I. Introduction Since the pressure difference before and after the throttle valve varies with load, according to the flow formula (Q = CA △ Pm), the flow through the throttle valve is affected by the pressure difference ΔP before and after the valve. Therefore, Requirements of the high occasions, the general throttle can not meet the job requirements, so there has been speed control valve. Speed ​​control valve is set pressure differential valve and throttle valve in series made of composite valve. The function of the relief valve is to make the pressure difference before and after the throttle valve automatically keep constant (through feedback) when the load changes, to overcome the shortcomings that the pressure difference of the ordinary throttle valve fluctuates with the load, so as to improve the hydraulic system stability. Second, the failure mechanism (a) pressure compensation agencies (fixed valve) does not move, speed control valve as a general throttle (b) throttle flow control handle is very strenuous ①regulator handle stuck by dirt, or Adjust the handle thread is not good. ② for the throttle into the oil, speed control valve outlet pressure is too high. (C) throttling effect failure ①fixed valve valve stuck in the fully closed or small opening position. ② speed control valve inlet and outlet reversed. ③ governor valve inlet and outlet pressure difference is too small, resulting in flow adjustment failure. (D) flow instability ①fixed-pressure valve is not flexible move, can not play the role of pressure feedback; ② regulator valve and valve cover pressure feedback orifice obstruction, or due to differential pressure valve Core size of the head is not the same heart, with a bad reason; ③ governor valve internal and external leakage, resulting in flow instability; (E) internal and external leakage (VI) the minimum steady flow instability
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