Sandpiper Signature Series

Questions and Answers

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costakaylaAug 27, 2025
How to fix product leaking through the exhaust of my Sandpiper Signature?
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  tonyajonesAug 27, 2025
  If you notice product leaking through the exhaust of your Sandpiper Control Unit, it's likely due to diaphragm issues. This could be caused by diaphragm failure, or loose diaphragm plates, in which case you should replace the diaphragms and ensure the diaphragm plates are tight. Another potential cause is the diaphragm being stretched around the center hole or bolt holes. Check for excessive inlet pressure or air pressure and consult the Chemical Resistance Chart for compatibility with products, cleaners, temperature limitations, and lubrication.
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williamsandersAug 29, 2025
Why does my Sandpiper Control Unit pump cycle only once?
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  Sarah HammondAug 30, 2025
  Your Sandpiper Control Unit pump might cycle only once due to a few reasons. It could be deadheading (system pressure meets or exceeds air supply pressure); in this case, increase the inlet air pressure to the pump, noting that the pump is designed for a 1:1 pressure ratio at zero flow (this does not apply to high pressure 2:1 units). Alternatively, the air valve or intermediate gaskets may be installed incorrectly. Ensure you install the gaskets with holes properly aligned. Finally, a bent or missing actuator plunger could be the cause; remove the pilot valve and inspect the actuator plungers.
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Susan HuntAug 31, 2025
What to do if Sandpiper Signature pump cycles but won't prime?
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  Justin Green MDAug 31, 2025
  If your Sandpiper Control Unit pump cycles but won't prime or has no flow, check for a few potential issues. First, cavitation on the suction side could be the problem, so try moving the pump closer to the product. Second, an obstructed check valve could be preventing proper seating or causing sticking; disassemble the wet end of the pump to dislodge any obstructions in the check valve pocket and clean around the valve ball cage and seat area. Also, make sure the suction line isn't blocked by removing or flushing any obstructions and clearing all suction screens or strainers. If the suction lift is excessive (over 20 feet), priming the pump by filling the chambers with liquid may help. Finally, inspect all suction-side gaskets and pipe connections for air leakage or air in the product.
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Nathan BeckSep 4, 2025
Why is product leaking through the Sandpiper Signature Control Unit exhaust?
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  Kyle StokesSep 4, 2025
  If product is leaking through the exhaust of your Sandpiper Control Unit, it's likely due to a diaphragm failure or loose diaphragm plates. Replace the diaphragms, check for any damage, and ensure the diaphragm plates are tight. Another possibility is that the diaphragm is stretched around the center hole or bolt holes. Check for excessive inlet or air pressure, and consult the Chemical Resistance Chart to ensure compatibility with the products, cleaners, and temperature limitations, as well as proper lubrication.
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Karen WagnerSep 7, 2025
How to fix unbalanced cycling in Sandpiper Signature Control Unit?
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  Amber MurraySep 7, 2025
  Unbalanced cycling in your Sandpiper Control Unit can be caused by several factors. Excessive suction lift could be the issue; for lifts exceeding 20 feet of liquid, filling the chambers with liquid will prime the pump in most cases. An undersized suction line could also be the problem; ensure it meets or exceeds pump connection requirements. Additionally, an obstructed check valve might be the cause; disassemble the wet end of the pump and manually dislodge any obstruction in the check valve pocket. Inspect the check valves and seats for wear and proper setting, replacing them if necessary. Finally, entrained air or vapor lock in the chambers could be the culprit; purge the chambers through the tapped chamber vent plugs.
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dcastanedaSep 14, 2025
Why is product leaking through the exhaust of my Sandpiper Control Unit?
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  Maria PhamSep 14, 2025
  If you observe product leaking through the exhaust of your Sandpiper Control Unit, it could be due to diaphragm failure or loose diaphragm plates. Replace the diaphragms and ensure the diaphragm plates are tight. Another possibility is that the diaphragm is stretched around the center or bolt holes. Check for excessive inlet or air pressure and consult the Chemical Resistance Chart for compatibility with products, cleaners, temperature limitations, and lubrication.
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Lisa FergusonSep 16, 2025
Why does my Sandpiper Control Unit pump cycle once and then stop?
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  James HillSep 16, 2025
  If the Sandpiper Control Unit pump cycles only once, it could be due to several reasons. The system pressure may be meeting or exceeding the air supply pressure (deadhead). Increase the inlet air pressure to the pump. Ensure that the air valve or intermediate gaskets are installed correctly, with the holes properly aligned. Also, inspect the actuator plungers and remove the pilot valve if the actuator plunger is bent or missing.
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jholmesSep 18, 2025
What causes premature diaphragm failure in a Sandpiper Control Unit?
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  April FreemanSep 18, 2025
  Premature diaphragm failure in a Sandpiper Control Unit can stem from several causes. Cavitation can be a factor, so consider enlarging the pipe diameter on the suction side of the pump. Excessive flooded suction pressure can also contribute; try moving the pump closer to the product, raising the pump to reduce inlet pressure, or installing a back pressure device. Misapplication due to chemical or physical incompatibility is another potential cause, so consult the Chemical Resistance Chart for compatibility. Finally, incorrect, worn, or backward diaphragm plates can lead to premature failure. Refer to the Operating Manual to verify correct part usage and installation, and ensure the outer plates don't have sharp edges.
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Keith SmithNov 20, 2025
Why won't my Sandpiper Signature pump operate or cycle?
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  lynnleNov 20, 2025
  Your Sandpiper Control Unit pump may not operate or cycle due to several reasons. It might be over-lubricated—set the lubricator on the lowest possible setting or remove it, as these units are designed for lube-free operation. Check for a lack of air (insufficient line size, PSI, or CFM) by verifying the air line size and length, and the compressor capacity. Also, examine the air distribution system by disassembling and inspecting the main air distribution valve, pilot valve, and pilot valve actuators. Ensure the discharge line isn't blocked or the manifolds clogged; check for closed discharge line valves and clean the discharge manifolds/piping. Increase the inlet air pressure to the pump if it's deadheading (system pressure meets or exceeds air supply pressure). Remove, clean, or de-ice ...
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Jennifer WilsonNov 21, 2025
What to do if Sandpiper Signature Control Unit pump cycles but won't prime or has no flow?
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  jsmallNov 22, 2025
  If your Sandpiper Control Unit pump cycles but doesn't prime or has no flow, consider these possibilities: Check for cavitation on the suction side and move the pump closer to the product. Inspect for obstructions in the check valve; disassemble the wet end of the pump and manually dislodge any obstructions in the check valve pocket. Clean around the valve ball cage and valve seat area, and replace the valve ball or valve seat if damaged, potentially using a heavier valve ball material. Ensure valve balls aren't missing (pushed into the chamber or manifold) due to wear on the valve ball or valve seat, or worn fingers in the valve ball cage. Check if valve balls or seats are damaged or attacked by the product, consulting the Chemical Resistance Guide for compatibility. Inspect check valves ...