Product category:
Valve Hardware (Filters, Flow Controls, Positioners etc)
News Release from: Tyco Flow Controls | Subject: Keystone F250/251
Edited by the Engineeringtalk Editorial
Team on 14 August 2003
Hygienic and maintenance-friendly flow
control
A new range of hygienic butterfly valves has been specially designed for sanitary and aseptic applications in the food, dairy, brewing, pharmaceutical and chemical industries.
Hygienic butterfly valves specially designed for sanitary and aseptic applications in the food, dairy, brewing, pharmaceutical and chemical industries have been developed by Tyco Valves and Controls The Keystone stainless steel F250 (for imperial tube configurations) and F251 (for metric) valves are designed for both isolation and flow control duties, and can be supplied with either standard butt weld and threaded end connections, or in a unique wafer-flanged configuration for applications involving minimal pipe separation
This article was originally published on Engineeringtalk on 5 Jun 2003 at 8.00am (UK)
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Both valve types are supplied with a 316L stainless body as standard.
The wafer weld configuration features integral butt weld flanges, separated by two stainless steel jacking bolts.
This facilitates removal of the centre valve section for maintenance or replacement, without disturbing the connecting process pipeline.
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The maintenance friendly wafer configuration allows for substantial cost and time savings, a significant reduction in plant downtime, and facilitates spares identification.
To ensure the highest possible integrity of process media, the butterfly valves are available with food grade seat and seal material options.
Acetal bearings above and below the valve seat decrease torque and extend seat life.
Standard features on both configurations include integral valve position indicator, a mirror-polished high-Cv slim-profile disc and integral padlocking.
This high impact description is relative to the nylon lever only and should be removed in total.
The F250 and 251 are offered with a full range of optional actuation and control accessories, including the Keystone fig 257 vertical actuator, and the fig 783 electronic control head.
Incorporating a 'mansafe' spring design for full maintenance capability, the fig 257 vertical actuator can be connected and disconnected from the valve in seconds without removing the valve from the process pipeline, due to a unique mounting arrangement.
The fig 783 IP67 control head features an integral solenoid with throttling of both open and closed exhausts, which enables speed control in both directions of operation.
Suitable for pressures from full vacuum to 1000kPa (10bar) and temperatures from -10 to +95C, the valve body is constructed from 316L stainless steel.
End connection sizes range from 25 to 150mm.
Fig 250 and 251 are also available as part of a network solutions package, compatible with leading fieldbus protocols including ASI and DeviceNet.
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