow resistance of the single circuit of the hydraulic balance valve is: P=P 1 -P 2.

[0020] The working principle of the flow resistance test of the whole valve: Figure 5 As shown, the oil port A2 and oil port B2 of the hydraulic balance valve are directly short-circuited (the pipe length is as short as possible), the port A1 (or B1) is connected to the pressure oil P of the test bench, and the oil flow rate Q is the rated value of the hydraulic balance valve For flow rate, port B1 (or A1) is connected to the oil tank of the test bench, and the pressure gauge P is connected to the position where the distance between the connecting pipe of port A1 and port B1 is not more than 200mm from the hydraulic balance valve 1 And P 2 , The flow resistance of the hydraulic balance valve is: ΔP=P 1 -P 2.