Which is a good BURKERT solenoid valve

　　German BURKERT electromagnetic valveBrand Introduction:

BURKERT， Baode, founded nearly 70 years ago, has 5 factories in Germany and France. It is a multinational enterprise specializing in the research and manufacturing of products and systems in the field of fluid control.

BURKERT products are widely used in fields such as analytical instruments, automotive manufacturing, biotechnology, chemistry, electronics, energy, genetic engineering, semiconductors, cosmetics, food and beverage, beer industry, mechanical engineering, medical, healthcare, textiles, packaging, water (sewage) treatment, satellites, space experiments, nuclear reactors, deep-sea exploration, etc.

As a technology enterprise, Burkert's "epoxy resin encapsulated coils" and "cable connection plugs" have become international ISO quality standards. Burkert's invention of the "pilot armature electromagnetic system", "rocker arm solenoid valve", and "pulse coil" * is horizontal.

BURKERT products are roughly divided into six categories: "universal solenoid valve systems," "process control valve systems," "pneumatic control valve systems," "liquid analysis valve systems," "sensors/transmitters," and "controllers," many of which meet hygiene standards.

Working Principle:

　　German BURKERT electromagnetic valveThere is a sealed chamber inside, with through holes at different positions, each leading to a different oil pipe. The middle of the chamber is a valve, and there are two electromagnets on both sides. The magnetic coil on which side is energized will attract the valve body to which side. By controlling the movement of the valve body, different oil discharge holes can be blocked or leaked out. The oil inlet hole is normally open, and hydraulic oil will enter different oil discharge pipes. Then, the pressure of the oil will push the piston of the cylinder, which in turn drives the piston rod, and the piston rod drives the mechanical device to move. In this way, the mechanical motion is controlled by controlling the current of the electromagnet.

Classification:

1. BURKERT solenoid valves can be divided into three main categories based on their principles

Direct acting solenoid valve

Principle of BURKERT solenoid valve: When powered on, the solenoid coil generates electromagnetic force to lift the closing member from the valve seat, and the valve opens; When the power is cut off, the electromagnetic force disappears, and the spring presses the closing member against the valve seat, causing the valve to close. Characteristics: It can work normally under vacuum, negative pressure, and zero pressure, but the diameter generally does not exceed 25mm.

Distributed direct acting solenoid valve

Principle of BURKERT solenoid valve: It is a combination of direct action and pilot operated principle. When there is no pressure difference between the inlet and outlet, after being energized, the electromagnetic force directly lifts the pilot small valve and the main valve closing member upward in sequence, and the valve opens. When the inlet and outlet reach the starting pressure difference, after being energized, the electromagnetic force pilot small valve, the lower chamber pressure of the main valve rises, and the upper chamber pressure drops, thereby using the pressure difference to push the main valve upwards; When the power is cut off, the pilot valve uses spring force or medium pressure to push the closing member downwards, causing the valve to close. Features: It can also operate under zero pressure difference, vacuum, and high pressure, but with high power, it must be installed horizontally.

Pilot operated solenoid valve

Principle of BURKERT solenoid valve: When powered on, the electromagnetic force opens the pilot hole, causing the pressure in the upper chamber to rapidly decrease, creating a high and low pressure difference around the closing member. The fluid pressure pushes the closing member upward, and the valve opens; When the power is cut off, the spring force closes the pilot hole, and the inlet pressure quickly forms a lower and higher pressure difference around the closing valve through the bypass hole. The fluid pressure pushes the closing valve to move downward and close the valve. Features: The upper limit of the fluid pressure range is relatively high, and it can be installed freely (customized), but it must meet the fluid pressure difference conditions. 2. Electromagnetic valves are divided into six sub categories based on differences in valve structure, materials, and principles: direct acting diaphragm structure, step-by-step heavy plate structure, pilot diaphragm structure, direct acting piston structure, step-by-step direct acting piston structure, and pilot piston structure.

Precautions for BURKERT solenoid valve:

applicability

The fluid in the pipeline must be consistent with the medium calibrated in the selected solenoid valve series model. The temperature of the fluid must be lower than the calibration temperature of the selected solenoid valve. Electromagnetic valves allow liquid viscosity to generally be below 20CST, and if it exceeds 20CST, it should be noted. When the working pressure difference and high pressure difference of pipeline z are less than 0.04MPa, direct acting and step-by-step direct acting types such as ZS, 2W, ZQDF, ZCM series should be selected; When the working pressure difference of Z is greater than 0.04MPa, a pilot operated (differential pressure) solenoid valve can be selected; The working pressure difference should be less than the calibration pressure of the solenoid valve; Generally, solenoid valves work in a one-way manner, so attention should be paid to whether there is a reverse pressure difference, and if a check valve is installed. When the fluid cleanliness is not high, a filter should be installed in front of the solenoid valve. Generally, solenoid valves require good cleanliness of the medium. Pay attention to the flow aperture and pipe diameter; Electromagnetic valves are generally only controlled by a switch with two positions; If conditions permit, please install a bypass pipe for easy maintenance; When there is water hammer phenomenon, it is necessary to customize the opening and closing time adjustment of the solenoid valve. Pay attention to the influence of environmental temperature on solenoid valves. The power supply current and power consumption should be selected according to the output capacity. The power supply voltage is generally allowed to be around ± 10%. It is necessary to pay attention to the high VA value during AC starting.

reliability

BURKERT solenoid valves are divided into two types: normally closed and normally open; Generally, the normally closed type is selected, which opens when powered on and closes when powered off; But when the opening time is long and the closing time is short, the normally open type should be selected. Life testing is generally a type testing project in factories. To be precise, there is no professional standard for solenoid valves in China, so caution should be exercised when selecting solenoid valve manufacturers. When the action time is short and the frequency is high, the direct action type is generally selected, and the fast series is selected for large caliber.

safety

Generally, BURKERT solenoid valves are not waterproof. If conditions do not allow, please choose waterproof types. The factory can customize them. The nominal pressure of the z-high calibration of the solenoid valve must exceed the z-high pressure inside the pipeline, otherwise the service life will be shortened or other unexpected situations may occur. For corrosive liquids, all stainless steel type should be selected, and for highly corrosive fluids, Plastic King (SLF) solenoid valves should be used. Explosive environments require the use of corresponding explosion-proof products.

economy

There are many BURKERT solenoid valves that can be used universally, but Z economical products should be selected on the basis of meeting the above three points. The selection of solenoid valves should first follow the four principles of safety, reliability, applicability, and economy. Secondly, the selection should be based on six aspects of on-site conditions (i.e. pipeline parameters, fluid parameters, pressure parameters, electrical parameters, action mode, and special requirements).

Selection criteria:

Pipeline parameters

Diameter specification (i.e. DN), interface method 1. Determine the diameter (DN) size according to the on-site pipeline inner diameter size or flow requirements. 2. Interface method, generally>DN50 requires flange interface, ≤ DN50 can be freely selected according to user needs.

Fluid parameters

Material and Temperature Group 1: Corrosive Fluid: It is recommended to use corrosion-resistant solenoid valves and all stainless steel; Edible ultra clean fluid: It is recommended to use food grade stainless steel solenoid valves. 2. High temperature fluid: It is necessary to choose electromagnetic valves made of high-temperature resistant electrical materials and sealing materials, and to choose piston type structures. 3. Fluid state: ranging from gaseous, liquid or mixed state, especially when ordering with a diameter greater than DN25, it must be distinguished. 4. Fluid viscosity: Usually below 50cSt, it can be freely selected. If it exceeds this value, a high viscosity solenoid valve should be used.

pressure parameter

BURKERT solenoid valve principle and structural variety 1. Nominal pressure: This parameter has the same meaning as other general valves and is determined based on the nominal pressure of the pipeline. 2. Work pressure: If the work pressure is low, the principle of direct action or step-by-step direct action must be selected; When the working pressure difference of Z is above 0.04Mpa, direct acting, step-by-step direct acting, and pilot operated can all be selected.