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Valve uses small solenoids to tame high pressures
Festo has introduced the VZWF, a force pilot operated solenoid valve that can be used with water, air and neutral media. This new valve utilizes relatively small solenoids to control high pressures with large nominal diameters. The units can switch at pressures as low as 0 bar and close automatically in the case of a pressure loss in the circuit. Additionally, they can be applied in closed media circuits.
The VZWF series is generally suitable for applications in which the medium can be vented downstream of the valve into the atmosphere or a tank. The VZWP is used for gaseous and liquid material flows with viscosities of up to 22 sq mm per second. One of the VZWP’s special features is that the pressure of the medium supports actuation. Smaller coils can be used with the VZWP because of the low power requirements to open the valve—the energy of the medium contributes to opening.
The VZWF is a 2/2-way, normally closed poppet valve with a return spring. The series includes brass and stainless steel options with a choice of NBR, FKM or EPDM seat-seal material. The valves come with either NPT or G threads. Units should be mounted with the coil on top. Sizes range from 0.5 to 2 in. Operating pressure ranges from 0 to 10 bar, depending on coils used and nominal diameter. The process valve’s nominal pressure is PN 40.
Applications for the VZWF include filling systems (secondary circuit), water treatment, pipeline construction, steam boiler construction, liquid gas installations, hot water applications, heating circuits, power plant systems, petrochemical industry, pump systems, storage tank installations and pneumatic automation systems.
“Gas and liquid valve solutions expand Festo’s process offering that already include lines of ball, butterfly and gate gas-only valves and automated controls,” said Craig Correia, Festo process industry segment manager. “Process valves provide OEMs and end users the convenience, quality and dependability of a one-stop-shop for both discrete and process automation solutions from Festo. And Festo offers a host of online productivity tools that speed up time to market.”