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- Ross - Model 45-WR - Deep Well Pump ...
Ross - Model 45-WR -Deep Well Pump Valve
The deep well pump control valve shall be located off a tee connection from the main line in order to blow off air or sand particles agitated by the pump starting. Because the valve is fully open when the pump starts and then slowly closes, it effectively discharges unwanted media from the system before water flows through the main line. In addition, the valve insures a smooth stopping and starting flow in the system by closing slowly after the pump starts and being 95% open before the pump stops.
The pump control valve shall be globe (inline) or angle (90 degree) body with flanged end connections, be fully mounted, external 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. 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.