The selected several matters needing attention of hydraulic pneumatic control valve

all kinds of specifications of pneumatic valve, hydraulic control system can the maximum pressure and the actual flow through the pneumatic valve ( From Chad working diagram and the system is based on considering the control characteristics, stability and the pneumatic valve and oil mouth size, shape size, installation way and the way of manipulation, selected from the product samples or catalogue. Kanazawa form a complete set of hydraulic system of hydraulic production of various kinds of hydraulic pneumatic control valve selection considerations are as follows:
the actual flow, hydraulic pneumatic valve
the actual flow of hydraulic pneumatic valve associated with oil series, in parallel, series oil flow equal everywhere; At the same time working in parallel oil flow rate is equal to the sum of each oil flow. In addition, for the single piston rod of hydraulic cylinder system, pay attention to the piston overhang and inside shrink when the flow of oil return: when retracted rodless cavity oil return with overhanging the ratio of the rod chamber back to the flow of oil from time to tome, and two cavity equal the ratio of the area.
, hydraulic pneumatic valve pressure rating and the rated flow
the rated pressure of the pneumatic hydraulic control valve and the rated flow generally should be used instead of pressure and flow rate is close to. Higher requirements for reliability of system, the rated pressure of the pneumatic valve should be higher than the working pressure. If the rated pressure and rated flow is less than using the pressure and flow rate, is easy to cause the hydraulic clamping and hydraulic power and the pneumatic valve has a harmful effect on the quality of work; For system the order of the pneumatic valve and pressure relief valve, through the flow should not be far less than the rated flow, otherwise easy to produce vibration or other unstable phenomenon. For flow pneumatic valve, attention should be paid to its minimum flow stability.
, hydraulic pneumatic valve installation connection
the installation of the pneumatic valve connection way for the subsequent design of hydraulic device structure has a decisive impact, so choosing hydraulic pneumatic valve to hydraulic control device of integrated way to accomplish know fairly well. For example used plate connection hydraulic pneumatic valve, pneumatic valve can be installed on the oil or oil circuit boards, on the one hand, facilitate system integration and hydraulic equipment design reasonable, on the other hand, replacing hydraulic pneumatic valve does not need to remove the tubing, more convenient installation and maintenance; If using superposition pneumatic valve, superposition of the pneumatic valve need to be studied according to the pressure and flow series spectrum for selection, and so on.
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direction control pneumatic valve selection of for ordinary one-way pneumatic valve has simple structure, main attention should be paid to the reasonable choice of opening pressure: lower opening pressure, can in order to reduce the loss of fluid flow through one-way pneumatic valve resistance; But, for a back pressure pneumatic valve using one-way pneumatic valve, the opening pressure is higher, to ensure sufficient back pressure. For hydraulic control one-way pneumatic valve, in addition to the relevant matters needing attention in the reversing pneumatic valve, in order to avoid the abnormal vibration and noise of the system, should also pay attention to the reasonable choose the way of pressure release: when hydraulic control one-way pneumatic valve when there is a back pressure of export, appropriate chooses leaked type, other drainage type is optional.
for reversing pneumatic valve, should be paid attention to from the content system of automation and the requirement of operation cycle, from manual, mechanical, electromagnetic and electric hydraulic type reasonable choice of the control type. Slide pneumatic valve type reversing pneumatic valve is used in the right of the median function and grasp its quasi state transition function. For the hydraulic lock ( Double hydraulic control one-way pneumatic valve locking hydraulic actuator system, should choose 'H', 'Y' shaped the median function of the sliding reversing pneumatic valve, pneumatic valve type in order to make the reversing a pneumatic valve, the two hydraulic control one-way pneumatic valve control cavity are tank, ensure reliable hydraulic control one-way pneumatic valve reset and good lock state hydraulic actuators. Chooses the slide in the pneumatic valve type reversing pneumatic valve function in reversing the transition position, oil completely removing all should not happen, otherwise will lead to system instantaneous pressure infinity and lead to pipe blasting accidents, etc.