directional control valve hydraulic

Basics Of Directional Control Valves & Functionality

Largely, the essential component of any fluid power system is the Directional Control Valves. Directional control valves, also known as DCV, have one of the most significant parts to play in any hydraulic and pneumatic network. 

The directional control valves approve of every fluid flow (from hydraulic oil, water to air) into many directions from one or other sources. DCV will generally include a spool inside a cylinder which is mechanically or electrically placed. The role of this spool is to prohibit or authorize flow and additionally regulate the fluid cycle.

Type of DCVs (Directional Control Valves)

The directional control valves have various types, through which they fulfill the fluid flow of hydraulic oil, water, or air. Each of them works great in their respective fields. And they are widely used in several industries. Listed below are the other types classified based on the fluid path:

  1. Check Valve
  2. Shuttle Valve
  3. Spool Valve
  • Two-way Valve
  • Threeway Valve
  • Four-Way Valve

 

  1. Check Valves: This type of directional control valve yuken authorizes fluid progression only in an individual direction. For fluids to stream through the basin, slight pressure is compelled to open the valve seat in a solo direction. The valve cleans when there is a flow through the basin. The diagram for this one is a ball-type check valve.Whenever the flow begins to run opposite to this direction the valve shuts down. The oppression in the opposite direction lifts the ball against the valve seat, locking the path.

  2. Shuttle valve: Shuttle valves allow the flow in two different directions. When the coercion of the flow on one side expands the valve closes off the other path. Shuttle valves are mainly utilized where there are two pumps that are utilized in a manner if one flunks to conserve the outlet pressure the other pump delivers the flow as a backup.
  3. Spool type valve

 

Spool-type valves can be transferred to two, three, or more routing fluid regions between the several inlet and outlet ports varieties. These are commonly procured for guiding control of actuators because a single valve can only produce breadth, retraction, and neutrality.  There are three other variants of the spool-type valve, which include two-way, three-way, and Four-way valves:

 

  • Two-way Valves

 

Two-way valves are one of those spool valves with simple two positions ON/OFF valves. But it is actuated by actuators, as in solenoid actuators, hydraulic actuators, etc. There are plugged and normally opened two-way valves, outer actuation is compelled to do the role change of the valve actuator. A flow orbit is confirmed or shut down when the actuator is changed. These valves are similarly called on-off valves.

 

  • Three-way valves

 

Three-way directional control valve yuken has three offshoots and enables two positions of actuation in ON condition. A three-way valve primarily has two plug actuators, each plug legislates the flow in two unique ways. When one of the plugs closes off a node, the other one cleans the other node. This closed valve equalizes the obligation of the actuator closing both the nodes to protect the valve. Three-way directional valves are available for the directory, mechanical, pilot, solenoid actuation.

 

  • Four-way Valve

 

The four-way valve or three-position valves got three working positions for the actuators to legislate the flow direction. This directional control valve is utilized to regulate cylinders and fluid motors in both ways hydraulically. These valves are applicable to the goal of actuation, manual, computerized, solenoid, pilot, and pneumatic. A four-way valve will be handed over with two or three directions. You should know the valve suggests only one tank port even though sometimes there are two as it is only doubtful with the function.

Important Things To Contemplate While Buying The Directional Control Valves? 

The hydraulic directional control valves control fluids only, there are still several facets that you have to evaluate while buying the right valve. Starting from:

  • Dynamic Power Limits
  • Static Power Limits
  • Resistance To Flow
  • Switching Time
  • Leakage

These are the fundamental aspects that have to be taken into attention to make sure that you can buy a product that is adequate for your emergencies. For easy usage out of the directional control valve, make sure your valve includes all of the above facets. All these points are substantial factors that can make or break the functionality of a valve. If you genuinely want to protect the absolute level of sustainability and efficiency of the valve, it is crucial to get these facts examined. 

Here are some important questions that we think are important to understand about hydraulic directional control valves and their suitable use on a daily basis. For a clear comprehension, do read it carefully. We hope you’ll find them very helpful. Hence, look at the questions & quick answers in the next column.

Few Commonly Asked Questions on DCV:

The two main aspects that you need to keep in the head for selecting a directional-control valve are the number of fluid ports it has and the amount of the directional states, or stances that the valve can achieve.
The purpose of the directional control valve Rexroth is that it has the proficiency to either restrict or enact the flow of the fluid that ascertains pressure. Depending on the categories of the directional control valves, the functionality will differ, however, the purpose is connected, which exerts the exertion of pressure.
The check valves are utilized to ratify the free flow of packed air in only one direction and it prevents the flow of condensed air in the opposite direction. Since cheblockves block the reverse flow, they are also recognized as Non-return valves.
An immediate exhaust valve is a traditional shuttle valve. The objective of a primary exhaust valve is to tire out the cylinder air to the atmosphere quickly. It is used with a spring retrieval single working cylinder to enhance the piston velocity of the cylinders.
There are a lot of types of directional control valve Rexroth, but to select the right one for regulating the flow. Look at the aspects below: Pneumatically-actuated globe valves Diaphragm valves Quarter-turn types such as the modified edition of ball and butterfly valves Gate valves Needle valves
The main purpose of the valves positioner is to serve for a: Alter the fail-safe status of the valve Enhance the precision of the valve Alter the definition of the valve Improve transmitter accuracy Abolish cavitation in the valve

Conclusion 

There are the basics of the directional control valves. The importance of DCV fabricates in its processes. It enables the progression of the fluid in the piston to protect the balance. Without its existence, there will not be an equilibrium in transmitting the pressure so that the user can utilize it to its ultimate capacity. DCV restrains the flow of the fluid in the piston to fabricate the ingenuity of pressure in the hydraulic cylinder to make the functionality more efficient and smooth.

Everything About Directional Control Valves & Its Work

The most basic components of any fluid power system, Directional Control Valves. Today, we are going to discuss what purpose DCV serves, classification, and other things.

Directional control valves (DCVs) have one of the most important parts to play in hydraulic and pneumatic systems. DCV authorizes fluid flow (hydraulic oil, water, or air) into several paths from one or further sources. DCV will commonly contain a spool inside a cylinder which is mechanically or electrically positioned. The position of the spool prohibits or sometimes allows flow, and further controls the fluid flow.

Classification of DCV (Directional Control Valves)

DCVs are not stuck in a single type. These valves have several other types, through which they serve the fluid flow of hydraulic oil, water, or air. Let’ see what other types it has to offer based on the fluid path:

  • Check Valve
  • Shuttle Valve
  • Spool Valve
  • Two-way Valve
  • Threeway Valve
  • Four-Way Valve

Check Valves

This type of Directional Control Valves permits fluid flow only in a single direction. For fluids to flow through the inlet, a tiny pressure is required to unlock the valve seat in a single direction. The valve clears when there is a flow through the inlet/basin. The figure for this one is a ball-type check valve.

Whenever the flow starts to run opposite to this direction the valve shuts. The coercion in the opposite direction thrusts the ball against the valve seat, hence closing the path.

Shuttle valve

The second is the shuttle valve, this allows the flow in two varied directions. When the pressure of the flow on one side improves the valve shuts the other corridor. The closing and opening ailment for both directions is exemplified in the above figure.

Shuttle valves are generally utilized where there are two pumps that are used in a means if one flunks to maintain the outlet pressure the other pump provides the flow as a backup.

Spool type valve

Spool-type valves are naturally used as they can be transported to two, three, or more routing fluid areas between the various inlet and outlet ports assortments. These are generally obtained for navigating control of actuators because an individual valve can only generate breadth, retraction, and neutrality. 

Now, there are three other variants of the spool-type valve, which include two-way, three-way, and Four-way valves:

Two-way Valves

Two-way valves are one of those spool valves with easy two positions ON/OFF valves. But it is actuated by actuators as in solenoid actuators, hydraulic actuators, etc.

There are generally sealed and normally opened two-way valves, outer actuation is required to do the role change of the valve actuator. A flow route is ascertained or shut down when the actuator is shifted. These valves are similarly called on-off valves.

Three-way valves

Three-way valves have three nodes and allow two positions of actuation in ON condition. A three-way valve mainly has two plug actuators, each plug regulates the flow in two unique ways. When one of the plugs shuts a node, the other one clears the other node.

This naturally closed valve counteracts the responsibility of the actuator closing both the nodes to secure the valve. Three-way directional valves are accessible for the directory, mechanical, pilot, solenoid actuation.

Four-way Valve

The last category of DCVs. The four-way valve or three-position valves which got three functioning positions for the actuators to regulate the flow direction.

 

This yuken directional control valve is normally utilized to govern cylinders and fluid motors in both ways hydraulically. These valves are accessible with the intention of actuation, manual, computerized, solenoid, pilot, and pneumatic. A four-way valve will be handed over with two or three directions. One should know the valve indicates only one tank port even though sometimes there maybe two as it is only uptight with the function.

Three-position, four-way DCV have various assortments of middle configurations. The civil varieties are the open center, closed center, floating center, and regenerative center with open & locked.

Common Things To Consider While Buying The Directional Control Valves? 

As you already know that Directional Control Valve hydraulic fluids only, there are still various facets that you have to consider while buying the right valve.

  • Dynamic Power Limits
  • Static Power Limits
  • Resistance To Flow
  • Switching Time
  • Leakage

These are the main things that have to be taken into contemplation to make sure that you can get a product that is sufficient for your necessities. If any of the above fails to maintain or checks for each of the points mentioned above, then it will be a problem. For easy usage out of the yuken directional control valve, make sure your valve contains all of the above aspects. All these points are significant characteristics that can make or break the functionality of the valve. If you truly want to maintain the absolute level of sustainability and efficiency of the valve, it is essential to get these facts tested. 

Here are a few important questions that are often asked by people to understand what kind of Directional Control Valve hydraulic are appropriate to use on a daily basis. Look at the questions & brief answers in the upcoming section.

Few Commonly Asked Questions on DCV:

The two main facets that you require to keep in mind for electing a directional-control valve are the number of fluid ports it has and the amount of the directional states, or positions that the valve can attain.
The goal of the Rexroth directional valve is that it has the ability to either restrict or authorize the flow of the fluid that establishes pressure. Relying on the classifications of the directional control valve utilized, the functionality will change nonetheless the purpose is similar, which wields the exertion of pressure.
The check valves are utilized to authorize the free flow of packed air in only one direction and it precludes the flow of condensed air on the contrary direction. Since cheblockves block the lapse flow, they are also recognized as Non-return valves.
A rapid exhaust valve is a conventional shuttle valve. The purpose of a sudden exhaust valve is to exhaust the cylinder air to the atmosphere promptly. It is utilized with a spring retrieval single acting cylinder to improve the piston velocity of the cylinders.
There are plenty of types of Rexroth directional control valve, but to choose the right one for controlling the flow. Look at the aspects below: Pneumatically-actuated globe valves Diaphragm valves Quarter-turn types such as the modified edition of ball and butterfly valves Gate valves Needle valves

Conclusion: 

This is everything you need to know about Directional Control Valves. The significance of DCV lies in its processes. It facilitates the flow of the fluid in the piston to protect the balance. Without its presence, there will not be a balance in disseminating the pressure so that the user can utilize it to its ultimate potential. DCV regulates the flow of the fluid in the piston to falsify the invention of pressure in the hydraulic cylinder to make the functionality more productive and steady.