The Keystone Figure 990 is a resilient seated, wafer-style butterfly valve with a split-body design. It features a thin-profile one-piece disc/stem that minimizes flow obstruction, delivering high flow capacity, low pressure drop, and excellent modulating performance. This valve is optimized for general industrial service where reliable bubble-tight shutoff and easy maintenance are important.
| Parameter | Value |
|---|---|
| Sizes | DN 25–500 (NPS 1–20) |
| Body Styles | Wafer (Figure 990) |
| Pressure Ratings | Up to 10 bar (150 psi) for DN 25–300 (NPS 1–12); 5 bar (75 psi) for DN 350–500 (NPS 14–20) |
| Seat Options | EPDM, NBR (Buna-N), PTFE, White NBR (food grade) |
| Disc/Stem Material | 316 Stainless Steel (standard) |
| Body Materials | Cast Iron, Ductile Iron, 316 Stainless Steel |
| Temperature Range | Up to 120°C (250°F) depending on seat material |
| Connections | Suitable for ASME 125/150 and PN 10/16 flanges |
Suitable for water treatment, HVAC, food and beverage, chemical processing, and general industrial pipelines requiring high flow capacity and reliable modulating or on/off service.
Q: What is the main benefit of the thin disc design?
A: It provides higher Cv values, lower pressure drops, and better modulating control.
Q: Can the seat be replaced in the line?
A: Yes, the split-body design allows easy replacement without removing the valve.
Q: Does it require flange gaskets?
A: No—the triple-function seat provides flange sealing.
Q: Is it suitable for food applications?
A: Yes, with food-grade White NBR or EPDM seats.
Q: What is the pressure rating for larger sizes?
A: 5 bar (75 psi) for DN 350–500.
Our team is ready to help with sizing, material selection, or actuator pairing. Reach out for your specific application needs.
Consider the Keystone Figure 920 lugged version for dead-end service, or pair with Keystone F79U pneumatic actuators for automated control.
The Keystone Figure 990 wafer butterfly valve features a split-body, thin-disc design engineered for high flow and modulating service. Its resilient seat and one-piece disc/stem construction deliver reliable bubble-tight shutoff and outstanding flow performance in a compact wafer body suitable for standard flange installations.
| Parameter | Value |
|---|---|
| Sizes | DN 25 to 500 (NPS 1" to 20") |
| Design | Wafer style, split body |
| Pressure Rating | 10 bar (150 psi) for sizes up to DN 300 (NPS 12"); 5 bar (75 psi) for DN 350–500 (NPS 14–20") |
| Seat Materials | EPDM, Buna-N (NBR), PTFE, White NBR |
| Disc/Stem | 316 Stainless Steel standard |
| Body Materials | Cast Iron, Ductile Iron, 316 Stainless Steel |
| Flange Standards | ASME 125/150, PN10, PN16 |
| Temperature | Dependent on seat material, typically up to 120°C |
Ideal for HVAC systems, water distribution, wastewater treatment, light chemical service, food processing, and other general industrial applications requiring cost-effective, high-flow butterfly valves with good modulating capability.
Q: Is the Figure 990 suitable for dead-end service?
A: No, it is a wafer style and not recommended for dead-end service (use Figure 920 lugged for that).
Q: How is maintenance performed?
A: The split-body design allows seat and disc/stem replacement without taking the valve out of the pipeline.
Q: What seat options are available?
A: EPDM, NBR, food-grade White NBR, and PTFE for different media and temperature needs.
Q: What actuators can be used?
A: Compatible with direct-mount Keystone pneumatic and electric actuators.
Q: What is the maximum temperature?
A: Up to 120°C (250°F), depending on the seat material selected.
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