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What could be a reason that the reducing valves (RV, CRV) will not obtain the proper pressure?

This could be due to a few reasons: 1. Make sure that the inlet pressure is not too high or too low, adjust the pressure to the appropriate level. 2. Is the valve's size smaller that what is required? If so, change the valve to the correct size. 3.Another reason may be that the adjustment wasn’t appropriate. Readjust the valve: Open the valve on the drip leg, this allows the bucket steam trap to drain condensate. Close the gate valves before and after reducing valve, slowly open the bypass valve to allow steam to blow through the bypass line. Loosen the jam nut at the top of the valve. Slowly open the inlet side’s gate valve to the fully open position, and partially open the outlet side’s gate valve, so that only a small amount of steam can pass. Turn the adjustment screw clockwise until the desired pressure is obtained. Open the outlet’s gate valve so it is in the fully opened position. Adjust the pressure again after the system has stabilized. Turning the adjustment screw clockwise will increase the pressure, turning it counter-clockwise will decrease the pressure. Tighten the jam nut to secure the adjustment screw in place. 4. Make sure the strainer on the inlet side is not clogged with debris. Check the strainer and clean its screen. 5. If all of these steps have been checked, the pressure gauge may be out of order, and should be replaced