Pilot valves for harsh environments
08 December 2015
The VOFD is a robust new pilot valve from Festo designed for use in process automation applications such as pharmaceutical, chemical, petrochemical and oil and gas industries, which are often considered to be harsh environments.
The valve can actuate butterfly valves, cylinders, diaphragm drives and rotary drives and is also said to be suitable for emergency shut-down functions and for safety-orientated systems up to Safety Integrity Level 4 (SIL 4) as per IEC 61508.
The VOFD features a titanium dioxide plated surface which gives it high abrasion resistance and makes it resilient within aggressive and chemical atmospheres. It is also available with several Ex-protection methods and provides ATEX protection for zone 1/21 (gas and dust). Reliability of the 3/2-way valves is ensured as an exhaust protector means that no atmosphere or environmental contaminants can enter the valve and degrade it. Internal and external pilot air functions have been integrated into a single valve and it can be converted simply by turning a screw depending on the function required.
The valve has two connection options – a NAMUR-port for direct installation on an actuator as well as G and NPT threads for in line connection. No tubing is required and as the valves are installed directly on a drive, offering set-up time and cost savings.
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