The ASCO 8221 Series (also called Series 221) offers pilot‑operated, slow‑closing solenoid valves designed to prevent water hammer in plumbing and industrial systems. These brass‑body valves include a built‑in snubber disc that slows the closing action—protecting pipes and equipment from pressure spikes while accommodating both hot and cold water service.
A built‑in snubber reduces the valve’s closing speed, significantly cutting water hammer pressure surges—often eliminating the need for external suppressors.
This series covers NPT sizes from ⅜″ to 2½″, with Cv values from roughly 3 up to around 38—providing flexible flow control for a wide range of plumbing needs.
Yes. ASCO offers both normally‑open and normally‑closed configurations, suitable for safety shutoff or normally‑on applications.
Coils are available in AC (24–480 VAC) or DC (6–240 VDC), housed in watertight RedHat II enclosures. Explosion‑proof options are also offered.
The 8221 handles water up to 180 °F (or 210 °F for hot‑water variants), with pressure ratings from 5 to 150 psi—ideal for HVAC, laundry, sterilizer, and industrial applications.
Yes—thanks to the pilot‑operated design, these valves can be mounted horizontally, vertically, or inverted without losing performance.
Fill in the form below, or call us now at 1-800-755-2883
"*" indicates required fields
