The ASAB S1 Piston Valve is a key sealing and control component in the ASAB S1 fluid section, responsible for regulating material flow through the pump and helping the unit build and hold pressure consistently. When the piston valve is in good condition, the sprayer primes faster, runs smoother, and maintains a more stable spray pattern under load.
If the machine is struggling to prime, pulsating, losing pressure, or creeping/fading while spraying, a worn or contaminated piston valve is a common cause. Replacing it is often the quickest way to bring back proper pump performance—without chasing your tail through every other part first.
Key features
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Supports reliable pressure build and hold in the S1 pump
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Helps reduce pressure fluctuation, pulsing, and prime issues linked to valve wear
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Restores consistent pump sealing when the original valve is worn, scored, leaking, or sticking
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Ideal during fluid-section servicing or when performance symptoms point to check/valve sealing
What’s included
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1 x S1 Piston Valve (service replacement)
Safety Check
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Relieve all fluid pressure before loosening any fluid-section components (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 handling.
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Injection hazard: never check for leaks with your hand; high-pressure fluid can penetrate skin.
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Test carefully after reassembly: prime at low pressure first, check for leaks and stable pressure, then return to normal operation.