Poppet valves meet maximum safety demands
An
Asco Numatics product story
Edited by the Engineeringtalk editorial team
Jul 5, 2005
A new series of poppet valves satisfies the requirements for the highest levels of operating safety SIL-4/AK-7 in explosive and hazardous environments.
Asco Joucomatic's new TUV-certified (IEC61508) 327 series of poppet valves satisfies the requirements for the highest levels of operating safety SIL-4/AK-7 in explosive and hazardous environments.
The 327 series is intended for high flow applications in oil, gas and chemicals industries, where there is a requirement for large process valves and actuators (especially diaphragm types) to be opened and closed, quickly and safely.
The 327 series is manufactured with either stainless steel (AISI 316) or brass bodies, and stainless steel internals, for use on a wide range of fluids including air, inert gas, water and oil.
It is designed for pilot applications in hazardous environments: those requiring, high flow, wide pressure ranges and no minimum operating pressure.
In these applications, the valves' direct operating mechanism ensures more reliability over periods of prolonged operation.
This the result of a design that obviates the requirement for bleed holes that could introduce corrosion inducing air into the valve.
An additional advantage of the design is that the direct acting mechanism operates on zero pressure differentials, so the valve has no required minimum operating pressure.
Complementing this design feature, special seals and PTFE riderring ensure that the valves will reset reliably, without sticking, after long periods energised.
The 327 valves are supported by one of the widest ranges of ATEX approved enclosures and operators available.
These range from epoxy moulded units (IP65/II 3G/2D EEx nA II) to IP67- rated, stainless steel epoxy coated enclosures (EEx em II), which meet all the requirements of EN50019, EN50028 and 50281-1-1.
Also designed for use with the 327 valves is Asco Joucomatic's new (WS)NF/NL family of flameproof operators.
Meeting Category 2 requirements of the ATEX Directive (II 2 G/D EEx d IIC), the operators are manufactured in stainless steel (WSNF), cast iron (NL), and lightweight aluminium (NF), which is epoxy coated to combat corrosion.
All the new operators are available as both push or pull type solenoids and can be supplied on a wide range of Asco Joucomatic valves including direct acting solenoid and solenoid pilot operated types in 2/2 3/2 and 5/2 configurations.
They offer ingress protection to IP67 and are easy to install via a combination of a screw terminal coil and the provision of an industry standard 0.5in NPT threaded cable entry, the latter also being offered in an M20 option.
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