The results of the latest survey in hydraulic industry

Nowadays, in the field of cartridge valve technology, product development of the content can be far more than fine tuned so simple. "Fluid" magazine, through the questionnaire survey, according to the development direction of the future for major manufacturers of hydraulic industry views. In the past few years, your company in the cartridge valve areas whether it is worth mentioning the results of R & D? Do you think the cartridge valve must have the function of the future? This is the two issue of professional magazine "fluid" proposed leading to much home hydraulic industry enterprises.

In the past few years, Parker Hannifin Corporation has achieved significant results in a ISO7368 compliant plug-in valve research and development. According to the general manager of the company and a group of European industrial hydraulic applications engineering manager, doctor of Engineering Gerd Scheffel: "to control the discharge of the built-in valve module, it is a kind of low cost components. The closed unit which has only three faces: two surface is used for connecting the main flow, another surface is used to control the. Therefore, the closed unit position is always just according to the pressure ratio of main flow interface and control oil interface is determined, but not the "open valve" this file to adjust the position, so when the need to close the valve, it all depends on the strength of inserted spring. And the new design of the valve is used with four surface closed unit. In addition to the two surface is connected with the main flow, there are two independent control surface."

Specifically, this means that the bear two connecting mainstream amount of surface pressure is the same, therefore, the control surfaces can be designed very small. This design has a can adjust the position of the "open valve" gear, and therefore in the valve is closed, without causing delay, also do not need to rely on the strength of the spring. Because the control surface is very small, so it can reduce the energy consumption control required for operation. This structure is more suitable for fast loading proportional valve, proportional valve such as the use of die-casting machine, injection molding machine and other equipment.

Time for product research and development work, Dr. Scheffel explained: "there is a tendency of path specification is more and more big, because customers want their equipment to manufacture products parts more, not only can be used in the marine industry, can also be used for the oil and gas industry."

Similarly, in Erkelenz Sun Hydraulik also do well in the inserting technology field. Their new developed 4-Plus series valve. Bernd Z Dr. he explained: "we use CFD program to optimize the valve." Specifically, their development is a high flow rate, the threaded hole through the threaded valve optimization.

The most important characteristics including the product:

Based on the original characteristics of 4 series standard valve based

The highest flow rate up to 760L/min, and the pressure drop is less than 7bar

Application of pressure up to 350bar

After 4 series of thread hole optimization can meet the maximum velocity of 4-Plus series valve

The threaded hole new even in the 4 series of standards can improve the flow valve.

Like Z Dr he points out, the Sun company as the valve combination products specially designed customer can be composed of arbitrary configuration, can reduce the size of the hydraulic system, reduce the cost at the same time, the required number of components is less, and reduce the emergence of the possibility of leakage. Here are several examples of practical applications: packing machine, drilling machine, extrusion machine, forging machine, casting machine, wheel loader, dump truck, garbage extruding machine and many other devices.

For cartridge valve future must have what function problems, Bernd Z Dr. he replied: "more user requests access to relevant valves reliability of documents, such as the requirements for manufacturers to provide FMEA certificates and test results about the MTTED value, so as to prove the reliability of their machines and equipment. In addition, the low valve with gear monitoring function, the market demand is also on the rise. In a few cases, customers are also demanding the valve pressure to raise up to 350bar or more than 420bar."

Some more professional

HL Hydraulik Limited is a company specializing in the production of hydraulic and compressed air for the technology and equipment of stainless steel cartridge valve enterprises. Cartridge valve basically are equipped with soft sealing them, in order to prevent gas leakage. In addition to conform to the DIN standard, the path specifications from 16 to 100 cartridge valves ranging from outside, they also produce path specifications for the 10 and 125 to 250 special specifications of the cartridge valve.

For the specific HL hydraulic company innovation achievements made in the past few years, Heinz von der Mr. Ley explained: "in order to meet market expectations, we mainly research several special specifications of the products in the past few years: the cartridge valve for dirty media, for example the unfiltered containing waste shavings water; active cartridge valve, it can be to switch to control the piston, and the control pressure is lower; the cartridge valve support servo function, it can be to control the power of small, even when the stop time is longer, can also be inserted valve to effectively control the size (such as manual cut-off valve); and the use of special materials and with different coatings, for cartridge valve special medium; high pressure maximum 800bar cartridge valve; and for cartridge valve closing time is very short and the pulse technology."

For the future, Heinz von der Ley believes that, in the face of special purpose and the trend of a single production, the cartridge valve technology will become more specialized, some common specifications which can realize standardization and mass production, reducing cost of the products. The general manager added: "in this regard, we are most concerned about is still lower maintenance costs as much as possible, reduce downtime. For the standard cartridge valve, the pressure of cost is certainly growing, especially nowadays there are more and more foreign suppliers into the market."

Bucher Hydraulics the company's research and development is one of the focuses of cartridge valve and proportional throttle valve and flow control valve. Moreover, the cartridge valve technology also is not open around the key subject of energy efficiency. Therefore, the company's Lorenz Kallen that also need to take into account such as seat sealing or high flow pressure drop reducing delta P problem.

NG5/SAE08 seat Bucher company launched in the market recently sealed proportional throttle valve is realized a new member of production NG10 and NG16 throttle valve products in the family. Kallen said: "the pressure loss thread valve with this kind of powerful function in high volume is very small, and good sealing performance, function is very stable in the vibration of the system easily. Now, for the accurate control of movement in the high load condition, this is a very important standard."

MVRPSBA series proportional throttle valve is a kind of using the 3/4-16 UNF thread, with servo control function, the robust performance of screw valve, which is suitable for AL type screw (according to Bucher standard) and C0820 type screw (according to ANSI standard).

The valve can be according to the specific expectations of flow stepless regulation. When the flow is small, the high resolution display valve combination device and Bucher, pressure control, can accurately, in compensation of load conditions controlled mobile bigger weight. For example, the forklift can accurately unload heavy weights, and then aimed at the target, the weight lifted up. Because the seat sealing good, so when the weight is lifted, spent hours to keep the position don't understand.

The throttle valve can be used for the following purposes:

Lifting and moving material handling machinery

Agricultural machinery, such as heavy vehicles proportional platform scraper control device

All need to get rid of load application -- in combination with the Bucher company's Inline or bypass pressure control valve.

Multi function valve

However, the new NG5 valve seat sealing proportional flow control valve also let Lorenz Kallen proud. Due to the adoption of the new principle, Bucher company can be more functions are integrated in a valve. On the one hand, because the seat structure refining the tightness is good, it can block the main function and control function while maintaining the seat sealing, so that weight can be a long time to stay put. On the other hand, the function can make objects accurately, controllable and load independent down mobile integrated pressure control valve. To make various weights can move the economy reasonable and convenient, these unique functions can play a crucial role.

Bosch Rexroth (Bosch Rexroth) that the future development trend of Peter Dschida in the prediction of inserting technology: "like electronic and energy efficiency of such common topic is also reflected in the valve research and development work. In the process of electronic valves, will need to add more and more proportion function. Because the working hydraulic device of the original mobile working machine is mainly to control a hydraulic mechanical way, but now, they are increasingly being equipped with hydraulic device of electronic proportional servo control replaced. Another new trend is the integration function. A valve must be have more functions, such as pressure control, throttle and functional limitations of pressure and flow control. At this time, a new multifunctional integrated cartridge valve can often replace the original use of the traditional valve two. So it can save costs, save space."

Flow characteristics through the simulation and optimization of valve is also more energy efficient. By the new valve is skillfully connected to Rexroth HIC solutions (for compact customers control unit), can reduce the flow resistance and the loss to the lowest level.

In addition, the customer demand for performance data are increasingly high, such as pressure data. "Over the past ten years, 210bar has been the standard pressure, nowadays, the user's working pressure is generally in the 350bar to 500bar, miniaturization of components to unchanged in case of mechanical properties. Today, the new scheme of switch control device can realize large flow medium." Dschida stressed that.

In the past few years, Bosch Rexroth in concentrate on the development of new valves -- such as magnetic valve and proportional valve, to take into account the development trend. Among them, the core product mobile construction machinery electronic is proportional pressure reducing valve. Rexroth offers proportional pressure reducing valve of various specifications, and can be used to control electronic working hydraulic device solution.

In the process of research and development of the valve components, Bosch Rexroth with particular emphasis on the system of valve components in the optimized solution performance. "If the cartridge valve capable of using intelligent connection method for HIC solutions in terms of energy, then can produce extremely critical value-added effect." Dschida said.

Wandfluh company (Wandfluh) in the expanding of cartridge valve product scope, in order to adapt to the new requirements in the technology and the price of the market. Roger Waldburger this is to introduce new products details: "it is particularly worth mentioning is the use of proportional throttle valve design of the spiral valve seat sealing, it not only high, but also good compressive capability. The new valve set three functions, for example, need to have the device for lifting and lowering the weight function, this solution only one valve, you can directly use the joystick, precision and independently of the load control weight. In addition, because the valve of the flow is zero, so will not leak, so that the weights in a very long time stay at the specified location."

In addition to the solution of this kind of integration, Wan Fu Yue also launched a new pressure, flow and bypass function, nominal size of M42 proportional valve. In this way, can control and adjust the minute a maximum flow rate of 400L oil.

For the future trend of development, the cartridge valve technology Waldburger think, cartridge valve must be integrated with more functions in the future, that is to say that many functions in one. "In this way, the customer can not only reduce the part of the product design and the production cost, and can save installation space. Of course, this is a great challenge for cartridge valve development work, because only is more competitive than the old function, the integrated valve that may eventually be successful in the market."