The Masoneilan 28000 VariPak is the industry-standard micro-flow control valve specifically engineered for precise regulation of extremely low flows in laboratory, pilot plant, and research applications. With ten interchangeable plug-and-seat trim sets covering Cv from 0.001 to 4.0 and a field-adjustable 10:1 turndown, it offers unmatched flexibility without changing the valve body. The compact ¾" angle body with ANSI 900/1500# end connections and heavy-duty bellows or graphite packing ensures ANSI Class VI shutoff even at high pressures. Trusted for over 50 years in catalyst injection, dosing, and sampling systems worldwide.
| Parameter | Specification |
|---|---|
| Size | ¾" (DN20) angle body |
| Cv Range | 0.001, 0.004, 0.010, 0.025, 0.06, 0.10, 0.25, 0.60, 1.7, 4.0 |
| Pressure Rating | ANSI Class 900 / 1500 (up to 255 bar) |
| End Connections | NPT, Socket Weld, Butt Weld, Flanged |
| Temperature Range | -100°C to +400°C |
| Body Material | 316L SST, Hastelloy C, Monel |
| Shutoff Class | ANSI Class VI (soft seat), Class V (metal) |
| Flow Characteristic | Linear (standard), Equal % option |
| Leakage | less than 0.0001 ml/min (bellows) |
Yes — simply replace the plug and seat trim in minutes.
0.001 (1*10⁻³) — ideal for µl/min flows.
Yes with optional bellows seal bonnet.
Yes — multi-stage Lo-dB trim available.
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