Oil-Hydrogen Differential Pressure Regulating Valve Overview:

Hydrogen-hydrocarbon differential pressure regulating valve is used for the sealing oil system of power generation sets. It compares the sum of hydrogen pressure and spring pressure with oil pressure. When a pressure difference occurs, the valve stem moves up and down, thereby affecting the valve opening.

The differential pressure valve adjusts the outlet flow and pressure accordingly, achieving pressure balance. Meanwhile, the pressure difference ΔP between hydrogen and oil pressure remains relatively constant. The differential pressure value ΔP can be adjusted by regulating the spring.

Oil-Hydrogen Differential Pressure Regulating Valve - Working Principle:

The pressure differential valve consists of an actuator and the valve body.

Closed-center differential pressure valve (KC type), the valve core is in a closed position (i.e., when no medium is input or the pressure difference between the lower end of the actuator and the upper end is less than the spring pre-tension force). Under operation...

When the difference between the lower and upper pressure of the structure exceeds the spring preload, the valve is in the open position.

The BC type Normally Open Pressure Differential Valve is in the open position at its initial state. It closes when the pressure difference between the bottom and top of the actuator exceeds the spring preload force.

Oil-Hydrogen Differential Pressure Regulating Valve  Installation:

The pressure differential valve, when used in the sealing oil system of a hydrogen-cooled power generation unit, operates with turbine oil as the working medium at a temperature of ≤70°C. The main pressure differential valve is vertically installed on the horizontal pipelines at both ends of the bypass side oil, while the standby pressure differential valve is provided.

Also vertically mounted on the horizontal pipeline of the series-connected high-pressure auxiliary oil circuit. The direction of medium flow must be consistent with the arrow indicated on the differential pressure valve.

Oil-hydrogen differential pressure regulating valve Adjustment:

The set differential pressure value is adjusted by turning the adjusting screw; counterclockwise rotation increases the differential pressure; clockwise rotation decreases the differential pressure.