Seven precautions for hydraulic control valve purchase
hydraulic control system orHydraulic transmission systemIn , the components that control the pressure, direction and flow of the liquid are what we refer to as hydraulic control valves. The specifications and models of various hydraulic control valves can be based on the higher pressure of the system and the actual flow through the valve, taking into account the valve’s control characteristics, stability, oil port size, external dimensions, installation and connection methods, operation methods, etc., from the product Select from samples or catalogues. The following will share with you the precautions related to the selection of hydraulic control valves:
1. Actual flow of hydraulic valve
The actual flow of the hydraulic valve is related to the series and parallel connection of the oil circuit: the flow of the series oil circuit is equal; the flow of the parallel oil circuit working at the same time is equal to the sum of the flow of each oil circuit. In addition, for a system using a single-piston rod hydraulic cylinder, pay attention to the difference in the oil return flow rate when the piston is extended and retracted: the ratio of the oil return flow rate of the rod chamber without rod chamber during retraction and the return oil flow rate of the rod chamber when extended, and the The ratio of the areas of the two chambers is equal.
2. Rated pressure and rated flow of hydraulic valve
The rated pressure and rated flow of each hydraulic control valve should generally be close to its operating pressure and flow. For systems with higher reliability requirements, the rated pressure of the valve should be much higher than its operating pressure. If the rated pressure and rated flow are less than the operating pressure and flow, it is easy to cause hydraulic clamping and hydraulic power and adversely affect the working quality of the valve; for the sequence valve and pressure reducing valve in the system, the flow rate should not be much smaller than the rated flow. flow, otherwise it is easy to produce vibration or other unstable phenomena. For the flow valve, attention should be paid to its small steady flow.
3. Installation and connection method of hydraulic valve
Since the installation and connection method of the valve has a decisive influence on the structural type of the hydraulic device designed later, when selecting a hydraulic valve, the integration method of the hydraulic control device should be well known. For example, the use of plate-type connection hydraulic valve, because the valve can be installed on the oil circuit board or oil circuit block, on the one hand, it is convenient for system integration and rationalization of hydraulic device design; If a stack valve is used, it is necessary to study the series type spectrum of the stack valve according to the pressure and flow for selection, and so on.
4. Selection of directional control valve
For ordinary one-way valves with simple structure, attention should be paid to the reasonable selection of their opening pressure: a lower opening pressure can reduce the resistance loss of liquid flow through the one-way valve; however, for the one-way valve used as a back pressure valve , its opening pressure is high to ensure sufficient back pressure. For the hydraulic control check valve, in addition to the relevant precautions in this reversing valve, in order to avoid abnormal vibration and noise of the system, attention should also be paid to the reasonable selection of its pressure relief method: when the outlet of the hydraulic control check valve has a backlash In case of pressure, the external leakage type should be used, and the internal leakage type can be selected in other cases.
The above four points related to the selection of hydraulic control valves include:Actual flow of hydraulic valve,Rated pressure and rated flow of hydraulic valve,How to install hydraulic valveas well asSelection of directional control valveFamiliar with the precautions in these four aspects, you can definitely choose a suitable hydraulic control valve.