Diaphragm valve 40-01/640-01 series

flow control

The Cla-Val Mode 40-01/640-01 Rate of Flow Control Valve consist of three major components the body with installed seat, the cover with bearing installed and the diaphragm assembly, it shall be the only moving element and shall form a sealed chamber in the top portion of the valve,separating operation pressure from line pressure. To continue, the packing glands and/or stuffing boxes are not allowed and there shall be no pistons operating the main valve or pilot controls. The Cla-Val Model 40-01 Rate of Flow Control Valve prevents excessive flow by limiting flow to a preselected maximum rate, regardless of changing line pressure. It is a hydraulically operated, pilot controlled, diaphragm valve. The pilot control responds to the differential pressure roduced across an orifice plate installed downstream of the valve. Accurate control is assured as very small changes in the controlling differential pressure produce immediate corrective action of the main valve. Flow rate adjustments are made by turning an adjusting screw on the pilot control.