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Double Checking Hyd.: Am I Correct?

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in-too-deep

10-10-2007 11:50:30

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Wanting to power a fertilizer spreader hydraulically. I want to make sure I have the order right.

Starting with the reservoir.
Reservoir to pump.
Pump to relief valve
From relief valve, a line back to reservoir.
From relief valve to ball valve to limit or stop flow to motor.
From ball valve to motor.
From motor to filter.
From filter back to reservoir.

The relief part is what I don't understand. I want to be able to shut the flow off while the pump is still turning. Is this the relief valve I need? I would have three lines hooked to that relief correct? One pressure from the pump, one returning to the res. for when I shut the flow off, and one continuing on to the motor? Thanks folks.

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buickanddeere

10-11-2007 10:06:42

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Re: Double Checking Hyd.: Am I Correct? in reply to in-too-deep, 10-10-2007 11:50:30

Open center or closed center. Stand alone system or powered off the tractors/trucks hydraulics? A screen on the pump inlet never hurt. If it's a stand alone system. May as well build something with enough pressure and Pioneer couplings. So that in a pinch your hydraulic powerpack could be used on a log splitter etc. The various jobber shops all sell ready built hydraulic power packs with warranty for less money than rounding up the parts & building one. Depending on the application. Electric drive can be an option.

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Gene Davis (Ga.)

10-10-2007 18:30:55

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Re: Double Checking Hyd.: Am I Correct? in reply to in-too-deep, 10-10-2007 11:50:30

Hey in too deep I have a complete hydrostatic drive set up that might do what you want if interested e-mail me direct Remove the X in the name before sending. Xgadavis@washemc.net

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J Schwiebert

10-10-2007 15:36:36

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Re: Double Checking Hyd.: Am I Correct? in reply to in-too-deep, 10-10-2007 11:50:30

You need a directional valve!. When you shut your ball valve off and all the pump flow will go over the relief at relief valve setting. This causes a major pressure drop and is a major cause of heat. Also did you do any calculation as to pump size, motor size and desired motor RPM. Remembe neither the pump nor the motor are 100% effecient> More questions?

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in-too-deep

10-10-2007 21:46:01

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Re: Double Checking Hyd.: Am I Correct? in reply to J Schwiebert, 10-10-2007 15:36:36

I haven't done the figuring on pump size and motor size yet. As far as motor RPM, I don't what I need yet, so that's why a speed control valve is important and I can gear it down or up, whichever the case may be.

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J Schwiebert

10-11-2007 18:09:51

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Re: Double Checking Hyd.: Am I Correct? in reply to in-too-deep, 10-10-2007 21:46:01

You want to match the speed of the motor with pump output as close as you can. Flow controls build heat when you throttle flow down so as to get the correct motor speed. Is your pump drive a variable speed device as in an internal combustion engine? Send me a phone number and a snail mail address I have a lot of that information laying around. J.

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soundguy

10-10-2007 12:27:44

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Re: Double Checking Hyd.: Am I Correct? in reply to in-too-deep, 10-10-2007 11:50:30

Ditto what Bob said.. if you don't get an open center spool valve with motor spool.. the hyd motor will abruptly stop.. also.. the ball valve idea is bad.. as when you close the valve.. the relief is in full action and will loa dthe engine down.. etc.

The open center spool will allow oil to the sump when the motor is not powered. might get a detent style as well..

soundguy

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Bob

10-10-2007 12:19:00

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Re: Double Checking Hyd.: Am I Correct? in reply to in-too-deep, 10-10-2007 11:50:30

You need something like a lever operated valve with a "motor spool". This could have the relief valve built in.

When the lever is moved away from center the motor will run. When the lever is centered, the "motor spool" feature will let the motor coast to a stop.

Third Party Image

Follow this with a "speed control valve".

Third Party Image

Actually, you could get by with the flow control valve, plus a relief valve, but the would be close in price to the other setup, anyway.

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in-too-deep

10-10-2007 12:37:00

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Re: Double Checking Hyd.: Am I Correct? in reply to Bob, 10-10-2007 12:19:00

How does a flow control valve differ for a plain old ball or gate valve? Does it have a bypass built in?

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Bob

10-10-2007 16:06:01

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Re: Double Checking Hyd.: Am I Correct? in reply to in-too-deep, 10-10-2007 12:37:00

It allows you to vary the speed of the motor, and bypasses the excess oil without it having to force it's way through the relief valve.

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in-too-deep

10-10-2007 21:49:06

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Re: Double Checking Hyd.: Am I Correct? in reply to Bob, 10-10-2007 16:06:01

So, if I get a speed control valve, I STILL need a relief valve even though the speed control already lets excess oil bypass? This all seems way more redundant (and expensive) than it needs to be, but then again, I've never built this kinda thing before.

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midwest redneck

10-10-2007 12:16:33

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Re: Double Checking Hyd.: Am I Correct? in reply to in-too-deep, 10-10-2007 11:50:30

You need to get a circuit diagram book. From the pump you will need to tee off of the main line and put in that relief valve, but you have to make sure that the valve is capable of the pump flow. You will also need a directional valve. and filtration.

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in-too-deep

10-10-2007 12:39:43

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Re: Double Checking Hyd.: Am I Correct? in reply to midwest redneck, 10-10-2007 12:16:33

Oh alright, tee it off, I didn't think of that. That relief would only have two ports, and that's all that's needed.

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