Parker Hydraulic Proportional Valve TEA040EW09B2NXWJ Spot Direct Procurement

Parker Hydraulic Proportional Valve TEA040EW09B2NXWJ Spot Direct Procurement

Do you currently have the American brand PARKER on hand and need to inquire about pricing? Send it to Bibi! Suitable for us to make a deal, not suitable, there will be opportunities in the future. The deal cannot be made, but emotions remain. I hope you can think of me when you need it.

The PARKER proportional valve TEA series quick response electro-hydraulic proportional throttle valve unit has a flow rate of 9500l/min and is suitable for injection molding and die-casting machine application environments. The directional valve integrated in its guiding circuit provides safety functions.

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The main valve and directional valve of Parker proportional valve are both slide valve structures, except that the direction of the valve core is not driven by an electromagnet, but by the hydraulic pressure output from the front stage valve, similar to an electro-hydraulic directional valve. Generally speaking, servo systems seem to be closed-loop control, with proportional control being more commonly used for open-loop control.

Secondly, there are many types of proportional valves, such as proportional pressure and flow control valves, which are more flexible in control than servos. From their internal structure, servo valves mostly have zero coverage, while proportional valves have a certain dead zone, resulting in low control accuracy and slow response.

(1) It can achieve infinite adjustment of pressure and speed, avoiding the impact phenomenon of common switch type air valve reversing.

(2) It can achieve remote control and program control.

(3) Compared with intermittent control, the system is simplified and the components are greatly reduced.

(4) Compared with hydraulic proportional valves, they have smaller volume, lighter weight, simpler structure, and lower cost, but their response speed is much slower than hydraulic systems and they are sensitive to load changes.

(5) Low power consumption, minimal heat generation, and low noise.

PARKER proportional valveFeatures:

The proportional valve consists of two parts: a DC proportional solenoid and a hydraulic valve. The core of continuous control of the proportional valve is the use of proportional solenoid. There are many types of proportional solenoid, but their working principles are basically the same. They are all developed according to the control needs of the proportional valve.

With the development of hydraulic transmission and hydraulic servo systems, some hydraulic systems that require continuous control of pressure, flow, and direction without requiring high control accuracy have emerged in production practice. Due to the fact that ordinary hydraulic components cannot meet certain servo requirements, and the use of electro-hydraulic servo valves is too wasteful due to low control accuracy requirements, proportional control valves that fall between ordinary hydraulic components (switch control) and servo valves (continuous control) have emerged in recent years.

Working principle of PARKER proportional valve：

When not braking, the piston is in the left end limit position under the action of the thrust F applied by the sensing spring through the lever. At this time, the valve leaves the valve seat and opens, allowing the input and output oil circuits to communicate. When starting to brake, the brake fluid with pressure P1 from the booster enters through the inlet and is delivered to the rear brake pipeline through the valve from the outlet At this time, the output hydraulic pressure P is equal to the input hydraulic pressure P1. When the brake pedal force increases, P1 and P2 increase synchronously. However, due to the larger pressure bearing area on the left side of the piston compared to the right side, the force exerted on the left side of the piston is also greater than that on the right side

The working principle of the American PARKER proportional valve is to replace the original control part with a proportional solenoid on ordinary pressure valves, flow valves, and directional valves. It continuously and proportionally controls the pressure, flow rate, or direction of the oil flow remotely according to the input electrical signal. Proportional valves generally have pressure compensation performance, and the output pressure and flow rate can be unaffected by load changes.

The working principle of PARKER proportional valve in the United States

By amplifying the signal through a proportional amplifier and proportionally outputting current to the proportional solenoid of the proportional valve, the proportional solenoid outputs force and proportionally moves the position of the valve core to control the flow rate and change the direction of the flow, thereby achieving position or speed control of the actuator. In some applications that require high precision in position or velocity, a closed-loop control system can also be formed by detecting the displacement or velocity of the actuator.

The common faults of PARKER proportional valve are that the proportional valve does not operate, and should be investigated from the following aspects:

(1) If the wire end of the imported proportional valve is loose or falls off, the solenoid valve cannot be powered, and the wire end can be tightened.

(2) The imported proportional valve coil is burnt out. The wiring of the solenoid valve can be removed and measured with a multimeter. If there is an open circuit, the solenoid valve coil is burnt out.

The reason is that the coil is damp, causing poor insulation and magnetic leakage, resulting in excessive current inside the coil and burning out. Therefore, it is necessary to prevent rainwater from entering the solenoid valve. In addition, if the spring is too hard, the reaction force is too large, the number of turns in the coil is too small, and the suction force is not enough, it can also cause the coil to burn out. When dealing with emergencies, the manual button on the coil can be moved from the "0" position during normal operation to the "1" position to open the valve.

(3) The proportional valve is stuck. The clearance between the slide valve sleeve and the valve core of the proportional valve is very small (less than 0.008mm), usually assembled as a single piece. When mechanical impurities are introduced or there is too little lubricating oil, it is easy to get stuck.

The processing method can be to insert a steel wire through the small hole in the head and make it bounce back. The fundamental solution is to remove the solenoid valve, take out the valve core and core sleeve, clean them with CCI4, and make the valve core move flexibly inside the valve sleeve. When disassembling, attention should be paid to the assembly sequence and external wiring position of each component, in order to reassemble and wire correctly. It is also necessary to check whether the oil mist spray hole is blocked and whether the lubricating oil is sufficient.

(4) Leakage. Leakage can cause insufficient air pressure, making it difficult to open and close the forced valve. The reason is that the sealing gasket is damaged or the slide valve is worn, causing several cavities to blow air.

When dealing with electromagnetic valve faults in the switching system, an appropriate timing should be chosen to handle them when the solenoid valve is in a power-off state. If the problem cannot be resolved within a switching gap, the switching system can be paused and handled calmly.

Parker Hydraulic Proportional Valve TEA040EW09B2NXWJ Spot Direct Procurement