Solenoid valves for sale use an electrical signal to control the flow of fluids. Precisely, We use solenoid valves to open, close, mix or distribute fluids with two or more openings. Using solenoids in fluid control is fast and effective. They require clean liquids or gases to operate at optimum levels. Application of solenoid valves includes heating systems, compressed air systems, vacuum, automated irrigation, and car washes.
Components of solenoid valves
Solenoid valves for sale contain two major parts, i.e., the solenoid and valve body. The components of the solenoid valve are;
- The valve body – Contains features that allow the solenoid to attach to the line.
- Coil windings – Composed of a wire wound around a magnetic core. However, the function of the coil is to move the plunger, restricting and blocking media flow in the valve.
- Plunger – this is an iron-made cylindrical part that moves to open and close the valve. The plunger controls the movement of media in the valve.
- Inlet valve – opening that allows media flow into the valve. Solenoid valves can have one or more inlets.
- Outlet valve – refers to an opening that allows the media to flow out of the solenoid valve. Solenoid valves for sale can have more than one outlet.
- Solenoid coil – the solenoid coil is the body of the valve coil. It is hallowed, round, and made from a metal body.
- Solenoid spring – The function of the spring is to provide the tension needed to keep the plunger in position.
- Lead wires – Lead wires convey current from the power supply to the electrical valve circuit.
- Orifice – is located between the outlet and inlet of the valve.
- Sealing disc – Provides the part that shuts down the valve. The gasket should be able to resist corrosion and kept clean.
- Diaphragm – Diaphragms is used in pilot-operated solenoid valves because it close the central orifice from the action of pressure difference.
- Armature tube – It’s a hollow part that guide plunger when moving up and down. Furthermore, keep it free from dirt to reduce heat damage to the plunger.
Types of solenoid valves for sale
There are various types of solenoid valves for sale. We generally group solenoid valves according to their application, shape, and construction. In short, the types of solenoid valves under the application type are;
- Direct-acting solenoid valves
- Pilot operated solenoid valves
Pilot operated solenoid valves for sale.
Pilot-operated solenoid valves utilize the pressure difference between the outlet and inlet to open and close the valve. A diaphragm separates the inlet and outlet. The diaphragm has a hole that permits fluid flow to the upper chamber. The inlet pressure and the spring will ensure the valve remains closed for normally closed pilot-operated solenoid valves. The plunger closes the connection between the chamber and the outlet to close the valve. After energizing the solenoid valve, the pilot orifice opens, causing a pressure drop above the membrane. As a result, the pressure drop lifts the membrane, opening the valve.
The pressure chamber above the membrane acts as an amplifier, enabling a small solenoid to control large volumes of water. The minimum operating pressure differential required in this system is about 0.5 bars.
Normally closed solenoid valves
When the coil is energized in normally closed solenoid valves, the electromagnetic force pushes the plunger upwards, resisting the spring force. This opens the valve allowing flow. The valve is closed when the coils are de-energized. The plunger falls downwards, blocking the water flow path.
Normally opened solenoid valves.
Normally opened solenoid valves for sale are opposite to normally closed solenoid valves. The magnetic force pushes the plunger downwards when the coils are energized, closing the valve. However, when we cut the current supply to open the valve, the plunger is pulled by the spring to its original position.
Bi-stable solenoid valves
A momentary power supply can switch these latching solenoid valves. The plunger can stay in position without a power supply. They use permanent magnets to achieve this rather than springs.
Role of automatic irrigation in large irrigation projects
Automatic irrigation involves using sensors and irrigation timers to control water flow in the system automatically. Automated irrigation systems use a computer to control water and nutrient supply to the plants. Sensors and timers determine the appropriate time to irrigate. Solenoid valves are fast and can effectively manage water flow in the systems. Sensors or timers determine when it is time to irrigate the farm. An irrigation timer sends an electric current to the solenoid valves to start the irrigation process. The valve is opened depending on the solenoid type, allowing water to flow into the system.
Solenoid valves for sale can mix media in the system. This quality is beneficial for controlling fertiliser application in the system. To automate the fertigation systems, we use a three-way solenoid that allows the mixing of fluids. These valves need to operate with clean water, or clogging will occur. Clogging of solenoid valves results in leakages, reduced lifetime, and unreliable operation.
The advantages of using automatic irrigation in large irrigation projects are:
- There is water-saving – the systems deliver water at the right time and quantities saving on water.
- Energy-saving – automation reduces water use, eventually reducing pumping costs.
- Reduced labour costs – there is automatic watering, removing the need for many employees.
- Increased farming efficiency– the automatic irrigation system monitors the plants’ water and nutrient needs. This results in increased yield at the end of the season.
- Reduced pollution – the irrigation system applies fertiliser in the right quantities avoiding leaching into underground water sources.
- Time-saving – there is simultaneous watering of crops, saving time.
Role of solenoid valves for sale in precision irrigation
Precision irrigation is a form of irrigation where nutrients and water are supplied to the plants at the appropriate time and quantities. The increased world population has led to the continuous depletion of the already scarce natural resources. The number of mouths to feed has increased, with the resources needed to grow the food being the same. Precision irrigation reduces the burden on resources by efficiently using the minimal resources available.
The use of solenoid valves for sale in precision irrigation methods helps control water and nutrient supply to the plants. The types of precision irrigation methods are; surface irrigation, drip irrigation, sprinkler irrigation, and subsurface irrigation.
Application of solenoid valves for sale
Solenoid valves control fluid flow in systems, making them have many domestic and industrial applications. Some of the applications of solenoid valves for sale are:
- Irrigation systems use solenoid valves to control the flow of nutrients and water into the pipes.
- Refrigeration systems use solenoid valves to reverse the flow of the refrigerant, helping in cooling or heating depending on the season.
- Automatic locking doors use these valves to lock the doors.
- Washing machines and dishwashers use these valves to control water flow.
- Solenoid valves help control airflow in air conditioning systems.
- We use a float switch together with solenoid valves to control the inflow and outflow of water in tanks.
- Car washes to control the flow of water and soap.
- Industrial equipment uses solenoid valves to control the flow of water
- Dental equipment utilises these valves to control the fluid’s flow, pressure, and direction.
Selection criteria for solenoid valves for sale
The type of solenoid valves for sale available to choose is vital in determining the performance of the systems. We usually use these criteria to determine the type of valve to choose.
- Housing material – the type of housing material is selected based on the chemical properties of the fluid, the temperature of the liquid, and environmental factors. We use brass material for valves that use neutral media. Stainless steel has good chemical, temperature, and pressure resistance. PVC material is cost-effective.
- Type of solenoid valves – it is essential to know whether your system needs a three-way or two-way valve.
- Seal material – the selection of the seal material depends on the chemical properties and temperature of the media. The choice of the seal material affects its life span and performance.
- Voltage – Solenoid valves can use direct current (DC) or alternating current (AC). For instance, when using AC valves, the spring can overcome the force generated for a short period of time. This problem manifests as vibrations of the armature producing a humming sound. Hence, the vibrations cause stress on the valve causing leaks over time. The manufacturers place a shading ring around the armature to counter this problem. Accumulation of dirt particles on the armature affects the performance of the shading ring. It is essential to ensure the fluid is clean. Additionally, AC solenoid valves for sale can use direct current (DC), but you must limit the voltage and current.
Other selection criteria
- Valve function – normally closing or normally open valves are available under this criterion. The choice valve is dependent on the operation time. If the valve closing time is longer than the opening time, we use the normally open valve. If the valve opening time is longer than the closing time, we use normally closing valves.
- Pressure – the selected valve must be able to withstand the maximum pressures of the system.
- Operation type – this determines whether the application will need a direct or pilot-oriented solenoid valve.
- Temperature – the valve materials selected should be able to withstand the minimum and maximum temperatures during application. Temperature affects the viscosity and flow of the fluid.
- Response time – refers to the time it takes the solenoid valve to switch from opening to closing or vice versa. Small direct solenoid valves react faster than pilot-oriented solenoid valves.
- Approvals – ensuring the valve is appropriately certified depending on the application.
- Application degree – the valve should have adequate protection against dust and contact.
Installation of automatic irrigation systems by Eunidrip Irrigation Systems.
At Eunidrip Irrigation Systems, we have the best specialist and equipment to help you automate your irrigation. Our prices are fair, and we make sure the customers get the best services. Automation equipment needed includes irrigation timers, solenoid valves, sensors, etc.,
Common problems encountered when using solenoid valves
Some of the common issues encountered while using solenoid valves are strange sounds while the valve is in use, the valve doesn’t open, the valve closing partially, problems with the coil, and lousy installation.
This occurs when the valve is in use during opening and closing. The reasons for the sound during opening and closing can be;
- A small gap between the electromagnetic coil and the plunger wall.
- The lock-nut of the coil is loose.
- The pressure difference between the inlet and outlet causes a wandering sound.
- As water under high pressure passes through a small hole in the pipe, it produces a hammering sound.
The valve doesn’t open.
The reasons that can cause the solenoid valves not to open are;
- Uneven water pressures.
- Dirt particles in the diagram.
- Corrosion of the valve.
- Power disconnection.
- One or two missing components.
- Burns in coils.
- Use of low voltage.
The valve partially closes.
Partial closing of solenoid valves occurs because many reasons. Reasons that can result in partial closing of the valves are;
- Pressure differences between the inlet and outlet
- The armature tube is damaged
- Manual override of the system.
- Residual magnetism in the solenoid valve.
- Damaged seals
- Lack of specific components.
Issues with the coil
The two significant issues experienced with electromagnetic coils are coil burning and also coil staying cold when power is turned on. The causes of this problem can be;
- Slow coil armatures.
- Short circuits.
- High temperatures of the fluid.
- Low voltages.
The farmer should ensure that the power supply is compatible with the rated coil supply voltage. Subsequently, Check for humidity in the valve and replace the coils when necessary. You should replace the armature if it is damaged or bent to avoid having coil problems.
The solenoid valves usually come indicated with arrows showing the direction of flow. However, you should install the solenoid valves in the right direction to avoid reverse pressures in the valve. Of course, the presence of reverse pressure will result in improperly closing the solenoid valve. You should install the valve horizontally or at a 300 angle. Solenoid valves installed vertically suffer from reliability issues.
Advantages of solenoid valves
- Leakage management – Solenoid valves can completely block external leaking and control internal leaking.
- They have a quick response time and are lightweight – these valves are small, saving room space. They also have a fast response time.
- Solenoid valves are simple, cheap, and accessible – their installation and maintenance are more straightforward than other valves.
- They have a wide application.
Maintenance of solenoid valves for sale.
With proper care, solenoid valves can serve for a long time before needing replacement also you should carry out maintenance practices regularly on the valves.
The standard maintenance procedure are;
- Disconnecting the power source and also depressurizing the system.
- Remove the coil and inspect the valve components. The seal should not be swollen, cracked, or damaged. You should also check on the spring for damage and also ensure the orifice body is okay.
- You should replace the worn-out part. In addition, Lubrication is done on the valve to reduce wear and tear. If the solenoid valve uses water as a fluid, you should clean the valve regularly to avoid mineral buildup. The water filter should also be clean to filter out the dirt particles.