ISC Sales, Inc. Pump Control Valves 106/206-HC

This valve opens as the higher inlet pressure lifts the inner valve assembly and the fluid in the upper chamber is discharged to the lower pressure, downstream side of the valve. When pressure is reversed, the now higher downstream pressure is applied to the upper operating chamber as flow reversal occurs. Product Information: Our pump control valves substantially reduce surges that occur when a pump starts or stops. ISC’s pump control valves are smart, they know when to open, when to close and they do it effortlessly. The pump control valve is normally closed and on pump start-up, a pilot solenoid is energized to open the valve, at a rate governed by the opening speed control. When shut-down is required the pilot solenoid on the valve is de-energized to commence closing. The pump is kept running while the valve slowly closes. When the valve is almost fully closed and flow is virtually zero, a stem mounted cam triggers the limit switch to stop the pump. In the event of a power failure, the built-in mechanical drop check closes immediately when the flow stops, independently of the valve position. Surges are minimized by closing the valve before reverse flow occurs.