Is there a high pressure pump with small flow rate?

When the pressure reaches 40Bar, it is best to use a hydraulic diaphragm metering pump. There are many such pumps, such as Milton Royle and Pulsafeedar, which can easily handle it.

All kinds of metering pumps used in laboratories basically meet the requirements, and there are many manufacturers. What the 2nd floor said is good.

That's right, just use an ordinary metering pump.

1. Overview As an ideal equipment for precision measurement and dosing of fluids, metering pumps have now been widely used in various fields including the pharmaceutical, food and beverage and petrochemical industries. They are responsible for the metering and addition of highly corrosive, toxic, high-viscosity and high-pressure media during the process. After more than half a century of practical application and technological improvement, metering pumps have now entered a period of rapid growth. Now, the mature power drive method and liquid delivery end (pump head) material technology enable the new metering pump to meet the requirements of conveying almost any conventional and special media, and its working pressure and capacity can also meet most requirements of industrial production. With the general improvement of people's requirements for production process indicators and automation level, the safety and controllability of metering pumps, as the final execution agency of chemical agent metering and addition, have become increasingly important. The petrochemical industry and other industries have always been known for their high degree of automation in the production process. They are also one of the most widely used fields of distributed, distributed and intelligent computer control systems. Therefore, the matching actuator-metering pump must also have flexible and diverse control modes, and can easily form various control loops with the computer system to achieve more complex and precise process control. In order to comply with this new trend, internationally renowned metering pump manufacturers such as Germany's Prominent Company, while ensuring that the traditional performance of their products continues to lead the world, have integrated a variety of adjustment control functions and data communication protocols into metering pumps with the help of embedded microprocessor systems, truly realizing two-dimensional adjustment from stroke frequency to stroke length, making their products the world's first intelligent precision metering pump. 2. The basic working principle of metering pumps As we all know, metering pumps are mainly composed of three parts: power drive, fluid transportation and regulation control. The power drive device drives the fluid transport diaphragm (piston) to achieve reciprocating motion through a mechanical linkage system.: The diaphragm (piston) will be sucked in by the conveyed fluid in the first half of the stroke and discharged from the pump head in the second half of the stroke. ； Therefore, changing the reciprocating frequency of the stroke or the stroke length of each reciprocating motion can achieve the purpose of adjusting the fluid delivery volume. The precise machining accuracy ensures the output volume of each pump and achieves precise measurement of the transported medium. Due to their differences in power drive and fluid delivery methods, metering pumps can be roughly divided into two categories: plunger type and diaphragm type. 2.1. Plunger metering pumps mainly include ordinary valve pumps and valveless pumps. Plunger metering pumps are widely used in the petrochemical industry due to their simple structure and high temperature and high pressure resistance. In view of the shortcomings of ordinary plunger pumps for high-viscosity media under high-pressure conditions, a valveless rotary plunger metering pump has received more and more attention and is widely used in the metering of high-viscosity media such as syrup, chocolate, and petroleum additives. Due to the structural shortcoming that complete isolation between the metered medium and the lubricant in the pump cannot be achieved, the plunger metering pump faces many limitations in fluid metering applications with high anti-pollution requirements. 2.2. Diaphragm metering pump As the name suggests, the diaphragm metering pump uses a specially designed and processed flexible diaphragm to replace the piston, and realizes reciprocating motion under the action of the driving mechanism to complete the suction-discharge process. Due to the isolation function of the diaphragm, the structural isolation between the metered fluid and the driving lubrication mechanism is truly realized. High-tech structural design and the selection of new materials have * * With the improved service life of the diaphragm and the excellent corrosion resistance of composite materials, diaphragm metering pumps have now become the main pump type in fluid metering applications. Among the members of the diaphragm metering pump family, the hydraulically driven diaphragm pump uses hydraulic oil to evenly drive the diaphragm, which overcomes the shortcomings of excessive concentration of force on the pump diaphragm under mechanical direct drive mode, and improves the life of the diaphragm and the upper limit of working pressure. In order to overcome possible working failures caused by diaphragm damage in single-diaphragm metering pumps, some metering pumps are equipped with diaphragm damage sensors to realize automatic chain protection when the diaphragm ruptures. ； The metering of the pump head with a double diaphragm structure further improves its safety and is suitable for applications that are particularly sensitive to safety protection. As a type of diaphragm metering pump, the electromagnetic-driven metering pump uses an electromagnet to generate pulsating driving force, eliminating the need for a motor and a transmission mechanism, making the system small and compact. It is an important branch of small-range low-pressure metering pumps. Nowadays, precision metering pump technology is very mature. Its fluid metering and delivery capacity can reach up to 0-100,000l/h, its working pressure can reach up to 4000bar, and its working range covers the requirements of all fields of industrial production. 3. Control of the metering pump The fluid output of the metering pump determines its metering capacity. Under a certain effective diaphragm area, the volume flow rate of the pump's output fluid is proportional to the stroke length L and stroke frequency F: V∝A * F * L When the metering medium and working pressure are determined, two-dimensional adjustment of the metering pump output can be achieved by adjusting the stroke length L and stroke frequency F. Although both stroke length and frequency can be used as adjustment variables, in engineering applications, the stroke length is generally regarded as a coarse adjustment variable and the stroke frequency is a fine adjustment variable.: Adjust the stroke length to a certain value, and then achieve fine adjustment by changing its frequency to increase the flexibility of adjustment. In relatively simple applications, the stroke length can also be set manually and only the stroke frequency is used as the adjustment variable, thus simplifying the system configuration. 3.1. Conventional analog/switch signal adjustment method. In process control applications, 0/4-20mA analog current signal is widely used as the standard for signal exchange between sensors, controllers and actuators. Metering pumps with external control functions also mainly use this method to achieve external adjustment of stroke frequency and stroke frequency. Position servos are the most common method of achieving stroke length adjustment. The integrated servo mechanism is designed to directly accept the 0/4-20mA control signal from the regulator or computer to automatically adjust the stroke length within the range of 0-100%. Relatively speaking, there are many methods to realize stroke frequency adjustment, mainly including variable frequency motor control and direct relay contact control. The frequency converter controlled by the 0/4-20mA current signal drives the metering pump motor to run at the required speed, thereby adjusting the stroke frequency. For electromagnetic-driven and partially motor-driven metering pumps, external contact signals can also be used to adjust the stroke frequency. 3.2. In some special occasions, such as ph value adjustment, the base control method uses the metering pump as an actuator to add acid or alkali under the control of the regulator. In order to simplify system configuration and improve reliability, the embedded control system with a microprocessor as the core is directly integrated into the metering pump, so that only an external pH sensor is needed to form a complete adjustment system. This base-type smart metering pump concept is also suitable for applications such as controlling other process parameters, such as oxidation-reduction potential (ORP) and residual chlorine concentration regulation. 3.3. Set programmed control. Due to the internal integration of microprocessor computers, the control performance and operating performance of some metering pump products have been fully improved. In addition to following external control commands to achieve real-time metering flow adjustment, they also have various working modes such as quantitative addition, time sequence trigger program addition, event sequence trigger program addition, time-event mixed trigger program addition and automatic correction. It can also provide useful information such as the total amount of fluid pumped, the number of remaining strokes and the volume of fluid to be transported, the set stroke length and other related metering pump working parameters. The time sequence trigger program working mode allows the metering pump to completely add the working medium according to the real-time clock and the pre-planned task list at the specified time according to the set number of strokes or time. The time can be flexibly set in cycles of every hour, day, working day, public holiday, one week and two weeks. ； The event sequence trigger program work mode allows the metering pump to completely trigger events in real time, according to a pre-planned task list, and when a specific event occurs (contact input), the working medium is quantitatively added according to the set number of strokes or time. The above two methods can be organically mixed to complete a more complex time-event mixed trigger working mode. Up to 81 events can be set. A simple example is the cooling tower circulating water disinfection and algae removal system. Disinfectants are added at specific concentrations proportional to the make-up water flow rate ； And according to the process requirements, during the proportional addition process, a large dose of disinfectant should be added once a week in pulse mode (for example, set at 12-13 o'clock on Friday), and the proportional addition effect is required to be suspended at this time. The entire programming is very simple, making complex and varied fluid addition tasks easy and precise. 3.4. Fieldbus ProFibus control method is used in large-scale and highly automated applications such as petrochemical industry. It uses digital communication protocols to transmit high-speed data between automated equipment to form a network control system. It has large capacity and high reliability, and has become the mainstream of development. After being incorporated into the German DIN standard in the early 1990s, the fieldbus ProFibus became a European standard (EN50170) in the late 1990s. It has been widely adopted around the world and has become one of the representative protocols in fieldbus technology. The field bus ProFibus consists of three forms. ProFibus-DP, ProFibus-PA and ProFibus-FMS. Among them, ProFibus-DP (DecentralizedPeriphery) is defined as a distributed peripheral equipment fieldbus, which is specially designed for high-speed data information exchange between process control systems and distributed peripheral equipment. The transmission medium is RS485 transmission format connected by twisted pair or optical fiber, with a baud rate of 9.6-12Mb/s. The system has low cost, high speed and reliability. The fieldbus ProFibus instruction set is concise and concise, making programming very convenient. Metering pumps with fieldbus ProFibus communication functions, while having all manual adjustment functions, can be easily integrated into advanced distributed computer control systems, allowing their various functions to be fully utilized, and have become the leader in modern precision metering pumps. There are three series and dozens of models of products in Prominent's metering pump family equipped with fieldbus functions.

An ordinary plunger pump can meet your requirements.

Pipeline pump, magnetic pump, sewage pump, fluoroplastic pump 1. Hydraulic mud pump for geological drilling. The existing mud pump uses an electric motor to drive the crankshaft and connecting rod to push the piston to output mud. This structure has been used for many years and the technology is backward, which makes the mud pump bulky, the output mud pressure fluctuates, and the flow rate is unstable. The maximum power of the mud pump is limited. Generally, the pressure can only reach 3 to 4 MPa, and the flow rate is not easy to be large. The volume of the hydraulic mud pump manufactured by applying this patented technology is only 1/2 to 1/3 of the existing mud pump at the same output power, and the energy consumption is about 80% of the existing mud pump. Although the manufacturing cost is slightly increased, there is no power limit in the design of hydraulic mud pumps. The output pressure can reach tens of MPa, the flow rate can be infinitely expanded, and the output pressure and flow rate are stable. Wear-resistant welding rod 2. The hydraulic high-pressure pump for seawater desalination uses reverse osmosis technology, which is a seawater desalination technology that is highly efficient and easy to use on a large scale. It has broad application prospects today when water resources are scarce. The high-pressure pump is a key equipment in the application of reverse osmosis seawater desalination technology. Existing high-pressure pumps are basically mechanical structures. Commonly used pump types are single-stage, high-speed centrifugal pumps, plunger pumps and multi-stage centrifugal pumps. Generally, single-stage centrifugal pumps have the lowest efficiency, and plunger pumps have the highest efficiency. Multi-stage centrifugal pumps are often used in large systems. in the country, there is no professional manufacturer of high-pressure pumps for seawater desalination. The main reason is that: In order for the high-pressure pump to achieve higher efficiency, some important components must be processed with high precision, which requires very professional and expensive processing equipment and high processing costs. Therefore, the price of imported high-pressure pumps is very high. 　　Compared with mechanical high-pressure pumps and plunger pumps, the working efficiency of hydraulic automatic reciprocating cylinder high-pressure pumps is greatly improved, and high power is easily achieved. Compared with imported similar products, the greater the power of the pump, the lower the production cost, and the greater the price drop. 　　3. High-pressure cleaning equipment 4. Water supply for high-rise buildings (fire pump) In short, the automatic reciprocating hydraulic system has broadened the application scope of the hydraulic system, allowing the hydraulic system to take advantage of its advantages of high efficiency, flexibility, high power and low cost. After application, it will bring huge economic and social benefits to the enterprise. Source of information: Dosing device http://www.shby.com.cn/

Milton Royle (Miton Royle), our company uses this, it is good, generally not bad, and meets your process requirements. Maintenance is also easy. Our company imports one for about 20,000 yuan, you can consider it.

The plunger type and hydraulic diaphragm metering pumps produced by our company can fully meet the requirements of the original poster. Flow rate 0.2~30000L/h, pressure normal pressure to 65mpa. Temperature -20~190℃. Hangzhou Daquan Pump Technology Co., Ltd., Zhou 13968186029