MTGreen
Platinum Member
- Joined
- Oct 12, 2022
- Messages
- 980
- Location
- Montana, USA
- Tractor
- Deere 5220, Ford 1720, Deere Progator 2030
Looks useful. Stability looks to be a concern
Running a Single Acting cylinder on a double acting valve.
- Thread starter Roger66
- Start date
- Views: 11507
Farmer495
Veteran Member
Double acting valve with float feature handles single acting cylinder easy, I have a wagon hoist, just put lever in float and it drops on it's own. I have used in on a double auto cancel valve and the only way to lower it with out deadheading/loading the used port was to just lightly hold the lever in "lower", locking it in caused loading.
CobyRupert
Super Member
Is running a single acting cylinder on a double acting valve really a concern?
My experience with single acting cylinders is limited and it’s been awhile, but I don’t remember paying any attention to the specifics of the SCV I plugged them into.
I’m thinking of a mower. Does pump dead-head and go into relief for a second or two when you lower it each time? And what are the harmful results?
My experience with single acting cylinders is limited and it’s been awhile, but I don’t remember paying any attention to the specifics of the SCV I plugged them into.
I’m thinking of a mower. Does pump dead-head and go into relief for a second or two when you lower it each time? And what are the harmful results?
Farmer495
Veteran Member
Not sure on how much real harm is done for a few seconds on relief, I did find that light touch on lever just allows the oil to flow "out" and not get pressurized the opposite other way.
MF243RedTop
Gold Member
Need to have the heaviest attachment you have on the 3pt hitch when operating with the lift on.
Great ingenuity!!
kennyd
Advertiser
Have you checked your reservoir when that thing is up that high? That cylinder has a lot of fluid in it!
Perhaps dead heading was the incorrect term. The valve is going into relief, but it's not for a second or 2, it's a minute or 2 to lower this. I don't think this is really harmful, it will heat the fluid, but I don't use this hard or often.
Stability is certainly a concern and I'm really careful and aware of that. The tractor however is longer, wider and probably just as heavy as the forklift it was previously. I use a ballast box filled with steel plates and lead. The Ballast box weighs somewhere over 2,000 lbs. The Forklift of course had solid tires and was intended for use on concrete floors in a warehouse. I still think this tractor setup is safer than how I was using my old forklift.
The reservoir volume is a real concern. I have no way to verify that. My dipstick only reads full or not. it's only about 1" in the fluid.
The real question is could I use the blocked flow from the valve to create a venturi effect like a jet pump to increase the downward speed of this by sucking the fluid out of the single acting cylinder. Something like the image below. Imagine the currently blocked flow is the air gun, the jar is the single acting cylinder and the spray is the return line to the tank.
Stability is certainly a concern and I'm really careful and aware of that. The tractor however is longer, wider and probably just as heavy as the forklift it was previously. I use a ballast box filled with steel plates and lead. The Ballast box weighs somewhere over 2,000 lbs. The Forklift of course had solid tires and was intended for use on concrete floors in a warehouse. I still think this tractor setup is safer than how I was using my old forklift.
The reservoir volume is a real concern. I have no way to verify that. My dipstick only reads full or not. it's only about 1" in the fluid.
The real question is could I use the blocked flow from the valve to create a venturi effect like a jet pump to increase the downward speed of this by sucking the fluid out of the single acting cylinder. Something like the image below. Imagine the currently blocked flow is the air gun, the jar is the single acting cylinder and the spray is the return line to the tank.
oldnslo
Super Member
A Venturi might help but will it aerate the oil to the point that you start cavitating the pump.
npalen
Elite Member
Is there an orifice hidden in the plumbing to the cylinder that is causing it to be slow on the downstroke?
MTGreen
Platinum Member
- Joined
- Oct 12, 2022
- Messages
- 980
- Location
- Montana, USA
- Tractor
- Deere 5220, Ford 1720, Deere Progator 2030
I don't know that that picture is illustrating the Venturi effect. The flowing air does create a vacuum in the copper tube; but my understanding is that to be called a Venturi effect the creation of a low pressure/suction must be accomplished by necking down or creating a restriction in a flowing fluid similar to how a carburetor pulls fuel in. I think the picture is more like the old crankcase vents which were just hoses run underneath the vehicle. The passing air at a right angle to the hose created a suction in the hose and the oil just dripped out onto the asphalt as the vehicle was going down the road.
