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Difference between PDV safety valve and PPV safety valve
Release Date:
2025-07-31
The PDV safety valve achieves high-precision pressure relief through pilot control, suitable for ultra-high-pressure precision scenarios; the PPV safety valve uses spring direct loading as its core, meeting the economic requirements of conventional industrial systems.
The core differences between PDV safety valves (pilot-operated safety valves) and PPV safety valves (pressure protection valves) mainly lie in structural principles, control accuracy, and application scenarios. The specific comparison is as follows:
Differences in Structural Principles
PDV Safety Valve (Pilot-Operated Safety Valve)
Adopts a dual-stage structure of main valve + pilot valve:
The pilot valve senses system pressure and controls the main valve operation through pulse signals;
The main valve opening/closing is driven by external air source or medium pressure, with faster response speed and better sealing.
Suitable for high-pressure, large-diameter, or scenarios requiring precise pressure relief control.
PPV Safety Valve (Pressure Protection Valve)
Usually belongs to direct load safety valves (such as spring type):
Relies on the direct opposition between spring preload and medium pressure to achieve opening and closing;
Simple structure, no external control circuit, and low maintenance cost.
Mostly used in medium-low pressure, small-diameter, or systems with low response accuracy requirements.
Typical Application Scenarios
PDV Safety Valve:
Key systems with extreme high pressure and zero leakage requirements, such as primary loops of nuclear power plants, supercritical boilers, and large chemical reactors.
PPV Safety Valve:
Medium-low pressure industrial scenarios such as conventional pressure vessels, steam pipelines, and compressed air systems, emphasizing economy and reliability.
Special Design Comparison
PDV Safety Valve:
Can be equipped with remote control systems to achieve online adjustment of pressure setpoints; some designs include backpressure disc structures to improve opening stability.
PPV Safety Valve:
Simplified structure (such as single spring design), usually without external dependencies, suitable for flammable and explosive environments.
PDV safety valves achieve high-precision pressure relief through pilot control, suitable for ultra-high pressure precision scenarios; PPV safety valves focus on spring direct load, meeting the economic needs of conventional industrial systems. Specific selection should comprehensively evaluate pressure levels, medium characteristics, and safety standards (such as ASME certification).
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