Lift Plug Valves
SchuF is the inventor of the Lift Plug Valve – the first double block and bleed switch and/or isolation valve.
The original patent was received in 1914. Today, the Lift Plug Valve is widely used in the Chemical, Refinery (including Delayed Coking, Hydrocracking, and Visbreaking), Polymer, Cement, Power and Mining industries.
How a SchuF Lift Plug Valve works
See how the SchuF Lift Plug Valve works and how the valve can be flushed while the process is running.
Lift Plug Valve Applications
Its simple and rugged design makes it suitable for severe applications at high temperatures or with highly abrasive or erosive materials. In the Delayed Coking industry, the SchuF Lift Plug is utilised as a an isolation and switch valve. In visbreaking, cracking, hydroprocessing, distillation and deasphalting refinerary applications, the Lift Plug has proven to be an ideal isolation valve with many advantages over traditional ball valves and T-pieces.
This is due to the fact that the seals do not wear as the plug is lifted before turning.
In addition the valve has three lines of defence against sediment build up or fouling:
1. Flushing is initiated during plug lifting and turning.
2. An integral drain valve option enables sediment to be removed from the valve.
3. A retractable bottom plate that enables the valve to be cleaned in line in a very short period of time.
These three factors together make the SchuF Lift Plug ideal for dirty, sticky or clumping media at high temperatures.
Characteristics of SchuF Plug Valves
- Available with 2, 3 or 4 outlets
- Seat design ensures a perfect seal
- Seals are not worn during operation
- No dead spaces
- Integral block and bleed
- Available in high-temperature and pressure designs
- Electric, pneumatic, and hydraulic actuation available
- Straight or inverted plug, full or reduced bore, round or oval
- Individual design options (for example: 90° or 120° angle of departure)
- Top or bottom entry for easy maintenance