The S7/S8 Piston Valve is a primary sealing and flow-control component in the ASAB S7 and S8 fluid section. It plays a major role in how efficiently the pump moves material, builds pressure, and holds pressure during operation. When the piston valve is sealing correctly, the sprayer primes more reliably, runs smoother, and maintains consistent output under load.
If you’re seeing slow priming, pressure pulsing, fading pressure while spraying, or inconsistent performance, a worn, scored, sticking, or debris-affected piston valve is often the reason. Replacing it is a straightforward way to restore proper sealing and bring the pump back to stable, predictable operation.
Key features
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Supports dependable pressure build and hold in S7/S8 pumps
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Helps reduce pulsing, prime issues, and pressure drop linked to valve wear
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Ideal replacement when the valve is worn, scored, leaking, or sticking
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Suits ASAB S7 / S8 pump assemblies (configuration dependent)
What’s included
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1 x S7/S8 Piston Valve (service replacement)
Safety Check
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Relieve all fluid pressure before opening the fluid section (follow the sprayer’s pressure relief procedure).
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Isolate power (unplug/disconnect) before servicing the pump.
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Wear PPE: eye protection and chemical-resistant gloves—especially during flushing and solvent exposure.
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Injection hazard: never check for leaks with your hand; high-pressure fluid can penetrate skin.
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Restart carefully: prime at low pressure first, confirm stable pressure and no leaks, then return to normal operation.