Differential pressure controller

Differential pressure controller - is a regulating pipeline fitting designed to automatically maintain a set water pressure difference at impulse pick-up points.

Constant pressure difference maintenance is achieved by adjusting the valve passage area. Depending on the reaction to pressure difference changes, controllers are classified as either closing or opening when the pressure difference increases.

The operating principle of a direct-acting controller is based on using water energy to control the valve without external power. The valve opening degree is proportional to the deviation of the pressure difference from the set value.

Application

Differential pressure controllers are widely used in heating systems with dynamic hydraulic modes. They help stabilize pressure at heating network inlets, create optimal conditions for control valves, balance heating systems, and protect equipment from zero heat carrier flow through bypass. For more details, see the application schemes section.

Advantages

• Easy setup
• High pressure maintenance accuracy
• Reliable and serviceable design
• No maintenance required
• No external power source needed

Disadvantages

• High cost
• Complex design
• High requirements for heat carrier quality
• Adjustment range limited by spring compression strength

Alternative Names

• Excess pressure regulator
• Automatic balancing valve

Possible Replacements

• Bypass valve, which maintains the pressure difference between the inlet and outlet ports, replaces a differential pressure controller that opens with an increase in pressure difference.


• An indirect-acting differential pressure controller can replace both closing and opening types as the pressure difference increases. However, due to high costs, they are only installed in exceptional cases. An indirect-acting controller consists of two pressure sensors, a control valve, an electric actuator, and a control controller.