 Hello everyone, I am SP Mankani, Assistant Professor, Department of Mechanical Engineering, Walchand Institute of Technology, Solaapur. Today we are going to study working of meter-out circuits. At the end of this lecture, students will be able to understand the working of meter-out circuits. So here, this is a meter-out circuit diagram. So here initially we are going to study the all parts in detail, then we will go for the actual working of this meter-out circuits. So here this one is a reservoir and the oil is through this filter, is going to be filtered. Then it comes to the pump. Pump is coupled with the motor. When the motor is in the operation condition, so that time this oil is going to be pumped in the upward direction. So here, whenever this oil is at a higher pressure than the defined pressure, so this is going to be indicating here as a pressure gauge. So whenever it crosses the defined or the preset pressure, so that time this comes in the action. So means this oil, whatever the oil is coming through this way. So this is the particular portion where it is coming in the action. So means here you are going to be understanding as whenever it crosses the defined or it is a set pressure, so that time it is going to be linked. So then the oil is going to be through this particularly it comes to the reservoir. So in the next diagram we are going to see the detail. So here, the simple diagram, this pressure whenever it crosses the designed or the defined pressure. So that time it comes through this way and it is going to be linked here. So this is also in the red color only because it is a higher pressure. So the oil is going to be through this particularly pipe it comes to the reservoir. So means it avoids the excess pressure. So whatever the oil is going to be flowing through this way, so it is avoiding the excess pressure. So here then whatever the pressure we are defined that pressure through that particularly pressure, the oil is coming through this particularly the control system. So this is you are going to be considering it as a four way two position manually operated spring loaded DC wall. So this particularly DC wall here it is a two part this is one and this is two. So here this is a two way position manually operated spring loaded DC wall. In the previous lecture you might have seen the details of this particular laser. Four way and three position. So here we are taken as a two positions. So the oil whatever it is coming high pressure oil it is going to be passing through this way. Then it comes to the this piston and cylinder arrangement. So here this piston and cylinder arrangement we are going to be considering here as a so this is as a inlet. This as a inlet means this we are going to be taken as a outlet. So means this is one position you are going to be taken as a inlet and another position is coming as a outlet. So this is related to the only piston and cylinder arrangements. So here this is the controlling the oil you are going to be using this particular wall. So then this is the flow control wall with the integral check wall. So here so then it comes to this once again back to the so this through this particularly part it comes to the reservoir. So these are the components of this particular laser circuit diagram. So now we are going with the detail working of this one. So here just the same diagram without any additional information you are taken this as a next diagram. So here if you observe the oil through this particularly filter so it comes to this one. So then it flowing through this because we are attached this particularly the wall is concerned. Two way wall in that we are taken this as a directly the flowing wall. So through this it comes to this one. So it is going to be acting the pressure on the piston head. It is going to act the pressure on the piston head. So when acting the pressure on the piston head it is going to moving it in the backward direction moving it in the backward direction. So that time the whatever the oil is available here whatever the oil is available here that will come through this particular way. So that will come through this particular way. So means here it is coming through this way. So then it comes to this one. So here what exactly the difference you are going to be observing as far as the metering and metering out circuit. In metering circuit whatever the inlet is going to be taken place here the controlling is going to be taken place here. So here at the outlet we are going to be taken as a controlling. This particular outlet whatever it is coming it is going to be controlling. So here majorly the students are going to get a confusion with the metering and metering out circuits. So in both the way whenever it is inlet it is becoming. So that time here it is the inlet and this is the outlet. So that time we are going to be controlling here. So this particularly two parts they are going to be getting as a metering or a metering out as a confusion. So to avoid that particular difficulties or a confusion is concerned I have taken metering as a separate and metering out as a separate. So now we are going with the particular as a metering out. Metering out is nothing but only you are going to control the oil which is coming out from the piston and cylinder arrangement. So means it is going to be coming out this oil is going to be controlled. This oil is going to be controlled here. So in the first this figure you are going to be getting this as a inlet. So it doesn't have any controlling system here directly it comes to this one. So then that oil is coming to this here it is a restricted because this is the wall is closed. So here there is no flow of the oil is concerned this is blocked. So when this is blocked the total oil has to come through this way and here there is a controlling arrangement. You have shown this as a arrow mark means it is going to be controlled. So whenever it is operated that controlled oil is coming through this way because of that you are going to be calling this as a metering out. Metering out is nothing but the outlet of the oil is going to be controlled. So that is metering out system. So here in the next figure so here you will the same controlling system in this diagram. Here we are applied as a only one side as a metering out that is the outlet you are going to be controlling. In the next figure we are going to be controlling this side as well as this side. So there the confusion part starts. So here just you can observe it once again the same components. This is the relief wall and this is the pump and here it is going to be high pressure oil is coming through this way and this is four by three four by three four ports and three controls. So that is the direction control all one two and three this is the normal position. So whatever the oil is coming here it is back drain back to the tank once again. And here we are going to be manually operated. This is going to be shifted in the first case we are going to be shifted this side and the second case we are going to be shifted to this side. So that operation you are going to be observing the next particular this animation animation diagram. So here just you can observe it here. So this is whenever the oil is going to be flowing this way just you can observe the while it's going to be flowing this way high pressure oil suppose so that oil whatever it is there it is going to flow in this direction. So here the flow is going to be taken place. Here there is no flow through this way here there is no flow through this way because it is off and this is going to be flowing through this way. Which means it is inlet is coming as if it is a there is no constraint in the inlet is concerned in the previous diagram. I have shown it as there is no constraint in that The same thing is shown here with the flow controller. So through this way the oil is going to be flowing this one and then it comes to this side. So because inlet we are not controlled, inlet is given directly and whenever it is going to be pushing it is backside so this oil is coming out. This is going to be restricted now, this is important for meter out circuit. This is important now. This oil is coming outside like this. So whenever it is coming here it is restricted. So it is not permitted to flow through this way. So this is closed and the oil has to flow this way only. Here it is a controlled. So means meter out, outside you are going to be controlling whatever the outside it is coming that is going to be controlled. So then it come back then it will come to the this reservoir. The same thing it is going to be applied as a reverse if it is going to be applied as a reverse. So if you take it this one as a 1, 2 and this is 3. 2 is normal, 1 is a straight and another is a cross. So if you applied this one so that time that oil is going to be flowing through this way. Oil is going to be flowing through this way. So here just you can observe. So while it is flowing through this way so this is going to be in the operation. This is going to be opened. So that time this is going to be closed. So just I will go with the black color line now just to differentiate it. This is closed now while it is moving in this direction. So that oil comes through this way and then it is going to be flowing through this way and inlet there is no distinction, inlet there is no distinction. So here, this is closed and inlet there is no distinction. So it is coming as a inlet and whatever the load is coming this side now. Load is coming this side now because it is going to be coming in this way means moving in this direction. Retardation is going to be taken place this is expansion to retardation. So while it is moving in this way, so this is now it is moving in this way, so that time so it is going to be pressure is created here and that oil is coming here. So when this oil is coming here this is restricted, this is restricted that time, black color I am showing it, this is restricted. So now this is opened, so means outlet of oil once again it is going to be controlled means it is called as a metroid circuits, okay you observed as a metroid circuits as well as controlling this side as well as controlling this side. Whenever there is a both the figures are coming in the single figure both this particular last coming in the single figure that time usually used to get a confusion. So to avoid that one just to remember as outlet is going to be controlled that is metroid inlet is going to be controlled that is metering in the previous lecture here just you can observe the working whatever oil is going to be flowing through this way and it will come this way the same thing is going to be happening when it is going to be a normal flow this is coming this way and it is going to be flowing through this way this is closed and this is acting now it will come to this inlet and outside this yellow color whatever representing this is not going to be flowing this one this is closed. So that time this is in the working condition the same thing is going to be repeated for once again just for understanding purpose now we can observe here this is the flow is going to be taken place through this way this is we are going to be calling it as a meter out circuits I hope you are observing this in clearly this flow red color is a high pressure and it will come and outside yellow color we are going to be restricted by flowing through this way this is close that time so now there is a small water applications of meter out circuits so here meter out circuit is ideal for overloading load applications in which workload tends to pull and operating piston faster than the pumps delivery would warrant so here examples would be for drilling rimming boring turning and threading tapping cutting off and cold swing machines a skull cold saving machines sorry so these are the application parts of this meter out circuits so here for the further detail you can refer this particular site as well as oil hydraulics systems by SR Mujumdar thank you