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Difference between revisions of "Shutting Gate Valves"
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[[File:Shutting gate valve.JPG|thumb|right|Shutting Gate Valves]] | |||
* | '''Shutting Gate Valve''' is an ATEX safety system for explosion isolation. Consequently, the valve closes very fast at detection. Furthermore, it is able to withstand the pressure resulting from the explosion pressure and once closed, it prevents propagation of the flame. | ||
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==Functioning of shutting gate valve== | |||
===Fast closing for your safety=== | |||
The [[Gate Valves]] are equipped with a small gas generator . When triggered by the control unit, the gas generator produces an enormous amount of gas within a few milliseconds, which drives the valve blade with great force and closes the valve. The blade's travel is slowed at the end of the stroke. Afterwards, the valve can be slowly re-opened.A manual lock prevents the valve from fast closing during service if the gas generator were to be triggered unexpectedly. | |||
===Slow opening and closing=== | |||
In addition to the safety function, the valve can be slowly opened and closed in various ways by means of compressed air. | |||
* By simple local intervention. | |||
* From the user's PLC. This control can be extended with a function that closes the valve automatically when control power drops. | |||
* Completely controlled by an optional interface . In addition to the opening and closing functions, this interface monitors the time taken to open and close. If the time for slow opening and closing is too long, a fault is indicated . The interface is also connected to the control unit, which excludes incorrect actions. | |||
===Position indication=== | |||
In addition to the signalling contacts from the control unit and the interface, the gate valve has its own mechanical position indicator. An electronic indicator is available as an option. | |||