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If the valve is not mounted on a panel, or if the adjusting screw is difficult to turn, loosen each of the three stator screws before adjusting the adjusting screw. Be sure to retighten these screws when you are finished and before testing.
Model 7125
The three stator screws in the valve stator are used to adjust the pressure setting. The valve has been factory set to hold 34 MPa (340 bar, 5000 psi). If there is leakage between the stator and stator ring, then proceed as follows. Unscrew the three set screws part-way out from the stator. Tighten down the three stator screws until they just start to grip, then tighten an additional 1/4 turn. Reconnect the valve to your system and pump solvent through at about 500 psi above the normal operating pressure or the pressure to which you want the valve adjusted.
If there is a leak, continue to tighten the three stator screws 1/8 turn each until the leak stops (see Fig. 11). Confirm that the gap between the stator and stator ring is the same width all the way around. Finish by screwing in the set screws until they touch the stator ring.
Models 8125/8126
(manufactured through 6/92)
A single pressure adjusting screw at the shaft-end of the valve body is used to adjust the pressure setting. The valve has been factory set to hold 34 MPa (345 bar, 5000 psi). If there is leakage between the stator and stator ring, proceed as follows.Remove the knob assembly and slip the pressure adjusting nut onto the valve shaft so the tabs on the nut fit into the slots in the adjusting screw. Tighten the adjusting screw about 1/20th of a turn. Use the twenty dial markings on the body and the painted spot on the adjusting screw as guides.
If the new setting does not stop the leakage, repeat the procedure by tightening an additional 1/20th turn. Finish by replacing the knob and retightening the two knob set screws onto the flats on the shaft.
Models 3725, 7725/7726, 9725,9726
(and Models 8125/8126 manufactured after 6/92)
A single pressure adjusting screw at the shaft end of the valve body is used to adjust the pressure setting. The valve has been factory set to hold 34 MPa (340 bar, 5000 psi). If there is leakage between the stator and stator ring, proceed as follows.The knob assembly is designed with two tabs which can be used to turn the adjusting screw. To use it, loosen the two set screws in the knob, so the knob slips down the shaft and the tabs fit into the slots on the adjusting screw. Tighten the adjusting screw about 1/20th of a turn. Use the twenty dial markings on the body and the painted spot on the adjusting screw as guides.
If the new setting does not stop the leakage, repeat the procedure by an additional 1/20th turn. Finish by replacing the knob and retightening the knob set screws onto the flats on the shaft.
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