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ASCO 8290B10 Piston Valve

ASCO 8290B10 Piston Valve

ASCO

The ASCO 8290B10 Piston Valve, catalogued by ASCO as 8290B010, is a 2-way, normally closed, pilot-operated angle-body piston valve with a 1-inch NPT bronze body, a PTFE (Teflon) disc seal and a 63 mm piston operator. It belongs to the ASCO Series 8290 line, which current Emerson literature lists as Series 290, and it is built for on-off control of air, inert gas, water, oil, light slurries, hot water and steam. Techs often search for it as an ASCO solenoid valve because a solenoid pilot valve normally supplies its pilot pressure, but the 8290B010 itself has no coil: pilot pressure drives the piston, the stem lifts the disc off the seat, and the valve closes on its own when pilot pressure is removed.

ASCO's catalog lists the 8290B010 with a 1-inch orifice, a 19 Cv flow coefficient, a 60 to 150 psi air or water pilot pressure range, a minimum operating pressure differential of 0 psi and a maximum of 150 psi on both fluids and steam. Maximum fluid temperature is 366°F, ambient and pilot-fluid temperatures run 15°F to 140°F, and the maximum viscosity is 2,700 SSU. This is an entry-under-the-disc construction, so line pressure is piped to Port 2, and the fluid closing the disc from underneath slows the final movement, which helps limit water hammer. The wetted parts are a bronze body, brass disc and stuffing box, a 431 stainless steel stem, PTFE chevron stem packing and an FKM wiper seal. The piston operator rotates 360° to position the 1/8-inch NPT pilot port, and a visual position indicator is standard on the 63 mm operator.

Do not substitute by pipe size alone, because the 1-inch size comes in several constructions. 8290B053 is the stainless steel body version of this normally closed valve, 8290B028 is the normally open bronze version, 8290B038 is the entry-above-the-disc construction for rapid-cycling steam, 8290B011 moves up to a 90 mm operator with a 240 psi fluid differential rating, and 8290A386 uses a 50 mm operator rated to only 90 psi.

For installation, ASCO's bulletin calls for a strainer or filter on the inlet side as close to the valve as practical, pipe compound on the male threads only and sparingly, and wrenches on the body or piping rather than the operator head. The valve works in any mounting position, and the factory exhaust port plug must stay in place. When a valve is slow, noisy or fails to open, check the pilot supply first, since the minimum pilot pressure rises with line differential. A valve that leaks past the seat usually has debris or a worn disc seal, and the repair can be done in line without removing the body, using the ASCO rebuild kit number stamped on the nameplate (the service bulletin lists C131206 for 1-inch bronze valves). On a normally closed valve, pressurize the operator before unscrewing the stuffing box and keep it pressurized during reassembly, and always depressurize and vent the main and pilot lines first.

Key Benefits

  • Fail-Closed Shutoff: The normally closed design closes when pilot pressure is lost, and the PTFE disc seal provides bubble-tight shutoff on compatible media.
  • High Flow Capacity: The angle-body flow path delivers 19 Cv through a 1-inch NPT connection with a 1-inch orifice.
  • Wide Media Range: Handles air, water, oil, hot water and steam up to 366°F with a 150 psi maximum differential.
  • Serviceable In Line: The rebuild kit repair needs no pipe removal, and the 360° rotating piston operator makes pilot valve piping easy to align.

Common Questions

  • Is the 8290B10 a solenoid valve? Not by itself. The 8290B10 is a pilot-operated piston valve with no coil, and ASCO offers 3-way direct-acting normally closed pilot valves for it, including the direct-mount Series 189 and the in-line Series 8320, selected separately for coil voltage.
  • What is the difference between 8290B10 and 8290B010? The 8290B10 designation is a shorthand used for 8290B010, the ASCO catalog number for this 1-inch, 63 mm, normally closed bronze valve, so both numbers describe the same valve.
  • What should be checked before replacing one? Confirm the catalog number on the nameplate, the 1-inch NPT connection, normally closed operation, Port 2 flow direction, a differential at or below 150 psi, fluid at or below 366°F and a filtered 60 to 150 psi pilot supply.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.