Commercial Valve Troubleshooting Webinar Valve Cross
Contents
1. Adapter Example Solenoid Seal Is Missing Eee White Solenoid Seal Should Be Here PROBLEM Solenoid seal has been removed The pilot dump hole cannot be closed and the valve runs full open continuously SOLUTION Replace the solenoid seal CONFIDENTIAL FOR INTERNAL USE ONLY September 15 2010 No Close Weeping Or Full Open Hole Or Crack in Diaphragm Example Debris Has Cut Hole In Diaphragm PROBLEM A hole in the diaphragm On forward flow valves this hole geg wa Pi Rain Bird Corporation Page 10 r A allows the pressure to equalize on both sides of the diaphragm and keeps the valve open SOLUTION Replace the diaphragm assembly CONFIDENTIAL FOR INTERNAL USE ONLY Rain Bird Corporation No Close Weeping Or Full Open Debris on Plunger Seal Example Rock Has Been Wedged In Valve Seal PROBLEM Debris has been deposited on the valve seal This blocks the valve from closing SOLUTION Remove debris If the valve seal or seat is damaged or distorted such replace the entire diaphragm assembly September 15 2010 Page 12 No Close Weeping Valve Seal Pop Out Example PEB Valve Seal Has Pulled Away T Seal Support From Support 73 PROBLEM The main valve seal is pulled away from its co molded plast2. FOR INTERNAL USE ONLY Rain Bird Corporation Page 19 September 15 2010 Valve Leaks At Body To Bonnet Misaligned Diaphragm Tab PROBLEM The diaphragm tab is not lined up with the pilot exhaust port which prevents the diaphragm from sealing in that area This results in a significant external leak SOLUTION Install new diaphragm Make sure the hole in the tab fits over the exhaust port CONFIDENTIAL FOR INTERNAL USE ONLY Rain Bird Corporation September 15 2010 Page 20 Valve Leaks At Body To Bonnet Misaligned Diaphragm PROBLEM The outer diaphragm bead has been crushed as a result of not being installed in the groove in the body This results in a significant external leak SOLUTION Install a new diaphragm taking care to make sure the diaphragm bead fits the body grove all the way around the circumference CONFIDENTIAL FOR INTERNAL USE ONLY Rain Bird Corporation 10 September 15 2010 Page 21 Valve Leaks At Stem Extruded O Ring Seal PROBLEM The o ring that seals the flow control stem extrudes out of the bonnet under pressure if misapplied Water then leaks externally around the stem SOLUTION Replace o ring being careful to lubricate it first CONFIDENTIAL FOR INTERNAL USE ONLY Rain Bird Corporation Septem
3. O ring Is Not In Groove PROBLEM The adapter o ring is either damaged or installed improperly The valve pilot is vented to atmosphere which allows the valve to stay open constantly or intermittently SOLUTION Replace the o ring or replace the adapter assembly CONFIDENTIAL FOR INTERNAL USE ONLY Rain Bird Corporation September 15 2010 No Close Weeping Or Full Open Debris on Plunger Seal Example Debris Has Plunger Lodged In e Seal Face Seal Face a PROBLEM Debris has been deposited on the plunger seal face The plunger cannot seal off the pilot dump hole which keeps the valve open SOLUTION Remove the plunger rinse with water and reinstall If seal has been damaged replace the plunger or replace solenoid assembly CONFIDENTIAL FOR INTERNAL USE ONLY Rain Bird Corporation September 15 2010 No Close Weeping Or Full Open Deformed Solenoid Seal Solenoid Solenoid Bowl Good Seal Damaged Seal bk PROBLEM The solenoid seal is damaged from over tightening the solenoid assembly into the solenoid bowl Even though the solenoid is de energized the valve stays open because the pilot exhaust is not sealed off SOLUTION Replace the solenoid seal CONFIDENTIAL FOR INTERNAL USE ONLY Rain Bird Corporation September 15 2010 No Close Full Open Missing Parts Solenoid
4. RAINY BIRD Commercial Valve Troubleshooting Webinar Harland Hirtzel Product Manager September 15 2010 CONFIDENTIAL FOR INTERNAL USE ONLY September 15 2010 Valve Cross Sectional View f CONFIDENTIAL FOR INTERNAL USE ONLY Rain Bird Corporation September 15 2010 Valve Components FLOW CONTROL SOLENOID COIL PLUNGER VALVE BONNET A I SOLENOID SEAL DIAPHRAGM PILOT EXHAUST VALVE BODY e GTS VALVE SEAL PILOT FILTER VALVE SEAT CONFIDENTIAL FOR INTERNAL USE ONLY Rain Bird Corporation September 15 2010 No Close Weeping Or Full Open Loose Solenoid Example Gap Is Too Wide PROBLEM The solenoid is not fully tightened The pilot dump line will be constantly open which in turn keeps the valve open SOLUTION Tighten the solenoid using the handle wrench to hand tight CONFIDENTIAL FOR INTERNAL USE ONLY Rain Bird Corporation September 15 2010 No Close Weeping Or Full Open Solenoid O Ring Damage Example O ring Is Nicked PROBLEM The solenoid o ring is damaged Pilot is vented to atmosphere which allows the valve to stay open constantly or intermittently SOLUTION Replace the o ring or replace solenoid assembly CONFIDENTIAL FOR INTERNAL USE ONLY Rain Bird Corporation September 15 2010 No Close Weeping Or Full Open Adapter O Ring Damage Example
5. ber 15 2010 Page 22 Valve Leaks At Inlet Connection Cracked Body PROBLEM A stress fatigue crack starts at the highest stress concentration point inside the valve and propagates out through the threaded connection SOLUTION Replace the valve Rain Bird Corporation CONFIDENTIAL FOR INTERNAL USE ONLY 11 September 15 2010 CONFIDENTIAL FOR INTERNAL USE ONLY September 15 2010 CONFIDENTIAL FOR INTERNAL USE ONLY Questions Thank You Rain Bird Corporation Rain Bird Corporation 12
6. ic support at high pressure and temperature With the seal cocked to one side the valve may weep intermittently Difficult to diagnose because it can correct itself SOLUTION Replace the diaphragm assembly CONFIDENTIAL FOR INTERNAL USE ONLY Rain Bird Corporation September 15 2010 Page 13 No Close Weeping Or Full Open Blocked Pilot Hole Filter Diaphragm Assembly Viewed From Top Example Scale Buildup Has Blocked Pilot Hole PROBLEM Debris or scale has blocked the diaphragm pilot hole and or filter This prevents the pressure from equalizing above and below the diaphragm such that it cannot close SOLUTION Clean the diaphragm and filter or replace the entire diaphragm assembly CONFIDENTIAL FOR INTERNAL USE ONLY Rain Bird Corporation September 15 2010 Page 14 No Open Low Or No Flow Blocked Restricted Pilot Holes Bonnet Body PROBLEM Debris is blocking one or more of the pilot channels The valve may only open partially or not at all depending on the severity of the restriction SOLUTION Use a thin probe e g paper clip to clean out the debris Check both the body and bonnet holes CONFIDENTIAL FOR INTERNAL USE ONLY Rain Bird Corporation September 15 2010 Page 15 No Open Low Or No Flow Flow Control Misadjusted PROBLEM The flow control has bee
7. n manually closed or turned down so low that the valve dithers i e cycles open and close quickly SOLUTION Fully open the valve and then adjust flow downward until you reach the desired throw on your heads Then back off 1 2 turn on the flow control CONFIDENTIAL FOR INTERNAL USE ONLY Rain Bird Corporation September 15 2010 Page 16 Valve Leaks at Adapter Pinched O Ring Example O Ring Has Been Extruded Out Of Bonnet PROBLEM The o ring can be damaged if the adapter is not fully tightened into the valve bonnet Then the o ring cannot provide a good seal SOLUTION Replace the o ring or replace the entire adapter assembly CONFIDENTIAL FOR INTERNAL USE ONLY Rain Bird Corporation Valve Leaks At Body To Bonnet f Loose Bolts Or Nuts PGA Valve PEB Valve PROBLEM The bonnet bolts or nuts are not fully tightened down This results in a poor seal at the body diaphragm bonnet interface SOLUTION Tighten down the bolts nuts until the leak disappears September 15 2010 Page 18 Valve Leaks At Body To Bonnet Missing Exhaust Port O Ring O Ring Should Be Here PROBLEM The o ring seal between the bonnet and body for the pilot exhaust port is missing Itis sometimes unknowingly lost during servicing This creates a sizable external leak SOLUTION Replace the o ring CONFIDENTIAL
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