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- Ross - Model 42-AFCV - Throttling ...
Ross - Model 42-AFCV -Throttling Electric Valve
The flow control valve shall be globe (inline) or angle (90 degree) body with flanged end connections, be fully mounted, external solenoid pilot operated, with free floating piston (operated without springs, diaphragm or levers). It shall contain a single full-ported seat, with seat bore equal to size of valve. The minimum travel of the piston shall be equal to 25% of the diameter of the seat. For true alignment (to correct lateral thrust and stem binding), the piston shall be guided above and below the seat a distance equal to no less than 75% of the diameter of the seat.
DESIGN
The piston shall be cushioned and so designed as to insure positive closure. The main valve shall be packed with leather (or other soft material) to insure tight closure and prevent metal-to-metal friction and seating. The valve shall be furnished with an indicator rod to show position of piston opening, and pet-cocks for attachment to valve body for receiving gauges for testing purposes. The design shall be such that repairs and dismantling internally of main valve may be made without its removal from the line.
The solenoid pilot valve(s), controlling operation of the main valve, shall be easily accessible and arranged to allow for easy removal from the main valve while the main valve is under pressure. The solenoid pilot valve(s), speed control valve(s), external strainer with blow-off, isolation valves, and all associated rigid brass piping and fittings shall be factory assembled and furnished with the valve.
The solenoid operated (throttling) flow control valve shall receive a control signal to automatically maintain a constant rate of flow. The valve is operated by hydraulic pressure control, via independent opening and closing solenoids and speed controls. In the event of a power failure, the valve can be configured to "lock" in its last position, go fully closed, or go fully open.