Proportional valves

Single-channel proportional control valve is a smart valve that operates digitally, featuring on/off and proportional closed-loop control. Proportional single valves are two ways valves, which are capable of completely separating the fluid path. They are ideal for dosing or dispensing both gas and liquids with high accuracy, and exhibit no drift over time. Moreover, the design of each valve can be easily customized on functional requirements of various applications.

Dolphin Fluidics offers dual-channels electronically controlled proportional valves consisting of two separate channels in and out, each featuring normally closed, on/off, and proportional closed-loop control. They are well-suited for applications involving dosing, dispensing, or mixing fluids, whether gases or liquids, with exceptional precision and no time drift. As they enable independent control of two channels, dual-channel valves serve as true fluid modules that are integrated into a single device, thereby allowing customers to minimize space, weight, wiring, and consequently, costs associated with their equipment.

A hydraulic proportional valve’s main function is to determine a change in flow or in pressure, regulated by the opening of a plunger. Typically, the change in flow is determined by the displacement of the moving element, which is actuated by a shape memory electrical actuator.

Working principle

How do proportional hydraulic valves work? Electronically controlled hydraulic proportional valves have an important point of divergence from on-off control valves. While in the latter the actuator can assume only two positions-total opening and total closing, in hydraulic proportional valves, it can also position itself at intermediate levels. This allows hydraulic flows to flow in a proportional and controlled manner.

Dolphin Fluidics' hydraulic proportional valves find wide use not only in electromedical machines but also in intelligent sanitary systems, faucets, and various professional devices in the food & beverage industry.

Proportional water flow valve is a normally closed, 2-way valve that incorporates proportional closed-loop control. Dolphin offers the Smart HP Liquid, an optimal solution for precise dosing or dispensing of liquids, including water, even under high pressure, without any drift over time. It is also characterized by its low power consumption, which is up to 20 times less than conventional solenoid valves, as well as its silent operation. Moreover, this water-proportional flow control valve can be interfaced directly with external sensors measuring pressure, flow, or temperature. This allows for closed-loop control to ensure the target fluid dynamic function is achieved.

Dolphin’s proportional flow valve for gas offers a precise and consistent solution for dosing or dispensing gas, with no time drift. Customization of each valve is effortless to ensure they meet even the most demanding functional requirements of various applications. This includes adjustment of the electronic and mechanical interface, fluidic performance, and control electronics and communication on IoT platforms. Depending on the industry, single-channel or two-channel valves are ideal for dosing or dispensing gas.