Hydraulic valve | Controls direction, pressure & volume
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Modern hydraulic valves must offer the highest precision, efficiency and reliability in order to optimize the performance of hydraulic systems. Innovative technologies such as lower Switching times, optimized Flow Rates and intelligent control systems increases the innovative Hydraulic valve the system performance significantly. This article presents current innovations and highlights their diverse applications.
Content
- Plug-in check valve much better than screwed
- Hydraulic valve construction kit for mobile and stationary use
- Directional spool valve with actuation for CAN bus communication
- Universally applicable straight seat valve with diaphragm actuator
- Plunger valve is controlled by its own medium
Plug-in check valve much better than screwed
24.06.2024/XNUMX/XNUMX | Hydraulic check valves are central components in hydraulic systems and are among the most commonly used valve types. However, they still offer potential for optimization. Weber Hydraulics addresses quality risks associated with conventional screwed check valves and relies on plug-in alternatives to avoid these.
Hydraulic valve construction kit for mobile and stationary use
17.09.2020 | The modular hydraulic valve kit RPEK1-03/B from Argo Hytos was designed for mobile and stationary hydraulic applications. The kit is based on the disc directional valve RPEK1-03, nominal size 03. The directional valve has a maximum flow of 20 l/min per section.
The large number of vertical and horizontal sections allows in conjunction with Screw-in valves a creation of arbitrary schemes for open circuits. The modular design helps flexibly in the development of a new hydraulic system. The user is also supported when performing various system modifications to the hydraulic valves or when design changes are made frequently. The simplicity of the modification and extension options saves him development time and costs.
Hydraulic valve construction kit with four groups
The entire block consists of the following four subgroups:
Input block for connecting the control block
The inlet block connects the control block with the pressure and tank lines of the hydraulic valve system. There is the possibility of pressure reduction or unpressurized circulation by installing the 7 / 8-14 UNF (B2, C-10-2) valves. The input plate can be installed in the center of the assembly.
Module blocks with valves are connected on both sides. This allows a connection of up to 16 sections to be established. The modular inlet block can be used up to a total volume flow of 60 l / min and a working pressure of 250 bar. There are threads for connection to the circuit in the industrial standards BSPP and SAE.
Horizontal intermediate plates for screw-in valves
The horizontal intermediate plates with shaped bores for any screw-in valves of size ¾-16 UNF (A2, C-08-2) allow flexible execution of Control functions in consumer channels A and B. These lead to the connected consumers. The following hydraulic valves can be used:
- Check and pilot operated Check valves,
- Flow valves and current regulator
- Pressure valves
- Load holding valves to control the load movement all other solenoid operated valves for the direction control of the flow
Vertical mounting plates for connection to actuators
In the group of vertical mounting plates, Argo-Hytos offers pilot operated check valves, throttle valves with bypass check valves and variants of upper cover plates with vertical and horizontal outlets for connecting the actuators to individual sections.
End valve discs, basic disc directional valves, end plates
The end valve discs, basic disc directional valves and end plates mentioned at the beginning complete the modular RPEK1-03 hydraulic valve kit. The components of the hydraulic valve kit are suitable for applications such as hydraulic cylinders Functions in stationary and mobile systems or open center auxiliary functions in mobile and stationary machines.
Directional spool valve with actuation for CAN bus communication
05.05.2020 | The proportional spool valve series type PSL from Hawe Hydraulics has been expanded to include an onboard electronics option. The CAN Lite actuator offers an entry into CAN bus communication for many Mobile Machinery at. Manufacturers who have implemented quick commissioning through low cabling costs and preset parameters are addressed here.
By switching from the Valve control Through pulse width modulation (PWM) on CAN bus, the valves can be addressed precisely and functional parameters can be easily adjusted. The start and end positions of the directional spool valves are already preset in the delivery state for easy commissioning. The hysteresis during operation that is typical for directional spool valves is very low with the PSL-CAN Lite. The valve battery is connected to the bus system with just one connector. The wiring effort is minimal and commissioning is shorter.
The CAN-Lite actuation can be combined with the fully equipped CAN actuation version with feedback of the slide position from Hawe in a valve bank. Depending on the required precision and repeatability, the machine builder decides which type of actuation is best for each consumer.
The proportional directional spool valve PSL allows operating pressures of up to four sizes 420 bar and a volume flow of 1 to 1000 l / min. The different sizes can be combined in a valve bank. If only the size required for the respective individual function is used in the valve bank, the weight is reduced and the fine control is improved.
Universally applicable straight seat valve with diaphragm actuator
16.01.2015 | The universally applicable straight seat valve Vegetables 536 is robustly constructed and reliable in operation. The valve was developed with a long service life and low maintenance requirements in mind. The externally controlled 2/2-way valve has a diaphragm actuator that can be controlled with neutral gaseous media.
The valve seat is shut off by a valve disk that is movably arranged on the valve spindle. In addition to steel, PTFE and a glass fiber reinforced PTFE variant are available as seat seals.
The valve spindle is sealed by a self-adjusting gland packing. This ensures low-maintenance and reliable operation even after a long period of operation. Valve spindle seal The scraper ring also provides additional protection for the packing seal against contamination and damage.
As a material For the valve body, either stainless steel cast 1.4408 or ductile iron GGG40.3 can be used. A flange in accordance with EN 1092 or ANSI cl. 125/150 RF is available for the pipe connection.
Due to the arrangement as a straight seat valve, a good flow capacity and controllability is achieved. In the control valve version, standard control crowns are used. Due to the high quality design, Gemü 536 is also suitable for high operating temperatures and pressures. A version according to ATEX .
Plunger valve is controlled by its own medium
22.05.2014 | VAG brings the control and regulating valve type Riko onto the market, which has all the advantages of a needle valve with those of a self-controlled valve drive Until now, a needle valve could not be used in areas where no electricity or auxiliary energy was available. The automatic drive with integrated safety function, which is operated by the pipeline's own medium, can also be used for needle valves.
This is what connects the VAG Riko all the advantages of a needle valve such as functional reliability, control characteristics or cavitation behavior, with the advantages of a drive controlled by its own medium. Plunger valves are straight-through control fittings, with an annular flow cross-section in every position.
Inside the housing, the open piston is opened by a crankshaft moved axially towards the sealing seat of the valve in the direction of flow. The control valve creates different pressure losses in line systems through a continuous constriction towards the seat in order to change the flow rate depending on the travel.
Differential pressure overcomes flow forces
The main components of the drive form the Control circuit with its pilot valve and a proven drop weight drive. The energy required for opening comes from the existing pre-pressure, which is always greater than the back pressure when a system is in operation. This differential pressure across the valve is used to overcome the forces of the falling weight and the dynamic flow forces in the valve.
For the Closing movement the falling weight pushes the water on the piston side (internal medium) back into the medium flow of the pipeline via a piston. In addition, the drop weight forces are dimensioned in such a way that the plunger valve safely moves into the closed position in the event of a pressure equalization.
Externally controlled needle valve
Product animation for the needle valve as externally controlled control valve: For water with a ring cross-section, it is used for stepless control of high flow rates and pressure differences.
Source: This article is based on information from the following companies: Argo-Hytos, Gemü, Hawe Hydraulik, VAG, Weber-Hydraulik.
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