2 spool hydraulic control valve diagram

2 spool hydraulic control valve diagram

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Submit a question for this product Showing Questions of 17 In the description where it says "load check" does that mean a check valve to keep a cylinder from bleeding off when its under load? A: A load check is designed to force the system to overcome any load-generated pressure on a work port before opening.

This means that when the spool is shifted, if a load is acting on a cylinder the cylinder will not move because of the load's force until the system pressure is at least equal to or greater than the load's force.

Without load checks, a load can force a cylinder to move upon spool shift until the system 'catches' the load. With significant loads this can cause dangerous issues. I need this for a jd with loader closed system. If not what else do I need before purchasing? A: No, this valve comes set up for Open Center. They do come with the plug to convert the valve to Closed Center or Power Beyond.Hydraulic reversing valve is designed to manage and direct the flow of hydraulic oil between hydraulic pump and hydraulic cylinder, motor, oil tank, etc.

This is an economical hydraulic multi-way valve, which can be widely used in engineering machinery, agricultural machinery and other fields. Agricultural machine. Dump truck. Construction Vehicle. Special purpose vehicle. Drilling machine. Model: P Manual Control. Relief valve: Adjustable.

Hydraulic Monoblock Solenoid Directional Control Valve, 2 Spool, 21 GPM, 12V DC

Working oil port: SAE8. Inlet and outlet: SAE O function, spring reset. Gross Weight: 4. Package Includes:. If you are a U. Transport time will range from 2 to 4 workdays according to your location. These places will be charged extra postage. Please send a message to us before buying. Packaging should be the same as what is found in a retail store, unless the item was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag.

See the seller's listing for full details. Store category. Application: 1. Agricultural machine 2. Dump truck 3. Construction Vehicle 4.

Special purpose vehicle 5. Our company is an emerging professional Cross-Border Electronic company. So far we have finished the assets re-organization and obtained wholesale financing. We guarantee every product is of high quality and durable utility compared to other factories becayse we choose the best-buys goods.

Besides,our company has a powerful technical support and perfect after-sales service. We are really appreciated if you would like to give us your valuable positive comment s after you receive our products,which is a huge encouragement for us to make our products and service better and better. Hope you will love our items. Any questions will be answered promptly,so please feel free to let me know your concern.

We accept PayPal only. All major credit cards are accepted through secure payment processor PayPal.Hydraulic directional valve also called hydraulic spool valve, is the most popular valve in all sorts of hydraulic systems in industrial machine, the key part of spool plays main role while the valve in operation. Guess what, if you select an improper spool valve in your machine, it is sure that the machine either works like a naughty boy or refuse to work.

Hydraulic directional spool valve is a relative motion between the valve spool and valve housing, used for controlling fluid-flow direction of actuator motion movementselect alternative hydraulic oil control circuits, achieve logic control function. The hydraulic spool valves target is to reach different mechanical movement of actuator, like to release pressure, stop or redirect the pressure or flow in hydraulic systems.

The key part of hydraulic spool valve is spool, a spool valve function depends on the spool type, using different spool type in the middle of valve housing position will achieve different purpose in hydraulic system, therefore, appropriate function spool in middle position must be selected as per its feature during the design of hydraulic systems. Thanks Mr.

Harvey and Mr. Elliot for information about popular hydraulic spool valves in their market. E -Type Features: In the neutral positionall oil ports closed, not flow.

Functional characteristics: 1. It is stable operation from start to stop, because of full oil in return channel, which may have a dampening effect.

2 spool hydraulic control valve diagram

When the pressure starts pushing actuator to move, the speed is not too fast due to the influence of oil resistance, it is a big hydraulic shock caused by braking movement inertia.

The pressure can not be unloaded in pump chamber. High precision of spool switching position. H —Type Features: In the neutral position, all oil ports are open, no pressure. The inlet port P, return port T and work oil port ports A, B all connected, the hydraulic actuator is in a floating state, movement or rotary can be made if there an external force on it, therefore, the H spool type can be used in hand mechanism actuators.

The hydraulic pump can load the pressure. There is an impact from stop to start. The return oil flows to oil tank when the actuator stops working, there is no dampening effect of H spool type, the spool is more stable than E type when spool switching.

For single-pole double-acting cylinder, due to effective area on both sides of the piston is not equal, so the H type valve can not hold the cylinder piston in the stopped state. Because oil ports of A, B and T are connected, operation actuator is in the floating state, movement or rotary can be made if there is an external force on it, therefore, the J spool type can be used in hand mechanism actuator. There are some hydraulic impact from stop working to start, switching performance is between E spool type and H spool type.

Pump is unable to unload pressure. The working actuator allows to stop stably, due to A and B ports closed. Hydraulic pump can unload pressure. Not available for hand operation actuator. Smooth start and stop working process. Large hydraulic impact because of inertia when switching. The G spool type is used for pump unloading and cylinder locked in hydraulic oil circuit.

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The M type can be used in manual operation actuator, not available for single pole or diameter not equal to double pole and double-acting cylinder, where operation actuators will not be at static condition to compose differential hydraulic oil circuit. Relatively stable stop and start operation, smooth switching for hydraulic pressure in two chambers of cylinder. Hydraulic pump is unable to unload pressure. Little switching space position than H spool type, widely applications. Pump is able to unload pressure.

Different working characteristics while switching two directions. Before selecting hydraulic directional spool valvesit must be sure to choose appropriate spool valve in neutral position as per requirements of hydraulic system.

For example: 1. Design pressure unloading circuit by spool function in neutral position to achieve energy savings. When H, F and G spool type in neutral position of 4way, 3postion directional spool valve, the oil fluid from pump returns to oil reservoir directly to complete unloading hydraulic oil circuit, which allows pump to work under no load or a very small output power to achieve energy saving.In a hydraulic system force that is applied at one point is transmitted to another point using a pressurized hydraulic fluid.

They are used to pressurized the hydraulic fluid and force the fluid through the system. There are three types of hydraulic pump:. Fixed Displacement Pump — These pump has a set flow rate means every stroke of the motor moves same amount of fluid.

Fixed displacement pumps are perfect for single jobs that to be repeated indefinitely over long periods of time. Variable Displacement Pump — In Variable displacement pumps flow rate and outlet pressure can be changed as the pump operates. They are used to power a wider variety of tool, but require more expense and more attention.

2 spool hydraulic control valve diagram

Hydraulic cylinder is a mechanical hydraulic actuator that converts hydraulic energy or hydraulic pressure into linear displacement. It consists of cylindrical barrel, piston and piston rod. Pressure control valves limit the system pressure to protect the system components. There are four types of pressure control valve:. They are normally closed and it opens when the pressure exceeds a specified maximum value and diverts the pump flow back to reservoir or tank internally.

They are located near hydraulic pump. They are normally open and closed if the pressure exceed beyond specified design pressure at outlet. They are located near hydraulic actuator. They are designed to create backpressure at the return line of the actuator to prevent losing control over the load. A flow control valve is used for adjusting the flow rate of a fluid in a pipeline. The valve contains a flow passage or a port whose area can be varied. They are used in a hydraulic system that need to vary either flow or pressure to reduce lunge and shock.

They controls the returning flow in relation to the flow being directed into opposite side of the actuator.Production is shut down!

2 Spool 8 GPM Prince MB21BB5C1 DA Valve

Oil has leaked everywhere. Management is screaming to get the line going again. You hit the GO button and nothing moves. Everything is working except for one function. You race to the stock room and grab a replacement. It bolts up to the same place, works on the same voltage, plugs back in without any new wiring, and it seems everything is resolved.

But, when you power up the machine, one of the motions moves in when it is supposed to move out. A conveyor turns off when it is supposed to turn on. Downtime is extended. The machine is possibly damaged. Or worst case, at rest, a heavy device begins to change position when it is supposed to be held in place. What went wrong? A directional valve with the same size body — same size ports — same electrical connections — can do a variety of different functions and all you need to do is change the spool!

Externally, the valve will look exactly the same but internally the flow paths may be completely different. They all look the same but they are not!

Great care must be taken when grabbing a valve off the shelf! This valve below has a solenoid on one end and a spring on the opposite end. Shown here, the valve is in its non-energized position.

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The Spring is in control. Pressure comes in the P port if that is how the system is piped and out to B port. The A work port is flowing to the Tank or Return. When the Solenoid is energized, the valve shifts to opposite position see below. The Pressure now goes straight up to the A work Port. The B work port now goes to Tank.

2 spool hydraulic control valve diagram

The middle position can either be a third position or not utilized. If not utilized, the middle position becomes a transition. When utilized, the middle position can hold a device in position or release the pressure on a device. For that example, I chose one spool from the chart and filled in the blanks. Now look again and see some of the options on the initial chart.

Just on this chart, there are 13 spool options. Now we can start choosing operator options for each end of the spool.For full functionality of this site it is necessary to enable JavaScript.

2 spool hydraulic control valve diagram

Here are the instructions how to enable JavaScript in your web browser. It is necessary to use the proper valve according to application requirements. The Series B valve, if ordered with the power beyond option, can be converted from open center to closed center by installing a closed center plug in the power beyond port and setting the relief valve at least psi higher than system pressure or replacing the relief valve with "D" plug 1 R The CV version valve includes a conversion plug for changing from 4-way to 3-way operation.

Series B and C valves are available with adjustable relief valves - the "F" designation from to psi factory preset at psi "G" designation from to psi factory preset at psi. Pressure settings are made at 10 gpm and hence, pressures will be slightly higher at higher flow rates and slightly lower at lower flow rates. To reset, remove acorn nut, loosen lock nut, turn screw clockwise to increase pressure or counter-clockwise to reduce pressure. Series B and C valves are available with pressure released detents which are factory preset at psi and can be adjusted in the same manner as the system relief valves.

Hydraulic Basics - 02 - Directional Control valves -

Should be at least psi less than relief valve setting. Series B and C valves are limited to 3 positions and multiple spool valves to the up or down position.

When mounting, be sure there is adequate space to permit full handle movement.

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Valves may be mounted in any position. Mounting surfaces must be flat and care should be used when tightening mounting bolts. Over-tightening bolts on uneven surfaces can distort the valve body and cause spool binding and casting breakage.

There are only 3 potential spool valve problems: external leakage, excessive internal leakage, or spool bind. External leakage due to seal failure can be corrected by replacing seals. Leakage due to a cracked valve body requires complete valve replacement. Excessive internal leakage is usually caused by worn spools due to contaminates in the oil. Replace valve and system oil. Spool bind is caused by contamination, excessive heat, improper mounting or misalignment of valve linkage.

Correct problem as needed. Spool seals are easily replaced by removing the handle bracket, end cap and o-rings. Replace O-rings using standard seal kits, refer to appropriate parts list. Standard seal kits include o-rings for relief valve cartridges and conversion plugs if appropriate. CS solenoid version valves do not have spool seals; however, the solenoid cartridge seals can be easily replaced if needed.

Worn detents can be repaired by installing a replacement detent kit. Valve Selection and Application: It is necessary to use the proper valve according to application requirements.

Liquid Pipe Sealant Only Using an open center valve in a closed center system should use closed center valve. Using a closed center valve in an open center system should use open center valve. Using outlet port flow to second valve should use power beyond option - Series B. Using Series C valve in load lifting application should use Series B with load checks.I thought you might be interested in seeing it for yourself.

Please click on the following link to view the page:. This site is best viewed with Javascript enabled. Some features will not work without Javascript. For the best user experience please enable Javascript. Surplus 1 my account [sign in] contact us sign up for email view saved cart shopping cart shopping cart close. Loading your shopping cart Adding item to your shopping cart Removing item from your shopping cart There was an error updating your shopping cart!

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Submit a question for this product Showing Questions of 53 Would this work for wheel motors A: No this will not work for wheel motors. We require specs and performance descriptions to compare products.

A: We don't. I bled cylinders but no luck, i do have low psi while bleeding and excessive air, think spool valves are bypassing or I'm thinking i need a diverter valve to isolate 3 point and bucket valve and if i do do i just plug pb port? Thank you A: Please contact our product support staff at so we may better assist you. I have a kubota bhst. The loader is a bush hog qt. Would this work for my application.

Thank you. A: This valve appears to be compatible with the system type and flow, but that information should be checked with the manufacturer. Please contact our Product Support department with details regarding your tractor model so we may further assist you.


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