Mer-Made offers two different styles of float valves. This velocity will generally give line losses which are much smaller than the losses through the modulating valve. Maximum flow in a suction line is normally 6 feet per second of water velocity. The valve tables are limited to a maximum water velocity of six feet per second. To this depth you must add an estimate of the losses in the main drain line before the valve. The Model 8102 is applicable anywhere it is necessary to automatically maintain an essentially constant level in storage tanks or reservoirs. Drillmax Drill Pipe (DP) Float valves are available for standard service, H2S 300☏ service (HNBR/HSN) and H2S 400☏ service. When correctly installed on the drill string these blue valves provide added blowout prevention. Note that the depth from the chart is not all that is required. The blue float valve prevents drilling fluids, cuttings and metal debris from flowing back up the drill string. Use the charts given to select a valve and minimum depth needed to achieve the flow rate for the pool turnover you require. See table #1 for values of depth versus flow. If the depth and size of the line are incorrect the proper flow rate will not be attainable. The resistance to flow between these two opening positions establishes the minimum depth required for the center of the main drain line so that the desired flow can be maintained. The optimum operating condition for the float controlled valve is between 60% and 70% open. Modulating (float) valves are not tight-closing, in fact, our valves are designed to pass some flow when the ball is in the full up or “closed” position, so as not to stop main drain flow entirely. This configuration requires the use of the XWB modification. A manual valve must be mounted on the "T" leg which can be closed from the deck (long shaft on the handle) to allow pump suction on the pipe from the main drain. The "T" configuration allows the pool to be pumped out via the main drain line. The elbow directs the flow below the water level to minimize the turbulence and the associated generation of chlorine fumes. The basic float valve is the disc configuration (FV) which can be fitted with an elbow or "T". Maximum flow in a suction line is normally 6 feet per second of water velocity. At full closed, the valve will flow at approximately 20% of the maximum water velocity.
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