

Part number 800-243 is an Outlet Seat Valve that controls the discharge of pressurized material from the pump on compatible 740, 840, 1140, Performer, and PowrTex series sprayer systems. This complete check valve assembly ensures proper fluid flow and pressure maintenance during operation.
| Part Number | 800-243 |
|---|---|
| Part Description | Outlet Seat Valve |
| Fits | 740 i Airless Sprayer; 740 IX; 740 ix Airless Sprayer; 840 i Airless Sprayer; 840 IX; 840 ix Airless Sprayer; 840i Airless Sprayer; 1140 i; 1140 ix Airless Sprayer; 1140 IX; Performer 1140 ix; PowrTex 1200SF |
| Condition | New |
Part number 800-243 is an Outlet Seat Valve specifically engineered for use across a comprehensive range of professional sprayer systems including 740 i Airless Sprayer, 740 IX, 740 ix Airless Sprayer, 840 i Airless Sprayer, 840 IX, 840 ix Airless Sprayer, 840i Airless Sprayer, 1140 i, 1140 ix Airless Sprayer, 1140 IX, Performer 1140 ix, and PowrTex 1200SF. These professional units include airless sprayers and texture sprayers for residential, commercial, and industrial applications. This outlet seat valve is a critical component of the pump's fluid section, controlling the discharge of pressurized material from the pump chamber to the spray hose. It functions as a one-way check valve, opening on the pressure stroke to allow material to flow to the gun and closing on the suction stroke to prevent backflow into the pump.
The outlet seat valve assembly includes the precision-machined seat and the valve mechanism. The seat provides a precision sealing surface against which the valve closes, creating a positive shut-off. This assembly is subjected to continuous high-pressure cycling and abrasive wear from pigmented coatings. Over time, the seat can become pitted or worn, compromising the valve's ability to seal properly.
A worn or damaged outlet seat valve causes symptoms similar to worn pump packings: the pump will prime successfully but will not build or maintain full operating pressure. Debris stuck in the valve can also prevent proper seating, causing pressure loss and erratic performance. Replacement with genuine 800-243 outlet seat valve restores proper check valve function, eliminates pressure loss due to backflow, and ensures reliable performance for professional painting applications. This assembly is a complete, ready-to-install unit.
| One-Way Flow Control | Allows material out during pressure stroke; prevents backflow during suction stroke |
|---|---|
| Pressure Maintenance | Critical component for building and holding operating pressure |
| System Integrity | Ensures proper fluid direction for consistent spray performance |
| Pressure Loss | Pump primes but will not build or maintain full operating pressure |
|---|---|
| Internal Wear | Valve components worn from normal service; symptoms similar to worn packings |
| Disassembly Damage | Valve has been taken apart and parts are lost or damaged; no individual service parts available |
| Debris Contamination | Embedded debris prevents proper sealing, cannot be cleaned |
Part number 800-243 is specifically designed for a comprehensive range of professional sprayer systems including 740 i Airless Sprayer, 740 IX, 740 ix Airless Sprayer, 840 i Airless Sprayer, 840 IX, 840 ix Airless Sprayer, 840i Airless Sprayer, 1140 i, 1140 ix Airless Sprayer, 1140 IX, Performer 1140 ix, and PowrTex 1200SF. These professional units include airless sprayers and texture sprayers for residential, commercial, and industrial applications. This outlet seat valve is a universal component engineered for the fluid section requirements across these diverse professional platforms. Always confirm fitment using the correct parts diagram for your exact model and serial number.
| Compatible Models | Component |
|---|---|
| 740 i Airless Sprayer | Outlet Seat Valve |
| 740 IX | |
| 740 ix Airless Sprayer | |
| 840 i Airless Sprayer | |
| 840 IX | |
| 840 ix Airless Sprayer | |
| 840i Airless Sprayer | |
| 1140 i | |
| 1140 ix Airless Sprayer | |
| 1140 IX | |
| Performer 1140 ix | |
| PowrTex 1200SF |
The outlet seat valve is a critical component of the pump fluid section. When servicing this component, these related parts are often inspected or replaced at the same time.
The inlet check valve works in tandem with the outlet valve. Inspect both during fluid section service.
Outlet valve failure symptoms mimic worn packings. Replace packings simultaneously when diagnosing pressure loss.
Seal between valve assembly and pump housing. Replace if damaged during valve service.