XOMOX Tufline Low Emission HF4D Sleeved Plug Valve
A dedicated plug valve for hydrofluoric acid alkylation and derivatives service, built around leak detection and zero packing adjustments.
The XOMOX Low Emission HF4D is a soft-seated sleeved plug valve for hydrofluoric acid alkylation service, 1/2 to 12 inches, Class 300, -20°F to 500°F. Crane CPE describes it as the first soft-seated sleeved plug valve meeting ISO 15848-1 and API 641 with zero packing adjustments during thermal cycling, with a fourth sealing barrier and optional HF detection paint.
HF4D at a glance
| Valve type | Soft-seated sleeved plug valve (Tufline/Tuflin family) |
|---|---|
| Size | 1/2 in to 12 in |
| Pressure class | Class 300 |
| Temperature | -20°F to 500°F |
| Body materials | M35-1 alloy, carbon steel |
| Emissions standards | ISO 15848-1 and API 641, with zero packing adjustments during thermal cycling |
| Sealing | Fourth sealing barrier (4D stem packing) |
| Leak detection | HF detection paint option |
| Named service | HF alkylation and HF derivatives |
Source: Crane ChemPharma & Energy — XOMOX Tufline/Tuflin Sleeved Plug Valves
Why the extra barrier and the detection paint
Hydrofluoric acid alkylation units cycle temperature regularly, and a plug valve that needs repacking on every cycle is both a maintenance burden and a safety liability. The HF4D's fourth sealing barrier and its HF detection paint option exist because an undetected HF leak is a serious safety event. They are leak-detection features specific to HF alkylation service, not generic accessories.
How the HF4D compares with the other Tufline low-emission valves
| Model | Size | Class | Temperature | Standards and service |
|---|---|---|---|---|
| Low Emission HF4D | 1/2–12 in | Class 300 | -20 to 500°F | ISO 15848-1 and API 641; HF alkylation and derivatives |
| Tertiary Top Seal (hydrofluoric) | 1/2–12 in | Class 300/600 DR | -20 to 600°F | EPA Method 21 and API 607; listed by UOP and ConocoPhillips for HF alkylation units |
| 3D (Low Emission) | 1/2–16 in | Class 150/300, PN63 | -20 to 600°F | ISO 15848-1 |
| SR (Severe Service) | 1/2–12 in | Class 150/300 | -20 to 500°F | API 641; names sulfuric acid alkylation, zero packing adjustments across 3 thermal cycles |
| XP3 | 1/2–12 in | Class 150/300 | -20 to 392°F | ISO 15848-1; chlorine, caustic soda, vinyl chloride, TDI/MDI, ethylene oxide |
| SSV (Severe Service) | 1/2–16 in | Class 150/300/600 | -20 to 600°F | EPA Method 21 |
| FE0 | 1/2–16 in | PN10–40, Class 150/300 | -148 to 572°F | Certified below 20 ppm (AH class), triple sealing system |
Source: Crane ChemPharma & Energy — XOMOX Tufline/Tuflin Sleeved Plug Valves
Ordering
Tell James the service (HF alkylation, HF derivatives or another toxic-gas duty), the size and class, and the operator you need (bare stem, gear or actuator). We confirm availability and options with the manufacturer before you order.
Frequently Asked Questions
What is the XOMOX Low Emission HF4D plug valve?
It is a soft-seated sleeved plug valve from Crane CPE (XOMOX) for HF alkylation and HF derivatives service, in 1/2 to 12 inch sizes, Class 300, rated -20°F to 500°F. Crane CPE describes it as the first soft-seated sleeved plug valve to meet both ISO 15848-1 and API 641 with zero packing adjustments during thermal cycling.
What does the HF4D fourth sealing barrier and HF detection paint do?
The fourth barrier is a 4D stem packing, and the optional HF detection paint shows a leak. Both exist because an undetected hydrofluoric acid leak is a serious safety event, so they are leak-detection and containment features specific to HF service.
What is the difference between the HF4D and the Tertiary Top Seal?
Both are dedicated HF-service plug valves in 1/2 to 12 inch sizes. The HF4D is Class 300 to 500°F. The Tertiary Top Seal is Class 300 and 600 DR to 600°F, is EPA Method 21 and API 607 certified, and its design is listed by UOP and ConocoPhillips for HF alkylation units.
Which XOMOX plug valve is for sulfuric acid alkylation?
Crane CPE names the SR (Severe Service) valve for sulfuric acid alkylation. It meets API 641 with zero packing adjustments across three thermal cycles. The HF4D is the valve it names for HF alkylation.
Related
Send James your spec
Fluid, concentration, temperature, flow or volume, and where it goes. James replies with a real answer, not a catalog page.
Reviewed by James Riggins, 30+ years specifying water and chemical process equipment · Updated