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3. Reassemble the valve by placing the valve insert in the valve housing using the larger (3/16”) dowel pin
provided (1373 and 1374 valves use a total of 3 washers, one is installed before installing the valve
insert). Make sure it is oriented correctly (see Figure 4.4). Press a CTFE seal into place. Slide the
valve cartridge into the valve housing making certain it is oriented correctly. Press another new CTFE
seal into place. The CTFE seal will extend approximately 0.020 – 0.030” from the valve housing.
4. Re-install the rebuilt valve into the liquid end assembly and tighten by hand until just finger-tight. Then
use a ½” wrench and tighten ¼ turn more. You should tighten valves to the point at which no further
leakage occurs, or not more than 4.5 ft./lbs.
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