What are Solenoid Valves ?

- Electromagnetic solenoid valves (otherwise also known as solenoid valves) are valves controlled by electric current. They consist of two main parts - the valve body and the solenoid (coil). The solenoid is composed of a wound copper wire that surrounds a core with a movable closing plunger.

- The task of the coil is to create a magnetic field by means of a passing electric current, which then moves the piston and either opens or closes the valve. Solenoid valves thus use electric current to convert into linear motion.

Structure of Solenoid Valves

Van điện từ có 2 dạng chính sau: Van điện từ màng tức là Indirectly operated valves (Pilot-operated) và Van điện từ piton tức Directly operated valves (Direct acting) và chúng được phâm ra làm các loại sau:

• Indirectly Operated Solenoid Valve (Pilot Operated Solenoid Valve)

- Indirectly operated valves, sometimes also called pilot-operated, operate on the principle of differential pressure between inlet and outlet. In this case, the valve orifice is closed by a diaphragm which separates the inlet and outlet openings. There is a hole in the diaphragm through which the medium can flow into the chamber above from the inlet. This balances pressure acting on the diaphragm and it remains closed.

- Again, let's take a normally closed valve as an example. When the valve is not energized, the diaphragm is pushed down by the spring and pressure increasing in the chamber above the diaphragm. The diaphragm thus closes the valve and media can't flow. The chamber above the diaphragm is connected to outlet opening by a small channel (pilot orifice) which is closed by a piston. When the coil is energized, it lifts the piston up, allowing media to flow through the pilot orifice into outlet. Because it is larger than the smaller orifice, pressure above the diaphragm is decreased, while pressure in the inlet orifice remains the same and now even higher. It thus lifts the diaphragm and allows media to flow into the outlet. Differential pressure ranges from 0.3 bar to 1 bar. With a normally open valve, the operating principle is exactly the opposite.

Structure of Pilot Operated Solenoid Valve

• Directly Operated Solenoid Valve  (Direct acting Solenoid Valve)

- Directly operated valves work on a very simple principle. For this example, we will have a normally closed valve. Once the solenoid is deenergized, its spring pushes on the plunger, which then closes the orifice of the valve and rests on the seal. Once power is turned on, the coil pulls the plunger up and opens the solenoid. With a normally open valve, it is exactly the opposite.

- These solenoids are used more for small flows where there isn't a high pressure. They do not require any pressure or pressure difference for operation, so they can be used even at zero line pressure.

Structure of Direct Acting Solenoid Valve

How Does a Solenoid Valve Work ?

Van sử dụng hiện tượng cảm ứng điện từ để hoạt động. Bên trong van đều có 1 cuộn lõi dây điện quấn quanh 1 lõi sắt và 1 lò xo nén giữ lõi sắt này. Mặt khác, chiếc lõi sắt được giữ dưới lớp gioăng cao su. Khi dòng điện đi qua cuộn dây thì sinh ra dòng từ trường. Dòng từ trường này sẽ hút piston đi lên. Khi piston rời khỏi vị trí ban đầu sẽ giúp cho dòng lưu chất đi qua hoặc chặn hoàn toàn dòng lưu chất ( theo từng loại van điện từ thường đóng hoặc van điện từ thường mở). Van thường đóng mở rất nhanh, gần như tức thì, vì thế nên van được kiểm soát lưu lượng gần như một cách tuyệt đối. 

Nguyên Lý Hoạt Động Van Điện Từ

Types of Solenoid Valves

• Types of Normally Open / Closed Solenoid Valves

- Normally Closed Solenoid Valve (NC Solenoid Valve) :

When powered the plunger is pulled up due to the magnetic field. The valve thus opens to allow the medium to flow. The force of the magnetic field raises the plunger against the spring, which in turn pushes it back down. When power gets interrupted, magnetic field disappears and the plunger spring compresses it back to its original position. The valve is thus closed. This is a more widely used variant for safety reasons in the events of a power failure. Xem Chi Tiết Về: Van Điện Từ Thường Đóng

- Normally Open Solenoid Valve (NO Solenoid Valve): 

Allows the medium to flow without power. The plunger is pulled always out and the medium can flow through the valve. However, when powered, magnetic field pushes the plunger down and closes the valve. This variant is mainly used in applications where it is more energy efficient to have the valve open for a longer time.Xem Chi Tiết Về: Van Điện Từ Thường Mở

• Types of Solenoid Valves Materials

- Bronze / Brass Solenoid Valve: Xem Chi Tiết Về: Van Điện Từ Đồng

Van Điện Từ Đồng

- Stainless Steel Solenoid Valve: 

- Aluminum Solenoid Valve: Xem Chi Tiết Về: Van Điện Từ Nhôm

- Plastic Solenoid Valves: Xem Chi Tiết Về: Van Điện Từ Nhựa

 

- Van Điện Từ Gang: Van được chế tạo từ gang cầu hoặc gang dẻo, gang là một kim loại có độ cứng khá cao,chịu mài mòn tốt và hấp thụ tiếng ồn tốt, chịu nhiệt độ áp suất vừa phải. Các loại van này thường được chế tạo kết nối mặt bích.

 

Where is A Solenoid Valve Used ?

Solenoid valve applications include a broad range of industrial settings, including general on-off control, plant control loops, process control systems and various original equipment manufacturer applications, to name but a few.

Solenoid valves can be found in many different sectors, including:

- Water supply

- Treatment of drinking water

- Waste water treatment

- Purification/ treatment of grey and black water

- Machine and plant engineering

- Cooling, lubrication and dosing

- Building services

- Large heating systems, climate control

- Safety engineering

- Water mains protection and fire extinguishing systems

- Compressors

- Pressure relief and drainage

- Fuel supply

- Transport and tank facilities

- Firing systems

- Oil and gas burner control

- Gas chromatography

- Gas mixture regulation

- Blood analysis instruments

- Control of cleaning processes

Plastic Solenoid Valves

- Plastic Solenoid Valves are designed to handle a range of media and aggressive substances, depending on the valve selected and it’s configuration. Suitable for alkalis, alkaline washing and bleaching lyes, oxydizing acids and substances, salt solutions, oils, gases and vacuum depending on the model, seal material and valve configuration.

- Plastic solenoid valves are for use in releasing, distributing and mixing fluids in industrial applications.

- Make your selection from our range of Plastic, PVC (Polyvinyl chloride, hard), PP (Polypropylene) and PVDF (Polyvinylidene fluoride) solenoid valves; available to order online from internationally recognised brands including Burkert and GEMU, GSR...

Technical Plastic Solenoid Valves

Types of Plastic Solenoid Valves

Application of Plastic Solenoid Valves

 

 

Bronze / Brass Solenoid Valves

- Brass Solenoid Valves are manufactured and designed to suit a range of applications and media including: clear liquids and gases such as water and compressed air. Available to order online in normally closed or normally open function, direct acting, assisted lift or servo assisted with various seal materials, ratings and sizes from 1/8” up to 3”.

- Select the valve you need for your application from internationally recognised brands including Burkert, GEMU and VOLT.

Stainless Steel Solenoid Valves

- Stainless Steel Solenoid Valves are manufactured and designed to suit a range of applications and media including: clear liquids and gases such as water, compressed air and slightly more aggressive chemicals. Available to order online in normally closed or normally open function, direct acting, assisted lift or servo assisted with various seal materials, ratings and sizes from 1/8” up to 3”.

- Select the valve you need for your application from internationally recognised brands including Burkert, GEMU and VOLT.

Technical Stainless Steel Solenoid Valves

- Size of SS Solenoid Valves :

+ Diametre nominal : DN8, DN10, DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN125, DN150

+ Inch : 1/2″, 3/4″, 1″, 1-1/4″, 1-1/2″, 2″, 2-1/2″, 3″, 4″, 5", 6"

- Body Material of SS Solenoid Valves: Inox 304, Inox 316

- Gasket : EPDM, NBR, PTFE

- Điện áp: 12V, 24V, 110V, 220V

- Temperature range: up to 220 độ

- Types of SS Solenoid Valves : Normally Open Solenoid Valves / Closed Solenoid Valves

- Thời gian đóng mở: 0.5s

- Thời gian ngâm điện: 24h 

- Pressure range of SS Solenoid Valve: 10Bar - 16Bar

- Áp lực mở: 0,5 Bar 

- Kết nối of SS Solenoid Valve: Ren trong, mặt bích

- Sử dụng of SS Solenoid Valve: Nước,dầu,khí gas, hơi nóng, hóa chất,...

- Origin of SS Solenoid Valve: Korea, Taiwan, Japan, China, Italia

What is A Normal Open Solenoid Valve

- Normal Open Solenoid Valve :  A normally open solenoid valve controls the flow of gas or liquid. This valve differs in the way that the flow is started or stopped. When a normally open solenoid valve is not powered, the plunger is down, which means that a flow is allowed through the valve.

What is A Normally Closed Solenoid Valve

- Normally closed solenoid valves include a plunger that remains in a closed position when the system is running smoothly, like pressure relief valves. Normally closed solenoid valves also include a coil that, when powered, will cause the plunger to open and allow liquid or gas to pass through the valve.

- Van thường đóng là loại van đóng khi cuộn dây điện từ không có điện và mở khi cuộn dây điện từ có điện ( Van điện từ NC – Normal Closed )

ATEX Solenoid Valves

- ATEX approved solenoid valves are designed exclusively for demanding ATEX environments and hazardous locations.

- Many of these products are used in process and industrial applications around the globe including: chemical, industrial, pharmaceutical, food manufacturing, power plant and water treatment installations; many of which can be found in hazardous locations.

- Make your selection from our range of 2/2 and 3/2 way ATEX solenoid valves, available to order online with both Ex and IS coils, seal and body configurations and accompanying accessories. Solenoid valves from internationally recognised brands including Burkert, GEMU and VOLT.

Technical ATEX Solenoid Valve

- Size ATEX Solenoid Valve: DN15-DN50

- Materials of ATEX Solenoid Valve: Đồng, inox

- Điện áp: 24v, 220v

- Pressure range: 0-16 bar

- Temperature range: 0 - 180 độ C

- Media workings of  ATEX Solenoid Valve: Gas, Petroleum...

- Connections ends of ATEX Solenoid Valve: Threaded ends or Flanged ends

- Manufacturer's Brands: GSR, ODE, RoundStar, Burkert, GEMU and VOLT…

- Origin: Germany, Taiwan, Italy, …