The CHECK VALVE FEATURE is used to prevent flow reversal. The check option is available separately or with most on/off and reactive control functions. The SLEEVE EXHAUST is a special valve used to exhaust water from the sleeve chamber and allow fast opening response on the valve. The sleeve exhaust is most often used with turbine well pumps. During start-up a column of water begins moving at high velocity. When the water contacts the valve, quick opening is required to prevent damage. SPECIAL ON/OFF MODE VALVES are used where standard valves don't work due to system requirements. An example of this is the hydraulic remote control which eliminates the need for wires in the field. Contact the factory for specific details on the special function valve control.

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