The Masoneilan 28000 VariPak is the gold-standard micro-flow control valve for high-pressure additive and catalyst injection in refining and petrochemical processes. Rated to ANSI Class 1500 and equipped with field-replaceable trim sets (Cv 0.001–4.0), it delivers precise, repeatable injection even at extreme differential pressures. The rugged angle-body design with Stellite trim, optional multi-stage anti-cavitation cages, and bellows seal bonnet ensures long life and zero external leakage in the harshest FCCU, hydrocracker, and coker environments. Over 100,000 units installed worldwide in catalyst and chemical injection service.
| Parameter | Specification |
|---|---|
| Size | ¾" angle body |
| Pressure Rating | ANSI Class 900 / 1500 / 2500 special |
| Cv Range | 0.001 – 4.0 (10 interchangeable trims) |
| Temperature | -100°C to +550°C (with extensions) |
| Body Materials | 316L SST, Hastelloy C, Inconel |
| Trim Materials | 316 + Stellite, Alloy 6, Tungsten Carbide |
| Shutoff | ANSI Class VI (soft), Class V (metal) |
| Flow Characteristic | Linear or Modified % |
Yes — Stellite or tungsten carbide trim proven for decades.
Recommended for toxic or high-pressure services.
Replace plug and seat — no body removal needed.
Multi-stage Lo-dB trim eliminates cavitation completely.
For refinery injection applications:
