In any sort of application where the managing of the fluids has to be controlled, you can use the solenoid pinch valves. The use of pinch valves ensures precise & accurate operations. The control unit features the electronic oil along with the plunger that either opens or shuts off the small orifice. And it allows or restricts the liquids & gasses to flow. Further in the article, we will discuss various types of proportional valves, their features, and their application.
What is a Solenoid Valve?
The solenoid pinch valves are known to be the electro-mechanical device that is used to manage the flow of liquids and gasses. The pinch valve consists of two main components: the solenoid and its body. The components of a proportional solenoid valve have an inductive coil & movable ferromagnetic core in its center. Usually, the solenoid valves are used for controlling the clean fluids as they are sensitive to dirt. The basic function of the valve is to close, open, or mix the fluid with two or more two inlets & outlets.
In the resting position, the solenoid pinch valves can normally be closed or open. There can’t be an opening or closing state if there is no current on the coil. When the coil is energized, a magnetic field is created, exerting the EMF on the plunger that overcomes the spring force. And this will help the plunger to either open the orifice or close the orifice for the NC valves.
Solenoid Valves Circuit Functions and Valve Types:
The circuit of the pneumatic pinch valve specifies that the function of the valve is either opening, closing, mixing, or distributing the fluids. There are two main functions of the pinch valve circuit that the two or three-way solenoid valves can perform. The two-way solenoid pinch valve has outlet & inlet ports that open or close the orifice. While the three-way valve has 3 ports, it has two states or positions. The latter is used to open, close, distribute, or mix the fluid, switching between two circuits.
When it comes to the types of solenoid pinch valves, then they have two commonly used types. They are called normally open and normally closed. The normally open valve type is an ideal option for the application that requires the solenoid to be open for extended time periods. They are more energy-efficient, so you need not be stressed about the power consumption.
How Proportional Valve Works:
The solenoid pinch valves have three main types depending on the working principles. In other words, they are categorized as indirect-acting, direct-acting, and semi-direct acting. Below we are going to discuss the working principles by considering these categories.
Direct Acting Solenoid Valves:
The maximum flow rate & operating pressure are directly proportional to the magnetic force of solenoid and orifice diameter with direct-acting solenoid pinch valves. It means that the direct-acting solenoids are used for the small flow rates.
Indirect Acting Solenoid Valves:
This type of solenoid pinch valves uses the pressure between the medium over the inlet & outlet ports to open or close the valve. Mostly these category-type valves need a minimum pressure difference of 0.5 bar. The rubber membrane in between the inlet & outlet of the valve is called the diaphragm.
Semi-direct Acting Solenoid Valves:
The semi-direct acting solenoid pinch valves combine features of both the types of pneumatic valves. They are operated from the zero bar & they still handle a high rate of flow.