PARKER proportional valve D1VW001CNJW91 in stock
$291.24
The main valve of the American PARKER proportional valve is generally a spool valve structure, just like the directional valve. However, the valve core is not driven by an electromagnet, but by the hydraulic pressure output by the pre-stage valve. This is similar to the electro-hydraulic directional valve, except that the pre-stage valve of the electro-hydraulic directional valve is an electromagnetic directional valve, while the pre-stage valve of the servo valve is a nozzle-baffle valve or jet valve with better dynamic characteristics.
Brand
PARKER/American Parker
PARKER proportional valve automatic control can be divided into intermittent control and continuous control. Intermittent control is on/off control. Pneumatic control systems use on/off directional valves with low operating frequencies to control the airflow. Pressure reducing valves regulate the required pressure, and throttle valves regulate the required flow rate. This traditional pneumatic control system requires multiple pressure reducing valves, throttle valves, and directional valves to achieve multiple output forces and multiple movement speeds. This not only requires more components, increases cost, and complicates the system, but also requires many components to be manually adjusted in advance. Electro-proportional valve control is a continuous control, characterized by the output changing with the input, and there is a certain proportional relationship between the output and input. Proportional control is divided into open-loop control and closed-loop control.
The main differences between PARKER proportional valves and servo valves are as follows:
1. Different drive devices. The drive device for proportional valves is a proportional electromagnet; the drive device for servo valves is a force motor or torque motor;
2. Different performance parameters. 2.1 Servo valves have no dead zone in the neutral position, while proportional valves do. Therefore, their applications differ. Servo valves and servo proportional valves are mainly used in closed-loop control systems, while other proportional valve structures are mainly used in open-loop control systems and closed-loop speed control systems.
2.2 Servo valves have a higher frequency response (response frequency), reaching up to around 200Hz, while proportional valves generally have a maximum frequency of tens of Hz.
2.3 Servo valves have higher requirements for hydraulic fluid, requiring filtration to prevent clogging, while proportional valves have lower requirements.
3. Valve core structure and machining precision differ. Proportional valves use a valve core + valve body structure, with the valve body also serving as the valve sleeve. Servo valves and servo proportional valves use a valve core + valve sleeve structure.
4. Neutral position functions differ. Proportional directional valves have neutral position functions similar to ordinary directional valves, while servo valves only have an O-type neutral position function (E-type for Rexroth products).
5. Rated pressure drop differs.
Proportional servo valves offer performance between servo valves and proportional valves.
Proportional directional valves are a type of proportional valve used to control flow rate and direction.
Features of PARKER Proportional Valves
1) Enables stepless adjustment of pressure and speed, avoiding the shock phenomenon that occurs when switching normally open on/off pneumatic valves.
2) Enables remote and program control.
3) Simplifies the system and significantly reduces the number of components compared to intermittent control.
4) Compared to hydraulic proportional valves, it is smaller, lighter, simpler in structure, and lower in cost, but its response speed is much slower and it is more sensitive to load changes.
5) Low power consumption, low heat generation, and low noise.
6) Does not cause fires and does not pollute the environment. Less affected by temperature changes.
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FM3DDKV"PARKER The company primarily deals in European and American brands, and can source brands from any European country. For example, its key German brands include: BURKERT, DEMAG, HAWE, REXROTH, HYDAC, PILZ relays, FESTO, IFM sensors, E+H, HEIDENHAIN, P+F sensors, SICK, TURCK, HIRSCHMANN industrial switches, Henschler, MURR, SCHMERSAL, SAMSON, and EPRO (a subsidiary of Emerson). Other brands include: MOOG (USA), ASCO (USA), MAC (USA), NUMATICS (USA), PARKER (USA), VICKERS (USA), and Helon Norgren (UK). Italian brands OMAL, ATOS, CAMOZZI, UNIVER, and Camozzi.
