Latching Valves

Latching valves are a type of valves that belong to solenoid valves, which provide the bi-stable operation based on the permanent magnet to keep the valve in both the closed and open position while under the pressure force. 

Latching valves are latching solenoid valves, which often utilize electrical current pulse (but sometimes may also use inner permanent magnet materials) to keep a set position with no constant application of an electrical current. When the current flows in one direction, it energizes the coil field in the solenoid set, and it will add to the pull of the permanent magnet item. 


The Basis of Latching Valves and Solenoid Valves

Since latching valves are solenoid valves, we have to know about the operation of this type of valves before we dig further into the latching works. In the valve industry a solenoid valve is an electromechanically operated valve, which is different in several features such as the electric current they use, the strength of the magnetic field they can generate, the mechanism they utilize to regulate the fluid substance, and the kind and characteristics of fluid substance they control. 

In fact, the mechanism varies from linear action, plunger-type actuators to pivoted-armature actuators and rocker actuators, and the valve can adopt a two-port design to regulate a flow, or it can use a three or more port design to switch flows between the ports for the operation. 

Within the inventory, multiple solenoid valves can be installed together on a manifold. Solenoid valves are the most frequently used control elements in the fluidics field. The assigned tasks of them are designed to do, shut off, release, distribute or mix the targeted fluid substances. As a result, this kind of unit can be seen in many application fields. 

For the further discussion of the solenoid valves, let’s firstly come to know about the essence of valve units as the first step. In the plumbing and tube sector, a valve is generally recognized as a device or natural object that regulates, directs or controls the flow of a fluid by opening, closing, or obstructing a portion of the port for the fluids.

Generally speaking, valves are fittings, while in the specific term, they can be categorized by means of the applications and utilizations of them. When in the open state, the fluid flows in the direction where there is a variation of fluid pressure, as with the natural principle.  

In the past, a valve was simply a hinged flap that is dropped to obstruct the fluid flow in a specific direction, but is pushed open by flow in the opposite direction. For this kind of valve, it is called a check valve, because it works to prevent or check the flow in one direction. On the other hand, modern control valves may regulate pressure or flow downstream and operate on sophisticated automation systems for complex goals. 


Composition and Parts

The main components of the most usual type of valves are two parts: The body and the bonnet. The body and the bonnet make the casing of the valve, which supports the fluid as it passes through the valve. First of all, let’s take a look at the body by the description. The valve's body is the outer casing of most parts of the valve that contains the inner parts, and the bonnet is the part of the encasing by which the guide and seal are formed for the stem as it passes through. Typically, the bonnet screws into the valve body, so valve bodies are usually metallic or plastic and are usually firm and stern enough. It is necessary for the case to stand with. 


Direction and Valves

Since the two way solenoid valves have two ports, an inlet and the outlet respectively, it is critical for the flow direction to be ensured for the proper operation, and normally there would be an arrow icon there to indicate the flow direction. Moreover, as normal latching valves are supposed to offer bi-stable operations, which are usually based on the structure design to maintain the valve body in both the open and the closed position when it is under the stresses, the entire structure shall be well estimated. Only with a well managed and inspected valve structure, can the latching valves exert the best use of its own structure for the following usages.

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