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Troubleshooting Sloan Flush Valves


Need help troubleshooting your Sloan flushometer? Look no further! Some common questions and answers can be found here in our on-line guide offering repair guidance and solutions. Need help finding a part? Check here or contact us.

Regal Flushometer Troubleshooting

A guide to help repair your Regal flush valve

Sloan Regal flush valve

Problem: Flush valve does not function (not flushing).
Cause: Control stop or main valve is closed.
Solution: Open control stop or main valve.
Cause: Handle assembly is worn.
Solution: Install Sloan handle repair kit (B-50-A) or replace handle.
Cause: Relief valve is worn.
Solution: Replace inside parts kit.

Problem: Insufficient volume of water to adequately siphon fixture.
Cause: Control stop not open enough.
Solution: Adjust control stop for desired delivery of water.
Cause: Urinal flushometer parts inside a closet flushometer.
Solution: Replace inside urinal parts with proper closet flushometer parts.
Cause: Low consumption flushometer installed on a non-low consumption fixture.
Solution: Replace A-41-A inside parts kit with A-38-A water saver kit.
Cause: Water saver kit installed in old, non-water saver bowl.
Solution: Position refill head A-170 so that SIDE 1 is in the UP Position.
Cause: Inadequate volume or pressure at supply.
Solution: If no gauges are available to properly measure supply pressure or volume of water at the flushometer, then remove the relief valve from the inside parts kit, reassemble the flushometer and open the control stop.
  • If the fixture siphons, more water volume is required. If a 3.5 gpf inside parts kit is installed in the Flushometer, then first flip the refill head (under the diaphragm) to obtain a 4.5 gpf volume. If this volume is still inadequate, remove the flow ring from the guide to obtain a 6.5 gpf Kit. If additional flow is still required, try a low pressure guide kit A-175-A (# 0301104).
  • Important: Laws and regulations requiring low consumption fixtures (1.6 gpf water closets and 1.0 gpf urinals) prohibit the use of higher flushing volumes.

  • If fixture does not siphon or if a low consumption fixture is installed, or if the above steps do not prove satisfactory, steps must be taken to increase the pressure and/or supply.

Problem: Flushometer closes off immediately.
Cause: Ruptured or damaged Diaphragm.
Cause: Enlarged By-Pass orifice from corrosion or damage.
Solution: Install Inside Parts Kit to correct above problems and update Flushometer.

Problem: Length of flush is too short (Short Flushing).
Cause: Diaphragm assembly and guide assembly are not hand tight.
Solution: Screw the two assemblies hand-tight.
Cause: Enlarged by-pass orifice from corrosion or damage.
Solution: Install NEW inside parts kit to correct problem and update flushometer.
Cause: A-19-AU (black) urinal relief valve in closet flushometer.
Solution: Replace relief valve with A-19-AC (white) closet relief valve.
Cause: A-41-A Low consumption kit installed in non-low consumption fixture.
Solution: Install handle repair kit B-50-A or replace the handle.
Cause: Handle assembly is worn.
Solution: Replace with proper inside parts kit.

Problem: Length of flush is too long (long flushing) or fails to close off.
Cause: Relief valve (A-19-A) is not seating properly or bypass orifice is clogged because of foreign material, or bypass orifice is closed by an invisible gelatinous film from over-treated water.
Solution: Disassemble the working parts and wash thoroughly.
NOTE: Size of orifice in the by-pass is of utmost importance for proper metering of water into the upper chamber of the flushometer. do not enlarge or damage this orifice. replace inside kit if cleaning does not correct problem.
Cause: Line pressure has dropped and is not sufficient to force relief valve to seat.
Solution: Shut off all control stops until pressure has been restored, then open them again.
Cause: A-19-AC (white) closet relief valve has been used in a 1 or 1 1/2 gpf urinal.
Solution: Replace with A-19-AU (black) relief valve.
Cause: Inside cover is cracked or damaged.
Solution: Replace the inside cover (A-71).

Problem: Chattering noise in flushometer.
Cause: The A-156-A segment diaphragm has been installed upside down.
Solution: Replace the segment diaphragm to the proper position as instructed by markings on the diaphragm.
Cause: The inside cover has been distorted from wear, freezing or abuse.
Solution: Replace inside cover.

Problem: Leaking at handle assembly.
Cause: The B-39 seal is worn or deteriorated.
Solution: Install new B-39 seal.
NOTE: The B-39 seal will easily slide right onto the B-40 bushing if it is wet.
Cause: Handle gasket has been omitted.
Solution: Install A-31 handle gasket or Sloan handle repair kit (B-50-A).
Cause: Valve Handle Bushing is worn.
Solution: Install Sloan handle repair kit (B-50-A).

Note: Do not use abrasive or chemical cleaners to clean flushometer that may dull the luster and attack the chrome or decorative finish. Use ONLY soap and water, then wipe dry with a clean towel or cloth.
When cleaning the bathroom tile, protect the Flushometer from any splattering of cleaner. Acids and cleaning fluids can discolor or remove chrome plating.



Royal Flushometer Troubleshooting

A guide to help fix your Royal flush valve

Sloan Royal flush valve
Problem: Flush valve does not function (not flushing).
Cause: Control stop or main valve is closed.
Solution: Open control stop or main valve.
Cause: Handle assembly is damaged.
Solution: Replace B-73-A handle or repair with B-51-A handle repair kit.
Cause: Relief valve is damaged.
Solution: Replace relief valve.

Problem: Handle leaks.
Cause: Handle seal or handle assembly is damaged.
Solution: Replace B-73-A handle or repair with B-51-A handle repair

Problem: Water splashes from fixture.
Cause: Control stop is open wider than necessary.
Solution: Adjust control stop for desired delivery of water volume.
Cause: Water saver/conventional diaphragm assembly is installed on low consumption fixture or closet diaphragm assembly is installed on urinal fixture.
Solution: Determine the required flush volume (see label on valve or markings on fixture). Replace diaphragm assembly or relief valve for appropriate flush volume of fixture.

Problem: Volume of water is insufficient to adequately siphon fixture.
Cause: Control stop is not open wide enough.
Solution: Adjust control stop for desired delivery of water volume.
Cause: Adjust control stop for desired delivery of water volume.
Solution: Replace diaphragm assembly.
Cause: Low consumption diaphragm assembly is installed on water saver/conventional fixture or urinal diaphragm assembly is installed on closet fixture.
Solution: Determine the required flush volume (see label on valve or markings on fixture). Replace diaphragm assembly or relief valve for appropriate flush volume of fixture.
Cause: Inadequate water volume or pressure is available from supply.
Solution: Increase flow rate or pressure to the valve. If gauges are not available to measure supply pressure/volume, remove Relief Valve from Diaphragm Assembly and open the Control Stop.
If the fixture siphons: Additional water volume is required. Install higher flushing volume Relief valve or diaphragm assembly or cut flow ring from guide.
If the fixture DOES NOT siphon (or a low consumption flush is required): Additional steps must be taken to increase the water pressure and/or volume at the water supply. Contact fixture manufacturer for minimum supply requirements of fixture.

Problem: Flushometer valve closes immediately (short flush).
Cause: Worn or damaged diaphragm assembly.
Solution: Replace diaphragm assembly.
Cause: Handle assembly is damaged.
Solution: Replace B-73-A handle or repair with B-51-A handle repair kit.
Cause: Low consumption diaphragm assembly is installed on water saver/conventional fixture or urinal diaphragm assembly is installed on closet fixture.
Solution: Determine the required flush volume (see label on valve or markings on fixture). Replace diaphragm assembly or relief valve for appropriate flush volume of fixture.

Problem: Length of flush is too long (long flush) or fails to shut off.
Cause: Bypass hole (upper filter ring) of diaphragm assembly is dirty.
Solution: Remove the diaphragm assembly. disassemble the filter rings from the diaphragm, wash under running water, and reassemble. Replace as necessary.
Cause: Relief valve or diaphragm assembly is damaged.
Solution: Replace relief valve or diaphragm assembly.
Cause: Water saver/conventional diaphragm assembly is installed on low consumption fixture or closet diaphragm assembly is installed on urinal fixture.
Solution: Determine the required flush volume (see label on valve or markings on fixture). Replace diaphragm assembly or relief valve for appropriate flush volume of fixture.
Cause: Inside cover is damaged.
Solution: Install new A-71 inside cover.
Cause: Line water pressure dropped and is insufficient to close valve.
Solution: Close the control stop until pressure is restored.
Cause: Relief valve is not seated properly.
Solution: Disassemble diaphragm components (relief valve, filter rings, and diaphragm unit), wash under running water, and reassemble. Replace as necessary.

Problem: Chattering noise is heard during flush.
Cause: Inside cover is damaged.
Solution: Install new A-71 inside cover
Cause: Relief valve or diaphragm assembly is damaged
Solution: Replace relief valve or diaphragm assembly.

Note: Do not use abrasive or chemical cleaners to clean flushometer that may dull the luster and attack the chrome or decorative finish. Use ONLY soap and water, then wipe dry with a clean towel or cloth.
When cleaning the bathroom tile, protect the flushometer from any splattering of cleaner. Acids and cleaning fluids can discolor or remove chrome plating.

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