Part Code: ASAB-SDDP18-4
Introducing the ASAB DDP18 Upper Ball Seat — a critical check-valve sealing component used in the DDP18 Double Diaphragm Pump to ensure the upper check ball seals correctly on each stroke. The ball seat is what gives the check valve its “one-way door” function: it helps prevent backflow, supports stable prime, and keeps flow consistent under cycling load.
When an upper ball seat is worn, scored, cracked, or packed with debris, you’ll typically see symptoms like loss of prime, reduced flow, pulsing/surging, product creeping back down the suction line, or poor lift performance. Replacing the seat (often along with the ball if it’s marked) restores proper sealing at the valve and brings the pump back to clean, efficient operation.
Whether you’re doing a wet-end service, rebuilding the valve stack, or chasing prime issues that won’t go away, the ASAB-SDDP18-4 is the right part to keep your DDP18 check valve sealing properly.
Key Benefits
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Direct replacement upper ball seat for ASAB DDP18
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Restores proper check valve sealing to prevent backflow
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Helps fix common symptoms: prime loss, pulsing, reduced flow, poor lift
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Supports stable priming and consistent delivery under load
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Ideal to replace during valve services / wet-end rebuilds
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Reduces repeat issues caused by scored or deformed sealing faces
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Workshop-ready spare for fast turnaround repairs
What’s Included
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DDP18 Upper Ball Seat — ASAB-SDDP18-4
Safety Check
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Isolate and depressurise first: Shut off air supply, bleed the airline fully, and confirm the pump is not pressurised before opening the wet end.
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Chemical exposure: Wear gloves and eye protection — product can remain trapped in valve chambers.
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Keep parts clean: Dirt on the seat face will cause instant sealing issues — clean the valve cavity and seat area before refit.
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Inspect the ball as well: If the ball is scored, swollen, or out-of-round, replace it too — a new seat won’t fix a damaged ball.
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Even reassembly: Tighten fasteners in a cross pattern to avoid warping valve parts and creating leak paths.
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Test gradually: Bring air pressure up slowly, prime at low pressure first, and confirm smooth cycling and consistent flow before returning to full operation.