CLA-VAL 40-30 : Rate of Flow Non-Surge Check Valve
The Cla-Val Model 40-30 Rate of Flow Non-Surge Check Valve is a hydraulically operated, pilot controlled, diaphragm actuated control valve that limits flow to a preselected maximum rate, regardless of changing line pressure. The pilot control repsonds to the differential pressure produced across an orifice plate installed upstream of the valve. Accurate control is assured as very small changes in the controlling differential pressure produce immediate corrective action of the main valve. The orifice bore is factory sized based on flow rate to ensure proper control valve performance. Flow rate adjustments can be made by turning an adjusting screw on the pilot control. The integrated check feature protects upstream equipment like pumps by admitting downstream pressure into the main valve cover chamber, closing the main valve upon pressure reversal.