The patented diaphragm pressure reducing valve employs a piston or pilot-operated structure, adjusting the set pressure via spring compression, and possesses dual functions of reducing dynamic and static pressure. Standard nominal pressures range from 0.6 to 16.0 MPa, and valve body materials include stainless steel, cast iron, and copper alloys to suit various media requirements. During installation, a filter is required, and the valve body direction must be aligned with the fluid flow direction. For fire protection systems, additional drainage facilities are necessary, and for hot water systems, measures must be taken to prevent circulating pressure imbalance. Depending on the pipe diameter, a straight-line structure is used for pipes under 50mm, while a pilot-operated design is recommended for pipes between 50-100mm. In high-rise buildings, a parallel configuration with varying pipe diameters can be used to maintain pressure stability.
Working Principle
Pressure Sensing and Feedback
The valve senses the inlet pressure through built-in springs, diaphragms, or pistons, and adjusts the spring preload or valve core opening via a regulating mechanism (such as a handwheel or screw).
Dynamic Balancing
When the inlet pressure changes, the valve core automatically adjusts its position, changing the fluid passage area to maintain a stable outlet pressure. For example:
When the inlet pressure increases, the valve core moves downward, narrowing the outlet passage and reducing the pressure;
When the inlet pressure decreases, the valve core moves upward, widening the outlet passage and maintaining the pressure.
Features
Adjustability
The outlet pressure can be manually set via an external knob or handle to adapt to different operating conditions (e.g., adjustable from 0.1MPa to 6MPa).
High-Precision Control
Utilizing a precision spring or hydraulic feedback system, pressure fluctuations are typically controlled within ±5%.
Automatic Pressure Stabilization
No continuous manual intervention is required; it responds in real-time to changes in inlet pressure, maintaining a constant outlet pressure.
Structural Diversity
Common types include:
Direct-acting: Relies on a spring and diaphragm to directly balance pressure; suitable for low-pressure applications (e.g., domestic gas).
Pilot-operated: Controls the main valve via a pilot valve; suitable for high-pressure or high-flow applications (e.g., industrial pipelines).
Applications
Civilian Sector
Gas Systems: Regulates the inlet pressure of gas stoves and water heaters to prevent unstable flames or equipment damage.
Water Supply Systems: Controls water pressure in high-rise buildings to prevent water hammer or pipe rupture.
Industrial Sector
Steam Pipelines: Stabilizes steam pressure to ensure the efficiency of heating equipment.
Hydraulic Systems: Protects precision components (such as hydraulic cylinders) from high-pressure impacts.
Chemical Processes: Maintains stable pressure within reaction vessels to ensure production safety.
Special Scenarios
Fire Protection Systems: Ensure sprinkler heads operate at set pressures.
Laboratory Equipment: Provide a stable gas or liquid supply for precision instruments.