A variable valve is a valve that can change its output in response to changes in electrical input. These valves are also known as electro pneumatic regulator valves and have some similarities to servo-hydraulic valves as well as electrically controlled valves in both. In this valve, the valve spool is actuated with the help of a solenoid. The main difference between servo valves and the proportional valve is Servo valves are used in closed loop systems. While proportional pressure control valve are used in open loop and closed loop systems.
What are the characteristics of proportional solenoid valves?
These valves have a closed loop control system. Therefore, the valve is controlled with the help of electrical sensor input. With this feature, therefore, proportional pressure control valve are used in many applications. These valves also have some safety features, for example in the event of a power outage or if the power input is interrupted. The valve will close immediately as proportional air valves have a long service life and require very little maintenance. The solenoid operator has only one moving part.
Making of proportional valve
On the proportional pressure control valve, the spool is made of hardened steel. And the body is made of high-quality, painted hydraulic casting. Zinc-plated solenoids and electro pneumatic pressure regulator housings are made from aluminum. Proportional slider spool on casting. Robust construction similar to directional valves have a high flow capacity and are also inexpensive. The throttle area is formed by a notch cut into the spool. The size and geometry of the notch determine the flow capacity of a given casing.
How does a proportional valve work?
The proportional flow control valve can be considered a combination of hydraulic valve actuation with advanced electronic control. The hydraulic circuit is reduced by a proportional valve. When a proportional pressure control valve is used it will reduce the number of components in the system. The accuracy and efficiency of the system are improved by the use of proportional valves. The proportional directional control valve varies the fluid flow according to the electrical input signal. These valves produce an output proportional to the electric pressure regulator input. Outputs come in three forms: direction, pressure, and flow. The coils in most valves operate on direct current and can be caused by different voltages. This creates a different force and this force is used to move the reel. These valves are of high efficiency and precision. And the remote operation is another advantage of this valve. These valves can control cylinders or other hydraulic motors.
Points to consider while choosing the right regulator
- It can be selected according to the process used for flow or control pressure regulator.
- Check if the operating temperature of the system is suitable for the proportional pressure control valve.
- Repeated checks are valve flow rates so choose accordingly.
- Inverse sensitivity is the change in electrical input required to change the flow rate.
- The threshold is the electrical input required to flow from the zero position.