Part Code: ASAB-SDDP42-18
Introducing the ASAB DDP42 Thimble Spring — a precision spring component used within the DDP42 Double Diaphragm Pump to maintain correct tension and return force in the valve/seat assembly (depending on pump configuration). This spring plays a quiet but important role in ensuring components seat correctly, respond consistently, and maintain reliable sealing during continuous cycling.
A fatigued, corroded, or deformed thimble spring can contribute to issues like erratic cycling, inconsistent flow, poor valve seating, loss of prime stability, or reduced efficiency — especially if the pump has been running dirty product or has seen heavy duty cycles. Replacing the spring during a valve service or full rebuild helps restore proper internal response and reduces the chance of repeat issues caused by weak spring tension.
Whether you’re doing preventative maintenance, rebuilding the valve stack, or chasing a pump that’s started to behave inconsistently, the ASAB-SDDP42-18 is the right part to keep your DDP42 running smoothly and reliably.
Key Benefits
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Direct replacement thimble spring for ASAB DDP42
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Maintains correct tension/return force for consistent internal operation
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Helps support reliable valve seating and stable pump performance
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Ideal to replace during valve services and preventative maintenance
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Addresses issues linked to weak springs: inconsistent cycling, flow variation, prime instability
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Low-cost wear part that helps avoid bigger downtime repairs
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Workshop-ready spare for fast turnaround servicing
What’s Included
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DDP42 Thimble Spring — ASAB-SDDP42-18
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 disassembly.
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Chemical exposure: Wear gloves and eye protection — residual product can remain trapped in the fluid chambers/valve area.
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Spring tension hazard: Springs can pop during removal—control parts as you disassemble and keep your face clear.
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Keep parts clean and ordered: Dirt or swapped parts can cause immediate sealing/cycling issues; lay components out in sequence.
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Inspect related components: Check balls/seats, gaskets/O-rings, and sealing faces—don’t rely on a new spring to fix damaged hardware.
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Test gradually: Reassemble, then bring air pressure up slowly and confirm smooth cycling and leak-free operation before returning to full service.