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Dampening effect of surge suppressor is not sufficient. Surge suppressor installed incorrect distance from pump Surge suppressor should be installed within 10 pipe diameters of pump discharge. Improper pressure charge See Charging and Startup, page 8. Surge suppressor pressure should be 2 to 10 psi (0.01 to 0.07 MPa, 0.1 to 0.7 bar) lower than system pressure. Surge suppressor does not hold pressure charge. See surge suppressor does not hold pressure in PROBLEM column. Failed bladder or bellows See Bladder Failure, page 10. Surge suppressor too small for pump Install larger surge suppressor. Automatic models only: Plugged automatic valve Remove pressure from surge suppressor, and check automatic valve for proper operation as follows: 1. Leave air line attached to top half of surge suppressor. 2. Fill top of surge suppressor with enough water to cover automatic valve. There should be no bubbles. 3. Dump water out, and gently push automatic valve. Air should flow. 4. Replace automatic valve if it is defective. There is leaking around surge suppressor fluid inlet. PTFE sealing tape or paste is needed on threads of fluid inlet. Apply PTFE tape or paste to threads. Do not overtighten plastic models. Hand tightening is recommended. . . Service Bladder Failure Replacing Bladder or Bellows Normal life for bladders can be from a few months to several years, depending upon the harshness of the application. Below are common reasons for failed bladders or bellows: . Chemical attack: Check chemical compatibility charts. Consult your Graco distributor. . Cut bladder or bellows: Check for sharp objects that may have been introduced into the surge suppressor through pumped fluid. . Insufficient compressed air charge in surge suppressor during operation: See Charging and Startup on page 8. . Surge suppressor too small for the pump: An undersized surge suppressor will have premature bladder failure. Contact your Graco distributor for assistance in ensuring that you have the correct size surge suppressor. 1. Relieve the pressure. WARNING To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 7. 2. Remove the clamp band, ring flange, or bolts. 3. Remove the top housing of the surge suppressor. 4. Remove the old bladder or bellows, and replace it with the new bladder or bellows. Make sure that you properly orient the parts: . Install rubber bladders with the concave side facing the top housing, as shown in the Parts Drawings on page 14. . Install PTFE bellows with the concave side facing the bottom housing, as shown in Model No. 239126 in the Parts Drawings on page 15. Install the PTFE encapsulated fluoroelastomer o-rings on each side of the bellows. 5. Replace the top housing of the surge suppressor. 6. Replace the clamp band, ring flange, or bolts, and torque according to the torque specifications in the Torque Table on page 11. . . Service Torque Table Find the proper torque specifi...

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