Industrial valves · Клапан селекторный Schuf
SchuF ARV Valves for Pump Protection: Technical Characteristics and Application
Automatic Recirculation Valves (ARV) SchuF: Engineering Review and Specifications
SchuF Automatic Recirculation Valves are precision devices designed to ensure the minimum required flow in centrifugal pumps. The key function of these valves is to protect pump equipment from cavitation, overheating, and unstable operation at low loads. The integration of SchuF valves from EV Group China helps prevent risks associated with "dry running" and hydraulic shocks, which is critically important for extending the service life and increasing the inter-repair interval of the equipment.
Key Advantages and Design Features
- Prevention of Thermal Overloads: The valve modulates the bypass flow, maintaining a stable temperature balance of the pump when operating at minimum capacity, thereby preventing overheating.
- Increased Operational Reliability: The design of SchuF ARVs effectively dampens vibrational loads, significantly increasing the lifespan of the pump unit and associated pipeline elements.
- Operation in Extreme Conditions: The valves are designed for integration into systems with high temperatures and pressures, which is standard for the energy and oil refining industries.
- Maintenance Optimization: The modular architecture of SchuF valves, supplied by EV Group China, provides simplified access to internal components for inspection and routine service.
- Minimization of Erosive Wear: The automation of the recirculation process eliminates the human factor and ensures the stability of hydraulic parameters, preventing premature wear of the flow path.
The valve's operating principle is based on automatic tracking of flow changes in the main line. When the flow drops below a predetermined level, the valve opens the bypass line, redirecting part of the medium back to the pump inlet and maintaining its safe operation. Depending on the requirements of the technological process, the devices can be equipped with pneumatic, electric, or hydraulic actuators.
| Characteristic | Working Pressure | Working Temperature | Materials of Construction | Actuator Types | Purpose |
|---|---|---|---|---|---|
| Value | up to #2500 | up to 450°C | Stainless steel, carbon steel, special alloys | Pneumatic, electric, hydraulic | Pump protection, bypassing, flow regulation |
Areas of Industrial Application
SchuF recirculation valves demonstrate high efficiency in the following critical industries:
- Oil & Gas Processing and Chemicals: Ensuring stability of hydraulic regimes during pumping of corrosive and volatile media, protecting high-pressure pumps.
- Energy: Maintaining circulation in boiler feed circuits, turbine cooling systems, and heat exchange equipment to prevent flow disruptions.
- Chemical Production: Precise control of minimum flow in reactor circuits and processes requiring accurate dosing, for example, in catalytic cracking and hydrotreating.
- Gas Industry: Protection of compressor and booster stations from surging by maintaining a constant bypass flow.
Material Execution and Operational Parameters
EV Group China supplies SchuF valves made from high-strength grades of stainless and carbon steel, as well as special alloys resistant to corrosion and erosion. The devices are designed for operation at temperatures up to 450°C and pressure class #2500. Limitations: The use of valves at temperatures below -20°C or in media with a high content of solid abrasive particles requires prior technical consultation with EV Group China engineers and the selection of specialized wear-resistant coatings.