FDY320/50 type liquid control valve

Liquid control valve specific classification

Hydraulic control valve is a valve in the direction control. According to the direction control valve in hydraulic system function is divided intoone-way valve and valve two categories. A one-way valve withordinary one-way valve and check valve in the hydraulic transmission.

Liquid control valve application

(1)To keep the pressure on, slide valve has a valve leakagephenomenon, only a short time packing. When packing requirements,can be added to a liquid control one-way valve in the oil, the cone valve closed tight, make oil long time pressure.

(2)Supporting hydraulic cylinder "". In the vertical cylinder, since the slide valve and pipe leaks, the piston and piston rod of gravity, may causethe piston and piston rod down. The hydraulic control one-way valve is connected to the oil hydraulic cylinder, can prevent the hydraulic cylinder piston and slide activities such as part of the decline.

(3)Hydraulic cylinder locking. When the valve is in place, the two liquid control one-way valve is closed, can be tightly closed hydrauliccylinder two chamber oil, when the piston can not move because of external force generated.

(4)Large flow discharge of oil. Effective working area of hydraulic cylinder two chamber is great. When the piston back, the right cylinder chamber row oil suddenly increased, if the small flow of slide valve,throttling effect will have, restrict the speed of the piston back; if an additional liquid control one-way valve, the hydraulic cylinder piston back, the control pressure oil liquid control one-way valve is opened, it can be smoothly the right cavity fluid discharge.

(5)For oil filled valve. Vertical hydraulic cylinder piston at high speed down the process, because the role of high-pressure oil and weight,resulting in decreased rapidly, resulting in air and vacuum suction,must add up oil installations. Fluid control valve used as filling oil valve, oil supplement to complete.

(6) 　　Combined valve.

In the design of hydraulic circuit, sometimes can be a liquid control one-way valve combination valve to use. For example: with two liquidcontrol one-way valve and a check valve in parallel (one-way Fa Juzhong), equivalent to a three position three way reversing valvereversing loop. Needs to point out, the control pressure oil port does not work, should it pass back to the tank, otherwise the control pistonis difficult to reset, the one-way valve can not close the reverse flow.

Liquid control valve note

In practice, a hydraulic control one-way valve in the use of prone torepair process, the matters needing attention.　　

(1)Must ensure that the hydraulic control one-way valve controls the pressure enough, absolutely not allowed to control the pressure loss of pressure. Should pay attention to whether the control pressure to meet the requirements of the reverse turn. If the check valve controllead independent system, will have to analyze the change of the main system pressure control circuit pressure, so as to avoid themalfunction of hydraulic control valve.　　

(2)According to the check valve in the hydraulic system of the position or reverse oil cavity fluid flow resistance (pressure) size, structurereasonable selection of hydraulic control one-way valve (simple or compound) and drain means (within the vent or leak). For the drain type check valve, when the reverse oil outlet pressure exceeds a certain value, the hydraulic control section will lose control, so the vent type liquid control one-way valve is generally used to reverse the oil chamber without low pressure or back pressure of the occasion;the leakage type check valve can be used to reverse the oil cavitypressure the high places, to reduce the minimum control pressure, the power saving control. The system if the unloading type, piston cylinder will be sent down intermittent vibration and noise.